Silicon-carbon composite negative electrode material and preparation method and application thereof

A composite material and in-situ composite technology, applied in the direction of nanotechnology, silicon compounds, chemical instruments and methods for materials and surface science, to achieve high thermal and chemical stability, improve binding force, and solve the effect of agglomeration
CN112028066AActive Publication Date: 2020-12-04湖南宸宇富基新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
湖南宸宇富基新能源科技有限公司
Publication Date
2020-12-04

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Abstract

The invention discloses a silicon-carbon composite negative electrode material and a preparation method and application thereof. The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly discloses a nitrogen-rich graphite nanosheet / nano-silicon composite material which comprises a nitrogen-rich graphite nanosheet with a two-dimensional structure and nano-silicon particles uniformly compounded on the surface of the nitrogen-rich graphite nanosheet in situ. Besides, the invention further provides preparation of the material, a CN source isused as a precursor, two-stage treatment is performed in an oxygen-containing atmosphere, then silicon is loaded and mixed with a metal reducing agent and compound salt, and two-stage gradient reduction is performed in an inert atmosphere. Research finds that the structural stability can be effectively improved and the electrochemical performance of the material can be improved due to the synergistic effect between the components and the morphological characteristics of the material.
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Description

technical field

[0001] The invention belongs to the technical field of lithium battery electrode materials, and particularly relates to a silicon-carbon composite negative electrode material and a preparation method thereof. Background technique

[0002] With high energy density, long cycle life, low self-discharge and no memory effect, lithium-ion batteries have replaced traditional batteries and dominated the consumer electronics and electric vehicle industries. At present, graphite is generally used as the negative electrode material for commercial lithium-ion batteries, but its theoretical lithium storage capacity is low, and lithium precipitation is prone to occur during high-current charging and discharging, which cannot meet the needs of the development of high-performance lithium-ion batteries. As a research hotspot of new anode materials in recent years, silicon is considered to be the most promising anode material for lithium-ion batteries due to its advantages of ...

Claims

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