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A kind of preparation method of composite positive electrode of lithium ion battery

A lithium-ion battery and composite positive electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult to balance rate performance and cycle performance, high cycle performance, high cost, etc., to achieve high rate performance and cycle performance, Improved rate performance and improved cycle life

Active Publication Date: 2021-10-22
浙江格派钴业新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current cathode material L cobalt oxide for lithium-ion batteries still has defects such as high cost and low capacity.
The new composite cathode material LiCoMnO 2 Although it has the advantages of high capacity, low cost, and good safety, it is difficult to meet the requirements of rate performance and cycle performance. In view of the above defects, the present invention proposes to combine two ratios of lithium cobalt manganate to obtain a composite electrode, and for different The material, and the position of the electrode active material layer to determine the appropriate particle size range, the obtained positive electrode has good rate performance and high cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]1) The active substance A is sieved through the first sieve and the second sieve successively, the aperture of the first sieve is 3.3 μm, and the aperture of the second sieve is 2.5 μm, and the active substance on the first sieve is collected A is the first active substance A, the active substance A collected on the second screen is the second active substance A, and the active substance A under the second screen is collected as the third active substance A;

[0036] 2) The active substance B is sieved through the first sieve and the second sieve successively, the aperture of the first sieve is 2.9 μm, and the aperture of the second sieve is 2.1 μm, and the active substance on the first sieve is collected B is the first active substance B, the active substance B collected on the second screen is the second active substance B, and the active substance B under the second screen is collected as the third active substance B;

[0037] 3) Add NMP to the stirred tank, then add ...

Embodiment 2

[0049] 1) The active substance A is sieved through the first sieve and the second sieve successively, the aperture of the first sieve is 3.5 μm, and the aperture of the second sieve is 2.7 μm, and the active substance on the first sieve is collected A is the first active substance A, the active substance A collected on the second screen is the second active substance A, and the active substance A under the second screen is collected as the third active substance A;

[0050] 2) The active substance B is sieved through the first sieve and the second sieve successively, the aperture of the first sieve is 3.1 μm, the aperture of the second sieve is 2.3 μm, and the active substance on the first sieve is collected B is the first active substance B, the active substance B collected on the second screen is the second active substance B, and the active substance B under the second screen is collected as the third active substance B;

[0051] 3) Add NMP to the stirred tank, then add PVD...

Embodiment 3

[0063] 1) The active substance A is sieved through the first sieve and the second sieve successively, the aperture of the first sieve is 3.4 μm, and the aperture of the second sieve is 2.6 μm, and the active substance on the first sieve is collected A is the first active substance A, the active substance A collected on the second screen is the second active substance A, and the active substance A under the second screen is collected as the third active substance A;

[0064] 2) The active substance B is sieved through the first sieve and the second sieve successively, the aperture of the first sieve is 3.0 μm, the aperture of the second sieve is 2.2 μm, and the active substance on the first sieve is collected B is the first active substance B, the active substance B collected on the second screen is the second active substance B, and the active substance B under the second screen is collected as the third active substance B;

[0065] 3) Add NMP to the stirred tank, then add PVD...

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Abstract

The invention provides a method for preparing a composite positive electrode of a lithium ion battery. The composite positive electrode includes a first active material layer, a second active material layer, a third active material layer and a fourth active material layer, wherein each active material layer Both contain an active material composed of active material A and active material B; the active material A is LiCo 0.65 mn 0.32 Al 0.03 o 2 ; The active material B is LiCo 0.33 mn 0.65 Al 0.02 o 2 The preparation method includes mixing active material A and active material B of different particle sizes to prepare a slurry of each active material layer, and then coating and drying the slurry in order to obtain the composite positive electrode. The positive electrode obtained by the manufacturing method of the present invention has good rate performance and cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a composite positive electrode of a lithium ion battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, light weight, long cycle life, environmental friendliness, no memory effect, safety and reliability, and have become the main power source of portable electronic appliances. However, lithium cobalt oxide, the cathode material for lithium-ion batteries, still has defects such as high cost and low capacity. The new composite cathode material LiCoMnO 2 Although it has the advantages of high capacity, low cost, and good safety, it is difficult to meet the requirements of rate performance and cycle performance. In view of the above defects, the present invention proposes to combine two ratios of lithium cobalt manganate to obtain a composite electrode, and for different The appropriate material and the position of the electrode active material lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 曹栋强龚丽锋王红忠黄飞中杨扬金妍
Owner 浙江格派钴业新材料有限公司
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