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Monocrystal ternary positive electrode material, preparation method and battery

A cathode material, single crystal technology, applied in the field of preparation of single crystal ternary cathode materials, can solve the problems of reduced material stability, increased material cost, and reduced compaction density of pole pieces

Pending Publication Date: 2021-09-07
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the method to improve the power performance of single crystal materials is mainly to reduce the primary particle size, but the reduction of particle size will inevitably lead to the reduction of material stability and the reduction of the compaction density of pole pieces and other negative effects.
For the residual alkali on the surface of ternary materials, the water washing method is usually used, but this will increase the production process and the loss of valuable metals, and increase the cost of materials

Method used

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  • Monocrystal ternary positive electrode material, preparation method and battery
  • Monocrystal ternary positive electrode material, preparation method and battery
  • Monocrystal ternary positive electrode material, preparation method and battery

Examples

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Effect test

Embodiment 1

[0053] This embodiment provides a method for preparing a single crystal ternary cathode material, and the preparation method specifically includes the following steps:

[0054] (1) nickel chloride, cobalt chloride and manganese chloride are mixed with the mixed salt solution that concentration is 1mol / L by stoichiometric ratio, meanwhile, prepare the sodium hydroxide solution of 2mol / L and the ammonia solution of 5wt%; Mixed salt solution, sodium hydroxide solution and ammonia solution are added to the mixer at the same time according to the volume ratio of 1:2:0.2, the pH of the mixed solution is controlled at 8, the reaction temperature is 50°C, the stirring speed is 600r / min, and the stirring time is 10h, the precipitate obtained by the reaction was successively filtered, washed and dried to obtain the precursor Ni 0.9 co 0.05 mn 0.05 (OH) 2 ;

[0055] (2) Ni 0.9 co 0.05 mn 0.05 (OH) 2 Precursor and lithium hydroxide are mixed and ball milled, wherein the lithium ra...

Embodiment 2

[0058] This embodiment provides a method for preparing a single crystal ternary cathode material, and the preparation method specifically includes the following steps:

[0059] (1) Nickel nitrate, cobalt nitrate and manganese nitrate are mixed into the mixed salt solution that concentration is 1.5mol / L by stoichiometric ratio, meanwhile, the sodium hydroxide solution of preparation 3mol / L and the ammonia solution of 8wt%; Mixed salt Solution, sodium hydroxide solution and ammonia solution were added to the stirrer at the same time according to the volume ratio of 1.5:3:1, the pH of the mixed solution was controlled at 9, the reaction temperature was 55°C, the stirring speed was 500r / min, and the stirring time was 12h. The precipitate obtained from the reaction was successively filtered, washed and dried to obtain the precursor Ni 0.7 co 0.15 mn 0.15 (OH) 2 ;

[0060] (2) Ni 0.7 co 0.15 mn 0.15 (OH) 2 The precursor and lithium carbonate were mixed and ball milled, where...

Embodiment 3

[0063] This embodiment provides a method for preparing a single crystal ternary cathode material, and the preparation method specifically includes the following steps:

[0064] (1) Nickel sulfate, cobalt sulfate and manganese sulfate are mixed into the mixed salt solution that concentration is 4mol / L by stoichiometric ratio, meanwhile, the sodium hydroxide solution of preparation 4mol / L and the ammoniacal solution of 10wt%; Mixed salt solution , sodium hydroxide solution and ammonia solution are simultaneously added to the stirrer according to the volume ratio of 2:4:1, the pH of the mixed solution is controlled at 13, the reaction temperature is 70°C, the stirring speed is 300r / min, and the stirring time is 15h. The resulting precipitate was filtered, washed and dried to obtain the precursor Ni 0.65 co 0.1 mn 0.35 (OH) 2 ;

[0065] (2) Ni 0.65 co 0.1 mn 0.35 (OH) 2 Precursor and lithium chloride are mixed and ball milled, wherein the lithium ratio Li / (Ni+Co+Mn)=1.03, ...

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Abstract

The invention provides a single-crystal ternary positive electrode material, a preparation method and a battery. The preparation method comprises the following steps of: mixing a ternary precursor and a lithium source, and performing primary sintering to obtain a primary sintered product; and mixing the primary sintered product, a conductive agent and a lithium source, and carrying out secondary sintering to obtain the single-crystal ternary positive electrode material. According to the invention, by regulating and controlling the addition amount of the conductive agent and the sintering temperature in the secondary sintering process, the conductivity of the single crystal ternary positive electrode material is improved, and the residual alkali on the surface of the material is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a single crystal ternary positive electrode material, a preparation method and a battery. Background technique [0002] Power battery is the core of electric vehicles, it is the only source of driving energy for pure electric vehicles, directly related to the power performance of electric vehicles, battery life, and directly related to the safety of electric vehicles. The cost of new energy vehicles, the battery power system occupies 30-50% of the cost of new energy vehicles. Since the birth of electric vehicles, power battery technology has had the practical process of electric vehicles. Improving power density, energy density, service life and reducing cost have always been the core of electric vehicle power battery technology research and development. [0003] The ternary material NCM or NCA is widely used in the field of electric vehicles due to its high specific ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/624H01M4/628H01M4/525H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 王超曾汉民林文佳何巍
Owner EVE ENERGY CO LTD
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