CN111653732A - Positive electrode material, positive electrode plate and lithium ion battery - Google Patents
Positive electrode material, positive electrode plate and lithium ion battery Download PDFInfo
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- CN111653732A CN111653732A CN201910159804.9A CN201910159804A CN111653732A CN 111653732 A CN111653732 A CN 111653732A CN 201910159804 A CN201910159804 A CN 201910159804A CN 111653732 A CN111653732 A CN 111653732A
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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
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
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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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
Abstract
In order to solve the problems of insufficient compaction density and safety performance of the conventional high-nickel ternary cathode material of the lithium ion battery, the invention provides a cathode material which comprises a cathode active material, wherein the cathode active material comprises a secondary spherical nickel-cobalt-manganese ternary material and a single crystal type nickel-cobalt-manganese ternary material which are mixed with each other, and the molar ratio of the secondary spherical nickel-cobalt-manganese ternary material to the single crystal type nickel-cobalt-manganese ternary material is 1: 1-9: 1. Meanwhile, the invention also discloses a positive pole piece and a lithium ion battery comprising the positive pole material. The positive electrode material provided by the invention not only ensures the advantage of high gram capacity of the nickel-cobalt-manganese ternary material, but also has good structural stability, overcomes the defects of easy crushing and low thermal decomposition temperature of the nickel-cobalt-manganese ternary material, and has higher thermal stability and higher compaction density.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive electrode material, a positive electrode plate and a lithium ion battery.
Background
A lithium ion battery is a secondary battery that operates by migration of lithium ions between positive and negative electrodes. As an efficient energy storage device, a lithium ion battery is widely used in the fields of consumer electronics, new energy vehicles, energy storage, and the like. Currently, most of the lithium ion battery positive electrode materials studied include lithium cobaltate, lithium nickel cobalt manganese oxide ternary materials, lithium nickel cobalt aluminate ternary materials, lithium manganese oxide, lithium iron phosphate and the like.
In the field of new energy automobile power batteries, the most widely applied are lithium iron phosphate and ternary materials. The lithium iron phosphate has the advantages of high safety, long cycle life and the like, but the application of the lithium iron phosphate in the field of new energy passenger vehicles is limited by the defects of low gram capacity, low conductivity, poor low-temperature performance and the like. At present, ternary materials (including lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminate) are widely applied to power batteries of new energy passenger vehicles.
With the increasing requirement on the energy density of the battery, the content of nickel element in the used ternary material is increased. In the ternary material, the gram capacity of the material can be effectively improved by increasing the content of nickel, but the defects of poor safety, poor structural stability, poor cycle life and the like are caused. In addition, in order to meet the demand of the power cell for the volume energy density, the compaction density of the positive electrode material in the lithium ion battery is also continuously increased.
In order to improve the structural stability, safety and compaction performance of the high-nickel ternary material, the existing high-nickel material is mixed with other types of anode materials or high-nickel ternary materials with different particle sizes for use, and a plurality of defects of the high-nickel ternary material in the application process can be improved to a certain extent.
In the existing technical scheme, the blending use scheme based on the high-nickel anode material can be divided into two categories:
(1) for example, in patent CN 104993121, the high nickel ternary material is mixed with lithium manganate to improve the safety performance of the material, but due to the low theoretical gram-volume of lithium manganate and lithium iron phosphate, the energy density of the original ternary material system can be reduced by adopting the technical scheme.
(2) The lithium manganese cobalt oxide powder is mixed with a secondary spherical ternary material with small particle size, for example, in patent CN 103904310, the lithium manganese nickel cobalt oxide material with two particle sizes is mixed for use, so that the compaction density of the material can be improved to a certain extent, but the safety is not obviously improved; if a high-nickel ternary material with small particle size is adopted during mixing, the side reaction of the material and the electrolyte is aggravated, and the safety of the battery cell is deteriorated.
Disclosure of Invention
The invention provides a positive electrode material, a positive electrode plate and a lithium ion battery, aiming at the problems of insufficient compaction density and safety performance of the existing high-nickel ternary positive electrode material of the lithium ion battery.
The technical scheme adopted by the invention for solving the technical problems is as follows:
on one hand, the invention provides a positive electrode material which comprises a positive electrode active material, wherein the positive electrode active material comprises a secondary spherical nickel-cobalt-manganese ternary material and a single crystal type nickel-cobalt-manganese ternary material which are mixed with each other, and the molar ratio of the secondary spherical nickel-cobalt-manganese ternary material to the single crystal type nickel-cobalt-manganese ternary material is 1: 1-9: 1.
According to the anode material provided by the invention, the secondary spherical nickel-cobalt-manganese ternary material and the single crystal type nickel-cobalt-manganese ternary material are mixed for use, the inventor finds that the secondary spherical nickel-cobalt-manganese ternary material and the single crystal type nickel-cobalt-manganese ternary material with a single crystal morphology have a synergistic effect on the basis of a large number of experiments, and the anode active material obtained by blending not only ensures the advantage of high gram capacity of the nickel-cobalt-manganese ternary material, but also has good structural stability, overcomes the defects that the nickel-cobalt-manganese ternary material is easy to break and has low thermal decomposition temperature, and has higher thermal stability and higher compaction density.
Optionally, the positive active material is composed of a secondary spherical nickel-cobalt-manganese ternary material and a single crystal nickel-cobalt-manganese ternary material which are mixed with each other.
Optionally, the particle size range D50 of the quadratic spherical nickel-cobalt-manganese ternary material is 9 μm to 12 μm, and the particle size range D50 of the single crystal type nickel-cobalt-manganese ternary material is 3.5 μm to 6.5 μm.
Optionally, the molecular formula of the secondary spherical nickel-cobalt-manganese ternary material is LiNix＇Coy＇Mn1-x＇-y＇O2Wherein x 'is more than or equal to 0.6 and less than 1, and y' is more than 0 and less than or equal to 0.2.
Optionally, the molecular formula of the single-crystal nickel-cobalt-manganese ternary material is LiNix＂Coy＂Mn1-x＂-y＂O2Wherein x is more than or equal to 0.6 and less than 1, and y is more than 0 and less than or equal to 0.2.
Optionally, the positive electrode material further includes a positive electrode conductive agent, and the positive electrode conductive agent includes one or more of carbon nanotubes, conductive carbon black, acetylene black, graphene, and graphite.
Optionally, the positive electrode material further includes a positive electrode binder, and the positive electrode binder includes one or more of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, polyacrylic acid, and polyimide.
In another aspect, the present invention provides a positive electrode plate, including a positive electrode current collector and the positive electrode material as described above, wherein the positive electrode material is attached to the positive electrode current collector.
On the other hand, the invention provides a lithium ion battery, which comprises electrolyte, a negative pole piece and the positive pole piece.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention discloses a positive electrode material which comprises a positive electrode active material, wherein the positive electrode active material comprises a secondary spherical nickel-cobalt-manganese ternary material and a single crystal type nickel-cobalt-manganese ternary material which are mixed with each other, and the molar ratio of the secondary spherical nickel-cobalt-manganese ternary material to the single crystal type nickel-cobalt-manganese ternary material is 1: 1-9: 1.
In the cathode material, a secondary spherical nickel-cobalt-manganese ternary material and a single crystal type nickel-cobalt-manganese ternary material are mixed for use, and the inventor finds that the secondary spherical nickel-cobalt-manganese ternary material and the single crystal type nickel-cobalt-manganese ternary material with a single crystal morphology have a synergistic effect based on a large number of experiments, and the cathode active material obtained by blending not only ensures the advantage of high gram capacity of the nickel-cobalt-manganese ternary material, but also has good structural stability, overcomes the defects of easiness in crushing and low thermal decomposition temperature of the nickel-cobalt-manganese ternary material, and has higher thermal stability and higher compaction density.
In some embodiments, the positive active material is composed of a secondary spherical nickel-cobalt-manganese ternary material and a single crystalline nickel-cobalt-manganese ternary material mixed with each other.
In some embodiments, the particle size range D50 of the quadratic spherical nickel-cobalt-manganese ternary material is 9 μm to 12 μm, and the particle size range D50 of the single crystal nickel-cobalt-manganese ternary material is 3.5 μm to 6.5 μm.
By adjusting the particle size distribution of the secondary spherical nickel-cobalt-manganese ternary material and the single crystal nickel-cobalt-manganese ternary material, the single crystal nickel-cobalt-manganese ternary material with small particle size can be filled in gaps among secondary spherical nickel-cobalt-manganese ternary material particles with large particle size, so that the compaction density of the positive electrode active material is further improved, and good electrical contact between the secondary spherical nickel-cobalt-manganese ternary material and the single crystal nickel-cobalt-manganese ternary material is ensured.
In some embodiments, the molecular formula of the secondary spherical nickel-cobalt-manganese ternary material is LiNix＇Coy＇Mn1-x＇-y＇O2Wherein x 'is more than or equal to 0.6 and less than 1, and y' is more than 0 and less than or equal to 0.2.
In some embodiments, the single crystal type nickel-cobalt-manganese ternary material has a molecular formula of LiNix＂Coy＂Mn1-x＂-y＂O2Wherein x is more than or equal to 0.6 and less than 1, and y is more than 0 and less than or equal to 0.2.
In some embodiments, the positive electrode material further comprises a positive electrode conductive agent, and the positive electrode conductive agent comprises one or more of carbon nanotubes, conductive carbon black, acetylene black, graphene and graphite.
In a more preferred embodiment, the positive electrode conductive agent is selected from the group consisting of conductive carbon black super-P and multi-walled CNTs.
The positive electrode conductive agent is used to improve the conductivity between positive electrode active materials.
In some embodiments, the positive electrode material further comprises a positive electrode binder, and the positive electrode binder comprises one or more of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, polyacrylic acid and polyimide.
In a more preferred embodiment, the positive electrode binder is selected from polyvinylidene fluoride (PVDF).
The positive electrode binder is used for binding a positive electrode active material, and the stability of the positive electrode material is ensured.
Another embodiment of the present invention provides a positive electrode plate, including a positive electrode current collector and the positive electrode material as described above, wherein the positive electrode material is attached to the positive electrode current collector.
The positive electrode material is obtained by coating and drying positive electrode slurry, wherein the positive electrode slurry comprises components of the positive electrode material and a solvent for dispersing the components of the positive electrode material, the solvent can be an organic solvent, and specifically, the solvent can be N-methylpyrrolidone.
The positive current collector can adopt various metal materials with good conductivity.
In a more preferred embodiment, the positive electrode current collector is an aluminum foil.
Another embodiment of the present invention provides a lithium ion battery, which includes an electrolyte, a negative electrode plate, and the positive electrode plate described above.
In some embodiments, the lithium ion battery further comprises a separator between the negative pole piece and the positive pole piece.
The separator may be an existing polyolefin separator. The polyolefin diaphragm is a general diaphragm of a lithium ion battery and comprises a polypropylene (PP) diaphragm, a Polyethylene (PE) diaphragm, a PE/PP/PE three-layer diaphragm and the like.
In some embodiments, the negative electrode sheet comprises a negative electrode current collector and a negative electrode material layer, wherein the negative electrode material layer covers the negative electrode current collector.
The negative current collector can be made of various metal materials with good conductivity.
In a more preferred embodiment, the negative electrode current collector is a copper foil.
The negative electrode material layer includes a negative electrode active material, a negative electrode conductive agent, and a negative electrode binder.
The negative active material may be made of one or more of a carbon material, a metal alloy, a lithium-containing oxide, and a silicon-containing material.
The negative electrode conductive agent comprises one or more of carbon nano tubes, conductive carbon black, acetylene black, graphene and graphite.
The negative electrode binder comprises one or more of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, polyacrylic acid and polyimide.
The present invention will be further illustrated by the following examples.
Example 1
The embodiment is used for explaining the positive electrode material, the positive electrode plate, the lithium ion battery and the preparation method thereof, and the preparation method comprises the following operation steps:
(1) preparation of positive pole piece
The positive electrode active material was secondary spherical LiNi of 10.5 μm in D50 ═ 10.5 μm0.8Co0.1Mn0.1O2And 5.0 μm or D500.83Co0.12Mn0.05O2Uniformly mixing the materials according to the ratio of 7:3, and measuring the compacted density of the mixed powder to be 3.48g/cm3. Mixing the mixed powder with conductive carbon black super-P, multi-wall CNT and PVDF binder according to a mass fraction of 96.5: 1.0: 0.8: 1.7, adding a proper amount of N-methyl pyrrolidone (NMP), and dispersing in a high-speed dispersion machine until the viscosity is 3000-6000 mPa.S to obtain the anode slurry. And uniformly coating the positive electrode slurry on an aluminum foil current collector with the thickness of 14 mu m, and drying, rolling and slitting to obtain the positive electrode piece.
(2) Preparation of negative pole piece
Uniformly mixing the artificial graphite serving as the negative active material, a conductive agent super-P, Styrene Butadiene Rubber (SBR) serving as an adhesive and sodium carboxymethyl cellulose (CMC) serving as a carboxymethyl cellulose according to the mass ratio of 95.2:1.5:2.0:1.3, adding deionized water, and dispersing the mixture in a high-speed dispersion machine until the viscosity is 2500-0 mPa.S to obtain negative slurry. And uniformly coating the negative electrode slurry on a copper foil current collector with the thickness of 8 mu m, and drying, rolling and slitting to obtain a negative electrode plate.
(3) Preparation of lithium ion battery
Respectively placing the positive pole piece and the negative pole piece on a winding machine, isolating the positive pole piece and the negative pole piece by adopting an isolating film, preparing a naked electric core in a winding mode, manufacturing a packaging bag by using an aluminum plastic film composite material, placing the naked electric core in the packaging bag for packaging to obtain a dry electric core, and obtaining the lithium ion battery after the dry electric core is subjected to the working procedures of baking, liquid injection, sealing, standing, formation, degassing packaging, capacity grading and the like.
Example 2
The embodiment is used for explaining the positive electrode material, the positive electrode plate, the lithium ion battery and the preparation method thereof, which are disclosed by the invention, and the preparation method comprises most of the operation steps in the embodiment 1, and the difference is that:
in the preparation of the positive pole piece:
the positive electrode active material was a secondary spherical LiNi of 11.3 μm in D50 ═ 11.3 μm0.83Co0.12Mn0.05O2And 4.8 μm or D50 of LiNi0.83Co0.12Mn0.05O2Uniformly mixing the materials according to the ratio of 8:2, and measuring the compacted density of the mixed powder to be 3.51g/cm3。
Example 3
The embodiment is used for explaining the positive electrode material, the positive electrode plate, the lithium ion battery and the preparation method thereof, which are disclosed by the invention, and the preparation method comprises most of the operation steps in the embodiment 1, and the difference is that:
in the preparation of the positive pole piece:
the positive electrode active material was secondary spherical LiNi of 9.8 μm in D50 ═ 9.8 μm0.6Co0.2Mn0.2O2And LiNi of 6.0 μm in D500.6Co0.2Mn0.2O2Uniformly mixing the materials according to the ratio of 9:1, and measuring the compacted density of the mixed powder to be 3.45g/cm3。
Comparative example 1
The comparative example is used for comparing and explaining the positive electrode material, the positive electrode plate, the lithium ion battery and the preparation method thereof disclosed by the invention, and comprises most of the operation steps in the example 1, and the differences are that:
in the preparation of the positive pole piece:
the positive electrode active material was secondary spherical LiNi of 10.5 μm in D50 ═ 10.5 μm0.8Co0.1Mn0.1O2And the compacted density of the powder is measured to be 3.31g/cm3。
Comparative example 2
The comparative example is used for comparing and explaining the positive electrode material, the positive electrode plate, the lithium ion battery and the preparation method thereof disclosed by the invention, and comprises most of the operation steps in the example 1, and the differences are that:
in the preparation of the positive pole piece:
the positive electrode active material was secondary spherical LiNi of 9.8 μm in D50 ═ 9.8 μm0.6Co0.2Mn0.2O2The compacted density of the mixed powder was measured to be 3.29g/cm3。
Performance testing
The positive electrode plates prepared in the above examples 1 to 3 and comparative examples 1 and 2 were subjected to the following performance tests:
positive electrode sheet thermal stability test (DSC)
The first step is as follows: assembling the positive pole piece to be tested into a button cell, charging and discharging for one cycle (3.0-4.3V and 0.05C cutoff current) at 0.1C, and then charging to 4.3V (0.05C cutoff current) at 0.1C;
the second step is that: the button cell is disassembled in a glove box, and the pole piece is soaked in DMC; after drying, scraping the anode material from the pole piece, sampling 3-5mg, transferring to a stainless steel pressure crucible, dripping 3 mu L of electrolyte, and carrying out DSC test. 25-400 ℃ and a scanning speed of 10 ℃/min.
The test results obtained are filled in Table 1.
TABLE 1
As can be seen from the test results of the examples 1-3 and the comparative examples 1 and 2 in the table 1, the positive electrode material provided by the invention has higher compaction density, and particularly, the positive electrode material has better thermal stability and is beneficial to improving the safety performance of the lithium ion battery.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The positive electrode material is characterized by comprising a positive electrode active material, wherein the positive electrode active material comprises a secondary spherical nickel-cobalt-manganese ternary material and a single crystal type nickel-cobalt-manganese ternary material which are mixed with each other, and the molar ratio of the secondary spherical nickel-cobalt-manganese ternary material to the single crystal type nickel-cobalt-manganese ternary material is 1: 1-9: 1.
2. The positive electrode material according to claim 1, wherein the positive electrode active material is composed of a quadratic spherical nickel-cobalt-manganese ternary material and a single crystal type nickel-cobalt-manganese ternary material mixed with each other.
3. The positive electrode material according to claim 1 or 2, wherein the secondary spherical nickel-cobalt-manganese ternary material has a particle size range D50 ═ 9 μm to 12 μm, and the single crystal nickel-cobalt-manganese ternary material has a particle size range D50 ═ 3.5 μm to 6.5 μm.
4. The cathode material according to claim 1, wherein the molecular formula of the secondary spherical nickel-cobalt-manganese ternary material is LiNix＇Coy＇Mn1-x＇-y＇O2Wherein x 'is more than or equal to 0.6 and less than 1, and y' is more than 0 and less than or equal to 0.2.
5. The positive electrode material as claimed in claim 1, wherein the single crystal type nickel-cobalt-manganese ternary materialMolecular formula is LiNix＂Coy＂Mn1-x＂-y＂O2Wherein x is more than or equal to 0.6 and less than 1, and y is more than 0 and less than or equal to 0.2.
6. The lithium ion battery cathode material according to claim 1, further comprising a cathode conductive agent, wherein the cathode conductive agent comprises one or more of carbon nanotubes, conductive carbon black, acetylene black, graphene and graphite.
7. The positive electrode material of the lithium ion battery of claim 1, further comprising a positive electrode binder, wherein the positive electrode binder comprises one or more of polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, polyacrylic acid, and polyimide.
8. A positive electrode plate, comprising a positive electrode current collector and the positive electrode material according to any one of claims 1 to 7, wherein the positive electrode material is attached to the positive electrode current collector.
9. A lithium ion battery comprising an electrolyte, a negative electrode tab, and the positive electrode tab of claim 8.
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| CN112786834A (en) * | 2021-01-26 | 2021-05-11 | 蜂巢能源科技有限公司 | Positive pole piece and lithium ion battery comprising same |
| CN113036098A (en) * | 2021-02-09 | 2021-06-25 | 横店集团东磁股份有限公司 | Preparation method and application of composite high-nickel ternary blended ferrophosphorus positive electrode material |
| CN113972369A (en) * | 2021-10-29 | 2022-01-25 | 宁波容百新能源科技股份有限公司 | High-compaction-density ternary cathode material |
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