A kind of preparation method of silicon negative electrode material containing surface modification film

A technology of surface modification and silicon negative electrode, which is applied in the field of preparation of silicon negative electrode materials, can solve the problems of unstable cycle performance of high specific energy silicon carbon negative electrodes, unsuitable binders, etc., to improve long-term cycle stability and simplify the preparation method Convenience and the effect of improving cycle stability
CN110137485BActive Publication Date: 2021-02-09ZHUHAI COSMX BATTERY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHUHAI COSMX BATTERY CO LTD
Publication Date
2021-02-09

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Abstract

The invention discloses a method for preparing a silicon negative electrode material containing a surface modification film, which belongs to the technical field of lithium ion batteries. The method is as follows: dissolving the polymer into water, adding silicon material, stirring while heating, removing moisture in the solution, and obtaining silicon material coated with polymer film A; dissolving PAN in NMP solvent, stirring to make it Completely dissolve, add the silicon material coated with the polymer film A and the conductive agent into the PAN solution, stir while heating, remove the NMP solvent in the solution, and obtain a silicon negative electrode material containing a surface modification film. The artificially modified film of the silicon negative electrode invented can satisfy the use of ordinary SBR binders in the silicon carbon negative electrode, so that graphite and silicon negative electrodes can each generate their own SEI film without mutual influence, further improving the cycle stability of the battery . The preparation method of the silicon negative electrode artificially modified membrane described in the present invention is simple and convenient, and can meet the requirements of the conventional water system batching method for the silicon carbon negative electrode.
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Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a silicon negative electrode material containing a surface modification film. Background technique

[0002] Due to the advantages of high energy density, long cycle life and environmental friendliness of lithium-ion batteries, they are widely used in portable electronic products such as mobile phones and notebook computers and new energy vehicles. The density has reached the bottleneck, and the energy density is difficult to break through.

[0003] In order to obtain lithium-ion batteries with higher energy density, nano-silicon, silicon oxide and silicon carbon have entered the world of lithium-ion batteries. However, the problems of swelling and pulverization of silicon negative electrodes and poor cycle performance cannot be fundamentally solved. Therefore, Nano-silicon, silicon carbon or a mixture of silicon oxide and graphite...

Claims

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