Spherical silicon carbon composite anode material of lithium ion battery and preparation method for spherical silicon carbon composite anode material

A technology for lithium-ion batteries and negative electrode materials, applied to battery electrodes, circuits, electrical components, etc., can solve the problems that cannot completely solve the problem of silicon powder exposure, and it is difficult to fully utilize the buffer mechanism of graphite, so as to reduce the probability of dispersion and exposure. The effect of good cycle performance and complete configuration rules
CN102709566AInactive Publication Date: 2012-10-03力芯(青岛)新能源材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
力芯(青岛)新能源材料有限公司
Publication Date
2012-10-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a spherical silicon carbon composite anode material of a lithium ion battery and a preparation method for the spherical silicon carbon composite anode material. The spherical silicon carbon composite anode material comprises 5 to 12 percent of silicon, 68 to 90 percent of graphite and the balance of carbon material. A spherical precursor is prepared from silicon powder, flake graphite and the carbon source material by a constant-temperature mixing technology; and the spherical silicon carbon composite anode material is prepared by balling high-temperature thermal treatment, wherein the core of spherical silicon carbon composite anode material is anisotropically distributed and the surface of the flake / carbon is wrapped by the carbon material. In the spherical silicon carbon composite anode material, the reversible capacity can reach more than 480 Ah / g; the sequential efficiency at the first time can reach over 85 percent; and the capacity retention rate after circulation is performed for 300 times is more than 87 percent.
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Description

[0001] Technical field

[0002] The invention relates to a lithium ion battery silicon-carbon composite negative electrode material and a preparation method thereof, in particular to a lithium ion battery spherical silicon-carbon composite negative electrode material and a preparation method thereof.

[0003] technical background

[0004] Lithium-ion batteries are currently the most widely used power equipment for providing energy for portable and powered vehicles, and graphite materials are the main negative electrode materials. However, in the process of commercial application, people’s requirements for high-energy power sources are getting higher and higher. In order to overcome the shortcomings of the limited lithium insertion capacity (372 mAh / g) of graphite materials, and to find better performance anode materials, people are looking for a variety of new Anode materials have been studied. Among them, Si-based anode materials have attracted the attention of researchers because...

Claims

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