A kind of graphene high-energy lithium battery composite positive electrode slurry and preparation method thereof

A composite cathode and graphene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance and stability, easy heating during use, and reduced energy storage of lithium batteries, and achieve high capacity stability, The effect of high dispersion and reduction of pole piece resistance

Active Publication Date: 2019-10-29
上海玖银电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a graphene high-energy lithium battery composite positive electrode slurry and its preparation method, to solve the problem that the positive electrode slurry used in the prior art leads to the reduction of lithium battery energy storage, poor cycle performance and stability, resulting in easy heating during use, Technical issues with shortened lifetime and reduced utilization

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  • A kind of graphene high-energy lithium battery composite positive electrode slurry and preparation method thereof
  • A kind of graphene high-energy lithium battery composite positive electrode slurry and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A graphene high-energy lithium battery composite cathode slurry, which is prepared by mixing an active material, a dispersant, a binder, a conductive agent, and a solvent at a weight ratio of 6:2:1:1.5:15.

[0032] The active material is composed of the following raw materials in parts by weight: 10 parts of modified lithium iron phosphate, 5 parts of lithium cobaltate, and 6 parts of lithium nickelate.

[0033]The dispersant is composed of the following raw materials in parts by weight: 3 parts of sodium polyacrylate, 2 parts of fatty alcohol polyoxyethylene ether, and 0.5 part of sodium lignosulfonate.

[0034] The binder is composed of the following raw materials in parts by weight: 1 part of gelatin, 3 parts of modified polyacrylate.

[0035] The conductive agent is composed of the following raw materials in parts by weight: 0.5 parts of cobalt disulfide, 10 parts of graphene, 2.5 parts of nano-carbon fibers, 2.5 parts of acetylene black, and 20 parts of butyrolacto...

Embodiment 2

[0046] A graphene high-energy lithium battery composite cathode slurry is prepared by mixing active materials, dispersants, binders, conductive agents, and solvents according to a weight ratio of 9:4:3:2.5:20.

[0047] The active material is composed of the following raw materials in parts by weight: 20 parts of modified lithium iron phosphate, 8 parts of lithium cobaltate, and 9 parts of lithium nickelate.

[0048] The dispersant is composed of the following raw materials in parts by weight: 7 parts of sodium polyacrylate, 4 parts of fatty alcohol polyoxyethylene ether, and 1.5 parts of sodium lignosulfonate.

[0049] The binder is composed of the following raw materials in parts by weight: 2 parts of gelatin, 5 parts of modified polyacrylate.

[0050] The conductive agent is composed of the following raw materials in parts by weight: 1.2 parts of cobalt disulfide, 15 parts of graphene, 4 parts of nano-carbon fibers, 3.5 parts of acetylene black, and 30 parts of butyrolactone...

Embodiment 3

[0061] A graphene high-energy lithium battery composite cathode slurry, which is prepared by mixing an active material, a dispersant, a binder, a conductive agent, and a solvent at a weight ratio of 7.5:3:2:2:17.5.

[0062] The active material is composed of the following raw materials in parts by weight: 20 parts of modified lithium iron phosphate, 8 parts of lithium cobaltate, and 9 parts of lithium nickelate.

[0063] The dispersant is composed of the following raw materials in parts by weight: 7 parts of sodium polyacrylate, 4 parts of fatty alcohol polyoxyethylene ether, and 1.5 parts of sodium lignosulfonate.

[0064] The binder is composed of the following raw materials in parts by weight: 2 parts of gelatin, 5 parts of modified polyacrylate.

[0065] The conductive agent is composed of the following raw materials in parts by weight: 1.2 parts of cobalt disulfide, 15 parts of graphene, 4 parts of nano-carbon fibers, 3.5 parts of acetylene black, and 30 parts of butyrola...

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Abstract

The invention provides compound cathode slurry of graphene high-power lithium batteries, relates to the technical field of cathode slurry of lithium batteries and aims to solve the technical problems that cathode slurry used in the prior art causes reduced energy storage capacity and poor cycle performance and stability of the lithium batteries, as a result, the lithium batteries easily heat and are short in service life and low in utilization rate during usage. Thus, the invention provides the compound cathode slurry of graphene high-power lithium batteries. Compared with traditional cathode slurry for the lithium batteries, the prepared compound cathode slurry has the battery capacity reduced from 195.256 mAh / g to 193.658 mAh / g and the capacity retention rate up to 99.18% under the conditions that the temperature is 35 DGE C and 1C charge and 6C discharge are circulated 500 times, the discharge specific capacity and attenuation resistance are improved, and the high cycle life and high capacity stability are realized.

Description

technical field [0001] The invention relates to the technical field of lithium battery positive electrode slurry, in particular, to a graphene high-energy lithium battery composite positive electrode slurry and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable devices such as mobile phones, notebook computers, and digital electronic products because of their high energy density, long cycle life, and environmental friendliness. However, with the development of electronic devices towards miniaturization and weight reduction, the requirements for the specific capacity, cycle life, and rate characteristics of the positive and negative electrode pastes of lithium-ion batteries are getting higher and higher. The existing lithium battery pastes can no longer meet the needs of the market in terms of stability and cycle life. [0003] Lithium-ion battery cathode slurry occupies a core position in lithium batteries. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/525H01M4/5825H01M4/62H01M4/622H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner 上海玖银电子科技有限公司
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