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Silicon-carbon composite cathode pole piece of lithium ion battery and preparation method of silicon-carbon composite cathode pole piece

A lithium-ion battery, silicon-carbon composite technology, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of high battery impedance, short cycle life, and inability to improve the conductivity of silicon-based materials, etc., to achieve cycle life long, improve electrical conductivity, and improve the effect of market application prospects

Inactive Publication Date: 2016-05-11
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technical personnel's research on silicon-based materials is mainly focused on suppressing the expansion of the negative electrode sheet, and the electrical conductivity of silicon-based materials cannot be improved. The batteries prepared from silicon-based materials still have the problems of high impedance and short cycle life.

Method used

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  • Silicon-carbon composite cathode pole piece of lithium ion battery and preparation method of silicon-carbon composite cathode pole piece
  • Silicon-carbon composite cathode pole piece of lithium ion battery and preparation method of silicon-carbon composite cathode pole piece
  • Silicon-carbon composite cathode pole piece of lithium ion battery and preparation method of silicon-carbon composite cathode pole piece

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preparation example Construction

[0050] In addition, the present invention also provides a method for preparing a silicon-carbon composite negative electrode sheet of a lithium-ion battery, which is used to produce the above-mentioned silicon-carbon composite negative electrode sheet provided by the present invention. The method specifically includes the following steps:

[0051] The first step is to configure carboxymethyl cellulose CMC glue: add carboxymethyl cellulose CMC powder to deionized water, adjust the solid content of the glue solution to 0.1% to 10%, and then stir evenly to obtain CMC glue;

[0052] In the first step, preferably: stirring at a stirring speed of 100 rpm to 800 rpm for 4h to 24h.

[0053] In the first step, on specific realization, the condition that the ratio between the carboxymethyl cellulose CMC powder and the deionized water should meet is: the quality between the carboxymethyl cellulose CMC powder and the deionized water The ratio is 1:(10~1000).

[0054] The second step is t...

specific Embodiment 1

[0073] In specific embodiment 1, the present invention makes highly conductive lithium-ion battery silicon-carbon composite negative pole sheet, comprising the following steps:

[0074] The first step is to configure carboxymethylcellulose CMC glue: add 30g of CMC powder into deionized water, adjust the solid content of the glue solution to 1.6%, stir at a slow speed of 500rpm for 12h, and stir evenly to obtain CMC glue;

[0075] The second step is to configure conductive glue: add 80g graphene conductive agent, 185g carbon nanotube conductive agent, and 10g SuperP conductive agent to the CMC glue, and stir rapidly at a speed of 3000rpm for 1 hour to obtain conductive glue;

[0076] The third step is to add silicon carbon material: add 2.3kg of artificial graphite and 0.2kg of silicon oxide to the conductive adhesive obtained in the second step at the same time, stir at a slow speed of 500rpm for 30min, and then quickly at a speed of 2000rpm Stir for 4 hours, add deionized wat...

specific Embodiment 2

[0086] In specific embodiment 2, the present invention makes highly conductive lithium-ion battery silicon-carbon composite negative pole sheet, comprising the following steps:

[0087]The first step is to configure carboxymethylcellulose CMC glue: add 30g of CMC powder into deionized water, adjust the solid content of the glue solution to 1.2%, stir at a slow speed of 400rpm for 12h, and stir evenly to obtain CMC glue;

[0088] The second step is to configure conductive adhesive: add 160g graphene conductive agent, 100g carbon nanotube conductive agent, and 10g SuperP conductive agent to the CMC adhesive, and stir rapidly at a speed of 3000rpm for 1 hour to obtain conductive adhesive;

[0089] The third step is to add silicon carbon materials: add 2.3kg of artificial graphite and 0.2kg of silicon oxide to the conductive adhesive obtained in the second step, stir at a slow speed of 600rpm for 30min, and then quickly at a speed of 2000rpm Stir for 4 hours, add deionized water t...

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Abstract

The invention discloses a silicon-carbon composite cathode pole piece of a lithium ion battery. The silicon-carbon composite cathode pole piece comprises a cathode current collector, wherein one silicon-carbon cathode active material layer coats the surface of the cathode current collector; the silicon-carbon cathode active material layer is prepared from the following components by mass percent: 80%-99.5% of a silicon-carbon composite material, 0%-15% of a graphene conductive agent, 0%-15% of a carbon nano tube conductive agent, 0%-15% of a carbon black conductive agent and 0.2%-20% of a binding agent. Furthermore, the invention discloses a preparation method of the silicon-carbon composite cathode pole piece. According to the silicon-carbon composite cathode pole piece and the preparation method of the silicon-carbon composite cathode pole piece, disclosed by the invention, the silicon-carbon composite cathode pole piece can be used for effectively improving the conductive property of a silicon-based material and guaranteeing low impedance and long cycle life of the lithium ion battery applied by the cathode pole piece; the whole properties of the lithium ion battery are greatly improved, and long-time use requirements of electronic products can be met; and a market application prospect of products of battery manufacturers can be improved easily.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a silicon-carbon composite negative pole piece of a lithium-ion battery and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries are internationally recognized as ideal chemical power sources. They have many advantages such as high voltage, high energy density, long cycle life, small self-discharge, no memory effect, wide operating temperature range, and no pollution. They are widely used in mobile Telephones, laptop computers, portable power tools, weaponry, etc. [0003] With the development of green energy technology and low-carbon economy, the commercialization of lithium-ion batteries has attracted more and more attention from all over the world. In recent years, with the rapid progress of electric vehicles and consumer electronics, there is an urgent need for high-energy-density lithium-ion batteries with longer battery life. [...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/139H01M4/36H01M4/38H01M4/583H01M4/62H01M4/66H01M10/0525
CPCH01M4/02H01M4/139H01M4/364H01M4/386H01M4/583H01M4/621H01M4/625H01M4/661H01M10/0525Y02E60/10
Inventor 赵家兴孔令丽张克军孙杰
Owner TIANJIN LISHEN BATTERY
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