WO2021166705A1 - LiCB9H10の高温相を含むイオン伝導体およびその製造方法 - Google Patents
LiCB9H10の高温相を含むイオン伝導体およびその製造方法 Download PDFInfo
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Definitions
- the present invention ion conductor comprising a high-temperature phase of licB 9 H 10 and a method for producing the same.
- lithium-ion secondary batteries In recent years, the demand for lithium-ion secondary batteries has been increasing in applications such as personal digital assistants, portable electronic devices, electric vehicles, hybrid electric vehicles, and stationary power storage systems.
- the current lithium ion secondary battery uses a flammable organic solvent as the electrolytic solution, and requires a strong exterior so that the organic solvent does not leak.
- the structure of the device such as the need to take a structure in case of a risk that the electrolytic solution leaks out.
- All-solid-state batteries are roughly classified into thin film type and bulk type.
- the electrode layer is as thin as several ⁇ m, the electrode area is small, and the energy stored per cell is small. , The cost is also high. Therefore, it is not suitable as a battery for a large power storage device or an electric vehicle that needs to store a large amount of energy.
- the thickness of the bulk type electrode layer can be several tens of ⁇ m to 100 ⁇ m, and an all-solid-state battery having a high energy density can be manufactured.
- Patent Documents 1 and 2 Among solid electrolytes, sulfides and complex hydrides have high ionic conductivity and are relatively soft, so they have the characteristic of easily forming an interface between solids.
- the conventional sulfide solid electrolyte has a property of reacting with water, and the sulfide has a problem that hydrogen sulfide is generated and the ionic conductivity is lowered after reacting with water.
- the complex hydride solid electrolyte tends to have a slightly lower ionic conductivity than the sulfide solid electrolyte, and improvement in the ionic conductivity is desired.
- Non-Patent Document 1 describes a solid electrolyte (6.7 mS / cm, 25 ° C.) called a carbide system having high ionic conductivity, but a mechanical milling method is used. The mechanical milling method has a problem in mass production, and a mass synthesis method using a solution is desired.
- Non-Patent Document 2 a solid electrolyte solution in which a boron hydride compound, which is a solid electrolyte, is dissolved is applied to the mating surface of the positive electrode layer and the negative electrode layer of the electrode, and then the solvent is removed and the solid electrolyte solution is bonded to a low press.
- a method for producing an all-solid-state battery having excellent productivity by applying pressure is disclosed.
- Non-Patent Document 3 although ionic conductivity is called Kaboren system using water solvent is synthesized (5 mS / cm at 35 ° C.) higher solid electrolyte, the only high-temperature phase of licB 9 H 10 There is no, and it is a double phase of LiCB 9 H 10 and LiCB 11 H 12. Further improvement of ionic conductivity is desired.
- Patent 6246816 WO2017-126416
- An object of the present invention is to provide an ionic conductor having excellent various properties such as ionic conductivity and a method for producing the same.
- the solvent in the solution step is at least one selected from the group consisting of water, tetrahydrofuran, acetonitrile, acetone, ethyl acetate, methyl acetate, toluene, methylene chloride, and chloroform, according to ⁇ 1> above.
- ⁇ 3> The method for producing an ionic conductor according to ⁇ 1> above, wherein the solvent in the solution step is water.
- ⁇ 4> The method for producing an ionic conductor according to any one of ⁇ 1> to ⁇ 3> above, wherein the stirring and mixing time in the solution step is 5 minutes to 48 hours.
- ⁇ 6> The method for producing an ionic conductor according to any one of ⁇ 1> to ⁇ 5> above, wherein the temperature in the drying step is 50 to 260 ° C.
- ⁇ 7> The method for producing an ionic conductor according to any one of ⁇ 1> to ⁇ 6> above, wherein the drying time in the drying step is 1 to 24 hours.
- ⁇ 8> The method for producing an ionic conductor according to any one of ⁇ 1> to ⁇ 7> above, wherein the temperature in the heat treatment step is 150 to 260 ° C.
- ⁇ 9> The method for producing an ionic conductor according to any one of ⁇ 1> to ⁇ 8>, wherein the heating time in the heat treatment step is 1 to 24 hours.
- the resulting ion conductor has a single phase crystal structure of the high temperature phase of licB 9 H 10, a method of producing an ionic conductor according the to any one of ⁇ 1> to ⁇ 9>.
- A (16.4 ⁇ 0.3 deg X-ray diffraction intensity)-(20 deg X-ray diffraction intensity)
- B (17.1 ⁇ 0.5 deg X-ray diffraction intensity)-(20 deg)
- B (17.1 ⁇ 0.5 deg X-ray diffraction intensity)-(20 deg)
- ⁇ 12> The method for producing an ionic conductor according to any one of ⁇ 1> to ⁇ 11> above, wherein the obtained ionic conductor has an ionic conductivity of 1.0 to 10
- ⁇ 13> The ionic conductor obtained by the method for producing an ionic conductor according to any one of ⁇ 1> to ⁇ 12> above.
- ⁇ 14> The electrode using the ionic conductor according to ⁇ 13> above.
- ⁇ 15> An all-solid-state battery using the ion conductor according to ⁇ 13> above.
- an ionic conductor having excellent various properties such as ionic conductivity and a method for producing the ionic conductor.
- FIG. 1 shows the X-ray diffraction peak in the powder of the ionic conductor obtained in Example 1.
- FIG. 2 shows the Raman spectrum of the ionic conductor obtained in Example 1.
- FIG. 3 shows the measurement results of the ionic conductivity of the ionic conductor obtained in Example 1.
- FIG. 4 shows the measurement results of the differential thermal analysis DTA obtained in Example 1.
- the above embodiments preferably comprises a high temperature phase of licB 9 H 10 (high ion conductive phase) as crystals, more preferably, includes a high temperature phase of licB 9 H 10 (high ion conductive phase) as crystals, and, It is composed of LiCB 9 H 10 and LiCB 11 H 12 .
- Ion conductor of the present invention in Raman spectroscopy, to have the respective peak to 749cm -1 based on LiCB 9 H 10 ( ⁇ 5cm -1 ) and licB 11 H based on 12 763cm -1 ( ⁇ 5cm -1) Is preferable. There may be peaks in other regions, but the peaks showing the characteristics of each are as described above.
- the ionic conductor of the present invention preferably contains a high temperature phase of LiCB 9 H 10 as a crystal.
- LiCB 9 H 10 has a high temperature phase and a low temperature phase due to its crystalline state, and although it has high ionic conductivity in the high temperature phase at a high temperature (for example, about 75 to 150 ° C.), it is near room temperature (for example, 20). In (about 65 ° C.), the low temperature phase is reached, and the ionic conductivity is lowered.
- the intensity ratio (B / A) calculated in (X-ray diffraction intensity) is in the range of 1.0 to 20, more preferably in the range of 1.0 to 15, and particularly preferably in the range of 1.0 to 10.
- the intensity ratio (B / A) is in the range of 1.0 to 20
- Other components include, for example, oxygen (O), nitrogen (N), sulfur (S), fluorine (F), chlorine (Cl), bromine (Br), iodine (I), silicon (Si), germanium ( Ge), phosphorus (P), alkali metal, alkaline earth metal and the like can be mentioned.
- the above-mentioned ionic conductor is soft and can be formed into an electrode layer and a solid electrolyte layer by cold pressing.
- the electrode layer and the solid electrolyte layer thus formed are superior in strength as compared with the case where a large amount of the sulfide solid electrolyte and the oxide solid electrolyte are contained. Therefore, by using the ionic conductor of the present invention, it is possible to produce an electrode layer and a solid electrolyte layer having good moldability and being hard to crack (hard to cause cracks). Further, since the ionic conductor of the present invention has a low density, a relatively light electrode layer and a solid electrolyte layer can be produced. This is preferable because the weight of the entire battery can be reduced.
- the ionic conductor of the present invention when used in the solid electrolyte layer, the interfacial resistance with the electrode layer can be lowered. Furthermore, the above-mentioned ionic conductor does not decompose even when it comes into contact with moisture or oxygen, and does not generate dangerous toxic gas.
- the ionic conductor of the present invention preferably has an ionic conductivity at 25 ° C. of 1.0 to 10 mScm -1 , and more preferably 2.0 to 10 mScm -1.
- a method for producing the ion conductor is provided, which comprises a heat treatment step of heat-treating the precursor to obtain an ion conductor.
- the "uniform solution” contains at least lithium (Li), carbon (C), boron (B) and hydrogen (H) in the solvent, there is no undissolved precipitate, and the raw material is the solvent. It is defined as a solution in a dissolved state.
- the purity is preferably 95% or more, more preferably 98% or more. By using a compound having a purity in the above range, a desired crystal can be easily obtained.
- the ionic conductivity shows a particularly high value in this range.
- the mixture of LiCB 9 H 10 and LiCB 11 H 12 can be mixed in the air with a uniform solvent.
- the solvent is not particularly limited, but water, a nitrile solvent such as acetonitrile, an ether solvent such as tetrahydrofuran and diethyl ether, N, N-dimethylformamide, N, N-dimethylacetamide, methanol and ethanol.
- a nitrile solvent such as acetonitrile
- an ether solvent such as tetrahydrofuran and diethyl ether
- N, N-dimethylformamide N, N-dimethylacetamide
- methanol and ethanol examples thereof include alcohol solvents such as acetone, ethyl acetate, methyl acetate, toluene, methylene chloride, and chloroform.
- water is particularly preferable for safety reasons.
- the mixing time in the solvent varies depending on the mixing method, but in the case of stirring and mixing in the solvent, it is preferably 5 minutes to 48 hours, more preferably 5 minutes to 1 hour.
- the pressure in the solution step is usually in the range of 0.1 Pa to 2 MPa as an absolute pressure. It is preferably 101 kPa to 1 MPa.
- the solution step is preferably carried out in an inert gas atmosphere or in a sufficiently dry atmosphere.
- the inert gas is not particularly limited, but argon is particularly preferable.
- the drying temperature of the solvent in the drying step is usually in the range of 50 to 300 ° C. It is preferably 50 ° C. to 260 ° C., and more preferably 150 to 220 ° C.
- the drying time of the solvent in the drying step varies slightly depending on the type of solvent and the drying temperature, but the solvent can be sufficiently removed by carrying out the process for 1 to 24 hours.
- the drying time of the solvent is more preferably 10 to 14 hours.
- the depressurizing condition of the solvent in the drying step is usually 10 -1 Pa or less. It is preferably 5 ⁇ 10 -4 Pa or less.
- the precursor obtained in the drying step is heat-treated to obtain an ionic conductor.
- the heating temperature is preferably in the range of 150 to 260 ° C, more preferably in the range of 180 to 220 ° C. If the temperature is lower than the above range, desired crystals are unlikely to be formed, while if the temperature is higher than the above range, crystals other than the intended ones may be formed.
- the heating time varies slightly in relation to the heating temperature, it can usually be sufficiently crystallized in the range of 1 to 24 hours. Heating at a high temperature for a long time exceeding the above range is not preferable because there is a concern about deterioration of the ionic conductor. A more preferred heating time is in the range of 10-14 hours.
- the heating can be performed in a vacuum to 1 MPa or an atmosphere of an inert gas, but is preferably under vacuum.
- the inert gas nitrogen, helium, argon or the like can be used, but argon is particularly preferable.
- heat treatment instead of vacuuming, for example, heat treatment can be performed in an argon atmosphere under the condition of 1 MPa. It is preferable that oxygen and water are low.
- Ion conductor obtained by the production method of the present invention in Raman spectroscopy, 749cm -1 ( ⁇ 5cm -1) based on licB 9 H 10 and licB 11 H based on 12 763cm -1 ( ⁇ 5cm -1 ), It is preferable that each has a peak.
- the ionic conductor of the present invention can be used as a solid electrolyte for all-solid-state batteries. Therefore, according to one embodiment of the present invention, a solid electrolyte for an all-solid-state battery including the above-mentioned ionic conductor is provided. Further, according to a further embodiment of the present invention, an all-solid-state battery using the above-mentioned solid electrolyte for an all-solid-state battery is provided.
- the all-solid-state battery is an all-solid-state battery in which lithium ions are responsible for electrical conduction, and in particular, an all-solid-state lithium ion secondary battery.
- the all-solid-state battery has a structure in which a solid electrolyte layer is arranged between a positive electrode layer and a negative electrode layer.
- the ionic conductor of the present invention may be contained as a solid electrolyte in any one or more of the positive electrode layer, the negative electrode layer and the solid electrolyte layer. When used for the electrode layer, it is preferably used for the negative electrode layer rather than the positive electrode layer. This is because the negative electrode layer is less likely to cause side reactions.
- the positive electrode layer or the negative electrode layer contains the ion conductor of the present invention
- the ion conductor and a known positive electrode active material or negative electrode active material for a lithium ion secondary battery are used in combination.
- the negative electrode layer it is preferable to use a bulk type in which an active material and a solid electrolyte are mixed, because the capacity per single cell increases.
- the all-solid-state battery is manufactured by molding and laminating each of the above-mentioned layers, but the molding method and laminating method of each layer are not particularly limited.
- a method in which a solid electrolyte and / or an electrode active material is dispersed in a solvent to form a slurry, which is applied by a doctor blade, spin coating, etc., and rolled to form a film vacuum deposition method, ion plating.
- a vapor phase method in which film formation and lamination are performed using a method, a sputtering method, a laser ablation method, or the like; there is a press method in which powder is formed by hot pressing or cold pressing without applying temperature, and the powder is laminated.
- the ionic conductor of the present invention is relatively soft, it is particularly preferable to form and stack the ionic conductor by pressing to produce a battery.
- an electrode layer containing an active material, a conductive additive, and binders is formed in advance, and a solution in which a solid electrolyte is dissolved in a solvent or a slurry in which the solid electrolyte is dispersed in the solvent is poured into the electrode layer, and then the solvent is poured. It is also possible to put a solid electrolyte into the electrode layer by removing the solvent.
- Moisture control is in the range of dew point ⁇ 10 ° C. to ⁇ 100 ° C., more preferably in the range of dew point ⁇ 20 ° C. to ⁇ 80 ° C., and particularly preferably in the range of dew point ⁇ 30 ° C. to ⁇ 75 ° C. This is to prevent the ionic conductivity from being lowered by forming a hydrate, although the hydrolysis rate of the ionic conductor of the present invention is extremely slow.
- the obtained uniform solution was dried in a glass tube oven under a reduced pressure condition of 0.1 Pa or less at 150 ° C. for 12 hours to remove pure water, and a dried white powder (precursor) was obtained.
- the obtained white powder was kneaded in a mortar for 15 minutes, and 50 mg was pelletized at 240 MPa and subjected to vacuum heat treatment at 200 ° C. for 12 hours using a turbo pump.
- the AC impedance method of the obtained ionic conductor was measured, and the ionic conductivity was measured.
- the high temperature phase of LiCB 9 H 10 was stabilized in the obtained ionic conductor. No phase transition was observed in the DTA measurement, and the Raman spectrum showed the same spectrum as that produced by Milling synthesis.
- Example 1 also shows the X-ray diffraction peaks of the raw materials LiCB 9 H 10 and LiCB 11 H 12 and LiCB 9 H 10 (high temperature phase at 150 ° C.).
- the intensities of the peak positions of 16.44 deg and 17.07 deg, which are the peak positions of the high temperature phase of LiCB 9 H 10, were defined as A and B, respectively.
- Example 2 ⁇ Ion conductivity measurement>
- the ionic conductors obtained in Example 1 the raw materials LiCB 9 H 10 and LiCB 11 H 12 were subjected to uniaxial molding (240 MPa), and a disc having a thickness of about 1 mm and a diameter of 8 mm was prepared.
- Manufactured The temperature is raised and lowered at 10 ° C intervals in the temperature range of 150 ° C or 80 ° C from room temperature, and AC impedance measurement (HIOKI 3532-80, chemical impedance meter) using a two-terminal method using a lithium electrode is performed to determine the ionic conductivity. Calculated.
- the measurement frequency range was 4 Hz to 1 MHz, and the amplitude was 100 mV.
- Table 1 shows the ionic conductivity and activation energy at room temperature (25 ° C.).
- Example 1 the phenomenon of a sharp decrease in ionic conductivity at low temperatures observed in the raw materials LiCB 9 H 10 and LiCB 11 H 12 was not observed.
- Table 1 shows the ionic conductivity of the ionic conductor obtained in Comparative Example 1.
- Example 1 The powder of the ionic conductor obtained in Example 1 was subjected to a differential calorimetry DTA device (Rigaku Thermo Plus TG-8120 system) in an argon atmosphere, and the temperature was raised / lowered from room temperature to 200 ° C. The differential calorimetry DTA was measured in min. In Example 1, the phase transition observed in the raw materials LiCB 9 H 10 and LiCB 11 H 12 was not observed.
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Abstract
Description
例えば、全固体リチウムイオン二次電池における固体電解質として、酸化物、リン酸化合物、有機高分子、硫化物、錯体水素化物等を使用することが検討されている。
<1> LiCB9H10およびLiCB11H12を含むイオン伝導体の製造方法であって、
LiCB9H10とLiCB11H12とを、LiCB9H10/LiCB11H12=1.1~20のモル比で溶媒中で混合して均一溶液を調製する溶液化工程と、
前記均一溶液から前記溶媒を除去して前駆体を得る乾燥工程と、
前記前駆体を加熱処理してイオン伝導体を得る加熱処理工程と、
を含むことを特徴とする、前記イオン伝導体の製造方法である。
<2> 前記溶液化工程における溶媒が、水、テトラヒドロフラン、アセトニトリル、アセトン、酢酸エチル、酢酸メチル、トルエン、塩化メチレン、及びクロロホルムからなる群より選ばれる少なくとも1種である、上記<1>に記載のイオン伝導体の製造方法である。
<3> 前記溶液化工程における溶媒が水からなる、上記<1>に記載のイオン伝導体の製造方法である。
<4> 前記溶液化工程における攪拌混合時間が、5分~48時間である、上記<1>から<3>のいずれかに記載のイオン伝導体の製造方法である。
<5> 前記溶液化工程におけるLiCB9H10とLiCB11H12とのモル比が、LiCB9H10/LiCB11H12=1.5~9である、上記<1>から<4>のいずれかに記載のイオン伝導体の製造方法である。
<6> 前記乾燥工程における温度が、50~260℃である、上記<1>から<5>のいずれかに記載のイオン伝導体の製造方法である。
<7> 前記乾燥工程における乾燥時間が、1~24時間である、上記<1>から<6>のいずれかに記載のイオン伝導体の製造方法である。
<8> 前記加熱処理工程における温度が、150~260℃である、上記<1>から<7>のいずれかに記載のイオン伝導体の製造方法である。
<9> 前記加熱処理工程における加熱時間が、1~24時間である、上記<1>から<8>のいずれかに記載のイオン伝導体の製造方法である。
<10> 得られたイオン伝導体が、LiCB9H10の高温相の単相結晶構造を有する、上記<1>から<9>のいずれかに記載のイオン伝導体の製造方法である。
<11> 得られたイオン伝導体が、25℃におけるX線回折測定において、少なくとも2θ=14.9±0.3deg、16.4±0.3deg、17.1±0.5degにX線回折ピークを有し、A=(16.4±0.3degのX線回折強度)-(20degのX線回折強度)、B=(17.1±0.5degのX線回折強度)-(20degのX線回折強度)、にて算出した強度比(B/A)が1.0~20である、上記<1>から<10>のいずれかに記載のイオン伝導体の製造方法である。
<12> 得られたイオン伝導体の25℃におけるイオン伝導度が1.0~10mScm-1である、上記<1>から<11>のいずれかに記載のイオン伝導体の製造方法である。
<13> 上記<1>から<12>のいずれかに記載のイオン伝導体の製造方法によって得られたイオン伝導体である。
<14> 上記<13>に記載のイオン伝導体を用いた電極である。
<15> 上記<13>に記載のイオン伝導体を用いた全固体電池である。
本発明の1つの実施形態によると、リチウム(Li)と炭素(C)とホウ素(B)と水素(H)とを含むイオン伝導体が提供される。上記実施形態は、好ましくは、結晶としてLiCB9H10の高温相(高イオン伝導相)を含み、より好ましくは、結晶としてLiCB9H10の高温相(高イオン伝導相)を含み、かつ、LiCB9H10およびLiCB11H12から構成される。
本発明のイオン伝導体は、25℃におけるX線回折測定において、少なくとも2θ=14.9±0.3deg、16.4±0.3deg、17.1±0.5degにLiCB9H10の高温相に基づくX線回折ピークを有することが好ましい。より好ましくは、A=(16.4±0.3degのX線回折強度)-(20degのX線回折強度)、B=(17.1±0.5degのX線回折強度)-(20degのX線回折強度)、にて算出した強度比(B/A)が1.0~20の範囲であり、1.0~15の範囲が更に好ましく、1.0~10の範囲が特に好ましい。強度比(B/A)が1.0~20の範囲となる場合は、LiCB9H10の高温相にLiCB11H12が固溶することで相転移温度が低下し、室温付近においてもイオン伝導度が高い状態を維持することができる。この固溶が成り立つのは、LiCB9H10/LiCB11H12=1.1以上のモル比の時である。好ましくはLiCB9H10/LiCB11H12=1.1~20であり、より好ましくはLiCB9H10/LiCB11H12=1.25~10であり、特に好ましくはLiCB9H10/LiCB11H12=1.5~9であり、この範囲においてはイオン伝導度が高い値を示す。
なお、本発明のイオン伝導体は、上記以外のX線回折ピークを含んでいたとしても、所望の効果が得られる。
また、本発明のイオン伝導体は、リチウム(Li)と炭素(C)とホウ素(B)と水素(H)以外の成分を含んでいてもよい。他の成分としては、例えば、酸素(O)、窒素(N)、硫黄(S)、フッ素(F)、塩素(Cl)、臭素(Br)、ヨウ素(I)、ケイ素(Si)、ゲルマニウム(Ge)、リン(P)、アルカリ金属、アルカリ土類金属等が挙げられる。
更に、上記のイオン伝導体は、水分や酸素に触れても分解することがなく、危険な毒性ガスを発生することがない。
本発明の別の実施形態によると、LiCB9H10およびLiCB11H12を含むイオン伝導体の製造方法であって、LiCB9H10とLiCB11H12とを、LiCB9H10/LiCB11H12=1.1~20のモル比で溶媒中で混合して均一溶液を調製する溶液化工程と、前記均一溶液から前記溶媒を除去して前駆体を得る乾燥工程と、前記前駆体を加熱処理してイオン伝導体を得る加熱処理工程とを含む、前記イオン伝導体の製造方法が提供される。
なお、本発明において「均一溶液」とは、溶媒中に少なくともリチウム(Li)と炭素(C)とホウ素(B)と水素(H)とを含み、未溶解の沈殿がなく、原料が前記溶媒に溶解した状態の溶液と定義される。
溶液化工程は、不活性ガス雰囲気下あるいは十分に乾燥した大気下で行うことが好ましい。不活性ガスとしては特に限定されるものではないが、アルゴンが特に好ましい。
また、乾燥工程における溶媒の乾燥時間は、溶媒の種類と乾燥温度によって多少異なるが、1~24時間実施することで十分に溶媒を除去することができる。溶媒の乾燥時間は、より好ましくは10~14時間である。なお、真空乾燥のように減圧下で溶媒を除去することや、十分に水分の少ない窒素やアルゴン等の不活性ガスを流すことで、溶媒を除去する際の温度を下げると共に所要時間を短くすることができる。なお、後段の加熱処理工程と乾燥工程とを同時に行うことも可能である。
加熱温度は、150~260℃の範囲が好ましく、より好ましくは180~220℃の範囲である。上記範囲よりも温度が低いと所望の結晶が生じにくく、一方、上記範囲よりも温度が高くても、目的とする以外の結晶が生成することがある。
加熱は、真空~1MPaもしくは不活性ガス雰囲気下で行うことができるが、好ましくは真空下である。不活性ガスとしては、窒素、ヘリウム、アルゴンなどを使用することができるが、中でもアルゴンが好ましい。本発明では、真空の代わりに、例えば、アルゴン雰囲気で1MPaの条件で加熱処理することもできる。酸素や水分は低いことが好ましい。
本発明のイオン伝導体は、全固体電池用の固体電解質として使用され得る。よって、本発明の一実施形態によると、上述したイオン伝導体を含む全固体電池用固体電解質が提供される。また、本発明のさらなる実施形態によると、上述した全固体電池用固体電解質を使用した全固体電池が提供される。
(実施例1)
アルゴン雰囲気下のグローブボックス内で、LiCB9H10:LiCB11H12=7:3のモル比になるようにLiCB9H10(Katchem社製)を240mg、LiCB11H12(Katchem社製)を122.2mg量り取った。次に、先程量り取ったLiCB9H10とLiCB11H12の混合粉末に純水(Water, Reagent, Alfa Aesar)を10mL加えて溶解させて、スターラーを用いて30分間攪拌した。得られた均一溶液をガラスチューブオーブンで0.1Pa以下の減圧条件の下、150℃、12時間乾燥させることで純水を除去し、乾燥した白色粉末(前駆体)を得た。得られた白色粉末を15分間、乳鉢で混錬した50mgを240MPaでペレット化し、200℃、12時間ターボポンプを使用して真空加熱処理を行った。得られたイオン伝導体の交流インピータンス法測定を行い、イオン伝導度を測定した。X線回折の結果、得られたイオン伝導体はLiCB9H10の高温相が安定化されていた。DTA測定においても相転移が見られず、ラマンスペクトルもミリング合成で作ったものと同じスペクトルを示した。
実施例1において、LiCB9H10:LiCB11H12=5:5のモル比となるように原料を使用した以外は、実施例1と同様にイオン伝導体を製造した。
実施例1で得られたイオン伝導体の粉末について、アルゴン雰囲気下、室温(25℃)下、リンデマンガラスキャピラリー(外径0.5mm、厚さ0.01mm)を用いて、X線回折測定(PANalytical社製X‘pert Pro、CuKα:λ=1.5405Å)を実施した。得られたX線回折ピークを図1に示す。図1には比較のため、原料であるLiCB9H10およびLiCB11H12とLiCB9H10(150℃の高温相)のX線回折ピークも示す。
実施例1では、少なくとも、2θ=14.9±0.3deg、16.4±0.3deg、17.1±0.5degにX線回折ピークが観測された。また、LiCB9H10の高温相のピーク位置である16.44degおよび17.07degのピーク位置の強度をそれぞれAおよびBとした。なお、それぞれの強度は、2θ=20degの値をベースラインとみなし、A=(16.44degのX線回折強度)-(20degのX線回折強度)、B=(17.07degのX線回折強度)-(20degのX線回折強度)、にて算出した。
実施例1は、LiCB9H10の高温相のピーク位置と一致することから固溶体となっていることがわかる。
(1)試料調製
上部に石英ガラス(Φ60mm、厚さ1mm)を光学窓として有する密閉容器を用いて測定試料の作製を行った。アルゴン雰囲気下のグローブボックスにて、試料を石英ガラスに接する状態で保液させた後、容器を密閉してグローブボックス外に取り出し、ラマン分光測定を行った。
(2)測定条件
レーザーラマン分光光度計NRS-5100(日本分光株式会社製)を使用し、励起波長532.15nm、露光時間5秒にて測定を行った。得られたラマンスペクトルを図2に示す。
LiCB9H10は749cm-1にピークを有し、LiCB11H12は763cm-1にピークを有する。なお、ラマンシフト値は結合に由来するものであり、結晶状態にはほとんど左右されない。実施例1においては763cm-1のピークが749cm-1のショルダーピークとなっていることがわかる。
アルゴン雰囲気下のグローブボックス内で、実施例1で得られたイオン伝導体、原料であるLiCB9H10およびLiCB11H12を一軸成型(240MPa)に供し、厚さ約1mm、φ8mmのディスクを製造した。室温から150℃もしくは80℃の温度範囲において10℃間隔で昇温・降温させ、リチウム電極を利用した二端子法による交流インピーダンス測定(HIOKI 3532-80、chemical impedance meter)を行い、イオン伝導度を算出した。測定周波数範囲は4Hz~1MHz、振幅は100mVとした。
実施例1で得られたイオン伝導体の粉末について、アルゴン雰囲気化で示差熱量測定DTA装置(Rigaku Thermo Plus TG-8120 system)を用いて、室温から200℃、昇温/降温温度は5℃/minで示差熱量DTA測定を行った。なお、実施例1は、原料のLiCB9H10およびLiCB11H12に見られる相転移が見られなかった。
Claims (15)
- LiCB9H10およびLiCB11H12を含むイオン伝導体の製造方法であって、
LiCB9H10とLiCB11H12とを、LiCB9H10/LiCB11H12=1.1~20のモル比で溶媒中で混合して均一溶液を調製する溶液化工程と、
前記均一溶液から前記溶媒を除去して前駆体を得る乾燥工程と、
前記前駆体を加熱処理してイオン伝導体を得る加熱処理工程と、
を含むことを特徴とする、前記イオン伝導体の製造方法。 - 前記溶液化工程における溶媒が、水、テトラヒドロフラン、アセトニトリル、アセトン、酢酸エチル、酢酸メチル、トルエン、塩化メチレン、及びクロロホルムからなる群より選ばれる少なくとも1種である、請求項1に記載のイオン伝導体の製造方法。
- 前記溶液化工程における溶媒が水からなる、請求項1に記載のイオン伝導体の製造方法。
- 前記溶液化工程における攪拌混合時間が、5分~48時間である、請求項1から3のいずれかに記載のイオン伝導体の製造方法。
- 前記溶液化工程におけるLiCB9H10とLiCB11H12とのモル比が、LiCB9H10/LiCB11H12=1.5~9である、請求項1から4のいずれかに記載のイオン伝導体の製造方法。
- 前記乾燥工程における温度が、50~260℃である、請求項1から5のいずれかに記載のイオン伝導体の製造方法。
- 前記乾燥工程における乾燥時間が、1~24時間である、請求項1から6のいずれかに記載のイオン伝導体の製造方法。
- 前記加熱処理工程における温度が、150~260℃である、請求項1から7のいずれかに記載のイオン伝導体の製造方法。
- 前記加熱処理工程における加熱時間が、1~24時間である、請求項1から8のいずれかに記載のイオン伝導体の製造方法。
- 得られたイオン伝導体が、LiCB9H10の高温相の単相結晶構造を有する、請求項1から9のいずれかに記載のイオン伝導体の製造方法。
- 得られたイオン伝導体が、25℃におけるX線回折測定において、少なくとも2θ=14.9±0.3deg、16.4±0.3deg、17.1±0.5degにX線回折ピークを有し、A=(16.4±0.3degのX線回折強度)-(20degのX線回折強度)、B=(17.1±0.5degのX線回折強度)-(20degのX線回折強度)、にて算出した強度比(B/A)が1.0~20である、請求項1から10のいずれかに記載のイオン伝導体の製造方法。
- 得られたイオン伝導体の25℃におけるイオン伝導度が1.0~10mScm-1である、請求項1から11のいずれかに記載のイオン伝導体の製造方法。
- 請求項1から12のいずれかに記載のイオン伝導体の製造方法によって得られたイオン伝導体。
- 請求項13に記載のイオン伝導体を用いた電極。
- 請求項13に記載のイオン伝導体を用いた全固体電池。
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| CA3170505A CA3170505A1 (en) | 2020-02-17 | 2021-02-08 | Ion conductor containing high-temperature phase of licb9h10 and method for producing same |
| JP2022501806A JP7714519B2 (ja) | 2020-02-17 | 2021-02-08 | LiCB9H10の高温相を含むイオン伝導体およびその製造方法 |
| US17/799,037 US20230083286A1 (en) | 2020-02-17 | 2021-02-08 | ION CONDUCTOR CONTAINING HIGH-TEMPERATURE PHASE OF LiCB9H10 AND METHOD FOR PRODUCING SAME |
| BR112022015016A BR112022015016A2 (pt) | 2020-02-17 | 2021-02-08 | Método para produzir um condutor iônico, condutor iônico, eletrodo, e, bateria de estado sólido |
| KR1020227026974A KR102855910B1 (ko) | 2020-02-17 | 2021-02-08 | LiCB9H10의 고온상을 포함하는 이온 전도체 및 그의 제조 방법 |
| EP21756196.8A EP4109600A4 (en) | 2020-02-17 | 2021-02-08 | ION CONDUCTOR CONTAINING HIGH-TEMPERATURE PHASE OF LICB9H10, AND METHOD FOR MANUFACTURING THE SAME |
| AU2021224331A AU2021224331B2 (en) | 2020-02-17 | 2021-02-08 | Ion conductor containing high-temperature phase of LiCB9H10 and method for producing same |
| CN202180009784.2A CN114982030B (zh) | 2020-02-17 | 2021-02-08 | 包含LiCB9H10的高温相的离子导体及其制造方法 |
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| CN117069120B (zh) * | 2023-07-14 | 2025-11-18 | 东风汽车集团股份有限公司 | Li9B19S33晶体的制备方法 |
| CN117069121B (zh) * | 2023-07-14 | 2025-11-18 | 东风汽车集团股份有限公司 | 一种钨掺杂Li9B19S33的制备方法 |
| WO2025110834A1 (ko) * | 2023-11-24 | 2025-05-30 | 주식회사 리베스트 | 전기화학 셀 |
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| WO2017126416A1 (ja) | 2016-01-18 | 2017-07-27 | 三菱瓦斯化学株式会社 | イオン伝導体の製造方法 |
| JP6246816B2 (ja) | 2013-09-02 | 2017-12-13 | 三菱瓦斯化学株式会社 | 全固体電池 |
| WO2018139629A1 (ja) * | 2017-01-30 | 2018-08-02 | 三菱瓦斯化学株式会社 | イオン伝導体及びその製造方法 |
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| ES3037041T3 (en) * | 2018-08-23 | 2025-09-26 | Mitsubishi Gas Chemical Co | Ionic conductor containing high-temperature phase of licb9h10, method for manufacturing same, and solid electrolyte for all-solid-state battery containing said ion conductor |
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| JP6246816B2 (ja) | 2013-09-02 | 2017-12-13 | 三菱瓦斯化学株式会社 | 全固体電池 |
| WO2017126416A1 (ja) | 2016-01-18 | 2017-07-27 | 三菱瓦斯化学株式会社 | イオン伝導体の製造方法 |
| WO2018139629A1 (ja) * | 2017-01-30 | 2018-08-02 | 三菱瓦斯化学株式会社 | イオン伝導体及びその製造方法 |
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| WO2025110088A1 (ja) * | 2023-11-24 | 2025-05-30 | 三菱瓦斯化学株式会社 | 固体電解質シート及びその製造方法、並びに該固体電解質シートを有する全固体電池 |
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| KR102855910B1 (ko) | 2025-09-04 |
| JPWO2021166705A1 (ja) | 2021-08-26 |
| CA3170505A1 (en) | 2021-08-26 |
| EP4109600A4 (en) | 2024-01-03 |
| US20230083286A1 (en) | 2023-03-16 |
| BR112022015016A2 (pt) | 2022-09-20 |
| CN114982030B (zh) | 2025-12-16 |
| KR20220143824A (ko) | 2022-10-25 |
| CN114982030A (zh) | 2022-08-30 |
| JP7714519B2 (ja) | 2025-07-29 |
| EP4109600A1 (en) | 2022-12-28 |
| AU2021224331B2 (en) | 2025-12-04 |
| TW202138300A (zh) | 2021-10-16 |
| AU2021224331A1 (en) | 2022-09-01 |
| TWI882070B (zh) | 2025-05-01 |
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