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Silicon carbon negative electrode material and its preparation method, application and prepared lithium ion battery

A negative electrode material, silicon carbon technology, applied in the field of silicon carbon negative electrode material and its preparation, can solve the problems of complex preparation steps, poor low temperature performance, low lithium intercalation rate, etc. small effect

Active Publication Date: 2021-09-03
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a silicon-carbon negative electrode material and its preparation method, application and fabricated lithium-ion batteries

Method used

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  • Silicon carbon negative electrode material and its preparation method, application and prepared lithium ion battery
  • Silicon carbon negative electrode material and its preparation method, application and prepared lithium ion battery
  • Silicon carbon negative electrode material and its preparation method, application and prepared lithium ion battery

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Effect test

Embodiment 1

[0042] The silicon oxide material (purity>99.9%, mass percentage, Beijing Shengbogaotai Optical Technology Co., Ltd.) was crushed into silicon oxide powder with a median particle size of 4 μm by jet milling. According to silicon oxide powder: polyethylene (PE, Shanghai Bangtao Plastic Raw Materials Factory, molecular weight 3000): paraffin oil (Suzhou Hesen Special Oil Co., Ltd.) = 8:2:1.5 (weight ratio), the silicon oxide powder and Add PE and paraffin oil into the internal mixer, carry out melt blending treatment at 120°C for 5 minutes, and obtain the master batch after the end; use the extraction system to extract the pore-forming material in the master batch with dichloromethane (Shandong Sanshun Chemical Co., Ltd.). The solvent (that is, paraffin oil) is extracted and separated, and the masterbatch after extraction is heated up to 800°C at 5°C / min under the protection of nitrogen, and after heat treatment for 2 hours, the discharge is sieved (the mesh number of the screen ...

Embodiment 2

[0044] The silicon oxide material (purity>99.9%, mass percentage, Beijing Shengbogaotai Optical Technology Co., Ltd.) was crushed into silicon oxide powder with a median particle size of 4 μm by jet milling. According to silicon oxide powder: polyethylene (PE, Shanghai Bangtao Plastic Raw Materials Factory, molecular weight 3000): paraffin oil (Suzhou Hesen Special Oil Co., Ltd.) = 8:2:1.5 (weight ratio), the silicon oxide powder and Add PE and paraffin oil into the internal mixer, carry out melt blending treatment at 120°C for 15 minutes, and obtain the masterbatch after the end; use the extraction system to extract the pore-forming material in the masterbatch with dichloromethane (Shandong Sanshun Chemical Co., Ltd.). The solvent (that is, paraffin oil) is extracted and separated, and the masterbatch after extraction is heated up to 800°C at 5°C / min under the protection of nitrogen, and after heat treatment for 2 hours, the material is sieved (300 mesh) to finally obtain sili...

Embodiment 3

[0046] The silicon oxide material (purity>99.9%, mass percentage, Beijing Shengbogaotai Optical Technology Co., Ltd.) was crushed into silicon oxide powder with a median particle size of 4 μm by jet milling. According to silicon oxide powder: polypropylene (PP, Suzhou Mingyou Plastic Chemical Co., Ltd., molecular weight 3000): paraffin oil (Suzhou Hesen Special Oil Co., Ltd.) = 8:2:1.5 (weight ratio), the silicon oxide powder Add PP and paraffin oil into the internal mixer, carry out melt blending treatment at 120°C for 15 minutes, and obtain the masterbatch after the end; use the extraction system to extract the components in the masterbatch with dichloromethane (Shandong Sanshun Chemical Co., Ltd.) The porogen (that is, paraffin oil) is extracted and separated, and the masterbatch after extraction is heated up to 800°C at 5°C / min under the protection of nitrogen, and after heat treatment for 2 hours, the material is sieved (300 mesh) to finally obtain silicon carbon composit...

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Abstract

The invention discloses a silicon-carbon negative electrode material, a preparation method thereof, an application thereof and a lithium ion battery prepared therefrom. The preparation method comprises the following steps: melting and blending the raw materials under banburying conditions to obtain a masterbatch, removing the pore-forming agent in the obtained masterbatch, and then heat-treating to obtain a silicon-carbon negative electrode material; the raw materials include a median particle size of 0.5- 10 μm silicon oxide, polyolefin and pore-forming agent; the amount of pore-forming agent added is 0.2-3 times the weight of polyolefin; the carbon content of the silicon-carbon negative electrode material is 1-10 wt%. The surface of the silicon-carbon negative electrode material of the present invention has a porous structure, and the material has good electrolyte wetting properties and a small specific surface area. The lithium-ion battery made of the silicon-carbon negative electrode material of the invention not only has an advantage in capacity, but also has good lithium intercalation rate and low-temperature lithium intercalation performance. The preparation method of the invention has a simple process, simple and easy-to-obtain polyolefin raw materials, and has significant advantages in cost and mass production.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a silicon-carbon negative electrode material, a preparation method, an application thereof, and a prepared lithium-ion battery. Background technique [0002] With the promotion of new energy vehicles, the development of anode materials with high capacity and fast charging ability has significant application value. The existing graphite-based anode materials have limited capacity (theoretical 362mAh / g), and the capacity of the rate-capable graphite-based materials improved by surface coating is lower (340-350mAh / g), so the development of high-capacity, rate-type silicon anode materials It is a feasible way to replace the existing graphite anode materials. [0003] The name of the Chinese invention patent is a preparation method of a silicon-carbon composite negative electrode material and a lithium-ion battery. Publication No. 106257716A introduces ball milling of nano-silico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/364H01M4/38H01M4/386H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 马飞刘海宁沈龙丁晓阳
Owner SHANGHAI SHANSHAN TECH CO LTD
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