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Lithium ion battery silicon cathode material and preparation method thereof

A lithium-ion battery, silicon negative electrode technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of cycle stability, electrochemical reversibility, etc., to improve cycle performance, prolong attenuation speed, and alleviate volume effect Effect

Active Publication Date: 2012-10-03
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Application Information

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Problems solved by technology

The cycle stability and electrochemical reversibility of the materials obtained by the sol-gel method are not ideal at present.

Method used

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  • Lithium ion battery silicon cathode material and preparation method thereof
  • Lithium ion battery silicon cathode material and preparation method thereof

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Embodiment Construction

[0022] The technical solutions of the present invention will be described in further non-limiting detail below in conjunction with preferred embodiments and accompanying drawings.

[0023] A lithium-ion battery silicon negative electrode material, which includes nano-silicon powder and a coating layer coated on the surface of the nano-silicon powder, the particle size of the nano-silicon powder is 0.1nm-10μm.

[0024] The cladding layer is silicon dioxide with a layer thickness of 1 nm-1 μm, and the molar ratio of silicon in the silicon negative electrode material of the lithium ion battery is 20-55%. In addition, the above-mentioned covering layer has a sponge network structure with a conductive network in it. The conductive network is graphite and dispersed in the sponge network structure.

[0025] In addition, the present invention also proposes a preparation method of the above-mentioned silicon negative electrode material for lithium ion batteries, which includes the fol...

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Abstract

The invention discloses a lithium ion battery silicon cathode material and a preparation method thereof. The cathode material comprises nanometer silicon powder and a coating layer coated on the surface of the nanometer silicon powder. Grain diameter of the nanometer silicon powder ranges from 0.1 nanometer to 10 micrometers and the coating layer is a layer of silicon dioxide with thickness ranging from 1 nanometer to 1 micrometer. The preparation method for the lithium ion battery silicon cathode material includes: (1) fully dispersing the nanometer silicon powder in sodium silicate solution; (2) adding graphite conducting material and mineral acid into the mixed solution obtained in the step (1) for fully stirring and precipitating; (3) applying the precipitate obtained in the step (2) after being washed on a copper foil surface, and drying the copper foil surface applied with the precipitate at the temperature of 150 DEG C. Active silica in the lithium ion battery silicon cathode material is enabled to exert a larger capacity, and the lithium ion battery silicon cathode material is good in cycle performance simultaneously.

Description

technical field [0001] The invention relates to a lithium ion battery silicon negative electrode material and a preparation method thereof. Background technique [0002] The trend of miniaturization, high energy, and portability of electronic appliances, the development of space technology, the demand for national defense equipment, and the research and development of electric vehicles have higher requirements for the performance of lithium-ion batteries. The improvement of lithium-ion battery performance mainly depends on the improvement of energy density and cycle life of lithium-intercalated electrode materials. At present, the theoretical lithium storage capacity of graphite-based carbon anode materials widely used in lithium-ion batteries is low, which obviously cannot meet the needs of development. Therefore, the development of new high-performance anode materials has become a top priority. [0003] Silicon-based materials are attracting more and more attention becaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M4/1395
CPCY02E60/122Y02E60/10
Inventor 范晔吴晓东
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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