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Positive electrode material, preparation method thereof and lithium ion battery

A positive electrode material and high-nickel technology, applied in the field of positive electrode materials and their preparation, can solve the problems of high cost, unstable structure of positive electrode materials, high Co content, etc.

Active Publication Date: 2021-05-04
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a positive electrode material and a preparation method thereof and a lithium-ion electrode material to overcome the problems of high Co content and high cost in the positive electrode material in the prior art, as well as the complex preparation process and the unstable structure of the positive electrode material. Battery, the positive electrode material has a stable structure, has the advantages of high energy density, good rate performance, high capacity retention rate, and a simple and low-cost preparation method

Method used

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  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0044] According to the second aspect of the present invention, there is provided a method for preparing the aforementioned high-nickel and low-cobalt single crystal positive electrode material, wherein the preparation method includes:

[0045] (1) Under the protection of nitrogen, the mixed salt solution containing nickel salt and manganese salt, optional A salt solution, alkali solution and ammonia water are contacted and reacted in parallel to obtain a solid-liquid mixed slurry; After the solid-liquid mixed slurry is washed, press-filtered and dried, the precursor is obtained;

[0046] (2) contacting the precursor, the lithium source and the optional dopant D for the first mixing and then the first calcination treatment to obtain the positive electrode material intermediate;

[0047] (3) Contacting the positive electrode material intermediate, the nano-cobalt-containing compound, and the optional coating agent E for a second mixing, and then performing a second calcination ...

Embodiment approach

[0075] According to a particularly preferred embodiment of the present invention, a method for preparing a high-nickel and low-cobalt single crystal positive electrode material comprises:

[0076](1) Under the protection of nitrogen, the mixed salt solution containing nickel salt and manganese salt, optional A salt solution, alkali solution and ammonia water are contacted and reacted in parallel to obtain a solid-liquid mixed slurry; The solid-liquid mixed slurry is washed, filtered and dried to obtain a precursor; wherein, the concentration of the nickel salt is 1.8-2.2mol / L, and the concentration of the manganese salt is 1.8-2.2mol / L, The concentration of the A salt solution is 0.2-0.3mol / L, and the concentration of the alkali solution is 7.5-8mol / L; the doped A salt can be A-containing sulfate and / or nitrate; the mixed salt The molar ratio of the amount of the solution to the A salt solution is 1: (0.01-0.015); the pH value of the solid-liquid mixed slurry is 12.3-12.4; the...

Embodiment 1

[0091] This example is to illustrate the cathode material prepared by the method of the present invention.

[0092] (1) Using nickel sulfate and manganese sulfate as raw materials, according to the molar ratio Ni:Mn=90:10, a uniform nickel and manganese salt mixed solution of 2mol / L is prepared, and Ce of 0.2mol / L is prepared. 2 (SO 4 ) 3 solution, deploy 8mol / L NaOH solution as a precipitating agent, and use 25% ammonia water directly as a complexing agent.

[0093] Under the protection of nitrogen, the above solution was passed into the reactor in a co-current manner, controlled [n(Ni)+n(Mn)]: n(Ce)=1:0.01, the stirring speed was 200rpm, and the reaction temperature was maintained at 55 °C, the pH value is 12.3, the co-current time is 23h, and the aging time is 20h. After pressing, washing, and drying at 120°C for 5 hours, D 50 It is a 4.0μm nickel-manganese hydroxide precursor containing dopant Ce. The precursor is a spherical or quasi-spherical single particle with a l...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material comprises a high-nickel cobalt-free multi-element positive electrode material intermediate and a cobalt-containing compound coating the outer surface of the high-nickel cobalt-free multi-element positive electrode material intermediate, and the total mole number of nickel and manganese in the high-nickel cobalt-free multi-element positive electrode material intermediate is taken as a reference, the content of the cobalt-containing compound in terms of cobalt element is 0.5-5 mol%. The positive electrode material is stable in structure, high in energy density, good in rate capability, high in capacity retention ratio, simple in preparation method and low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the increasingly serious global energy and environmental problems, human beings urgently need new and clean energy to replace traditional fossil energy. The power lithium-ion battery is a high energy density battery, which has the advantages of zero pollution, zero emission and small size, and is the trend of the development and application of power batteries at home and abroad. [0003] As the main component of lithium-ion batteries, the cathode material determines the capacity and cost of the battery. High-nickel multi-component materials have attracted widespread attention because of their high energy density, long cycle life, and high cost performance. [0004] In CN101378126A, by Ni 0.5 mn 0.5 (OH) 2 The outer layer of the matrix is ​​c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525C30B1/10C30B29/22B82Y30/00B82Y40/00
CPCH01M4/505H01M4/525H01M4/485H01M4/5825H01M4/366H01M10/0525C30B29/22C30B1/10B82Y30/00B82Y40/00Y02E60/10
Inventor 赵甜梦宋顺林刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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