CN112151794A - Positive plate capable of discharging at high rate and lithium ion battery comprising same - Google Patents
Positive plate capable of discharging at high rate and lithium ion battery comprising same Download PDFInfo
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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
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- 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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- 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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- 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
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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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
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Abstract
The invention provides a positive plate capable of discharging at a high rate and a lithium ion battery comprising the positive plate. According to the invention, a first positive active material (polycrystal nickel-containing ternary material) and a second positive active material (monocrystal or monocrystal-like nickel-containing ternary material) are mixed to prepare a positive active material layer, the arrangement of the positive active material layer can reduce the coating amount and simultaneously improve the rate capability of the lithium ion battery, or the energy density of the lithium ion battery is increased while ensuring the rate capability of the lithium ion battery, in addition, the characteristics of better stability and relatively smaller contact area with an electrolyte of the second positive active material can be utilized to reduce the occurrence of side reactions in the large-rate discharge process, reduce the risk of gas generation failure, and simultaneously ensure the quick discharge performance of a system.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive plate capable of discharging at a high rate and a lithium ion battery comprising the positive plate.
Background
With the expansion of the demand field of the consumer market for the lithium ion battery, the lithium ion battery is required to have higher power density and discharge rate, but the increase of the discharge rate will increase the temperature rise of the lithium ion battery during discharge, and in order to ensure that the electrolyte has sufficiently high ionic conductivity, the lithium ion battery discharged with high rate mostly adopts a solvent with lower viscosity, and the boiling point of the solvent with low viscosity is relatively lower.
Meanwhile, the positive plate in the lithium ion battery with high-rate discharge adopts the design of low compaction and high residual liquid amount to ensure enough electrolyte in the later cycle process, and ternary materials with small particle size and high specific surface area are additionally selected for reducing the polarization in the discharge process.
However, this poses a serious problem: when the battery cell is discharged at a large multiplying power, the temperature of the battery cell body is high, so that the low-boiling-point solvent is decomposed to generate gas, the contact area between the ternary material with a high specific surface area and the electrolyte is large, side reactions are easier to occur, and potential safety hazards can be brought when the battery cell fails.
Disclosure of Invention
The invention provides a positive plate capable of discharging at a high rate and a lithium ion battery comprising the positive plate, wherein a first positive active material (a polycrystal nickel-containing ternary material) and a second positive active material (a monocrystal or monocrystal-like nickel-containing ternary material) are mixed to prepare a positive active material layer, the arrangement of the positive active material layer can reduce the coating amount and simultaneously improve the rate capability of the lithium ion battery, or ensure the rate capability of the lithium ion battery and simultaneously increase the energy density of the lithium ion battery, in addition, the characteristics of better stability and relatively smaller contact area with an electrolyte of the second positive active material can be utilized to reduce the occurrence of side reactions in the process of discharging at the high rate, reduce the risk of gas generation failure, and simultaneously ensure the quick-discharge performance of a system.
The purpose of the invention is realized by the following technical scheme:
a positive plate comprises a positive current collector and a positive active material layer coated on the first surface of the positive current collector; the positive electrode active material layer includes a first positive electrode active material and a second positive electrode active material; the first positive active substance is a modified or unmodified polycrystalline nickel-containing ternary material, and the second positive active substance is a modified or unmodified single crystal or single crystal-like nickel-containing ternary material; the content of nickel in the single crystal or single-crystal-like nickel-containing ternary material is larger than that of nickel in the polycrystalline nickel-containing ternary material.
In the invention, the content of nickel refers to the molar content of nickel in the ternary material.
According to the present invention, a positive electrode active material layer is coated on a second surface of a positive electrode current collector opposite to a first surface; the first positive active substance is a modified or unmodified polycrystalline nickel-containing ternary material, and the second positive active substance is a modified or unmodified single crystal or single crystal-like nickel-containing ternary material; the content of nickel in the single crystal or single-crystal-like nickel-containing ternary material is larger than that of nickel in the polycrystalline nickel-containing ternary material.
According to the invention, the modification comprises doping and/or cladding.
Specifically, the doping refers to doping other elements in the bulk phase or on the surface of the ternary material, wherein the other elements are at least one of Mg, Al, Fe, Cd, Zr, Mo, Zn, V, Ag and Ti, and the doping amount of the other elements accounts for 0.1-1.5% of the total molar amount of the three elements (such as Ni, Co and Mn) in the ternary material.
Specifically, the coating is to coat a coating layer on the surface of the ternary material, the coating layer is a metal oxide, the element contained in the metal oxide is at least one of Mg, Al, Fe, Cd, Zr, Mo, Zn, V, Ag and Ti, or the coating layer is a carbon layer, and the mass of the coating layer accounts for 0.1-2.5% of the total mass of the three elements (such as Ni, Co and Mn) in the ternary material.
According to the invention, the chemical formula of the polycrystalline nickel-containing ternary material is Li (Ni)x1Coy1Mnz1)O2Wherein x is1+y1+z1＝1,0.2<x1<0.8,0<y1<0.3,0<z1<0.3。
According to the invention, the chemical formula of the single crystal or single crystal-like nickel-containing ternary material is Li (Ni)x2Coy2Mnz2)O2Wherein x is2+y2+z2＝1,0.3<x2<0.9,0<y2<0.3,0<z2<0.3, and x2>x1。
Illustratively, the chemical formula of the polycrystalline nickel-containing ternary material is Li (Ni)0.5Co0.2Mn0.3)O2、Li(Ni0.6Co0.2Mn0.2)O2、Li(Ni1/3Co1/3Mn1/3)O2(ii) a The chemical formula of the single crystal or single crystal-like nickel-containing ternary material is Li (Ni)0.5Co0.2Mn0.3)O2、Li(Ni0.6Co0.2Mn0.2)O2、Li(Ni0.8Co0.1Mn0.1)O2And the content of nickel in the single crystal or single crystal-like nickel-containing ternary material is greater than that in the polycrystalline nickel-containing ternary material.
According to the present invention, the polycrystal means a spheroidal secondary particle formed by agglomeration of a plurality of primary particles; the single crystal refers to a particle composed of a single primary particle; the mono-like crystal refers to secondary particle particles formed by agglomeration of a small amount of primary particles.
According to the present invention, the specific surface area of the first positive electrode active material is larger than the specific surface area of the second positive electrode active material.
According to the present invention, the specific surface area of the first positive electrode active material is 0.5 to 0.9m2/g。
According to the present invention, the specific surface area of the second positive electrode active material is 0.4 to 0.7m2/g。
According to the present invention, the particle diameter of the first positive electrode active material satisfies 0 μm<D1 10<4μm，3μm<D1 50<8μm，6μm<D1 90<12μm。
According to the present invention, the particle diameter of the second positive electrode active material satisfies 0 μm<D2 10<4μm，3μm<D2 50<8μm，6μm<D2 90<12μm。
According to the present invention, the gram capacity of the second positive electrode active material is higher than the gram capacity of the first positive electrode active material.
According to the present invention, the gram capacity of the first positive electrode active material is 140-190 mAh/g.
According to the present invention, the gram capacity of the second positive electrode active material is 145-200 mAh/g.
According to the present invention, the mass ratio of the first positive electrode active material to the second positive electrode active material is 50 to 90:10 to 50, for example, 50:50, 60:40, 70:30, 80:20, or 90: 10.
According to the present invention, the positive electrode active material layer further includes a conductive agent and a binder.
According to the invention, the positive active material layer comprises the following components in percentage by mass:
70-99 wt% of positive electrode active material, 0.5-15 wt% of conductive agent and 0.5-15 wt% of binder, wherein the positive electrode active material comprises a first positive electrode active material and a second positive electrode active material, and the mass ratio of the first positive electrode active material to the second positive electrode active material is 50-90: 10-50.
According to the invention, the positive active material layer comprises the following components in percentage by mass:
80-98 wt% of positive electrode active material, 1-10 wt% of conductive agent and 1-10 wt% of binder.
According to the invention, the positive active material layer comprises the following components in percentage by mass:
84-96 wt% of positive electrode active material, 2-8 wt% of conductive agent and 2-8 wt% of binder.
According to the invention, the conductive agent is at least one selected from conductive carbon black, acetylene black, ketjen black, conductive carbon fiber, carbon nanotube and graphene.
According to the invention, the binder is selected from at least one of polyvinylidene fluoride (PVDF), Polytetrafluoroethylene (PTFE), polyvinylidene fluoride-hexafluoropropylene, lithium polyacrylate (PAA-Li).
According to the invention, the thickness of the positive electrode active material layer is 60 to 130 μm, preferably 70 to 110 μm, such as 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm.
According to the invention, the positive current collector is an aluminum foil, or a porous aluminum foil or a foil with the surface subjected to modification treatment and coated with a modified material.
According to the invention, the surface density (coating amount per unit area) of the positive electrode sheet is less than or equal to 16mg/cm2。
The invention also provides a preparation method of the positive plate, which comprises the following steps:
1) respectively preparing slurry for forming a positive electrode active material layer, wherein the slurry comprises a first positive electrode active material and a second positive electrode active material;
2) and coating the slurry for forming the positive active material layer on the first surface of the positive current collector by using a coating machine, and drying to prepare the positive plate.
In one embodiment of the present invention, in step 1), the solid content of the slurry for forming a positive electrode active material layer is 65 to 80 wt%.
In one embodiment of the present invention, in step 1), the viscosity of the slurry for forming the positive electrode active material layer is 4500-.
In one embodiment of the present invention, in step 2), the slurry for forming the positive electrode active material layer is coated on a second surface of the positive electrode current collector opposite to the first surface, and dried to prepare the positive electrode sheet.
The invention also provides a lithium ion battery which comprises the positive plate.
The invention has the beneficial effects that:
the invention provides a positive plate capable of discharging at a high rate and a lithium ion battery comprising the positive plate. According to the invention, a first positive active substance (polycrystal nickel-containing ternary material) and a second positive active substance (monocrystal or monocrystal-like nickel-containing ternary material) are mixed to prepare a positive active substance layer, the cobalt content in the first positive active substance is higher, the conductivity and safety performance of the lithium ion battery can be improved, and meanwhile, the polycrystal structure can also keep the battery in good rate capability, so that the battery can have better safety performance and rate capability by selecting the polycrystal nickel-containing ternary material; the positive active material layer can reduce the coating amount and improve the rate capability of the lithium ion battery, or increase the energy density of the lithium ion battery while ensuring the rate capability of the lithium ion battery, and in addition, the second positive active material has the characteristics of high nickel content, high gram capacity, small specific surface area, good stability and relatively smaller contact area with electrolyte, so that the occurrence of side reaction in the large-rate discharge process is reduced, the risk of gas generation failure is reduced, and the quick release performance of a system can be ensured.
In conclusion, the use of the positive plate of the invention can improve the cycle performance of the lithium ion battery, improve the high-temperature storage performance of the lithium ion battery, and support 20C discharge.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; reagents, materials and the like used in the following examples are commercially available unless otherwise specified.
In the description of the present invention, it should be noted that the terms "first", "second", etc. are used for descriptive purposes only and do not indicate or imply relative importance.
In the description of the present invention, it should be noted that the ternary material refers to a positive electrode material containing three transition metal elements of nickel, manganese and cobalt.
Polycrystalline nickel-containing ternary Material Li (Ni) in examples and comparative examples described below0.5Co0.2Mn0.3)O2The single crystal nickel-containing ternary material Li (Ni), which is marked as polycrystalline ternary 523 material0.6Co0.2Mn0.2)O2The single crystal-like nickel-containing ternary material Li (Ni) is marked as a single crystal ternary 622 material0.8Co0.1Mn0.1)O2The material is marked as a monocrystal-like ternary 811 material, and a monocrystal nickel-containing ternary Li (Ni)0.5Co0.2Mn0.3)O2Materials described as single crystal ternary 523, and polycrystalline nickel-containing ternary Li (Ni)0.6Co0.2Mn0.2)O2And designated as polycrystalline ternary 622 material, were obtained after commercial purchase, with specific parameters as set forth in the table below.
| Particle size | Specific surface area | ||
| Polycrystalline ternary 523 materialMaterial | Li(Ni0.5Co0.2Mn0.3)O2 | D10:2.21μm；D50:4.77μm；D90:7.52μm | 0.631m2/g |
| Polycrystalline ternary 622 material | Li(Ni0.6Co0.2Mn0.2)O2 | D10:2.45μm；D50:5.03μm；D90:8.17μm | 0.607m2/g |
| Single crystal ternary 622 material | Li(Ni0.6Co0.2Mn0.2)O2 | D10:2.65μm；D50:4.62μm；D90:7.90μm | 0.575m2/g |
| Single crystal like ternary 811 material | Li(Ni0.8Co0.1Mn0.1)O2 | D10:2.89μm；D50:4.71μm；D90:8.13μm | 0.562m2/g |
| Single crystal ternary 523 material | Li(Ni0.5Co0.2Mn0.3)O2 | D10:2.41μm；D50:4.54μm；D90:8.21μm | 0.557m2/g |
Example 1
Preparing positive active substance slurry, mixing 94% by mass of positive active substances (70% by mass of polycrystalline ternary 523 positive electrode material and 30% by mass of single crystal ternary 622 positive electrode material), 3.5% by mass of conductive agent (conductive carbon black), 2.5% by mass of binder (polyvinylidene fluoride) and NMP to prepare slurry with the solid content of 65-70 wt% and the viscosity of 5500-.
Preparing negative active substance slurry, mixing 95% of negative active substance (artificial graphite), 2.8% of conductive agent (conductive carbon black) and 2.2% of binder (polyvinylidene fluoride) with deionized water to prepare slurry with the solid content of 45-50 wt% and the viscosity of 3500-.
And preparing the positive and negative pole pieces and the diaphragm into a pole group in a lamination mode, packaging by using an aluminum plastic film, drying to remove moisture, injecting required electrolyte, and completing formation by using a proper formation process to obtain the soft package battery.
Examples 2 to 5 and comparative examples 1 to 3
The other examples were the same as example 1 except that the selection of the positive electrode active material was different and the coating amount was different, and are specifically shown in table 1.
Table 1 composition of positive electrode active material in lithium ion batteries of examples and comparative examples
Methods for testing the properties of examples and comparative examples:
1. the batteries prepared in the above examples and comparative examples were stored while being left at 80 c, and the time during which gassing (slight swelling of the battery was observed visually) occurred was recorded, and the results are shown in table 2.
2. The batteries prepared in the above examples and comparative examples were subjected to 2C charging at room temperature, 10C discharge cycle test, and the capacity retention rate and cell gassing after 500 cycles were recorded, with the results shown in table 2.
3. The batteries prepared in the above examples and comparative examples were subjected to 0.5C charge and discharge calibration discharge energy E (Wh), and m (Kg) was weighed, and their energy densities WED (Wh/Kg) ═ E/m.
4. The cells prepared in the above examples and comparative examples were subjected to 1C charging, rate discharge tests of 1C to 20C, and the discharge capacity at different rates was recorded, with the results shown in table 3.
Table 2 high-temperature storage and normal-temperature cycle properties of the batteries prepared in examples and comparative examples
TABLE 3 Rate Properties of batteries prepared in examples and comparative examples
As can be seen from the above tables 2-3, adding a part of single crystal or quasi-single crystal nickel-containing ternary material with higher nickel content into the rate type polycrystalline nickel-containing ternary material can prolong the cycle life and improve the high-temperature storage performance. For example: compared with the comparative example 1, the unit coating amount design of the example 1 is the same, the prepared battery cell ED is improved, and the high-temperature storage performance is also obviously improved. Examples 2 to 5 compared with comparative example 1, the coating amount was reduced with the same ED, the rate capability was comparable to comparative example 1, and the high temperature storage performance was improved.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The positive plate comprises a positive current collector and a positive active material layer coated on the first surface of the positive current collector; the positive electrode active material layer includes a first positive electrode active material and a second positive electrode active material; the first positive active substance is a modified or unmodified polycrystalline nickel-containing ternary material, and the second positive active substance is a modified or unmodified single crystal or single crystal-like nickel-containing ternary material; the content of nickel in the single crystal or single-crystal-like nickel-containing ternary material is larger than that of nickel in the polycrystalline nickel-containing ternary material.
2. The positive electrode sheet according to claim 1, wherein a positive electrode active material layer is coated on a second surface of the positive electrode collector opposite to the first surface; the first positive active substance is a modified or unmodified polycrystalline nickel-containing ternary material, and the second positive active substance is a modified or unmodified single crystal or single crystal-like nickel-containing ternary material; the content of nickel in the single crystal or single-crystal-like nickel-containing ternary material is larger than that of nickel in the polycrystalline nickel-containing ternary material.
3. The positive electrode sheet according to claim 1 or 2, wherein the modification comprises doping and/or coating;
preferably, the doping refers to doping other elements in the bulk phase or on the surface of the ternary material, the other elements are at least one of Mg, Al, Fe, Cd, Zr, Mo, Zn, V, Ag and Ti, and the doping amount of the other elements accounts for 0.1-1.5% of the total molar amount of the three elements in the ternary material;
preferably, the coating is to coat a coating layer on the surface of the ternary material, the coating layer is a metal oxide, the element contained in the metal oxide is at least one of Mg, Al, Fe, Cd, Zr, Mo, Zn, V, Ag and Ti, or the coating layer is a carbon layer, and the mass of the coating layer accounts for 0.1-2.5% of the total mass of the three elements in the ternary material.
4. The positive electrode sheet according to any one of claims 1 to 3, wherein the polycrystalline nickel-containing ternary material has a chemical formula of Li (Ni)x1Coy1Mnz1)O2Wherein x is1+y1+z1＝1,0.2<x1<0.8,0<y1<0.3,0<z1<0.3; and/or the presence of a gas in the gas,
the chemical formula of the single crystal or single crystal-like nickel-containing ternary material is Li (Ni)x2Coy2Mnz2)O2Wherein x is2+y2+z2＝1,0.3<x2<0.9,0<y2<0.3,0<z2<0.3, and x2>x1。
5. The positive electrode sheet according to any one of claims 1 to 4, wherein the polycrystalline nickel-containing ternary material has a chemical formula of Li (Ni)0.5Co0.2Mn0.3)O2、Li(Ni0.6Co0.2Mn0.2)O2Or Li (Ni)1/3Co1/3Mn1/3)O2(ii) a The chemical formula of the single crystal or single crystal-like nickel-containing ternary material is Li (Ni)0.5Co0.2Mn0.3)O2、Li(Ni0.6Co0.2Mn0.2)O2Or Li (Ni)0.8Co0.1Mn0.1)O2And the content of nickel in the single crystal or quasi-single crystal nickel-containing ternary material is higher than that in the polycrystal nickel-containing ternary material.
6. The positive electrode sheet according to any one of claims 1 to 5, wherein the specific surface area of the first positive electrode active material is larger than the specific surface area of the second positive electrode active material; and/or the presence of a gas in the gas,
the specific surface area of the first positive electrode active material is 0.5 to 0.9m2(ii)/g; and/or the presence of a gas in the gas,
the specific surface area of the second positive electrode active material is 0.4 to 0.7m2(ii)/g; and/or the presence of a gas in the gas,
the particle diameter of the first positive electrode active material satisfies 0 [ mu ] m<D1 10<4μm，3μm<D1 50<8μm，6μm<D1 90<12 μm; and/or the presence of a gas in the gas,
the particle diameter of the second positive electrode active material satisfies 0 [ mu ] m<D2 10<4μm，3μm<D2 50<8μm，6μm<D2 90<12μm。
7. The positive electrode sheet according to any one of claims 1 to 6, wherein the gram capacity of the second positive electrode active material is higher than the gram capacity of the first positive electrode active material; and/or the presence of a gas in the gas,
the gram capacity of the first positive active material is 140-190 mAh/g; and/or the presence of a gas in the gas,
the gram capacity of the second positive electrode active material is 145-200 mAh/g.
8. The positive electrode sheet according to any one of claims 1 to 7, wherein the positive electrode active material layer further comprises a conductive agent and a binder, and the positive electrode active material layer comprises the following components in percentage by mass:
70-99 wt% of positive electrode active material, 0.5-15 wt% of conductive agent and 0.5-15 wt% of binder, wherein the positive electrode active material comprises a first positive electrode active material and a second positive electrode active material, and the mass ratio of the first positive electrode active material to the second positive electrode active material is 50-90: 10-50.
9. The positive electrode sheet according to any one of claims 1 to 8, wherein the thickness of the positive electrode active material layer is 60 to 130 μm.
10. A lithium ion battery comprising the positive electrode sheet according to any one of claims 1 to 9.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422044A (en) * | 2021-06-23 | 2021-09-21 | 中国第一汽车股份有限公司 | Lithium ion battery and preparation method thereof |
| CN114583150A (en) * | 2022-02-21 | 2022-06-03 | 远景动力技术(江苏)有限公司 | Positive electrode active material and use thereof |
| WO2022198891A1 (en) * | 2021-06-30 | 2022-09-29 | 北京当升材料科技股份有限公司 | Positive electrode material and preparation method and use therefor, lithium-ion battery positive electrode pole piece, and lithium-ion battery |
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| CN116014072A (en) * | 2023-03-27 | 2023-04-25 | 中创新航材料科技(四川)有限公司 | Battery cell |
| CN116588995A (en) * | 2023-07-17 | 2023-08-15 | 宁德时代新能源科技股份有限公司 | Echelon utilization method of waste ternary cathode material |
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