Silicon/carbon composite anode material for lithium ion batteries and preparation method thereof

A negative electrode material and carbon composite technology, applied in the direction of battery electrodes, batteries, negative electrodes, etc., can solve the problems of restricting battery cycle performance and rate performance, shortening lithium ion transmission distance, mechanical pulverization, etc., and achieve good lithium ion transmission performance , Ensure electrochemical stability, reduce the possible effect of agglomeration
CN104752691AActive Publication Date: 2015-07-01GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
Publication Date
2015-07-01

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Abstract

The invention relates to a silicon / carbon composite anode material for lithium ion batteries and a preparation method thereof. The material is composed of a graphite framework material, a middle buffer layer SiOC material, carbon fiber and a silicon-containing material with the carbon-coated surface, wherein the silicon-containing material with the carbon-coated surface is combined with the graphite framework material through the buffer layer SiOC and carbon fiber. Stoichiometric equation of the composite anode material is aSiOz@dAC-bSiOxCy&cCF-C, wherein a is less than or equal to 0.2 and greater than 0; b is less than or equal to 0.4 and greater than 0; c is less than or equal to 0.1 and greater than 0; d is less than or equal to 0.1 and greater than 0; z is less than or equal to 2 and greater than or equal to 0; x is less than 4 and greater than 0; and y is less than or equal to 20 and greater than 0. In the composite material, the amorphous carbon-coated silicon material is effectively contacted with graphite under the action of SiOC and carbon fiber so as to avoid agglomeration of the silicon material itself and peeling of graphite. According to the invention, charge-discharge specific capacity is adjustable, and electrochemical cyclic stability is high.
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Description

technical field

[0001] The invention relates to a silicon / carbon composite negative electrode material for lithium ion batteries and a preparation method thereof, in particular to a highly dispersed silicon / carbon composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique

[0002] Due to its performance advantages, lithium-ion batteries have been used in various mobile energy storage, such as laptops, mobile phones and cameras. With the development of lithium-ion batteries, lithium-ion batteries with high specific energy, long life and low cost that can be applied to electric vehicles and large-scale energy storage power stations will become the focus of research. At present, the development and progress of cathode materials, one of the main factors determining battery performance, has laid the foundation for the research and development of high-performance lithium-ion batteries; however, graphite-based commercial a...

Claims

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