WO2024146478A1 - 正极材料及其制备方法、阴极极片、电极组件、电池和用电设备 - Google Patents
正极材料及其制备方法、阴极极片、电极组件、电池和用电设备 Download PDFInfo
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Definitions
- the radius of lithium ions is 76Pm. Cations larger than 76Pm can effectively form a supporting role in layered materials, enhance the stability of the layered structure and thus improve the cycle performance.
- the ionic radius of other cations is greater than 84Pm and less than 100Pm, and the ionic radius of other cations is in the range of 84Pm-100Pm, to ensure that other cations are effectively embedded in the layered structure, which can play a supporting role in the layered material, enhance the mixing energy barrier, alleviate the problem of aggravated mixing of metal ions and lithium ions in the layered cathode, enhance the stability of the layered structure and thus improve the cycle performance.
- the position where the lithium ions are located is defined as a lithium site, and the other cations occupy at least a portion of the lithium sites in the layered lithium-containing metal oxide structure.
- each element has its own arrangement position.
- the position of lithium ions in the layered lithium-containing metal oxide structure is defined as the lithium position, and other cations occupy at least part of the lithium position in the layered lithium-containing metal oxide structure.
- part of the lithium position of the layered positive electrode material is replaced with other cations with larger ion radius.
- the other cations have a large radius and occupy the lithium position stably, making it difficult for further mixing to occur. In this way, the stability of the layered structure is improved, and the replacement of lithium positions by other cations can effectively reduce the problem of lithium-nickel mixing.
- the other cationic elements include at least one of alkali metal elements, alkaline earth metal elements and non-metal elements except lithium element.
- other cation elements include at least one of alkali metal elements, alkaline earth metal elements, and non-metal elements other than lithium. It is understood that, in theory, any cation radius larger than that of lithium ions is acceptable, and metal ions are preferred.
- the alkaline earth metal element includes at least one of Ca and Sr;
- the non-metallic element includes Se.
- Lithium-nickel mixing refers to the phenomenon that the volume of divalent nickel ions is similar to that of lithium ions. When lithium ions are released in large quantities during discharge, they are affected by external factors and occupy positions in the lithium ion lattice. The dislocation of ions brings about changes in the lattice type, and its lithium insertion ability also changes accordingly.
- the positive electrode material can be a lithium-rich material, such as a lithium-rich manganese-based material.
- LixY (2-x) NiaCobMncM (1-abc) O2 0.6 ⁇ a ⁇ 1.0, 0.3 ⁇ b ⁇ 0.5, indicating that the positive electrode material is a high-nickel material.
- the use of high-nickel materials can effectively improve the energy density while effectively alleviating the problem of aggravated mixing of nickel ions and lithium ions in the layered cathode, improving the stability of the layered structure and thus improving the cycle performance.
- the positive electrode material can be a ternary material.
- the transition metal in the ternary material is easier to mix with lithium than other metals.
- 0 ⁇ x ⁇ 1 which means that in the general formula LixY (2-x) NiaCobMncM (1-abc) O2 , the content of other cations represented by Y is increased.
- the increase in the content of other cations is beneficial to increasing the mixing energy barrier, alleviating the problem of aggravated mixing of transition metal ions and lithium ions in the layered cathode, improving the stability of the layered structure and thus improving the cycle performance.
- the precursor, lithium salt and salt of other cations are mixed and calcined to obtain a layered lithium-containing metal oxide;
- the radius of other cations in the salt of other cations is larger than the radius of lithium ions.
- a metal salt is added to a solvent and stirred to obtain a metal salt solution; a precipitant is added to the metal salt solution to obtain a precursor; the precursor, a lithium salt and salts of other cations are mixed and calcined to obtain a layered lithium-containing metal oxide; wherein the radius of other cations in the salts of other cations is larger than the radius of lithium ions.
- a precipitant is used to precipitate a metal salt to obtain a precursor, and the precursor is mixed with a lithium salt and a salt of other cations, and calcined to obtain a layered lithium-containing metal oxide, wherein the radius of other cations in the salt of other cations is larger than the radius of lithium ions.
- cations in the positive electrode material are larger than the radius of lithium ions, and can play a supporting role in the layered material, enhance the mixing energy barrier, alleviate the problem of aggravated mixing of metal ions and lithium ions in the layered cathode, enhance the stability of the layered structure and thus improve the cycle performance.
- other cations in the positive electrode material can also be embedded in the negative electrode material, among which other cations with larger ionic radius play a supporting role in graphite, thereby reducing the expansion/contraction of graphite caused by ions with smaller ionic radius during the embedding/extraction process, which is beneficial to improve the stability of the SEI film, reduce the consumption of active lithium, and improve the cycle performance.
- the salt of other cations includes at least one of alkali metal salts, alkaline earth metal salts and non-metal salts.
- the types of salts of other cations are not limited in the present application, and the types of salts of other cations include at least one of alkali metal salts, alkaline earth metal salts, and non-metallic salts. It is understood that, in theory, the types of other cations can be any element with a larger radius than lithium ions, preferably metal ions.
- the step of adding a precipitant to the metal salt solution to obtain a precursor includes the following steps:
- a precipitant is added to the metal salt solution, reacted for 3 h to 20 h, and aged for 2 h to 12 h to obtain a precursor.
- reaction time of 3h-20h is the reaction time for generating primary particles. Since particles are broken during the reaction process, aging for 2h-12h can help the primary particle lattice repair and growth.
- the values include the minimum and maximum values of the range, and every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 3h, 5h, 8h, 10h, 14h, 16h, 18h, 20h, etc.
- the molar ratio of the precursor, lithium salt and other cation salts is defined as P:Q:R, then (Q+R)/P ⁇ 1.07 is satisfied.
- the excess lithium salt and other cation salts are to compensate for the loss of lithium and other cations during high-temperature calcination. Therefore, in the step of mixing the precursor, lithium salt and other cation salts, calcining and obtaining a layered lithium-containing metal oxide, lithium salt and other cation salts are added in excess.
- the calcination time of the calcination process is 17h-28h.
- the values include the minimum and maximum values of the range, and each value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 17h, 18h, 19h, 20h, 21h, 22h, 25h, 27h, 28h, etc.
- the calcination procedure of the calcination process is: heating from room temperature to 400-500°C at a heating rate of 3°C min -1 -5°C min -1 , pre-calcining for 5h-8h, then heating to 700-900°C, and calcining for 12h-20h.
- the metal salt comprises a transition metal salt
- the precipitant includes at least one of oxalate and carbonate.
- the metal salt is not limited in the present application, and can be, for example, a transition metal salt, for example, including at least one of a nickel salt, a cobalt salt and a manganese salt.
- the nickel salt is selected from one or more of nickel sulfate, nickel chloride, nickel nitrate and nickel acetate.
- the manganese salt is selected from one or more of manganese sulfate, manganese chloride, manganese nitrate and manganese acetate.
- the cobalt salt is selected from one or more of cobalt sulfate, cobalt chloride, cobalt nitrate and cobalt acetate.
- the precipitant may be at least one of oxalate and carbonate.
- oxalate is selected from one or more of sodium oxalate, sodium hydrogen oxalate, potassium oxalate, potassium hydrogen oxalate, ammonium oxalate and ammonium hydrogen oxalate.
- the carbonate is selected from one or more of sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, ammonium carbonate and ammonium bicarbonate.
- the cathode pole piece including the above positive electrode material has high cycle performance.
- the S and the K respectively satisfy the relationship: 10% ⁇ S ⁇ 90%, 0 ⁇ K ⁇ 10.
- the mass ratio of the positive electrode material in the coating to the overall positive electrode active material is 10% ⁇ S ⁇ 90%.
- the overall positive electrode active material also includes other active materials, for example, other ternary materials, in which the lithium sites are not replaced by other elements to increase the lithium capacity, thereby improving the energy density of the battery.
- the overall positive electrode active material in the coating accounts for 85%-99% of the total mass of the coating.
- the overall positive electrode active material in the coating accounts for 85%-99% of the total mass of the coating.
- the above 85%-99% includes the minimum and maximum values of the range, as well as every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 99%, etc.
- the compaction density of the cathode electrode sheet is in the range of 2.0 g/cm 3 -4.5 g/cm 3 .
- the volume density of the active layer will increase, the porosity will decrease, the specific surface area will increase, the contact resistance will decrease, the SEI impedance of the electrode electrolyte interface film will decrease, and the charge exchange impedance will decrease.
- a lower compaction density will instead cause the problem of low discharge specific capacity. This is mainly because the higher porosity causes some particles to form an insulating state and cannot participate in charging and discharging. Electrodes with high compaction density have higher fracture strength, thereby reducing the risk of electrode particles falling off and forming insulating particles during the cycle.
- the negative electrode material of the anode plate includes at least one of graphite, hard carbon and soft carbon.
- FIG1 is a schematic flow chart of a method for preparing a positive electrode material of the present application
- a lower limit and an upper limit are selected for limitation, and the selected lower limit and upper limit define the boundaries of a particular range.
- the range limited in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range.
- a range of 60 to 120 and 80 to 110 is listed for a specific parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected.
- the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5.
- Layered lithium-containing metal oxides include layered lithium-containing transition metal oxides.
- the transition metals in the layered lithium-containing transition metal oxides are more easily mixed with lithium than other metals. Including other cations with a larger radius than lithium ions in the layered lithium-containing transition metal oxides can effectively improve the stability of the layered structure.
- the position where the lithium ions are located is defined as the lithium site, and other cations occupy at least part of the lithium sites in the layered lithium-containing metal oxide structure.
- LixY (2-x) NiaCobMncM (1-abc) O2 0.6 ⁇ a ⁇ 1.0, 0.3 ⁇ b ⁇ 0.5, indicating that the positive electrode material is a high-nickel material.
- the use of high-nickel materials can effectively improve the energy density while effectively alleviating the problem of aggravated mixing of nickel ions and lithium ions in the layered cathode, improving the stability of the layered structure and thus improving the cycle performance.
- the positive electrode material can be a ternary material.
- the transition metal in the ternary material is easier to mix with lithium than other metals.
- 0 ⁇ x ⁇ 1 which means that in the general formula LixY (2-x) NiaCobMncM (1-abc) O2 , the content of other cations represented by Y is increased.
- the increase in the content of other cations is beneficial to increasing the mixing energy barrier, alleviating the problem of aggravated mixing of transition metal ions and lithium ions in the layered cathode, improving the stability of the layered structure and thus improving the cycle performance.
- the present application provides a method for preparing a positive electrode material, comprising the following steps: adding a metal salt to a solvent and stirring to obtain a metal salt solution; adding a precipitant to the metal salt solution to obtain a precursor; mixing the precursor, a lithium salt and salts of other cations, and calcining to obtain a layered lithium-containing metal oxide; wherein the radius of other cations in the salts of other cations is greater than the radius of lithium ions.
- the lithium salt is selected from one or more of lithium sulfate, lithium chloride, lithium nitrate, lithium acetate, lithium carbonate and lithium hydroxide.
- the metal salt is added to a solvent which includes water.
- the radius of other cations is greater than 76 Pm.
- the position where the lithium ions are located is defined as the lithium site, and other cations occupy at least part of the lithium sites in the layered lithium-containing metal oxide structure.
- each element has its own arrangement position.
- the position where the lithium ion is located is defined as the lithium site, and other cations occupy at least part of the lithium site in the layered lithium-containing metal oxide structure.
- part of the lithium site of the layered positive electrode material is replaced with other cations with a larger ion radius.
- the other cations have a large radius and occupy the lithium site stably, making it difficult for further mixing to occur. In this way, the stability of the layered structure is improved.
- the general formula of the layered lithium-containing metal oxide is Li x Y (2-x) Ni a Co b Mn c M (1-abc) O 2 , where Y represents other cations, and M includes at least one of Mg, Zr, Al, B, Ta, Mo, W, Nb, Sb, and La; wherein 0.3 ⁇ a ⁇ 1.0, 0 ⁇ b ⁇ 0.5, 0 ⁇ c ⁇ 0.2, a+b+c ⁇ 1, 0 ⁇ x ⁇ 2.
- a nickel-containing positive electrode material is used to improve the energy density.
- the positive electrode material contains other cations with a larger radius than the lithium ion, the problem of aggravated mixing of nickel ions and lithium ions in the layered cathode can be effectively alleviated, thereby improving the stability of the layered structure and thus improving the cycle performance.
- the types of salts of other cations include at least one of alkali metal salts, alkaline earth metal salts, and non-metal salts.
- the types of salts of other cations are not limited in the present application, and the types of salts of other cations include at least one of alkali metal salts, alkaline earth metal salts, and non-metallic salts. It is understood that, in theory, other cations can be elements with a larger radius than lithium ions, preferably metal ions.
- the step of adding a precipitant to a metal salt solution to obtain a precursor includes the following steps: adding a precipitant to a metal salt solution, reacting for 3h-20h, and aging for 2h-12h to obtain a precursor.
- reaction time of 3h-20h is the reaction time for generating primary particles. Since particles are broken during the reaction process, aging for 2h-12h can help the primary particle lattice repair and growth.
- the values include the minimum and maximum values of the range, and every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 3h, 5h, 8h, 10h, 14h, 16h, 18h, 20h, etc.
- the values include the minimum and maximum values of the range, and every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 2h, 3h, 5h, 8h, 10h, 12h, etc.
- the following steps are also included: adding a precipitant to the metal salt solution, reacting for 3h-20h, aging for 2h-12h, washing and drying the product to obtain a precursor.
- the drying temperature is 100°C-140°C
- the drying time is 12h-24h.
- the product is washed with deionized water 3 times, dried in a blast dryer, and then placed under vacuum at 100°C for 12h, and the dried solid is collected as the precursor.
- the molar ratio of the precursor, lithium salt and other cation salts is defined as P:Q:R, then (Q+R)/P ⁇ 1.07 is satisfied.
- the excess lithium salt and other cation salts are to compensate for the loss of lithium and other cations during high-temperature calcination. Therefore, in the step of mixing the precursor, lithium salt and other cation salts, calcining and obtaining a layered lithium-containing metal oxide, lithium salt and other cation salts are added in excess, that is, the molar ratio of the precursor, lithium salt and other cation salts is defined as P:Q:R, then (Q+R)/P ⁇ 1.07 is satisfied.
- the calcination time of the calcination process is 17h-28h.
- the values include the minimum and maximum values of the range, and each value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 17h, 18h, 19h, 20h, 21h, 22h, 25h, 27h, 28h, etc.
- the heating rate can be 3°C min -1 , 4°C min -1 , 5°C min -1 , and at room temperature, the temperature is increased to 400°C, 450°C or 500°C at a certain heating rate, pre-calcined for 5h, 6h, 7h or 8h, and then the temperature is increased to 700°C, 800°C or 900°C, and calcined for 12h, 13h, 14h, 15h, 16h, 18h, 19h or 20h.
- the metal salt is not limited in the present application, and can be, for example, a transition metal salt, such as at least one of a nickel salt, a cobalt salt and a manganese salt.
- the nickel salt is selected from one or more of nickel sulfate, nickel chloride, nickel nitrate and nickel acetate.
- the manganese salt is selected from one or more of manganese sulfate, manganese chloride, manganese nitrate and manganese acetate.
- the cobalt salt is selected from one or more of cobalt sulfate, cobalt chloride, cobalt nitrate and cobalt acetate.
- the positive electrode material adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.
- the cathode electrode sheet including the above positive electrode material has high cycle performance.
- the compaction density is directly proportional to S.
- the greater the compaction density the more positive electrode material is required.
- the greater the compaction density the smaller the material gap becomes. In order to expand the gap, more other cations with a larger radius than lithium are needed to support the material layer.
- the values include the minimum and maximum values of the range, and every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 0.5%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, etc.
- the values include the minimum and maximum values of the range, and every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiment and 0.5, 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 99, etc.
- S and K satisfy the relationship: 10% ⁇ S ⁇ 90%, 0 ⁇ K ⁇ 10 respectively.
- the mass ratio of the positive electrode material to the overall positive electrode active material satisfies 10% ⁇ S ⁇ 90%, that is, the doping amount is >10%
- the amount of large-radius ions in the positive electrode material is sufficient to support the positive electrode material interlayer, and the excess ions can escape and embed into graphite to reduce expansion.
- the values include the minimum and maximum values of the range, and every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 11%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, etc.
- the values include the minimum and maximum values of the range, and every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, etc.
- the overall positive electrode active material in the coating accounts for 85%-99% of the total mass of the coating.
- the compaction density of the cathode electrode sheet is in the range of 2.0 g/cm 3 -4.5 g/cm 3 .
- Compacted density, compacted density surface density / (thickness of the pole piece after rolling - thickness of the current collector), unit: g/cm 3 .
- the volume density of the active layer will increase, the porosity will decrease, the specific surface area will increase, the contact resistance will decrease, the SEI impedance of the electrode electrolyte interface film will decrease, and the charge exchange impedance will decrease.
- a lower compaction density will instead cause the problem of low discharge specific capacity. This is mainly because the higher porosity causes some particles to form an insulating state and cannot participate in charging and discharging. Electrodes with high compaction density have higher fracture strength, thereby reducing the risk of electrode particles falling off and forming insulating particles during the cycle.
- High compaction density can significantly make the distribution of the pore size and pores of the electrode more uniform, the distribution of the conductive agent and the binder more uniform, reduce the contact resistance and charge exchange impedance of the electrode, and increase the active area that can participate in the reaction, thereby significantly improving the electrochemical performance of the material.
- the compaction density of the cathode electrode sheet ranges from 2.0 g/cm 3 to 4.5 g/cm 3 .
- the values include the minimum and maximum values of the range, and each value between the minimum and maximum values.
- Specific examples include but are not limited to the point values in the embodiment and 2.0 g/cm 3 , 2.2 g/cm 3 , 2.4 g/cm 3 , 2.8 g/cm 3 , 2.9 g/cm 3 , 3.0 g/cm 3 , 3.1 g/cm 3 , 3.2 g/cm 3 , 3.3 g/cm 3 , 3.4 g/cm 3 , 3.5 g/ cm 3 , 3.6 g/cm 3 , 3.7 g/cm 3 , 3.8 g/cm 3 , 3.9 g / cm 3 , 4.0 g/cm 3 , 4.2g/cm 3 , 4.4g/cm 3 , 4.5g/cm 3 , etc.
- the compaction density of the cathode electrode sheet is preferably in the range of 2.8 g/cm 3 -3.5 g/cm 3 .
- the compaction density of the cathode electrode sheet ranges from 2.8 g/cm 3 to 3.5 g/cm 3 .
- the values include the minimum and maximum values of the range, and every value between the minimum and maximum values. Specific examples include but are not limited to the point values in the embodiments and 2.8 g/cm 3 , 2.9 g/cm 3 , 3.0 g/cm 3 , 3.1 g/cm 3 , 3.2 g/cm 3 , 3.3 g/cm 3 , 3.4 g/cm 3 , 3.5 g/cm 3 and the like.
- the negative electrode material of the anode plate includes at least one of graphite, hard carbon and soft carbon.
- FIG4 is a battery module 4 as an example.
- a plurality of battery cells 5 may be arranged in sequence along the length direction of the battery module 4. Of course, they may also be arranged in any other manner. Further, the plurality of battery cells 5 may be fixed by fasteners.
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Abstract
Description
Claims (26)
- 一种正极材料,其中,所述正极材料包括层状含锂金属氧化物,所述层状含锂金属氧化物中包括比锂离子半径大的其他阳离子。
- 如权利要求1所述的正极材料,其中,所述层状含锂金属氧化物包括层状含锂过渡金属氧化物;和/或所述其他阳离子的离子半径大于76Pm。
- 如权利要求1或2所述的正极材料,其中,所述其他阳离子的离子半径大于84Pm,小于100Pm。
- 如权利要求1至3中任一项所述的正极材料,其中,定义所述层状含锂金属氧化物结构中,所述锂离子所在的位置为锂位,所述其他阳离子在所述层状含锂金属氧化物结构中占据至少部分所述锂位。
- 如权利要求1至4中任一项所述的正极材料,其中,所述其他阳离子元素包括除锂元素以外的碱金属元素、碱土金属元素、非金属元素中的至少一种。
- 如权利要求5所述的正极材料,其中,所述碱金属元素包括Na、K、Rb、Cs中的至少一种;所述碱土金属元素包括Ca,Sr中的至少一种;所述非金属元素包括Se。
- 如权利要求1至6中任一项所述的正极材料,其中,所述层状含锂金属氧化物的通式为LixY(2-x)NiaCobMncM(1-a-b-c)O2,Y代表所述其他阳离子,M包括Mg、Zr、Al、B、Ta、Mo、W、Nb、Sb、La中的至少一种;其中,0.3≤a<1.0,0<b<0.5,0≤c≤0.2,a+b+c≤1,0<x<2。
- 如权利要求7所述的正极材料,其中,0.6≤a<1.0,0.3<b<0.5。
- 如权利要求7或8所述的正极材料,其中,0<x<1。
- 一种如权利要求1至9中任一项所述的正极材料的制备方法,其中,包括以下步骤:将金属盐加入溶剂中,搅拌,得到金属盐溶液;向所述金属盐溶液中加入沉淀剂,得到前驱体;将所述前驱体、锂盐和其他阳离子的盐混合,煅烧,得到层状含锂金属氧化物;其中,所述其他阳离子的盐中的其他阳离子的半径大于锂离子半径。
- 如权利要求10所述的正极材料的制备方法,其中,所述其他阳离子的盐的种类包括碱金属盐、碱土金属盐、非金属盐中的至少一种。
- 如权利要求10或11所述的正极材料的制备方法,其中,在向所述金属盐溶液中加入沉淀剂,得到前驱体的步骤中,包括以下步骤;向所述金属盐溶液中加入沉淀剂,反应3h-20h,陈化2h-12h,得到前驱体。
- 如权利要求10至12中任一项所述的正极材料的制备方法,其中,在将所述前驱体、锂盐和其他阳离子的盐混合,煅烧,得到层状含锂金属氧化物的步骤中,定义所述前驱体、锂盐和其他阳离子的盐的摩尔比为P:Q:R,则满足(Q+R)/P≥1.07。
- 如权利要求10至13中任一项所述的正极材料的制备方法,其中,所述煅烧过程的煅烧时间为17h-28h。
- 如权利要求10至14中任一项所述的正极材料的制备方法,其中,所述煅烧过程的煅烧程序为:以3℃min-1-5℃min-1的升温速率,从室温升至400℃-500℃,预煅烧5h-8h,再升温至700℃-900℃,煅烧12h-20h。
- 如权利要求10至15中任一项所述的正极材料的制备方法,其中,所述金属盐包括过渡金属盐;和/或,所述沉淀剂包括草酸盐和碳酸盐中的至少一种。
- 一种阴极极片,其中,所述阴极极片包括集流体及设置在所述集流体上的涂层,所述涂层包括如权利要求1至9中任一项所述的正极材料,或,所述涂层包括如权利要求10至16中任一项所述的正极材料的制备方法制得的正极材料。
- 如权利要求17所述的阴极极片,其中,所述阴极极片的压实密度Pd满足如下关系:Pd=S*K,其中,S为所述涂层中所述正极材料占整体正极活性材料的质量比,K为系数,0<S≤100%,0<K<100。
- 如权利要求18所述的阴极极片,其中,10%<S≤90%,0<K<10。
- 如权利要求18或19所述的阴极极片,其中,所述涂层中整体正极活性材料占所述涂层总质量的85%-99%。
- 如权利要求18至20中任一项所述的阴极极片,其中,所述阴极极片的压实密度范围值为2.0g/cm3-4.5g/cm3。
- 如权利要求18至21中任一项所述的阴极极片,其中,所述阴极极片的压实密度范围值为2.8g/cm3-3.5g/cm3。
- 一种电极组件,其中,所述电极组件包括阳极极片、隔膜以及权利要求17至22中任一项所述的阴极极片。
- 如权利要求23所述的电极组件,其中,所述阳极极片的负极材料包括石墨、硬碳和软碳中的至少一种。
- 一种电池,其中,包括如权利要求23或24所述的电极组件。
- 一种用电设备,其中,所述用电设备包括权利要求25所述的电池。
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| EP23914609.5A EP4589709A4 (en) | 2023-01-05 | 2023-12-29 | POSITIVE ELECTRODE MATERIAL, ITS PREPARATION PROCESS, CATHODE ELECTRODE SHEET, ELECTRODE ASSEMBLY, BATTERY AND ELECTRICAL DEVICE |
| US19/192,356 US20250256985A1 (en) | 2023-01-05 | 2025-04-29 | Positive electrode material and preparation method thereof, negative electrode plate, electrode assembly, battery, and electric device |
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| WO2026044552A1 (zh) * | 2024-08-28 | 2026-03-05 | 万华化学(烟台)电池材料科技有限公司 | 正极活性材料及其制备方法和应用 |
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| WO2026025391A1 (zh) * | 2024-07-31 | 2026-02-05 | 宁德时代新能源科技股份有限公司 | 电池单体、电池装置和用电装置 |
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| EP4589709A4 (en) | 2026-02-25 |
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| CN118299526B (zh) | 2026-01-13 |
| US20250256985A1 (en) | 2025-08-14 |
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