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Lithium ion battery and positive electrode material thereof

A lithium-ion battery and positive electrode material technology, applied in the field of new energy materials, can solve the problems of poor cycle performance and large specific surface area of ​​lithium-ion batteries, and achieve high practical application value, low cost, and slow capacity decay.

Inactive Publication Date: 2018-05-25
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem that the existing lithium-ion battery high-nickel positive electrode material has a large specific surface area after removing the residual lithium on the surface, resulting in poor cycle performance of the lithium-ion battery, and to provide a lithium-ion battery with good cycle stability. Lithium ion battery with high nickel material as positive electrode material

Method used

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  • Lithium ion battery and positive electrode material thereof
  • Lithium ion battery and positive electrode material thereof
  • Lithium ion battery and positive electrode material thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The chemical formula of lithium-ion battery cathode material is LiNi 0.6 co 0.2 mn 0.2 o 2 , its preparation method is:

[0034] The amount of residual lithium (LiOH, Li 2 CO 3 ), calculate the NH needed to completely precipitate the lithium residue 4 h 2 PO 4 theoretical dosage;

[0035] Combine high nickel material with NH 4 h 2 PO 4 Mix well, where NH 4 h 2 PO 4 The amount of addition and the amount of residual lithium on the surface (Li + ) in a mol ratio of 1:3 to obtain an intermediate product;

[0036] The intermediate product was calcined at a heating rate of 2°C / min, and calcined at a temperature of 500°C for 6 hours to obtain a lithium-ion battery positive electrode material coated with lithium phosphate on the surface, as shown in the SEM image figure 2 As shown, the EDS diagram of the phosphorus element distribution on the surface is as follows Figure 4 shown.

Embodiment 2

[0038] The chemical formula of lithium-ion battery cathode material is LiNi 0.6 co 0.2 mn 0.2 o 2 , the preparation method is similar to that of Example 1, only changing the calcination parameters, wherein the heating rate is 5°C / min, and sintering at 600°C for 4h to obtain a lithium ion battery positive electrode material coated with lithium phosphate on the surface.

Embodiment 3

[0040] The chemical formula of lithium-ion battery cathode material is LiNi 0.8 co 0.15 Al 0.05 o 2 , the preparation method is similar to that of Example 1, only changing the calcination parameters, wherein the heating rate is 5°C / min, and sintering at 700°C for 4h to obtain a lithium ion battery positive electrode material coated with lithium phosphate on the surface.

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Abstract

The invention discloses a lithium ion battery and a positive electrode material thereof. The general chemical formula of the positive electrode material of the lithium ion battery is LiNixM[1-x]O2, wherein x is greater than or equal to 0.5 but smaller than 1; the M is one or more of Co, Mn, Al, Mg, Ti and Zr; the specific surface area of the positive electrode material of the lithium ion battery is 0.2 to 0.6m<2> / g; the surface lithium residue quantity is 200 to 1000 ppm. Compared with the prior art, the positive electrode material of the lithium ion battery is prepared through solid phase reaction; the surface lithium residue quantity of the material can be obviously reduced; the specific surface area increase of the positive electrode material of the lithium ion battery in the reaction process can also be avoided. The circulation stability of the positive electrode material of the lithium ion battery is good; the preparation method is simple; the implementation is easy; the production cost is low; good application prospects are realized. The invention also discloses the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of new energy materials, more specifically, the invention relates to a lithium-ion battery with good cycle stability and its positive electrode material. Background technique [0002] Lithium-ion batteries have been widely studied and widely used in mobile phones, portable computers, In mobile electronic devices such as video cameras and cameras, traditional batteries are also gradually replaced in the fields of aviation, aerospace, navigation, artificial satellites, small medical instruments and military communication equipment. [0003] High-nickel materials have been widely used in lithium-ion battery cathode materials due to their high specific capacity. However, as the nickel content increases, the surface residual lithium (lithium hydroxide and lithium carbonate, etc.) of high-nickel materials is also more, and the surface residual lithium will directly affect the gas production of lithium-ion batteries during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525C01D15/04C01D15/06C01D15/10C01P2002/85C01P2004/03C01P2004/80C01P2006/12C01P2006/80H01M4/1315H01M4/485H01M2004/028C01G53/42C01G53/50C01P2002/50H01M4/131H01M4/136H01M4/366H01M4/5825Y02E60/10C01P2006/40
Inventor 刘辉袁毅妮汪龙柳娜
Owner CONTEMPORARY AMPEREX TECH CO
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