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Silicon-carbon anode and preparation method thereof

A silicon carbon and negative electrode technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of easy pulverization, large volume expansion rate of silicon carbon negative electrodes, etc., and achieve enhanced adhesion, enhanced toughness, and excellent conductivity Effect

Active Publication Date: 2019-08-20
桑德新能源技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems existing in the prior art, the present invention provides a silicon-carbon negative electrode and a preparation method thereof, at least partly solving the problem that the existing silicon-carbon negative electrode is easily pulverized due to excessive volume expansion ratio

Method used

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  • Silicon-carbon anode and preparation method thereof

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preparation example Construction

[0089] The preparation method of the silicon carbon negative electrode of the present invention comprises the steps of:

[0090] Dispersing the silicon carbon negative electrode active material, the binder reactant, and the conductive agent in a solvent to prepare a negative electrode slurry, wherein the binder reactant includes polyacrylic acid and sodium carboxymethylcellulose;

[0091] The negative electrode slurry is coated on the current collector, and after baking, a silicon carbon negative electrode is obtained, wherein, during the baking process, polyacrylic acid and sodium carboxymethyl cellulose undergo condensation reaction to form a three-dimensional network polymer.

[0092] In the preparation method of the silicon-carbon negative electrode of the present invention, the baking temperature is 120-200° C., and the baking time is 3-10 minutes.

[0093] The baking temperature is 120-200°C, which can make the polyacrylic acid and sodium carboxymethyl cellulose in the b...

Embodiment 1

[0099] 9.595Kg of graphite powder and silicon oxide powder (graphite powder 7.595Kg, silicon oxide 2Kg), 0.2Kg polyacrylic acid, 0.1Kg sodium carboxymethyl cellulose, 0.005Kg single-walled carbon nanotube (CNT), 0.1Kg Conductive carbon black (SP) was dispersed in deionized water to make a slurry, coated on the surface of copper foil of the negative electrode collector, baked at 150°C to remove the solvent, rolled, and die-cut to obtain a silicon carbon negative electrode.

Embodiment 2

[0101] 9.495Kg of graphite powder and silicon oxide powder (graphite powder 7.095Kg, silicon oxide 2.4Kg), 0.3Kg polyacrylic acid, 0.1Kg sodium carboxymethyl cellulose, 0.005Kg single-walled carbon nanotube (CNT), 0.1 Kg of conductive carbon black (SP) was dispersed in deionized water to make a slurry, coated on the surface of the negative electrode current collector copper foil, baked at 140°C to remove the solvent, rolled, and die-cut to obtain a silicon carbon negative electrode.

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Abstract

The invention relates to a silicon-carbon anode. The silicon-carbon anode comprises a current collector and an anode material layer loaded on the current collector, the anode material layer comprisesa silicon-carbon anode active material, a binder and a conductive agent; the binder comprises a three-dimensional reticular polymer formed by condensation of polyacrylic acid and sodium carboxymethylcellulose. The three-dimensional network structure of the three-dimensional reticular polymer of the binder can bind the bonded silicon-carbon anode active material, can inhibit the expansion of the silicon-carbon anode active material, can increase the structural stability of the anode material layer and can reduce the expansion rate of the silicon-carbon anode active material in the charging anddischarging process. The invention also relates to a preparation method of the silicon-carbon anode, and the silicon-carbon anode capable of reducing the expansion rate is obtained according to the preparation method.

Description

technical field [0001] The invention relates to the technical field of new energy batteries, in particular to a silicon carbon negative electrode and a preparation method thereof. Background technique [0002] Power battery technology is one of the key factors restricting the development of the new energy vehicle industry. Improving the energy density and cycle life of power batteries is an urgent need for the development of new energy vehicles. [0003] The current negative electrode materials of lithium-ion batteries are mostly graphite materials, which have basically given full play to their achievable energy density, and have encountered bottlenecks in improving the energy density of batteries. Therefore, the demand for high energy density has prompted the development of negative electrode materials for lithium-ion batteries from carbon-based materials to silicon-carbon composite materials. [0004] Compared with graphite anode materials, the energy density of silicon-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/133H01M4/1391H01M4/1393
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/622H01M4/628Y02E60/10
Inventor 范欢欢娄忠良
Owner 桑德新能源技术开发有限公司
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