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Multiple doped carbon cathode active material and negative electrode used for lithium battery as well as preparation method thereof

A negative electrode active material and lithium battery technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as poor cycle performance and low energy density, and achieve high energy density, good voltage platform, and easy access

Inactive Publication Date: 2012-06-13
TIANJIN DERUI FENGKAI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a multi-element doped carbon negative electrode active material for lithium batteries, a negative electrode and a preparation method thereof, using a multi-element doped carbon negative electrode active material to replace the traditional graphite-based negative electrode material, Solve the problems of low energy density and poor cycle performance of traditional lithium batteries

Method used

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  • Multiple doped carbon cathode active material and negative electrode used for lithium battery as well as preparation method thereof
  • Multiple doped carbon cathode active material and negative electrode used for lithium battery as well as preparation method thereof
  • Multiple doped carbon cathode active material and negative electrode used for lithium battery as well as preparation method thereof

Examples

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Embodiment 1

[0022] With resorcinol and formaldehyde as reactant, resorcinol and formaldehyde are mixed with the molar ratio of 1:2, with the sodium carbonate solution of 0.05mol / L as catalyst, the mol ratio of resorcinol and sodium carbonate is 1500, deionized water was used as solvent, the mass fraction of the solution was 30%, stirred evenly, sealed and placed in an oven, and treated at 30°C, 50°C, and 90°C for 1 day, 2 days, and 3 days respectively, and finally RF organic moisture was generated. gel. The samples were soaked in acetone for solvent exchange for 72 hours, during which time the acetone was changed every 24 hours. After the natural volatilization of acetone is complete, the organic airgel (RF) is obtained. Afterwards, carbonization is carried out under the protection of nitrogen according to a certain carbonization curve to obtain a carbon airgel material (CRF) with a nanoporous structure. The obtained carbon airgel material has a pore size of 28nm and a specific surface ...

Embodiment 2

[0026] With resorcinol and formaldehyde as reactant, resorcinol and formaldehyde are mixed with the molar ratio of 1:2, with the sodium carbonate solution of 0.05mol / L as catalyst, the mol ratio of resorcinol and sodium carbonate is 1000, deionized water was used as a solvent, and the mass fraction of the solution was 50%, and the steps in Example 2 were repeated to obtain carbon airgel (CRF) with a nanoporous structure. The obtained carbon airgel material has a pore size of 8.2nm and a specific surface area of ​​571m 2 / g, and the resistivity is 0.157Ω·cm.

[0027] The prepared porous carbon airgel, graphite, superconducting carbon black, and binder polyvinylidene fluoride are prepared according to the existing negative electrode active material production process to prepare multi-component doped carbon negative electrode active materials for lithium batteries.

[0028]A preparation of a lithium battery negative electrode using a multi-component doped carbon negative electro...

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Abstract

The invention relates to a multiple doped carbon cathode active material and a negative electrode used for a lithium battery as well as a preparation method thereof. The multiple doped carbon cathode active material comprises the following ingredients by weight percentage: 5-30% of nano porous carbon aerogel, 50-90% of graphite, 1-5% of superconductive carbon black and 3-10% of binder polyvinylidene fluoride. According to the invention, the multiple doped carbon cathode active material is capable of placing a traditional graphite-base cathode material and can be practically used on the lithium ion battery cathode, the advantages of the traditional graphite-base cathode and nano porous charcoal electrode are combined, so that the problems of low energy density and poor circulation performance of a traditional lithium battery can be solved, and high energy density and a good voltage flat can be provided; the traditional lithium ion battery cathode preparation technology is employed, the production process is simple and easy to operate; the raw materials of the carbon doped cathode active material are easy to acquire, so that the method of the invention is in favor of industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a multi-component doped carbon negative electrode active material for lithium batteries, a negative electrode and a preparation method thereof. Background technique [0002] In the electronic information age, the demand for mobile power is growing rapidly. Due to the characteristics of high voltage, high capacity, long cycle life and good safety performance, lithium-ion batteries have broad application prospects in portable electronic equipment, electric vehicles, space technology, defense industry, etc., and have become widely used in recent years. research hotspots. Although small rechargeable lithium-ion batteries using carbon electrodes have been commercialized and widely used, how to further improve specific energy, specific power (discharge current), cycle life, and reduce costs still needs to be resolved. The recent global environmental protection declarati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 沈军关大勇赵凯
Owner TIANJIN DERUI FENGKAI NEW MATERIAL TECH
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