Lithium ion battery cathode material and preparation method thereof and lithium ion battery

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing battery capacity, in-depth research, high nickel cathode material rate and poor cycle performance, etc.

Pending Publication Date: 2019-04-30
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, researchers have found that high-nickel cathode materials are gradually replacing LiCoO2 cathode materials due to their advantages of high capacity and low price. However, high-nickel cathode materials have poor rate and cycle performance under high voltage. Residual alkali content on the surface of positive electrode material
In addition, the positive electrode material in the battery is in conta

Method used

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  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0074] Preparation steps of lithium-ion battery cathode material:

[0075] (1): Polyvinylpyrrolidone (PVP) with a mass ratio of 0.1:2:50: (NH 4 ) 2 HPO 4 : mixed with absolute ethanol and continuously stirred for 24 hours to obtain a uniformly mixed solution;

[0076] (2): Polyvinylpyrrolidone (PVP) with a mass ratio of 0.1:2:50:100: (NH 4 ) 2 HPO 4 : Anhydrous ethanol: LiNi 0.8 co 0.1 mn 0.1 o 2 , Weigh the positive electrode active material and add it to the mixed solution obtained in step (1), continue to stir for 24 hours, mix the positive electrode active material and the above solution evenly, stir at 45°C, and slowly evaporate the solution, after the solution evaporates, the obtained mixture Calcined at 450°C for 5h, cooled, pulverized and sieved, the resulting sample was marked as LP-NCM;

[0077] (3): Pyrrole monomer in a molar ratio of 1:3:9: sodium p-toluenesulfonate: FeCl 3 ·6H 2 O Weigh the above three raw materials, dissolve the liquid pyrrole monomer...

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Abstract

The purpose of the invention is to present a lithium ion battery cathode material and a preparation method thereof and a lithium ion battery. The cathode material includes a cathode active material, lithium phosphate arranged on at least part of the outer surface of the cathode active material, and a coating layer coating the exposed outer surfaces of the cathode active material and the lithium phosphate and including a conductive polymer. Thus, the residual alkali content on the surface of the cathode active material is low, and the rate performance stability and cyclic capacity retention rate of the cathode material can be improved. The lithium phosphate and the conductive polymer enable the cathode material to have ion-electron conductivity (double conduction), and further improve the rate performance stability and cyclic capacity retention rate of the cathode material. The coating layer can reduce or prevent the side reaction between the cathode active material and the electrolyteand improve the service life of the cathode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular, to a lithium ion battery cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, hybrid vehicles and energy storage systems due to their high capacity and high energy density. As one of the core components of lithium-ion batteries, cathode materials have a significant impact on the performance of lithium-ion batteries. [0003] At present, researchers have found that high-nickel cathode materials are gradually replacing LiCoO2 cathode materials due to their advantages of high capacity and low price. However, high-nickel cathode materials have poor rate and cycle performance under high voltage. The residual alkali content on the surface of the positive electrode material. In addition, the positive electrode material in the battery is in contact with the electrol...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/624H01M10/0525Y02E60/10
Inventor 白艳郑镇兴潘海龙李子郯车金柱崔军燕王涛陈修好陈婷婷马忠龙杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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