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Battery negative electrode material, preparation method thereof, battery negative electrode and lithium ion battery

A technology of battery negative electrode and battery positive electrode, which is applied to battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of poor stability and cycle performance of lithium ion negative electrodes, and achieves improved uniform load, improved cycle performance, and is not easy to agglomerate. Effect

Pending Publication Date: 2021-07-16
GUANGZHOU AUTOMOBILE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of poor stability and cycle performance of existing lithium ion negative electrodes, the invention provides a battery negative electrode material and a preparation method thereof, a battery negative electrode, and a lithium ion battery

Method used

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  • Battery negative electrode material, preparation method thereof, battery negative electrode and lithium ion battery
  • Battery negative electrode material, preparation method thereof, battery negative electrode and lithium ion battery
  • Battery negative electrode material, preparation method thereof, battery negative electrode and lithium ion battery

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preparation example Construction

[0059] Another embodiment of the present invention provides a method for preparing the battery negative electrode material as described above, comprising the following steps:

[0060] Disperse the porous carbon carrier in a solvent, add tin source and sulfur source, react under hydrothermal conditions, and generate tin-sulfur compounds on the surface of the porous carbon carrier and inside the pores;

[0061] The porous carbon carrier loaded with tin-sulfur compound is mixed with the organic polymer, and heated in a protective atmosphere to carbonize the organic polymer.

[0062] In the preparation method, an organic polymer is used to coat the porous carbon carrier loaded with the tin-sulfur compound, and the organic polymer has good deformation and adhesion ability, which can ensure that the porous carbon carrier loaded with the tin-sulfur compound Comprehensive coating is carried out to improve the bonding strength between the coated carbon layer after subsequent carbonizat...

Embodiment 1

[0098] This embodiment is used to illustrate the negative electrode of the battery disclosed in the present invention, the lithium ion battery and the preparation method thereof, including the following steps:

[0099]Preparation of porous carbon carrier: Add 50g of macroporous acrylic cation exchange resin to 200ml of cobalt chloride aqueous solution with a concentration of 0.2mol / L, stir for 2 hours and then dry to obtain a resin that adsorbs cobalt ions; pulverize the resulting product and add 50g Calcium hydroxide powder, grind and mix evenly; dissolve 50g of potassium hydroxide in 400ml of absolute ethanol to form a potassium hydroxide / ethanol solution, add the product obtained after grinding to the potassium hydroxide / ethanol solution, put it in an 80°C oil bath and stir Evaporate, and when the mixture becomes a paste, put it in an oven at 80°C to continue drying for 12 hours, and then pulverize it again after drying; put the obtained product into a high-temperature furna...

Embodiment 2

[0105] This embodiment is used to illustrate the negative electrode of the battery, the lithium ion battery and the preparation method thereof disclosed in the present invention, including most of the operation steps in Example 1, the difference is:

[0106] In the operation "carbonization of polyacrylonitrile": put the negative electrode of the battery into a tube furnace in a nitrogen atmosphere at a temperature of 400°C for sintering.

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Abstract

In order to solve the problems of poor stability and poor cycle performance of the existing lithium ion negative electrode, the invention provides a battery negative electrode material. The material comprises a porous carbon carrier, a tin-sulfur compound and a coating carbon layer, the tin-sulfur compound is loaded on the surface of the porous carbon carrier and in holes to form a composite material, and the coating carbon layer is coated outside the composite material. Meanwhile, the invention also discloses a preparation method of the battery negative electrode material, a battery negative electrode comprising the battery negative electrode material, and a lithium ion battery. According to the battery negative electrode material provided by the invention, the cycle performance of a battery negative electrode can be effectively improved, the overall conductivity of the battery negative electrode material is improved, and meanwhile, the problem of too fast capacity fading caused by volume expansion in the charging and discharging process of a tin sulfide compound is effectively relieved.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a battery negative electrode material and a preparation method thereof, a battery negative electrode, and a lithium ion battery. Background technique [0002] Lithium batteries have been widely used in all aspects of people's lives, and their energy density has an increasing impact on user experience. Therefore, the development of lithium batteries with high energy density is an inevitable trend. The negative electrode in lithium-ion batteries is generally graphite, and its theoretical gram capacity is 372mAh / g, which has certain restrictions on the future development of lithium batteries. Metal sulfides such as tin disulfide have attracted the attention of researchers because their theoretical gram capacity is twice that of traditional graphite anodes. However, their huge volume expansion during charge and discharge seriously affects the integrity of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5815H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 胡倩倩洪晔董海勇长世勇吴春宇王津松
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD