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Positive electrode material and preparation method and application thereof

A technology of positive electrode materials and positive electrode active materials, which is applied in the field of positive electrode materials and its preparation, can solve the problems of lithium ion transmission path blockage, excessive capacity decay, low thermal stability and safety, etc., and achieve improved capacity and cycle safety performance , Improve the rate performance and cycle performance, the effect of excellent rate performance and cycle performance

Active Publication Date: 2022-04-01
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, high-nickel materials are widely used, but high-nickel materials often have disadvantages such as poor cycle performance, low thermal stability and safety, because they are rich in nickel, prone to mixed cations, and transition metal ions are less likely to dissolve out during the use of materials. Seriously lead to the deterioration of the stability of the material structure and cause a series of problems in the battery, such as increased internal resistance, excessive capacity decay, etc.; the high residual alkali of high-nickel materials will cause the transmission path of lithium ions to be blocked, the capacity is low, and the subsequent The impact of the battery mixing process

Method used

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  • Positive electrode material and preparation method and application thereof

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preparation example Construction

[0059] According to another aspect of the present invention, the present invention also relates to the preparation method of the positive electrode material, comprising the following steps:

[0060] The mixture of the lithium source, the ternary precursor, the indium source and the antimony source is subjected to the first heat treatment to obtain the positive electrode active material; the positive electrode active material is washed with a washing liquid containing soluble cobalt salt, and the washed mixed system is subjected to Aging and drying to obtain a positive electrode substrate to which cobalt hydroxide is attached;

[0061] performing a second heat treatment on the mixture of the cobalt hydroxide-attached positive electrode substrate and the strontium source to obtain a strontium-coated positive electrode composite material; and performing a third heat treatment on the mixture of the strontium-coated positive electrode composite material and the boron source.

[006...

Embodiment 1

[0091] A method for preparing a positive electrode material, comprising the steps of:

[0092] (a) Add the lithium source, the ternary precursor, the indium source and the antimony source into a high-speed mixer in a certain molar ratio and mix them uniformly to obtain a mixed powder. The mixed powder is subjected to the second step in an oxygen atmosphere. 1. High temperature sintering, the flow rate of oxygen atmosphere is 1.2m 3 / h, the temperature of the first high-temperature sintering is 730°C, and the time is 10h; after the sintering is completed, the positive active material LiNi can be obtained after cooling 0.9 co 0.05 mn 0.02 In 0.01 Sb 0.02 o 2 ;

[0093] Among them, the lithium source is lithium hydroxide; the ternary precursor is NCM811; the indium source is indium hydroxide; the antimony source is antimony hydroxide; the molar ratio of lithium source, ternary precursor, indium source and antimony source is 1.1:1: 0.01:0.02;

[0094] (b) LiNi in step (a) ...

Embodiment 2

[0101] A method for preparing a positive electrode material, comprising the steps of:

[0102] (a) Add the lithium source, the high-nickel ternary precursor, the indium source and the antimony source together in a certain molar ratio into a high-speed mixer and mix them uniformly to obtain a mixed powder, which is then placed in an oxygen atmosphere Carry out the first high temperature sintering, the flow rate of oxygen atmosphere is 2m 3 / h, the temperature of the first high-temperature sintering is 900°C, and the time is 6h; after the sintering is completed, the positive electrode active material LiNi is obtained after cooling 0.9 co 0.05 mn 0.02 In 0.01 Sb 0.02 o 2 ;

[0103] Among them, the lithium source is lithium hydroxide; the ternary precursor is NCM811; the indium source is indium hydroxide; the antimony source is antimony hydroxide; the molar ratio of lithium source, ternary precursor, indium source and antimony source is 1.1:1: 0.01:0.02;

[0104] (b) LiNi ...

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Abstract

The invention relates to the technical field of batteries, in particular to a positive electrode material and a preparation method and application thereof. The positive electrode material comprises a positive electrode base material, and a first coating layer and a second coating layer which are sequentially coated on the surface of the positive electrode base material from inside to outside, the positive electrode base material comprises a positive electrode active material and cobalt oxide attached to a part of the surface of the positive electrode active material, the chemical general formula of the positive electrode active material comprises LiNi < 0.9 > Co < 0.05 > Mn < 0.05-x-y > In < x > SbyO < 2 >, xlt; 0, 0.05, olt; yt; Yt; 0.05 of the total weight; the first coating layer comprises a strontium element, and the second coating layer comprises a boron element. The positive electrode material disclosed by the invention has excellent rate capability, cycle performance and safety performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode material and a preparation method and application thereof. Background technique [0002] The requirement of high energy density for power batteries has promoted the development of high-nickel materials, lithium-sulfur batteries, and lithium-rich manganese-based materials. At present, high-nickel materials are widely used, but high-nickel materials often have disadvantages such as poor cycle performance, low thermal stability and safety, because they are rich in nickel, prone to mixed cations, and transition metal ions are less likely to dissolve out during the use of materials. Seriously lead to the deterioration of the stability of the material structure and cause a series of problems in the battery, such as increased internal resistance, excessive capacity decay, etc.; the high residual alkali of high-nickel materials will cause the transmission path of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/505H01M4/525H01M10/052C01B35/10C01F11/02C01G51/04C01G53/00
CPCY02E60/10
Inventor 王星宁宋文锋
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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