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Positive electrode material with multi-cavity structure, preparation method of positive electrode material and lithium ion battery

A positive electrode material and multi-chamber technology, applied in the direction of positive electrodes, structural parts, battery electrodes, etc., can solve the problems of reduced impedance of positive electrode materials, low cycle life of positive electrode materials, and poor strength, so as to improve cycle performance and suppress microcracks , enhance the effect of strength

Pending Publication Date: 2022-06-28
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the poor strength of positive electrode materials in the prior art, which leads to the defect of low cycle life of positive electrode materials, and provides a positive electrode material with a multi-chamber structure and its preparation method and lithium ion battery. The particle strength of the positive electrode material is significantly improved, so that the positive electrode material has the advantage of long life; in addition, the impedance of the positive electrode material is reduced, thereby improving the power performance of the positive electrode material

Method used

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  • Positive electrode material with multi-cavity structure, preparation method of positive electrode material and lithium ion battery
  • Positive electrode material with multi-cavity structure, preparation method of positive electrode material and lithium ion battery
  • Positive electrode material with multi-cavity structure, preparation method of positive electrode material and lithium ion battery

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preparation example Construction

[0047] A second aspect of the present invention provides a method for preparing the aforementioned positive electrode material, wherein the preparation method includes:

[0048] (1) Under the protection of an inert gas, an aqueous solution containing Ni, Co, and Mn soluble salts, a complexing agent and a precipitating agent are mixed to carry out a co-precipitation reaction to obtain Ni 1-x-y Co x Mn y (OH) 2 hydroxide precursor; the Ni 1-x-y Co x Mn y (OH) 2 The core of the hydroxide precursor is ≤2.0μm;

[0049] (2) The Ni 1-x-y Co x Mn y (OH) 2 The hydroxide precursor, the lithium source and the optional compound containing the M element are mixed and then sintered, and the sintered material is crushed and sieved to obtain the positive electrode material Li 1+a Ni 1-x-y Co x Mn y O 2 or Li 1+a Ni 1-x-y-z Co x Mn y M z O 2 .

[0050] The inventor of the present invention found that: in the process of the preparation method of the precursor, by adjusting...

Embodiment approach

[0066] According to the present invention, the lithium source is selected from one or more of lithium carbonate, lithium hydroxide and lithium nitrate. According to a particularly preferred embodiment of the present invention, the preparation method of the positive electrode material includes:

[0067] (1) Prepare an aqueous solution of Ni, Co, and Mn soluble salts with a certain concentration, and then add it, precipitating agent and complexing agent into the stirring reaction kettle respectively, maintaining a certain reaction temperature, and under the protection of inert gas, Ni is obtained by co-precipitation 1-x-y Co x Mn y (OH) 2 hydroxide precursor;

[0068] (2) uniformly mix the above-obtained hydroxide precursor with a lithium source and a compound containing M element, place it in an atmosphere furnace for sintering, and crush and sieve the sintered material to obtain a positive electrode material Li 1+a Ni 1-x-y-z Co x Mn y M z O 2 .

[0069] A third asp...

Embodiment 1

[0085] This example is to illustrate the positive electrode material prepared by the method of the present invention.

[0086] (1) the molar ratio of preparing nickel sulfate, cobalt sulfate and manganese sulfate is 0.33:0.33:0.34 1.5mol / L mixed solution, this mixed solution, complexing agent ammonia solution, precipitating agent sodium hydroxide solution are passed into reaction In the kettle, nitrogen was introduced as a protective gas, the ammonia concentration was controlled at 10g / L, the pH was controlled at 12.0, and the rotational speed was controlled at 70rpm. After maintaining this condition for 3h, the core growth was completed. The core was 0.9μm, and the internal crystal structure of the core was Small size and dense structure; then the ammonia content was increased to 16g / L, the pH was decreased to 11.5, and the rotational speed was decreased to 55rpm, and the conditions were maintained until particle D 50 After growing to 4.0 μm, the reaction was stopped; the rea...

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Abstract

The invention relates to the technical field of lithium ion battery positive electrode materials, and discloses a positive electrode material with a multi-cavity structure, a preparation method of the positive electrode material and a lithium ion battery. The positive electrode material is formed by gathering a plurality of primary particles, part of the primary particles grow in an oriented mode to form supporting structures, and the supporting structures are overlapped with one another to form a plurality of cavities in the positive electrode material. The particle strength of the positive electrode material is remarkably improved, so that the positive electrode material has the advantage of long service life; in addition, the impedance of the positive electrode material is reduced, so that the power performance of the positive electrode material is improved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a positive electrode material with a multi-chamber structure, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the development of the automobile industry, the number of automobiles in the world continues to increase, the consumption of petroleum, a non-renewable fossil fuel, is also increasing, and the large amount of exhaust emissions from automobiles have also caused serious environmental pollution. New energy vehicles using lithium-ion batteries have attracted much attention in recent years because of their reduced dependence on fossil fuels and reduced environmental pollution. [0003] At present, pure electric vehicle EVs have problems such as short cruising range and long charging time, which cannot meet the needs of consumers for the time being. Fuel-electric vehicles such as HEV (Hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10H01M4/36H01M4/1391H01M10/052H01M4/131C01G53/50C01P2002/54C01P2004/51C01P2004/62C01P2006/40
Inventor 张永强孙立国张学全刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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