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Anode active material, positive plate of lithium ion battery and lithium ion battery

A positive electrode active material and lithium-ion battery technology, applied in the direction of active material electrodes, battery electrodes, secondary batteries, etc., can solve the problems of low material compaction density, poor cycle performance of lithium cobaltate, etc., to achieve comprehensive performance improvement, preparation Simple method, easy industrial production and control effect

Inactive Publication Date: 2009-02-18
SHENZHEN BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The positive electrode active material of the present invention makes full use of the high compacted density, high safety and Li a Ni x co y m 1-x-y o 2 The advantages of high capacity, high cycle, and safety performance overcome the poor cycle performance of single large particle size lithium cobaltate and the single Li a Ni x co y m 1-x-y o 2 Disadvantages of low compaction density of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh lithium cobaltate LiCoO produced by Hunan Ruixiang New Material Co., Ltd. according to the mass ratio of 9:1 2 and the nickel-based material Li produced by Zhejiang Yanguang Technology (Jiaxing) Co., Ltd. a Ni x co y m 1-x-y o 2 (0.97≤a≤1.07, 0.3≤x≤0.95, 0≤y≤0.5, metal M is one or more of manganese, aluminum, magnesium, titanium, vanadium), ball milled in a vibration mill for 2 hours and mixed evenly, Then, it was dried at 150° C. for 10 h to obtain the positive electrode active material of this example. Among them, lithium cobalt oxide LiCoO 2 The particle size D10=4.5um, D50=9um, D90=21um; nickel-based material Li a Ni x co y m 1-x-y o 2 Secondary particles with a particle size of D50 = 12 um are formed by agglomeration of primary particles with a particle size of about 1 um.

[0024] In this example, the positive electrode active material, the binder polyvinylidene fluoride PVDF, the solvent NMP, and the conductive carbon are stirred evenly to prepar...

Embodiment 2

[0026] The difference between this embodiment and embodiment 1 is: lithium cobaltate LiCoO 2 and nickel-based material Li a Ni x co y m 1-x-y o 2 The mass ratio is 8:2, lithium cobalt oxide LiCoO 2 The particle size D10=5um, D50=8um, D90=20um; nickel-based material Li a Ni x co y m 1-x-y o 2 Secondary particles with a particle size of D50 = 8 um are formed by agglomeration of primary particles with a particle size of about 0.5 um.

[0027] The manufacturing process of the positive electrode slurry, the positive electrode sheet, the negative electrode sheet, and the battery is the same as in Example 1. The highest compacted density of the cathode material is 4.1g / cm 3 , hot pressing is used in the rolling process to make the positive electrode sheet, so that the compacted density of the material is 0.2 lower than the highest compacted density, that is, 3.9g / cm 3 .

[0028] The method and condition of the performance test are also the same as in Example 1, and the t...

Embodiment 3

[0030] The difference between this embodiment and embodiment 1 is: lithium cobaltate LiCoO2 and nickel base material Li a Ni x co y m 1-x-y o 2 The mass ratio is 6:4, lithium cobalt oxide LiCoO 2 The particle size D10=5.5um, D50=10um, D90=19um; nickel-based material Li a Ni x co y m 1-x-y o 2 Secondary particles with a particle size of D50 = 14 um are formed by agglomeration of primary particles with a particle size of about 2 um.

[0031] The manufacturing process of the positive electrode slurry, the positive electrode sheet, the negative electrode sheet, and the battery is the same as in Example 1. The highest compacted density of the cathode material is 4.05g / cm 3 , when rolling, hot pressing is used to make the compacted density of the material 0.2 lower than the highest compacted density, that is, 3.85g / cm 3 .

[0032] The method and condition of the performance test are also the same as in Example 1, and the test results are shown in Table 1.

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Abstract

The invention provides a anode active material, especially a mixture of LiaNixCoyM1-x-yO2 and LiCoO2, the mixed mass ratio between the LiaNixCoyM1-x-yO2 and the LiCoO2 is 9 : 1-1 :1; in the LiaNixCoyM1-x-yO2, 0.97<=a<=1.07, 0.3<=x<=0.95, 0<=y<=0.5, M is one or more of manganese, aluminum, magnesium, titanium and vanadium. By combining the LiaNixCoyM1-x-yO2 and the LiCoO2, the anode active material according to the invention can improved synthesis performance of the anode active material, with high cost performance higher than lithium manganese oxide, lithium cobalt oxide with single component, or nickel radical material / unit triplet material of nickel, cobalt, manganese. The anode material according to the invention has simple manufacture method, being convenient for industrial manufacture and control.

Description

technical field [0001] The invention relates to a positive electrode active material of a lithium ion battery, in particular to a positive electrode active material of a lithium ion battery with good comprehensive performance and high cost performance. Background technique [0002] As the preferred energy source for electronic terminal products, lithium-ion batteries have the advantages of high specific energy, high voltage, environmental protection and safety, and long service life. With the continuous expansion of the functions of electronic terminal products, the requirements for the specific energy and safety of lithium-ion batteries are also getting higher and higher. Therefore, the development of cost-effective electrode materials is an important issue for lithium-ion battery researchers. [0003] Lithium cobaltate, nickel-based materials / ternary materials and lithium manganate are currently commonly used cathode active materials for lithium-ion batteries. The commer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/02H01M10/40
CPCY02E60/122Y02E60/10
Inventor 方送生
Owner SHENZHEN BAK BATTERY CO LTD
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