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Method for preparing cathode material of tin-carbon lithium ion cathode material

A negative electrode material, lithium ion technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of electrode material deformation and cracking, poor cycle performance, failure, etc., to reduce expansion characteristics, improve surface defects, and shorten the time. Effect

Active Publication Date: 2018-09-04
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest problem with tin-based materials at present is the poor cycle performance, which is mainly due to the fact that the volume of Sn will change greatly during the alloying / dealloying process with Li, which will lead to gradual deformation and cracking of the electrode material, and then pulverization. , failure

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  • Method for preparing cathode material of tin-carbon lithium ion cathode material
  • Method for preparing cathode material of tin-carbon lithium ion cathode material

Examples

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Effect test

Embodiment 1

[0023] A method for preparing a tin-carbon lithium ion negative electrode material, comprising the following steps:

[0024] (1) Doping modification of tin dioxide: Weigh a certain weight of nano tin dioxide and cuprous oxide at a ratio of 100:30 and mix them by dry ball milling for 1 hour; then place them in an atmosphere furnace for carbothermal reduction, Under protection, the temperature was raised at 5°C / min to 800°C for 2 hours at a constant temperature; cooled to room temperature, a tin dioxide modified product was obtained.

[0025] (2) Composite granulation of tin dioxide modified product and graphite: sieve the tin dioxide modified product with 400 meshes, take the undersize material and mix with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer at 25Hz 1h, the ratio is graphite: tin dioxide modified product: pitch: phenolic resin = 100: 15: 10: 5; put the mixture into a molding machine for briquetting at 18MPa, and then put the molding materia...

Embodiment 2

[0030] A method for preparing a tin-carbon lithium ion negative electrode material, comprising the following steps:

[0031] (1) Doping modification of tin dioxide: Weigh a certain weight of nano tin dioxide and cuprous oxide in a ratio of 100:10 for dry ball milling and mixing for 1 hour; then place in an atmosphere furnace for carbothermal reduction, Under protection, the temperature was raised at 5°C / min to 700°C for 2 hours, and then cooled to room temperature to obtain a tin dioxide modified product.

[0032] (2) Composite granulation of tin dioxide modified product and graphite: sieve the tin dioxide modified product with 400 meshes, take the undersize material and mix with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer at 25 Hz 1h, the ratio is graphite: tin dioxide modified product: pitch: phenolic resin = 100: 15: 5: 3; put the mixture into a molding machine for briquetting at 15MPa, and then put the molding material into the roasting chamber...

Embodiment 3

[0036] A method for preparing a tin-carbon lithium ion negative electrode material, comprising the following steps:

[0037] (1) Doping modification of tin dioxide: Weigh a certain weight of nano-tin dioxide and cuprous oxide at a ratio of 100:50 and mix them by dry ball milling for 1 hour; then place them in an atmosphere furnace for carbothermal reduction, Under protection, the temperature was raised at 5°C / min to 950°C for 2 hours, then cooled to room temperature to obtain a tin dioxide modified product.

[0038] (2) Composite granulation of tin dioxide modified product and graphite: sieve the tin dioxide modified product with 400 meshes, take the undersize material and mix with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer at 25Hz 1h, the ratio is graphite: tin dioxide modified product: pitch: phenolic resin = 100: 15: 15: 12; put the mixture into a molding machine for briquetting at 19MPa, and then put the molding material into the roasting cham...

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Abstract

The invention discloses a method for preparing a cathode material of tin-carbon lithium ion cathode material. The method comprises the following steps: (1) performing doping modification on tin dioxide, namely weighing certain amounts of nano tin dioxide and red copper oxide in a ratio of 100:(10-50), performing dry-method ball milling for 1 hour; and performing carbon heat reduction in an atmosphere furnace; (2) performing composite pelletizing on a tin dioxide modification product with graphite; (3) performing secondary wrapping modification. According to the method, as the tin dioxide is subjected to doping modification with the red copper oxide, the expansion property of a tin-carbon compound can be degraded, and the circulation property can be improved; due to two times of pelletization with processes of molding, roasting and dispersion formation, the method is short in time, simple in process and easy in industrial large-scale production; meanwhile, advantages of pelletization oftin dioxide and graphite and graphite and graphite can be achieved, and a function of surface modification upon the graphite with the tin dioxide can be also achieved; due to two times of coating, surface defects caused in the two times of pelletization process can be remarkably alleviated, and the first efficiency and the circulation property of a product can be improved.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a method for preparing tin-carbon lithium ion negative electrode materials. Background technique [0002] With the development of science and technology and the progress of society, people's demand for secondary batteries with high specific energy, high power, long life, safety and environmental protection is increasing day by day. Traditional carbon anode materials can no longer meet the high-energy and high-power requirements of the new generation of lithium-ion batteries, so it is of great significance to develop new high-capacity non-carbon anode materials. [0003] At present, the actual capacity of graphite materials is close to the theoretical capacity (372mAh / g), and the room for further improvement is very limited; metal Sn and its oxides can form alloys with Li, and the theoretical capacity is 994 mAh / g, which is the highest capacity of grap...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/48H01M4/625Y02E60/10
Inventor 蓝绿灿赵东辉周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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