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A modified graphene-doped lithium cobalt oxide electrode material and preparation method thereof

An electrode material, graphene technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high price, restricted development prospects, lack of manganese resources, etc., and achieve the effect of good safety performance and excellent cycle performance.

Active Publication Date: 2019-01-22
江苏天煌照明集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since the commercialization of lithium-ion batteries, most of the positive electrode materials used in lithium-ion batteries are lithium cobaltate, lithium cobaltate or ternary materials, etc., and its components are mainly active materials plus conductive agents and then binders. The active materials It is lithium cobaltate, lithium cobaltate or ternary, etc.; most of the negative electrode materials use graphite as the active material, and then add some conductive agent and binder; its advantages are high capacity and long cycle life, but manganese resources are scarce and expensive And it is toxic, so it is an important research direction for lithium-ion batteries to seek cheap, reliable, and environmentally friendly cathode materials.
Spinel-type positive electrode materials represented by lithium cobaltate and layered oxides of ternary materials have been widely studied in the past decade, but their development prospects are restricted by their respective defects.

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  • A modified graphene-doped lithium cobalt oxide electrode material and preparation method thereof
  • A modified graphene-doped lithium cobalt oxide electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] A lithium cobaltate electrode material doped with modified graphene, the main raw materials in parts by weight are: 30 parts of modified graphene, 28 parts of lithium cobaltate, 12 parts of lithium iron phosphate, 8 parts of acrylonitrile, and nitropyridine 4 parts, 2 parts of sulfosalicylic acid; The preparation method of described modified graphene is: react with dimethyl sulfoxide, dextran after graphene oxidation treatment, then every 5min successively with methyl acrylate, The reaction of melamine, polyvinyl alcohol and glyceryl amine is obtained by vacuum filtration and drying; the purity of the graphene is more than 99.9%; the mesh number of the lithium cobaltate is 800 mesh; the mesh number of the lithium iron phosphate is 1200 head.

[0020] A preparation method of a lithium cobaltate electrode material doped with modified graphene, the specific steps are:

[0021] (1) First, stir the modified graphene with lithium cobaltate and lithium iron phosphate, add con...

Embodiment 2

[0024] A lithium cobaltate electrode material doped with modified graphene, the main raw materials in parts by weight are: 33 parts of modified graphene, 34 parts of lithium cobaltate, 13 parts of lithium iron phosphate, 8 parts of acrylonitrile, and nitropyridine 4 parts, 2 parts of sulfosalicylic acid; The preparation method of described modified graphene is: react with dimethyl sulfoxide, dextran after graphene oxidation treatment, then every 5min successively with methyl acrylate, The reaction of melamine, polyvinyl alcohol and glyceryl amine is obtained by vacuum filtration and drying; the purity of the graphene is more than 99.9%; the mesh number of the lithium cobaltate is 800 mesh; the mesh number of the lithium iron phosphate is 1200 head.

[0025] A preparation method of a lithium cobaltate electrode material doped with modified graphene, the specific steps are:

[0026] (1) First, stir the modified graphene with lithium cobaltate and lithium iron phosphate, add con...

Embodiment 3

[0029] A lithium cobaltate electrode material doped with modified graphene, the main raw materials in parts by weight are: 35 parts of modified graphene, 38 parts of lithium cobaltate, 15 parts of lithium iron phosphate, 9 parts of acrylonitrile, and nitropyridine 5 parts, 5 parts of sulfosalicylic acid; The preparation method of described modified graphene is: react with dimethyl sulfoxide, dextran after graphene oxidation treatment, then every 5min successively with methyl acrylate, The reaction of melamine, polyvinyl alcohol and glyceryl amine is obtained by vacuum filtration and drying; the purity of the graphene is more than 99.9%; the mesh number of the lithium cobaltate is 800 mesh; the mesh number of the lithium iron phosphate is 1200 head.

[0030] A preparation method of a lithium cobaltate electrode material doped with modified graphene, the specific steps are:

[0031] (1) First, stir the modified graphene with lithium cobaltate and lithium iron phosphate, add con...

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Abstract

The invention discloses a modified graphene-doped lithium cobalt oxide electrode material and a preparation method thereof. The modified graphene-doped lithium cobalt oxide electrode material is prepared from the following components in parts by weight: 30-40 parts of modified graphene, 28-44 parts of lithium cobalt oxide, 12-18 parts of lithium iron phosphate, 8-10 parts of acrylonitrile, 4-6 parts of nitropyridine and 2-6 parts of sulfosalicylic acid. A prepared lithium ion battery has excellent cycle performance, and the capacity for 2000 times of 1C charging and discharging cycle at normal temperature is maintained to be more than 90%; the capacity for 6C discharging is more than 98% of 1C capacity; the battery cannot break out a fire or explode under a 3C / 10V overcharging test; the cycle performance under high temperature is excellent, and the capacity for 1000 times of 1C charging and discharging cycle at the temperature of 60 DEG C is maintained to be more than 88%; and the battery has good safety performance, and cannot explode or break out a fire in the tests of needling, extrusion, overcharging, overdischarging and the like.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a modified graphene-doped lithium cobalt oxide electrode material and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries, most of the positive electrode materials used in lithium-ion batteries are lithium cobaltate, lithium cobaltate or ternary materials, etc., and its components are mainly active materials plus conductive agents and then binders. The active materials It is lithium cobaltate, lithium cobaltate or ternary, etc.; most of the negative electrode materials use graphite as the active material, and then add some conductive agent and binder; its advantages are high capacity and long cycle life, but manganese resources are scarce and expensive And it is toxic, so it has become an important research direction for lithium-ion batteries to seek cheap, reliable, and environmentally friendly cathode materials. Sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M10/0525
CPCH01M4/362H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 田野王永利王延峰
Owner 江苏天煌照明集团有限公司