Titanium dioxide negative pole piece, preparation method thereof and aqueous lithium ion battery

By electrochemically expanding and fluorinating graphite paper, a three-dimensional conductive network is constructed and a LiF passivation layer is generated, which solves the conductivity and hydrogen evolution problems of aqueous lithium-ion battery anode sheets and improves the rate performance and cycle stability of the battery.

CN121790280APending Publication Date: 2026-04-03CHAOWEI POWER GROUP CO LTD
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Patent Information

Application Number
CN202511976677.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-25
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Traditional aqueous lithium-ion battery anode sheets suffer from low conductivity, easy agglomeration of nanoparticles, and severe hydrogen evolution in aqueous batteries, resulting in poor rate performance and rapid capacity decay during cycles.

Method used

By electrochemically expanding and fluorinating graphite paper, an expanded graphite paper substrate with a three-dimensional conductive network is formed, and a CFX layer with good conductivity is introduced on its surface to construct a dual conductive channel between the bulk phase and the interface. At the same time, a uniform and dense LiF passivation layer is generated during the first charge and discharge of the battery to suppress the hydrogen evolution reaction.

Benefits of technology

It significantly improves the electron conductivity and lithium-ion diffusion rate of the negative electrode, prevents nanoparticle aggregation, enhances rate performance and cycle capacity retention, and achieves excellent electrochemical performance.

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Abstract

The invention relates to a titanium dioxide negative pole piece, a preparation method thereof and an aqueous lithium ion battery, and belongs to the field of electrochemical materials. And at least one of the problems of low conductivity, easy agglomeration of nano-particles, poor rate capability caused by serious hydrogen evolution in an aqueous battery, fast cycle capacity fading and the like of the negative plate in the aqueous lithium ion battery in the prior art is solved. The preparation method of the titanium dioxide negative pole piece comprises the following steps: performing electrochemical expansion treatment on graphite paper to obtain expanded graphite paper; carrying out fluorination treatment on the expanded graphite paper; loading titanium dioxide on the fluorinated expanded graphite paper to obtain an active precursor; and combining the active precursor with a current collector to obtain the titanium dioxide negative pole piece. By improving the conductivity of the negative plate, the phenomena of nanoparticle aggregation and hydrogen evolution are reduced, and the rate capability and the cycle capacity retention ratio of the aqueous lithium ion battery are improved.
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