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A kind of positive electrode material, its preparation method and application

A cathode material, block copolymer technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of poor internal conductivity and poor cycle performance, and achieve improved electrical conductivity, small increase in electrical conductivity, and electrical conductivity. boosted effect

Active Publication Date: 2021-12-24
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of the positive electrode material active material with a three-dimensional conductive network prepared by the method has good conductivity, but its internal conductivity is poor, and then the cycle performance is poor

Method used

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  • A kind of positive electrode material, its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A kind of preparation method of cathode material comprises the steps:

[0063] (1) According to the molecular formula Li 1.2 mn 0.64 Ni 0.08 co 0.08 o 2 Weigh lithium chloride, manganese chloride, nickel chloride and cobalt chloride in molar ratio, add deionized water to dissolve and prepare the mixed solution that the molar concentration of metal ion is 0.2mol / L;

[0064] (2) According to the mass ratio of the block copolymer and the transition metal salt as 1:1, a block copolymer solution with a mass concentration of 0.1 g / L is added to the mixed solution, and the block copolymer solution contains The block copolymer is polyethylene oxide-poly 1,4,7,10,13,16-hexaazacyclooctadecylethyleneimine with a relative molecular mass of 6000g / mol, wherein polyethylene oxide The relative molecular mass of poly-1,4,7,10,13,16-hexaazacyclooctadecylethyleneimine is 1000g / mol, and the block copolymer solution The solvent in is hexadecyltrimethylammonium bromide, which is stirre...

Embodiment 2

[0067] The difference from Example 1 is that the mass ratio of the block copolymer to the transition metal salt in step (2) is 0.5:1.

Embodiment 3

[0069] The difference from Example 1 is that the mass ratio of the block copolymer to the transition metal salt in step (2) is 5:1.

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Abstract

The present invention relates to a kind of cathode material, its preparation method and application, the preparation method of described cathode material comprises the following steps: (1) add block copolymer solution in the mixed solution containing manganese salt, lithium salt and transition metal salt , to obtain a precursor solution; (2) precipitating the precursor solution, and obtaining a positive electrode material after calcining. The two ends of the block copolymer of the present invention have different groups. On the one hand, the hydrophilic group is beneficial to its dissolution in the precursor solution, and then the carbon coating layer formed and the carbon layer distributed between the primary particles The carbon material has good performance, which is conducive to improving the conductivity of the positive electrode material; on the other hand, by selecting mineralized groups at the other end of the block copolymer that can regulate the structure, size and morphology of the crystal, the resulting positive electrode The material has a specific shape and size, and by exposing more crystal faces that are conducive to the transmission of lithium ions, the diffusion rate of lithium ions is increased and the electrochemical performance is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a positive electrode material, a preparation method and an application thereof. Background technique [0002] my country's "National Plan for Energy Conservation and New Energy Vehicles (2012-2020)" proposes that by 2020, the mass density of battery modules will reach more than 300Wh / kg, and the cost will drop to 1.5 yuan / Wh. At present, the mainstream lithium-ion battery cathode materials in the market mainly include lithium manganese oxide, lithium iron phosphate, ternary material high-voltage lithium nickel manganese oxide, etc. The specific capacity of these lithium-ion battery cathode materials is below 200mAh / g, and the working voltage is below 4V. , unable to meet the high-voltage, high-capacity, and low-cost development requirements of future new energy vehicle power batteries. [0003] The specific capacity of lithium-rich manganese-based cathode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 谭强强纪雪倩
Owner LANGFANG GREEN IND TECH CENT