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Positive electrode active material, positive electrode, preparation method and lithium ion battery

A cathode active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as shortening sintering time, and achieve the effects of shortening sintering time, improving charge and discharge capacity, and convenient operation

Active Publication Date: 2022-05-27
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art that the surface coating layer of the positive electrode active material is in the form of dots, lithium ion diffusion and surface impedance are limited, the present invention proposes a positive electrode active material, a positive electrode and a preparation method, and a lithium ion battery. The positive electrode active material The surface has a very uniform film coating, and the ultra-thin tungsten compound coating improves the lithium ion diffusion during the charge and discharge process, effectively improving the charge and discharge capacity of the material, and effectively improving the surface impedance and cycle stability. The preparation method obtains the positive electrode active material through wet mixing or spraying, the process is simple, the operation is convenient, and the sintering time is shortened

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  • Positive electrode active material, positive electrode, preparation method and lithium ion battery
  • Positive electrode active material, positive electrode, preparation method and lithium ion battery
  • Positive electrode active material, positive electrode, preparation method and lithium ion battery

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preparation example Construction

[0077] In another specific embodiment, the present invention provides a method for preparing a cathode active material, the preparation method comprising the following steps:

[0078] Nickel cobalt manganese ternary material powder and tungsten-containing powder, ethanol after wet mixing or spraying, 200 to 600 °C, 8 to 20h calcination to obtain the cathode active material;

[0079] Wherein the wet method of mixing comprises nickel cobalt manganese ternary material powder and tungsten-containing powder dissolved in ethanol, stirred until ethanol volatilizes, the spraying comprises tungsten-containing powder mixed dissolved in ethanol after spraying to nickel cobalt manganese ternary material powder;

[0080] The molecular formula of the nickel-cobalt-manganese ternary material powder is LiNi x Co y Mn 1-x-y O 2 , wherein 0.5≤ x≤0.9,0≤y≤0.13, the tungsten-containing powder comprises H 4 W、H 2 W 2 O 7 、WO 3 、WO 2 、BW、B 2 W、W 2 N 3 、WF 6 、WF 4 or WOF 4Any one or at least two or more ...

Embodiment 1 to 9

[0086] Each embodiment provides a lithium-ion battery comprising a positive electrode active material, a positive electrode, each embodiment is prepared by using the preparation method of the cathode active material, the positive electrode and the lithium-ion battery described above in the embodiment of the present application, but the raw material type, proportion, mixing method and process parameters between each embodiment are different.

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Abstract

The invention provides a positive electrode active material, a positive electrode, a preparation method and a lithium ion battery, the positive electrode active material comprises nickel-cobalt-manganese ternary material powder and a tungsten-containing film layer coating the surface of the nickel-cobalt-manganese ternary material powder, and the mass fraction of tungsten is 1000-4000 ppm; according to the positive electrode containing the positive electrode active material, the surface provides good ionic conductivity and electronic conductivity, the dynamic performance of the battery is improved, and the direct-current impedance of the battery is optimized; and meanwhile, the positive electrode can optimize lithium ion diffusion to obtain higher capacity.

Description

Technical field [0001] The present invention belongs to the field of lithium-ion batteries, in particular to the cathode active material, the cathode and the preparation method and the lithium-ion battery. Background [0002] In order to solve the problem of material cost and limited cobalt ore resources, LiNi was developed as a low-cobalt ternary material x Co y Mn 1-x-y O 2 (y≤0.13), however, the decrease in the content of Co in low-cobalt ternary materials will reduce the overall conductivity of the material and affect the capacity of the battery; according to studies, coating a small amount of tungsten compound on the positive surface can effectively improve the ion and electronic conductivity of the material surface, thereby reducing the internal resistance of the battery and improving the low temperature performance. The existing dry coating obtained material tungsten coating is dotted, and the improvement of lithium ion diffusion and surface impedance is limited. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525Y02E60/10
Inventor 杨元婴孙化雨
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD