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Method for preparing copper-antimony-doped tin-carbon-lithium ion cathode material

A negative electrode material, antimony doping technology, applied in the field of negative electrode material, can solve the problems of electrode material deformation and cracking, poor cycle performance, pulverization, etc., and achieve the effects of reducing expansion characteristics, improving surface defects, and shortening time

Active Publication Date: 2018-11-13
SHENZHEN XIANGFENGHUA TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

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Embodiment 1

[0022] A method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material includes the following steps:

[0023] (1) Doping modification of tin dioxide: weigh a certain weight of tin dioxide, copper and antimony at a ratio of 100:10:10 and dry ball milling and mixing for 1 hour; then place it in an atmosphere furnace for heat treatment and protect it under nitrogen The temperature is raised to 800°C at a constant temperature of 5°C / min for 2 hours; cooled to room temperature to obtain a modified product; the D50 of the tin dioxide, copper and antimony are all 1-3 μm.

[0024] (2) Compound granulation of tin dioxide modified product and graphite: the tin dioxide modified product is sieved through 400 mesh, and the sieve is taken and mixed with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer 25hz 1h, the ratio is graphite: tin dioxide modified product: asphalt: phenolic resin = 100: 15: 10: 5; put the mixture into an isostatic pre...

Embodiment 2

[0029] A method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material includes the following steps:

[0030] (1) Doping modification of tin dioxide: weigh a certain weight of tin dioxide, copper and antimony at a ratio of 100:5:12 and dry ball milling and mixing for 0.5h; then place it in an atmosphere furnace for heat treatment, Under protection, the temperature is raised to a constant temperature of 700°C at 3°C / min for 1 hour; and the modified product is obtained by cooling to room temperature; the D50 of the tin dioxide, copper and antimony are all 1-3 μm.

[0031] (2) Compound granulation of tin dioxide modified product and graphite: the tin dioxide modified product is sieved through 400 mesh, and the sieve is taken and mixed with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer 25hz 0.5h, the ratio is graphite: tin dioxide modified product: asphalt: phenolic resin = 100: 15: 5: 3; put the mixture into the isostatic equi...

Embodiment 3

[0035] A method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material includes the following steps:

[0036] (1) Doping modification of tin dioxide: weigh a certain weight of tin dioxide, copper and antimony at a ratio of 100:15:5 and dry ball milling and mixing for 0.7h; then place it in an atmosphere furnace for heat treatment. Under protection, the temperature is raised to a constant temperature of 900°C at 4°C / min for 3 hours; and the modified product is obtained by cooling to room temperature; the D50 of the tin dioxide, copper and antimony are all 1-3 μm.

[0037] (2) Compound granulation of tin dioxide modified product and graphite: the tin dioxide modified product is sieved through 400 mesh, and the sieve is taken and mixed with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer 25hz 1.2h, the ratio is graphite: tin dioxide modified product: asphalt: phenolic resin = 100: 15: 12: 12; put the mixture into the isostatic e...

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Abstract

The invention discloses a method for preparing a copper-antimony-doped tin-carbon-lithium ion cathode material. The method comprises the following steps: (1) carrying out doping modification on tin dioxide, namely weighing certain amounts of tin dioxide, copper and antimony, and carrying out dry-method ball-milling mixing for 0.5-1.5 hours in a ratio of 100:(5-20):(5-20); (2) carrying out composite pelletizing on a tin dioxide modified product and graphite; (3) carrying out secondary coating modification. By adopting the method, copper and antimony are adopted to carry out doping modificationon the tin dioxide, so that the expansion properties of a tin-carbon compound can be degraded, and circulation properties can be improved; secondary pelletizing is carried out through isostatic compaction, roasting and dispersion shaping processes, and the method is short in time, simple in process and easy in industrial large-scale production; meanwhile, the advantage of pelletizing of tin dioxide and graphite and graphite and graphite can be taken into play, and a function that surface modification of the graphite with the tin dioxide can be also achieved; due to two times of coating, surface defects caused in a secondary pelletizing process can be remarkably alleviated, and the first-time frequency and the circulation properties of a product can be improved.

Description

Technical field [0001] The present invention relates to the field of negative electrode material technology, in particular to a method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material. 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. Traditional carbon anode materials can no longer meet the high-energy and high-power requirements of the new generation of lithium-ion batteries, so the development of new high-capacity non-carbon anode materials is of great significance. [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 equivalent of gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 蓝绿灿赵东辉周鹏伟
Owner SHENZHEN XIANGFENGHUA TECH CO LTD
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