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Composite cathode material, cathode sheet, preparation method of cathode sheet, and lithium ion battery

A composite positive electrode material and lithium-ion battery technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of poor safety performance of batteries, easy oxygen release, energy density and power density that cannot meet energy demand, etc. Achieve the effect of high initial exothermic temperature and high safety

Active Publication Date: 2019-07-02
江西星盈科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the development of electronic and electrical equipment, especially the rapid development of electric vehicles, the energy density and power density of existing lithium-ion batteries cannot meet the energy demand, so finding and preparing materials with high energy density is an urgent problem
[0003] The compaction density, platform voltage and gram capacity of ternary materials have great advantages, but the thermal stability of ternary materials is poor, and oxygen is easily released in the delithiated state, resulting in poor safety performance of this type of battery.
For example, the high-nickel ternary material NCM811 has a capacity of up to 200mAh / g, a voltage platform of 3.6V, and a compaction density of 3.4g / cm 3 , but the NCM811 in the delithiated state begins to release oxygen at around 235°C, which directly aggravates the thermal runaway degree of the battery, and has application safety problems, which limits the promotion of ternary materials as cathode materials

Method used

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  • Composite cathode material, cathode sheet, preparation method of cathode sheet, and lithium ion battery
  • Composite cathode material, cathode sheet, preparation method of cathode sheet, and lithium ion battery
  • Composite cathode material, cathode sheet, preparation method of cathode sheet, and lithium ion battery

Examples

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Embodiment 1

[0066] This embodiment provides a composite positive electrode material suitable for lithium-ion batteries, which is mainly composed of three types of materials: A, B, and C.

[0067] Among them, the A material is a nickel-cobalt-lithium composite oxide (referred to as the first nickel-cobalt-lithium composite oxide), and its molecular formula is Li 1+x1 Ni 1-y1-z1 co y1 N z1 o 2 , wherein N is at least one of Mn and Al, -0.05<x1<0.1, y1=2Z, 0.10≤y1+z1≤0.14. Material A is a spherical aggregate of secondary particles formed by agglomeration of primary particles. The particle size of the primary particles is 200-400nm, and the crystal structure of the primary particles is layered. The particle size distribution of material A is narrow, the minimum particle size Dmin_A of material A is greater than 5um, and the average particle size D50 is 10-12um;

[0068] B material is another nickel-cobalt-lithium composite oxide (recorded as the second nickel-cobalt-lithium composite ox...

Embodiment 1A

[0087] A0 material, molecular formula is Li 0.99 Ni0 0.88 co 0.08 mn 0.04 o 2 (ie molecular formula Li 1+x1 Ni 1-y1-z1 co y1 N z1 o 2 Among them, x1=0.01, y1=0.08, z1=0.04), purchased from Thornton New Energy Technology Co., Ltd., is a secondary particle spherical aggregate formed by primary particles of 200-400nm, and the minimum particle size of the A0 material is D min The value is 0.4um, and the average particle size D50 of the A0 material in this experimental example is 11.2um, which has a wide particle size distribution. figure 1It is the scanning electron microscope picture of the A0 material of this embodiment.

[0088] Material A0 passes through a powder classifier and is classified to obtain material A, and the minimum particle size of material A obtained is D min The value is 6.2um, so that the particle size distribution of material A obtained by classification is further narrowed compared with material A0. The average particle diameter D50 of material A o...

Embodiment 2A

[0097] Compared with Example 1A, the composite positive electrode material is composed of A, B and C, the mass ratio of A:B:C is 74.16%:24.09%:1.75%, and the rest are the same.

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Abstract

The invention relates to the field of lithium ion batteries and discloses a composite cathode material, a cathode sheet, a preparation method of the cathode sheet, and a lithium ion battery. The material includes first nickel-cobalt-lithium composite oxide which is a secondary particle spherical agglomerate, wherein the primary particles in the secondary particle spherical agglomerate have a particle diameter of 200 to 400 nm, and the first nickel-cobalt-lithium composite oxide has an average particle diameter of 10 to 12[mu]m; second nickel-cobalt-lithium composite oxide which is a single crystal-like material, wherein the primary particles in the second nickel-cobalt-lithium composite oxide have a particle diameter of 600 to 2000 nm, and the second nickel-cobalt-lithium composite oxide has an average particle diameter of 6.5 to 8.5[mu]m; and a LMFP compound which is a single crystal-like material, wherein the primary particles in the LMFP compound have a particle diameter of 50 to 200 nm, and the LMFP compound has an average particle diameter of 0.8 to 2[mu]m. Applying the technical solution is beneficial to improving the energy density and the safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and discloses a composite positive electrode material, a positive electrode sheet, a preparation method for the positive electrode sheet, and a lithium ion battery. Background technique [0002] Since the commercialization of lithium-ion batteries, because of their advantages such as high energy density, high battery voltage, long cycle life and no memory effect, they have not only rapidly become energy storage devices used in various fields of life, but also attracted experts and researchers. broad interests. With the development of electrical and electronic equipment, especially the rapid development of electric vehicles, the energy density and power density of existing lithium-ion batteries cannot meet the energy demand. Therefore, finding and preparing materials with high energy density is an urgent problem. [0003] Ternary materials have great advantages in compaction density, platform...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M4/04H01M10/0525
CPCH01M4/0404H01M4/043H01M4/131H01M4/1391H01M4/362H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 郭永兴卢林张永鹏崔献广
Owner 江西星盈科技有限公司
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