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A method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material

A negative electrode material, antimony doping technology, used in battery electrodes, structural parts, electrical components, etc., can solve the problems of electrode material deformation and cracking, poor cycle performance, failure and other problems, to reduce expansion characteristics, improve surface defects, time short effect

Active Publication Date: 2021-06-25
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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  • A method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material
  • A method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material

Examples

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Embodiment 1

[0022] A method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material, comprising 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 mix them by dry ball milling for 1 hour; then place them in an atmosphere furnace for heat treatment, temperature at 5°C / min to 800°C 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) Composite granulation of tin dioxide modified product and graphite: sieve the tin dioxide modified product with 400 meshes, take the undersize material and mix it with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer at 25hz 1h, the ratio is graphite: tin dioxide modified product: asphalt: phenolic resin = 100: 15: 10: 5; put the mixture into an isostatic pressing device and increase the pressure to 150MPa at a...

Embodiment 2

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

[0030] (1) Doping modification of tin dioxide: Weigh a certain weight of tin dioxide, copper and antimony in a ratio of 100:5:12 and perform 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 700° C. for 1 hour at 3° C. / min; cooled to room temperature to obtain a modified product; the D50 of the tin dioxide, copper and antimony are all 1-3 μm.

[0031](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 it with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer at 25hz 0.5h, the ratio is graphite: tin dioxide modified product: asphalt: phenolic resin = 100: 15: 5: 3; put the mixture in an isostatic press and increase th...

Embodiment 3

[0035] A method for preparing copper-antimony-doped tin-carbon lithium ion negative electrode material, comprising 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 mix them by dry ball milling for 0.7h; then place them in an atmosphere furnace for heat treatment, Under protection, the temperature is raised to 900° C. for 3 hours at a rate of 4° C. / min; cooled to room temperature to obtain a modified product; the D50 of the tin dioxide, copper and antimony are all 1-3 μm.

[0037] (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 it with graphite, asphalt and phenolic resin in proportion with a V-shaped mixer at 25hz 1.2h, the ratio is graphite: tin dioxide modified product: asphalt: phenolic resin = 100: 15: 12: 12; put the mixture in an isostatic pressure dev...

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Abstract

The invention discloses a method for preparing copper-antimony-doped tin-carbon-lithium ion anode materials, which includes the following steps: (1) tin dioxide doping modification: weighing a certain weight of tin dioxide, copper and antimony 100:(5-20):(5-20) ratio for dry ball milling and mixing for 0.5-1.5h; (2) Composite granulation of tin dioxide modified products and graphite; (3) Secondary coating modification . The present invention adopts copper and antimony to carry out doping modification to tin dioxide, reduces the expansion characteristic of tin-carbon composite, improves cycle performance; Short, simple process, easy to realize industrialized large-scale production; at the same time realize the advantages of granulation between tin dioxide and graphite, graphite and graphite, and can realize the function of surface modification of tin dioxide and graphite; adopt secondary packaging Coating can significantly improve the surface defects generated in the secondary granulation process, and improve the first-time efficiency and cycle performance of the product.

Description

technical field [0001] The invention relates to the technology in the field of negative electrode materials, in particular to a method for preparing copper-antimony-doped 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 hi...

Claims

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Application Information

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Patent Type & Authority Patents(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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