Positive plate and lithium ion battery comprising positive plate

A technology for lithium-ion batteries and positive plates, which is applied in the direction of positive electrodes, secondary batteries, and battery electrodes. Achieve the effects of improving cycle performance, improving high temperature and high pressure resistance

Inactive Publication Date: 2020-11-10
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with low voltage, the fast charging cycle performance of lithium-ion batteries under high voltage system is greatly affected, the cycle performance is extremely unstable, the cycle life is difficult to be guaranteed, and the performance deterioration is more obvious after the temperature increases
All of these make the application of high-voltage fast-charge lithium-ion batteries severely restricted

Method used

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  • Positive plate and lithium ion battery comprising positive plate
  • Positive plate and lithium ion battery comprising positive plate
  • Positive plate and lithium ion battery comprising positive plate

Examples

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Effect test

preparation example Construction

[0072] The present invention also provides a method for preparing the above positive electrode sheet, the method comprising the following steps:

[0073] 1) respectively preparing the slurry forming the first positive electrode active material layer and the slurry forming the second positive electrode active material layer;

[0074] 2) Using a double-layer coating machine, coating the slurry forming the first positive electrode active material layer and the slurry forming the second positive electrode active material layer on the first surface of the positive electrode current collector to prepare the negative electrode sheet.

[0075] According to the present invention, described method also comprises the following steps:

[0076] 3) using a double-layer coating machine, coating the slurry forming the first positive electrode active material layer and the slurry forming the second positive electrode active material layer on the second surface of the positive electrode current...

preparation example 1

[0081] Will Li 2 CO 3 、Co 3 o 4 Mix according to the molar ratio of 3:2, and add Al 2 o 3 and MgO, sintered in air at 350°C for 4 hours to prepare the intermediate product; grind the intermediate product to obtain D 50 The intermediate product was 19.5 μm, and the intermediate product was put into the tube furnace again, and sintered at 800° C. for 8 hours to obtain Al and Mg co-doped lithium cobaltate. Wherein, the doping amount of Al accounts for 0.05% of the total mass of lithium cobalt oxide, and the doping amount of Mg accounts for 0.1% of the total mass of lithium cobalt oxide.

preparation example 2-14

[0083] The preparation process of Preparation Examples 2-14 is the same as that of Preparation Example 1, except that the doping amounts of Al and Mg are different, as detailed in Table 1 below.

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Abstract

The invention provides a positive plate and a lithium ion battery comprising the positive plate. The positive plate comprises a positive current collector, a first positive active material layer and asecond positive active material layer, wherein the first positive active material layer is arranged on the first surface of the positive current collector, and the second positive active material layer is arranged on the surface of the first positive active material layer; the first positive electrode active material layer comprises a first positive electrode active material, the second positiveelectrode active material layer comprises a second positive electrode active material, the first positive electrode active material is a positive electrode active material doped and / or coated with anMg element and an Al element, and the second positive electrode active material is a positive electrode active material doped and / or coated with an Al element. According to the positive plate, on theone hand, the high-temperature resistance and high-voltage resistance of positive active material particles on the surface of the positive plate can be ensured; on the other hand, the internal resistance of the positive plate is reduced, so the polarization in a quick charging process is reduced, and the quick charging cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode sheet for improving high-voltage fast charging cycle performance and a lithium ion battery including the positive electrode sheet. Background technique [0002] In recent years, the sales of consumer portable electronic products have shown explosive growth. Lithium-ion batteries are the core components of consumer portable electronic products. Long life is an important indicator of lithium-ion batteries, which is of great significance to energy saving, emission reduction and environmental protection. At the same time, in order to solve the problem of "battery life and charging anxiety" of the product, continuously improving the energy density of the battery and fast charging are one of the main development directions at present. [0003] At present, researchers are gradually increasing investment in lithium-ion battery research. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/485H01M4/62H01M10/0525H01M10/44H01M4/02
CPCH01M4/131H01M4/362H01M4/485H01M4/624H01M10/0525H01M10/44H01M2004/028Y02E60/10
Inventor 贺伟彭冲曾佳张保海石越李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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