A multilayer composite bipolar plate derived from a carbon grid for vanadium battery and a preparation method thereof

By adopting etching treatment and multi-layer conductive support layer modification technology in composite bipolar plates, the problem of difficult to take into account both the conductivity and mechanical strength of composite bipolar plates is solved, and the performance of all vanadium flow batteries is improved.

CN119230862BActive Publication Date: 2025-03-25HANGZHOU DEHAI AIKE ENERGY TECH CO LTD
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Patent Information

Application Number
CN202411756856.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-03
Publication Date
2025-03-25
Estimated Expiration
2044-12-03

AI Technical Summary

Technical Problem

The existing composite bipolar plates are difficult to take into account both the improvement of conductivity and mechanical strength, resulting in limited performance of all vanadium flow batteries.

Method used

The carbon fiber material is used as the substrate, and the surface roughness is improved through etching treatment, combined with the multi-layer conductive support layer modification technology, the bonding strength between the carbon fiber material and the conductive filler is enhanced, and a multi-layer composite bipolar plate derived from a carbon grid is formed through hot pressing treatment.

Benefits of technology

The double improvement of the conductivity and mechanical strength of the composite bipolar plate is achieved, and the efficiency and durability of the vanadium battery are improved.

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Abstract

The present invention relates to the technical field of all-vanadium liquid flow batteries, and discloses a multi-layer composite bipolar plate derived from a carbon grid for vanadium batteries and a preparation method thereof, comprising the following steps: treating a carbon fiber material with an etching solution to obtain an etched carbon fiber, brushing a mixed slurry 1 configured with a conductive filler, a binder, etc. onto its surface to obtain a preliminary modified carbon fiber, then brushing a mixed slurry 2 configured with oxide nanoparticles, a conductive polymer, etc. onto both sides of the preliminary modified carbon fiber and drying, repeating the above brushing and drying steps twice to obtain a multi-layer conductive support layer modified carbon fiber, attaching graphite paper to the obtained carbon fiber and then hot pressing to obtain a multi-layer composite bipolar plate derived from a carbon conductive grid. The multi-layer composite bipolar plate prepared by the present invention uses the etched carbon fiber as a substrate, and provides beneficial mechanical strength and a conductive grid through the stacking of multiple conductive coatings, effectively improving the stability and conductivity of the bipolar plate, thereby improving the efficiency of the vanadium battery.
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