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A lithium-ion battery multi-component lithium-rich positive electrode material and its preparation method and application

A lithium-rich positive electrode material, lithium-ion battery technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of poor rate performance, poor cycle stability, low Coulombic efficiency, etc., to achieve high specific capacity, crystallization Good, good cycle stability effect

Active Publication Date: 2017-08-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the actual commercial lithium-ion batteries, there are still some disadvantages in the multi-element lithium-rich materials, mainly in the low initial Coulombic efficiency, poor rate performance, and poor cycle stability.

Method used

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  • A lithium-ion battery multi-component lithium-rich positive electrode material and its preparation method and application
  • A lithium-ion battery multi-component lithium-rich positive electrode material and its preparation method and application
  • A lithium-ion battery multi-component lithium-rich positive electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Mix 2.4g polyvinylpyrrolidone (PVP), 10g ethanol, 0.25g silane coupling agent KH570 and 4g deionized water to obtain a mixed system;

[0048] (2) Under stirring conditions, drop the mixed monomer (0.02g azobisisobutyronitrile AIBN, 3g acrylonitrile AN, 1.3g styrene St), metal salt solution and sodium carbonate solution, continue to stir 2h after dropping; Wherein, metal salt solution is 2.45g manganese acetate Mn (CH 3 COO) 2 4H 2 O, 0.83g nickel acetate Ni(CH 3 COO) 2 4H 2 O and 0.83g cobalt acetate Co(CH 3 COO) 24H 2 O is prepared by dissolving in 50mL of ethanol aqueous solution, the sodium carbonate solution is 2.12g sodium carbonate Na 2 CO 3 Prepared by dissolving in 60mL ethanol aqueous solution, in the ethanol aqueous solution, the volume ratio of ethanol and water is 2:1;

[0049] (3) add initiator benzoyl peroxide (BPO) ethanol solution (0.05gBPO, 5g ethanol) in the reaction system in step (2), in N 2 Under protection, polymerize at 70°C for 6 h...

Embodiment 2

[0054] (1) Mix 2.4g polyvinylpyrrolidone PVP, 10g ethanol, 0.25g silane coupling agent KH570 and 4g deionized water to obtain a mixed system;

[0055] (2) Under stirring conditions, drop the mixed monomer (0.02g azobisisobutyronitrile AIBN, 3g acrylonitrile AN, 1.3g styrene St), metal salt solution and sodium carbonate solution dropwise continue to stir 2h; Wherein, metal salt solution is 1.69g manganese sulfate MnSO H 2 O, 0.87g nickel sulfate NiSO4 6H 2 O, 0.93g cobalt sulfate CoSO4 7H 2 O is prepared by dissolving in 50mL of ethanol aqueous solution, the sodium carbonate solution is 2.12g sodium carbonate Na 2 CO 3 Prepared by dissolving in 60mL ethanol aqueous solution, in the ethanol aqueous solution, the volume ratio of ethanol and water is 2:1;

[0056] (3) add initiator benzoyl peroxide (BPO) ethanol solution (0.05gBPO, 5g ethanol) in the reaction system in step (2), in N 2 Under protection, polymerize at 100°C for 5 hours; separate the product, wash and dry to ob...

Embodiment 3

[0061] (1) Mix 2.4g polyvinylpyrrolidone PVP, 10g ethanol, 0.25g silane coupling agent KH570 and 4g deionized water to obtain a mixed system;

[0062] (2) Under stirring conditions, drop the mixed monomer (0.02g azobisisobutyronitrile AIBN, 3g acrylonitrile AN, 1.3g styrene St), metal salt solution and sodium carbonate solution, continue to stir 2h after dropping; Wherein, metal salt solution is 2.45g manganese acetate Mn (CH 3 COO) 2 4H 2 O, 0.83g nickel acetate Ni(CH 3 COO) 2 4H 2 O and 0.83g cobalt acetate Co(CH 3 COO) 2 4H 2 O is prepared by dissolving in 50mL of ethanol aqueous solution, the sodium carbonate solution is 2.12g sodium carbonate Na 2 CO 3 Prepared by dissolving in 60mL ethanol aqueous solution, in the ethanol aqueous solution, the volume ratio of ethanol and water is 2:1;

[0063] (3) add initiator benzoyl peroxide (BPO) ethanol solution (0.05gBPO, 5g ethanol) in the reaction system in step (2), in N 2 Under protection, polymerize at 70°C for 6 ho...

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Abstract

The invention belongs to the technical field of energy new materials, and particularly relates to a lithium ion battery multi-element lithium-rich positive electrode material and a preparation method and application thereof. The method includes the steps of evenly mixing a dispersing agent povidone, a silane coupling agent and solvent to obtain a mixing system, dropwise adding mixed monomers, a metal salt solution and a sodium carbonate solution in the mixing system under the stirring condition at the same time, continuing to conduct stirring for 2-5 h after dropwise adding, adding an initiator benzoyl peroxide, conducting the polymerization reaction for 5-24 h at a temperature of 50-100 DEG C under the protection of N2, conducting product separation, washing and drying to obtain a precursor, and sintering the precursor and lithium salt at a high temperature to obtain the lithium ion battery multi-element lithium-rich positive electrode material. The in-situ aggregation method and the coprecipitation method are integrated, the process is simple, operation is convenient, product crystallizing is good, primary particle granularity is small, and the advantages of being excellent in electrochemical performance, high in specific capacity and high in circulation stability are presented.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a lithium-ion battery multi-element lithium-rich positive electrode material and a preparation method and application thereof. Background technique [0002] In recent years, with the sustained and rapid development of my country's national economy, problems such as lack of energy resources, irrational structure, and serious environmental pollution have become increasingly prominent. Energy conservation, improvement of energy efficiency, and development and development of new alternative energy sources that are safe and environmentally friendly will become future energy resources. It is also an important direction for my country's priority development. With the development of the automobile industry, non-renewable fossil fuels such as oil and natural gas are increasingly depleted, and are likely to cause global problems such as air pollution and room temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 马少蒙侯贤华
Owner SOUTH CHINA NORMAL UNIVERSITY