WO2000028608A1 - Lithium secondary cell - Google Patents
Lithium secondary cell Download PDFInfo
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- WO2000028608A1 WO2000028608A1 PCT/JP1999/006219 JP9906219W WO0028608A1 WO 2000028608 A1 WO2000028608 A1 WO 2000028608A1 JP 9906219 W JP9906219 W JP 9906219W WO 0028608 A1 WO0028608 A1 WO 0028608A1
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- Prior art keywords
- lithium
- solid electrolyte
- secondary battery
- lithium secondary
- inorganic solid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/582—Halogenides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a lithium secondary battery using a solid electrolyte and a halide having a spinel structure or a spinel-like structure as an active material.
- lithium batteries lithium has a small atomic weight and a large ionization energy, and as such, has been actively studied in various fields as a battery that can obtain a high energy density.
- a mixed conductor having both lithium ion conductivity and electron conductivity is preferably used as the active material of the lithium battery.
- As one of such mixed conductors of lithium ion and one electron there are various compounds having a spinel structure.
- the compound having a spinel structure has a three-dimensional diffusion path of lithium ions, and has a preferable structure for the movement of lithium ions.
- L i C o 0 2 being used as the positive electrode active material for lithium secondary batteries, lithium between layers C o O 2 to form It has a two-dimensional structure in which ions exist. When the amount of lithium ions between the layers changes, the distance between the layers changes greatly.
- the spinel-type structure has a three-dimensional skeleton, and when used as an active material of a battery, it is possible to suppress such a volume change due to charge and discharge.
- halides such as chloride and bromide have been reported as lithium-containing compounds having a similar spinel structure.
- L i 2 M n C 14 CJJ van Loon and J. de Jong, Acta Crystal 1 og raphica B, 24, 1968 (1982)
- L i 2 Fe C 1. kanno Y. Takeda, A. Takahash i , 0. Yamamoto, R. Suyama, and S.Kume, Journal of Sol id State Chemistry, 72, 363 (1988)
- L i 2 C r C 1 4 R. Kanno, Y. Ta keda, A. Matsumoto, 0.Yamamoto, R. Suyama, S.
- an object of the present invention is to provide a lithium secondary battery using a lithium-containing halide having a spinel structure or a spinel-like structure.
- the present invention relates to a lithium secondary battery comprising a chargeable / dischargeable positive electrode, a chargeable / dischargeable negative electrode and a lithium ion conductive inorganic solid electrolyte, wherein at least one of the positive electrode and the negative electrode has a spinel structure or a spinel-like structure.
- the present invention relates to a lithium secondary battery comprising a lithium-containing halide having a mold structure.
- the lithium-containing halide has the formula: Li 2 -2P- . M e 1 + P X 4 (M e is at least one transition metal element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, and Cu; X is at least one halogen element selected from the group consisting of F, Cl, Br and I, represented by 0 ⁇ p ⁇ 0.5, 0 ⁇ q ⁇ 2-2p) Is preferred.
- the lithium-containing halide is represented by Li 2 Me X 4 , and Me is more preferably Fe, Mn, or Co.
- the lithium ion conductive inorganic solid electrolyte is preferably a sulfide-based lithium ion conductive inorganic solid electrolyte.
- the lithium ion conductive inorganic solid electrolyte is a sulfide-based lithium ion conductive inorganic solid electrolyte containing silicon, and preferably contains oxygen in an amount of 5 to 70 mol% with respect to silicon.
- FIG. 1 is a sectional view of a lithium secondary battery according to one embodiment of the present invention.
- FIG. 2 is a charge / discharge curve diagram of the lithium secondary battery according to one embodiment of the present invention.
- FIG. 3 is a cross-sectional view of a lithium secondary battery according to a comparative example of the present invention.
- the present invention is a lithium secondary battery including a lithium ion conductive inorganic solid electrolyte and an electrode having a spinel structure or a spinel-like structure having a lithium-containing halide as an active material.
- inorganic solid electrolytes only a single ionic species conducts. That is, only lithium ions move in the lithium ion conductive inorganic solid electrolyte. Therefore, even when a lithium-containing halogenide having a high ionic bond is used as the active material, the structure of the halide is maintained and a rechargeable lithium battery can be manufactured.
- an organic solvent electrolyte used in a normal lithium battery or a polymer solid electrolyte even if it is a solid electrolyte does not have such ion selectivity.
- a solid polymer electrolyte when used, the dissolution of the halide hardly occurs just by contacting the active material with the lithium-containing halide.
- the halide ions also move through the electrolyte, and as a result, the structure of the lithium-containing halide cannot be maintained. That is, it is difficult to manufacture a rechargeable lithium secondary battery.
- lithium-containing halide in the present invention those having a spinel structure or a spinel-like structure excellent in lithium ion diffusion are preferable, and tetragonal crystals having a high lithium ion transfer rate are particularly preferable.
- the spinel-type lithium-containing halide according to the present invention is, for example,
- the spinel structure includes an inverse spinel structure.
- the spinel-like structure refers to a skeleton of the spinel structure represented by ⁇ 2 ⁇ 4 in which the element ⁇ or a part of the element ⁇ ⁇ is missing, or the site of the element A is partially removed. Is a structure in which part of is replaced with element B.
- X is a halogen ion
- A is a center position of a tetrahedron having a halogen ion as a vertex
- B is a center position of an octahedron having a halogen ion as a vertex.
- A is mainly composed of lithium ions
- B is composed of lithium ions and transition metal elements.
- the transition metal element occupying B a transition metal element that is liable to change in the valence accompanying charge / discharge of the battery is preferable.
- T i, V, Cr, Mn, Fe, C o, N i , Cu and others are preferred.
- Examples of spinel-type lithium-containing halides include, for example,
- L i 2 F e C 14 (A occupies L i, B occupies a 1: 1 molar ratio of L i and F e), L i 2 C r C l 4 , L i 2 VC l 4, L i 2 T i C l 4, L i 2 C o C 1 4, L i 2 chlorides such as M n C 1 4, L i 2 C r B r 4,
- L i bromides such 2-2PM n 1 + P B r 4 , iodides such as L i 2 C o I 4, fluorides such as L i 2 N i F 4, L i 2 M n C 1 4 - L Examples thereof include those containing a plurality of halide ions such as i 2 MnBr 4 solid solution system.
- lithium-containing halide having a spinel-like structure for example, ions other than lithium ions exist at the center of the tetrahedron
- the lithium-containing halide in the present invention is synthesized, for example, by mixing Me X 2 and Li X and heating the mixture.
- the mixing ratio of M e X 2 and L i X depends on the lithium-containing halogen to be obtained. May be selected according to the composition of the compound. For example, 1_ and M e X 2 and L i X: 2 by mixing (molar ratio), the inverse spinel structure L i 2 M e X 4 can be synthesized.
- the lithium-containing halide in the present invention can be generally represented by the formula: Li 2 -2P Mel + P X 4 .
- ⁇ is in the range of 0 ⁇ p ⁇ 0.5, where the ratio of lithium ion occupying ⁇ to Me is 1: 1 to 0: 1.
- L i 2 - is also represented by a composition of the 2P -qM e 1 + P X 4 .
- L i 2 - a 2P M e 1 + ⁇ ⁇ 4 of the lithium-containing halide be chemically oxidized M e represented by L i 2- 2 p- q M e 1 + P X 4 .
- the lithium-containing halide in the present invention has the formula:
- L i 2 — 2 P — q M e l + P XM e is at least one selected from the group consisting of T i, V, C r, M n, F e, C o, N i, and Transition metal element, X is at least one halogen element selected from the group consisting of F, Cl, Br and I, and can be represented by 0 ⁇ p ⁇ 0.5, 0 ⁇ q ⁇ 2-2p).
- any one of Ti, V, Cr, Mn, Fe, Co, Ni, and Cu may be used alone, or two or more may be used in any combination. May be used.
- Fe, Co or Mn is particularly preferred.
- halogen of the lithium-containing halide in the present invention fluorine, chlorine, bromine, and iodine can be selected.
- the halogen is bromine or iodine
- the polarization of the halide ion is large, so that the electrostatic interaction between the halide ion and the lithium ion is small. That is, lithium ions move relatively easily in these halides, and the moving speed of lithium ions in these halides is high. Then, a lithium secondary battery having excellent output current characteristics can be obtained.
- the halogen is chlorine or fluorine
- the ionic radius of the halide ion is small, so that a high capacity lithium secondary battery can be manufactured.
- the lithium ion conductive inorganic solid electrolyte in the present invention it is preferable to use a material having high ion conductivity in order to increase the output of the battery. Among them, it is preferable to use a sulfide-based lithium ion conductive inorganic solid electrolyte.
- L i 2 S- P 2 S-amorphous sulfide such as 5 (like glass) lithium ion Den conductive inorganic solid electrolyte is from Rukoto to have a more high ion conductivity 1 0- 4 SZc m It is suitable.
- These sulfide-based lithium ion conductive inorganic solid electrolytes are stable against lithium-containing halides.
- halogenated lithium When the aluminum and the sulfide-based lithium ion conductive inorganic solid electrolyte are heated at a high temperature, lithium halide is taken into the skeleton of the solid electrolyte to form a fine region composed of lithium halide. No change occurs in the crystal structure of the solid electrolyte or the fine structure of the lithium halide itself. Therefore, even when these lithium-containing halides and sulfide-based solid electrolytes are mixed, they do not react with each other to lower the characteristics.
- These sulfide-based lithium ion conductive inorganic solid electrolytes are generally synthesized by melting a mixture of starting materials at a high temperature and rapidly cooling the mixture. Among them,
- L i 2 S-S i S 2 is most suitable for industrial mass synthesis.
- Li 2 S - In S i S 2 based solid electrolyte lithium ion by S i S 2 forms an amorphous Matrigel box, add L i 2 S as a sulfide of modifying the Matrigel box to Conductivity is developed. Therefore, in order to express high ionic conductivity, it is preferable to use a composition having a high Li 2 S content. However, at too high a concentration of Li 2 S, on the contrary, the stability of the glass skeleton (matrix) decreases, and crystallization occurs, resulting in lower ionic conductivity. Therefore, it is preferable to mix the starting materials at the mixing ratios shown in the method exemplified below.
- Li 2 S and SiS 2 are thermally decomposed to change the composition.
- the temperature is lower than 700 ° C., the mixture does not melt. If the heating time exceeds 12 hours, the composition changes greatly. If the heating time is less than 1 hour, the mixture is not sufficiently melt-mixed.
- the sulfur in the LiS-SiS-based solid electrolyte is represented by a crosslinked sulfur represented by a structure of three Si-S-Si3 and a structure of ⁇ Si-iS -... Li-ten. And non-crosslinked sulfur.
- a crosslinked sulfur represented by a structure of three Si-S-Si3 and a structure of ⁇ Si-iS -... Li-ten.
- non-crosslinked sulfur When part of the sulfur of the Li 2 S—S i S 2 system solid electrolyte is replaced with oxygen, the oxygen is selectively replaced with bridging sulfur, and a structure in which the bridging oxygen is bonded to a silicon (III Si—O — S i Three)
- 1 and ⁇ represent strong covalent bonds,... Represent strong ionic bonds.
- the non-crosslinked sites are preferably occupied by sulfur.
- the lithium ion conductive sulfide-based inorganic solid electrolyte those having the crosslinked oxygen bonded to gay as described above are particularly preferable.
- Such a sulfide-based lithium ion conductive inorganic solid electrolyte having cross-linking oxygen and gayne bonded to the cross-linking oxygen includes lithium sulfide, gay sulfide and a lithium oxide such as Li 20 as an oxygen source or i. the 3 P 0 4, lithium oxyacid salt such as L i 4 S i ⁇ 4 makes the mixture as a starting material, It is obtained by melting and quenching.
- lithium oxides such as L i 2
- lithium oxyacid salts such as L i 3 P 0 4, L i 4 S i ⁇ 4.
- Li 2 S—M X S y (M represents S i B, P, etc.) Lithium oxyacid salt is added in an amount of 0.005 to 0.1 mol, more preferably 1 mol, per mol. It is preferable to contain 0.008 to 0.05 mole.
- the oxygen content in the sulfide-based lithium ion conductive inorganic solid electrolyte is adjusted to be 40 to 60 mol% with respect to silicon, the oxygen content of the crosslinked oxygen bonded to the silicon atom is adjusted.
- the amount can be optimized.
- a L i 2 F e C 1 4 is a lithium-containing halide having a spinel structure as a positive electrode active material.
- a lithium ion conductive inorganic solid electrolyte as a lithium ion conductive inorganic solid electrolyte,
- Li 2 FeC I was synthesized by the following method.
- Starting materials are lithium chloride (L i C 1) and iron chloride (F e C 12) Was used. These were mixed at a molar ratio of 2: 1 and formed into pellets under pressure and sealed in a glass tube under reduced pressure. The glass tube enclosing this mixture of starting materials was heated at 500 ° C for 3 days. Thereafter, ground in a mortar to obtain a L i 2 F e C 1 4 .
- a sulfide-based lithium ion conductive inorganic solid electrolyte was synthesized by the following method.
- Lithium phosphate as a starting material Lithium phosphate as a starting material (L i 3 P 0 4) , lithium sulfide
- the negative electrode used was a metal lithium foil (0.1 mm thick) punched out to a size of 9.4 mm.
- FIG. 1 shows a cross-sectional view of the lithium secondary battery A in this example.
- 1 is a positive electrode, and the positive electrode material obtained above was weighed so that the active material weight became 50 mg.
- Reference numeral 2 denotes a prepared lithium ion conductive inorganic solid electrolyte, which was press-molded integrally with the positive electrode 1 and then pressed against a metal lithium foil 3 as a negative electrode.
- the integrally molded pellet was placed in a stainless steel battery container 4, and sealed with a stainless steel lid 6 via an insulating gasket 5.
- the characteristics of the lithium secondary battery thus manufactured were examined by a charge / discharge test in a voltage range of 4.5 to 1.5 V at a constant current of 50 A.
- Figure 2 shows the resulting charge / discharge curve. As is clear from this figure, it was found that the lithium secondary battery produced according to the present invention exhibited a battery voltage of about 3.5 V and was chargeable and dischargeable.
- Example 2 shows a battery voltage of about 3.5 V and was chargeable
- the L i 6 F e 2 C 1 4 was used as a positive electrode active material. Also, as lithium ion conductive inorganic solid electrolyte
- L i,. 6 Fe,. 2 C 14 were synthesized by the following method.
- a lithium secondary battery was fabricated in the same manner as in Example 1 except that L i]. 6 Fe, 2 C 14 thus obtained was used as a positive electrode active material, and its charge / discharge characteristics were measured. Was examined. As a result, the charge / discharge capacity was lower than that obtained in Example 1, but the battery voltage was about 3.5 V, indicating that the battery was chargeable and dischargeable.
- L i fi Fe,. 2 C 14 used in this example was used in Example 1.
- Li FeC 1 The content of lithium ion is smaller than this.
- the charging reaction of this lithium secondary battery is a elimination reaction of lithium ions from Li, .Fe, .C1.
- L i used in Example,. 6 F e because the lithium ion is small in. 2 C 1, believed capacitance is small.
- Example 3
- the L i 6 F e C 1 4 was used as a positive electrode active material.
- a lithium ion conductive inorganic solid electrolyte As a lithium ion conductive inorganic solid electrolyte,
- LiFeC1 was synthesized by the following method.
- Example 2 Except for using thus the L i 6 F e C 1 4 obtained by the positive electrode active material, a lithium secondary battery in the same manner as in Example 1 were examined and the charge and discharge characteristics. As a result, although the charge / discharge capacity was lower than that obtained in Example 1, the battery voltage was about 3.5 V, indicating that the battery was chargeable / dischargeable.
- the L i 8 F e C 1 4 was used as a positive electrode active material.
- a lithium ion conductive inorganic solid electrolyte As a lithium ion conductive inorganic solid electrolyte,
- L i .. 8 FeC 1 was synthesized by the following method.
- the starting material was obtained in analogy to example 3 L i C l, with F e C l 2 and F e C l 3. These were mixed at a molar ratio of 1.8: 0.8: 0.2, then pressed into a pellet, and sealed in a glass tube under reduced pressure. The glass tube encapsulating this mixture of starting materials was heated at 500 for 3 days. Then, the mixture was pulverized in a mortar to obtain Li 8 FeC 1.
- the L i 2 F e C 1 4 is a lithium-containing halide having a spinel type structure as a positive electrode active material .
- a lithium secondary battery was constructed in the same manner as in Example 1 except that an indium-lithium alloy was used as the negative electrode active material, and its characteristics were examined.
- Li 2 MnC 14 was synthesized by the following method.
- the L i 2 M n C 1 4 obtained by as a positive electrode active material, a negative except that the electrode using a metal Injiumu foil (thickness l OO ⁇ m) is Example 1 and same as the method A lithium secondary battery was fabricated, and a charge / discharge test was performed in a voltage range of 4.0 to 2.0 V. As a result, the lithium secondary battery according to the present invention was chargeable and dischargeable between 4.0 and 2.0 V.
- a lithium secondary battery was constructed in the same manner as in Example 5, except that Li 2 Co C 14, which is a lithium-containing halide having a spinel structure, was used as the positive electrode active material.
- the characteristics were investigated.
- L i 2 C o C 1 4, except using L i C 1 and C o C 1 2 as starting material was synthesized in the same manner as in Example 5.
- L i 2 M n B r 4 is a lithium-containing halide having a spinel structure as the positive electrode active material, constitutes a lithium secondary battery in the same manner as in Example 5, Its characteristics were investigated.
- Example 8 Used in this way the L i 2 M n B r 4 obtained by a cathode active material, a lithium secondary battery in the same manner as in Example 5, as a result of the charge and discharge test, the lithium according to the invention The secondary battery was chargeable and dischargeable.
- Example 8
- Example 1 the electrolyte was used in Example 1 as an electrolyte.
- a lithium secondary battery was constructed in the same manner as in Example 1 except that the battery was used, and its characteristics were evaluated.
- the sulfide-based lithium ion conductive inorganic solid electrolyte is composed of a mixture of starting materials: lithium orthosilicate (Li 4 Si 4 ), lithium sulfide and gay sulfide in a molar ratio of 5:60:35.
- the synthesis was carried out in the same manner as in Example 1 except that a mixture of the above components was used.
- the negative electrode material used was a mixture of the solid electrolyte obtained above and graphite at a weight ratio of 1: 1.
- Example 9 100 mg of the positive electrode material and 50 mg of the negative electrode material were weighed, a solid electrolyte was placed between the positive electrode and the negative electrode, and they were integrally pressed and molded.
- the lithium secondary battery was produced in the same manner as in Example 1. Was prepared, and its charge / discharge characteristics were evaluated. As a result, the operating voltage of the lithium secondary battery in this example was approximately 3.4 V, indicating that the battery was chargeable and dischargeable.
- Example 1 the electrolyte was used in Example 1 as an electrolyte.
- a lithium secondary battery was constructed in the same manner as in Example 1 except that the battery was used, and its characteristics were evaluated.
- the upper limit voltage of the charge was set to 4.0 V and the lower limit voltage of the discharge was set to 1.0 V because the potential of the negative electrode was approximately 0.6 V with respect to the lithium metal electrode. .
- the lithium secondary battery in this example exhibited an operating voltage of about 3.0 V and was a chargeable / dischargeable battery.
- Example 1 the electrolyte was used in Example 1 as an electrolyte.
- Example 1 1 A lithium secondary battery was fabricated in the same manner as in Example 1 except that the sulfide-based lithium ion conductive inorganic solid electrolyte represented by 2.4 SiS 2 was used, and its charge / discharge characteristics were evaluated. As a result, the lithium secondary battery in this example also exhibited almost the same characteristics as those in Example 1.
- Example 1 1 the sulfide-based lithium ion conductive inorganic solid electrolyte represented by 2.4 SiS 2 was used, and its charge / discharge characteristics were evaluated. As a result, the lithium secondary battery in this example also exhibited almost the same characteristics as those in Example 1.
- Example 1 1 A lithium secondary battery was fabricated in the same manner as in Example 1 except that the sulfide-based lithium ion conductive inorganic solid electrolyte represented by 2.4 SiS 2 was used, and its charge / discharge characteristics were evaluated. As a result, the lithium secondary battery in this example also exhibited almost the same characteristics as those in Example 1.
- Example 1 1 the sul
- Example 1 the electrolyte was used in Example 1 as an electrolyte.
- Example 1 2 is a lithium secondary battery in the same manner as in example 1 to evaluate its charge-discharge characteristics. As a result, the lithium secondary battery of the present example also exhibited substantially the same characteristics as those of Example 1.
- Example 1 2 is a lithium secondary battery in the same manner as in example 1 to evaluate its charge-discharge characteristics. As a result, the lithium secondary battery of the present example also exhibited substantially the same characteristics as those of Example 1.
- Example 1 2 is 0.0 1 L i 3 ⁇ ⁇ 4-0.6 3 L i 2 S-0.3 L i 2 S-0 instead of the amorphous solid electrolyte represented by 0.3 S i S 2 .
- the lithium Umuion conductive amorphous solid electrolyte represented by 4 P 2 S 5 is a lithium secondary battery in the same manner as in example 1 to evaluate its charge-discharge characteristics. As a result, the lithium secondary battery of the present example also exhibited substantially the same characteristics as those of Example 1.
- Example 1 2 is a lithium secondary battery in the same manner as
- Example 1 the electrolyte was used in Example 1 as an electrolyte.
- Example 1 the electrolyte was used in Example 1 as an electrolyte.
- Example 14 the lithium secondary battery was fabricated by the same method, and its charge / discharge characteristics were evaluated. As a result, the lithium secondary battery in this example also showed almost the same characteristics as those in Example 1.
- Example 14 the lithium secondary battery in this example also showed almost the same characteristics as those in Example 1.
- L i C O_ ⁇ 2 as a positive electrode active material
- a lithium secondary battery was used to evaluate its characteristics.
- L i C O_ ⁇ 2 as a positive electrode active material was synthesized by the following method.
- Example 1 As the anode material, L i 2 F e C 1 4 obtained in Example 1, with a mixture of a solid electrolyte and a fibrous graphite.
- the positive electrode material (15 O mg) and the negative electrode material (5 O mg) thus obtained were weighed, a solid electrolyte was placed between the positive electrode and the negative electrode, and they were integrally pressed and molded.
- a lithium secondary battery was fabricated and its charge / discharge characteristics were evaluated. When charging and discharging were performed in the voltage range of 0 to 3.5 V, this lithium secondary battery was found to be a chargeable and dischargeable battery. Comparative Example 1
- Example 1 Using a liquid electrolyte is non-aqueous solvent electrolyte as an electrolyte for comparison, the L i 2 F e C 1 4 obtained in Example 1 as the positive electrode active material, Richiumu secondary with metallic lithium as an anode active material A battery was manufactured.
- lithium hexafluorophosphate (L i PF 6 ) was mixed with a solvent obtained by mixing ethylene carbonate (EC) and ethyl methyl carbonate (EMC) at a volume ratio of 1: 1. to that at a concentration of 1 M (mol l), using two kinds those dissolving L i PF 6 at a concentration of 1 M in propylene carbonate Natick preparative (PC).
- EC ethylene carbonate
- EMC ethyl methyl carbonate
- Example 2 To L i 2 F e C 1 4 obtained in Example 1, a graphite fiber added 5 wt% as a conductive material was kneaded further a fluororesin 5 wt% as a binder. this The mixture was weighed so that the weight of Li 2 FeC 14 in the mixture was 5 O mg. The mixture was filled into a high-chromium stainless steel mesh of 9.4 mm ⁇ to form a positive electrode pellet.
- This positive electrode pellet a 0.34 mm-thick lithium metal foil as a negative electrode, a 50-m-thick porous polypropylene membrane as a separator, and a cross-section as shown in Fig. 3 using the above nonaqueous solvent electrolyte
- reference numeral 7 denotes a positive electrode pellet
- 8 denotes a separator
- 9 denotes a negative electrode
- 10 denotes a stainless steel battery container, and after a nonaqueous solvent electrolyte 11 is injected, the gas is passed through a gasket 12. And sealed with lid 13.
- the charge / discharge characteristics of the lithium secondary battery thus produced were evaluated in the same manner as in Example 1. As a result, the charge / discharge efficiency showed a low value of 70% or less, and the capacity decrease accompanying the charge / discharge cycle was remarkable.
- the L i 2 F e C 1 4 was used as the positive electrode active material is dissolved in the nonaqueous electrolyte Was thought to be the cause.
- lithium-containing halide having a spinel structure or a spinel-like structure is used as one of a positive electrode active material and a negative electrode active material.
- these halides show high reversibility in lithium secondary batteries using lithium ion conductive inorganic solid electrolytes as electrolytes. It is also possible to produce a lithium secondary battery using both the positive electrode and the negative electrode.
- a chargeable / dischargeable lithium secondary battery in which an electrode active material is a lithium-containing halide having a spinel structure or a spinel-like structure is obtained by using a lithium ion conductive inorganic solid electrolyte as an electrolyte. be able to.
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99954441A EP1049183B1 (en) | 1998-11-10 | 1999-11-08 | Lithium secondary cell |
| US09/600,065 US6428935B1 (en) | 1998-11-10 | 1999-11-08 | Lithium secondary battery |
| JP2000581705A JP4578684B2 (ja) | 1998-11-10 | 1999-11-08 | リチウム二次電池 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10/318739 | 1998-11-10 | ||
| JP31873998 | 1998-11-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000028608A1 true WO2000028608A1 (en) | 2000-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1999/006219 Ceased WO2000028608A1 (en) | 1998-11-10 | 1999-11-08 | Lithium secondary cell |
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| Country | Link |
|---|---|
| US (1) | US6428935B1 (ja) |
| EP (1) | EP1049183B1 (ja) |
| JP (1) | JP4578684B2 (ja) |
| WO (1) | WO2000028608A1 (ja) |
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| JP2002097564A (ja) * | 2000-07-19 | 2002-04-02 | Sumitomo Electric Ind Ltd | アルカリ金属薄膜部材およびその製造方法 |
| WO2008059961A1 (en) * | 2006-11-17 | 2008-05-22 | Mitsubishi Heavy Industries, Ltd. | Cathode active material for nonaqueous electrolyte secondary battery and method of producing cathode active material for nonaqueous electrolyte secondary battery |
| JP2011129312A (ja) * | 2009-12-16 | 2011-06-30 | Toyota Motor Corp | 硫化物固体電解質材料の製造方法、硫化物固体電解質材料およびリチウム電池 |
| JP2012094445A (ja) * | 2010-10-28 | 2012-05-17 | Toyota Motor Corp | 硫化物固体電解質粒子 |
| WO2014109191A1 (ja) * | 2013-01-11 | 2014-07-17 | トヨタ自動車株式会社 | 硫化物固体電解質材料、電池および硫化物固体電解質材料の製造方法 |
| US9356315B2 (en) | 2010-08-26 | 2016-05-31 | Toyota Jidosha Kabushiki Kaisha | Sulfide solid electrolyte material and lithium solid state battery |
| WO2020070957A1 (ja) * | 2018-10-01 | 2020-04-09 | パナソニックIpマネジメント株式会社 | ハロゲン化物固体電解質材料およびこれを用いた電池 |
| WO2020070958A1 (ja) * | 2018-10-01 | 2020-04-09 | パナソニックIpマネジメント株式会社 | ハロゲン化物固体電解質材料およびこれを用いた電池 |
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| JPWO2020188914A1 (ja) * | 2019-03-15 | 2020-09-24 | ||
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| WO2020188915A1 (ja) * | 2019-03-15 | 2020-09-24 | パナソニックIpマネジメント株式会社 | 固体電解質材料およびこれを用いた電池 |
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| US11652235B2 (en) | 2018-01-26 | 2023-05-16 | Panasonic Intellectual Property Management Co., Ltd. | Battery |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP1049183A1 (en) | 2000-11-02 |
| EP1049183A4 (en) | 2005-04-27 |
| JP4578684B2 (ja) | 2010-11-10 |
| EP1049183B1 (en) | 2011-08-03 |
| US6428935B1 (en) | 2002-08-06 |
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