A double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof

A technology of lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of high platform voltage and low specific capacity, and improve conductivity and volume Effects of reduced swelling and excellent long-cycle performance
CN109119618AInactive Publication Date: 2019-01-01MAANSHAN KEDA PURUI ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MAANSHAN KEDA PURUI ENERGY TECH CO LTD
Publication Date
2019-01-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a double-layer coated core-shell negative electrode material for lithium ion battery and a preparation method thereof. A CVD deposition method is used for depositing nano silicon on that graphite particle to obtain a precursor of a negative electrode material; The titanium dioxide, the lithium carbonate and the organic pyrolysis carbon source are dispersed in an organic solvent to prepare a gel; the precursor of anode material was added into the gel, and the core-shell structure anode material was prepared by low temperature treatment, homogeneous dispersion and high temperature reaction. The core of double-layer coated core-shell negative electrode material for the lithium ion battery is nano silicon and graphite, the nano silicon is deposited on the surface of graphite particles, the outer shell is an organic pyrolytic carbon layer, and the inner shell is formed by attaching lithium titanate to the inner wall of the organic pyrolytic carbon layer. The core-shell negative electrode material has high capacity, high rate and excellent cycling performance, and the preparation process is simple, green and pollution-free, suitable for large-scale production.
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Description

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a double-layer coated core-shell negative electrode material for lithium ion batteries and a preparation method thereof. Background technique

[0002] In the context of environmental pollution and energy shortage, lithium-ion batteries are currently the main power source for new energy vehicles because of their clean, pollution-free, high-efficiency and recyclable characteristics. Electrode materials in lithium-ion batteries have a decisive impact on battery performance, and anode materials play a vital role in improving the performance of lithium-ion batteries.

[0003] Silicon has an ultra-high theoretical specific capacity (4200mAh / g) and a low delithiation potential (<0.5V), and the voltage platform of silicon is slightly higher than that of graphite, which is difficult to cause lithium precipitation on the surface during charging, and has better safety perfo...

Claims

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