Preparation method of modified zinc-bromine flow battery carbon felt negative electrode and carbon felt negative electrode prepared by method

By loading copper particles onto the carbon felt negative electrode of the zinc-bromine flow battery, the problems of conductivity and metal active site failure in the carbon felt electrode were solved, achieving high-efficiency electrochemical performance and long lifespan of the zinc-bromine flow battery.

CN121260818AActive Publication Date: 2026-01-02SHANDONG HAIHUA GRP CO LTD +1
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Patent Information

Application Number
CN202511811554.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-04
Publication Date
2026-01-02
Estimated Expiration
2045-12-04

AI Technical Summary

Technical Problem

In existing zinc-bromine flow batteries, the oxide conductivity of the carbon felt electrode is low, which affects electron transfer during zinc deposition/stripping. The loaded metal active sites react with the electrolyte and fail, and the solid-liquid interfacial tension between the metal salt solution and the carbon felt leads to uneven loading.

Method used

Copper particles were loaded onto a carbon felt anode using a vapor deposition process. The copper organic precursor was converted into elemental copper under a high-temperature hydrogen atmosphere. Taking advantage of copper's good conductivity and zinc affinity, a uniform zinc deposition layer was formed, which suppressed zinc dendrite growth.

Benefits of technology

It significantly improved the electrochemical performance and cycle stability of zinc-bromine flow batteries, maintaining coulombic efficiency and energy efficiency at 95.7% and 94.5%, respectively, and suppressed the growth of zinc dendrites.

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Abstract

The invention discloses a preparation method of a modified zinc-bromine flow battery carbon felt negative electrode and the carbon felt negative electrode prepared by the method, and belongs to the field of zinc-bromine flow batteries. A copper organic matter precursor is heated and gasified in a double-temperature-zone tubular furnace, molecules of the partially gasified copper organic matter precursor are loaded to the position where a carbon felt is located by hydrogen and adsorbed on the carbon felt, the copper organic matter precursor reacts with the hydrogen to form a copper elementary substance, and the copper elementary substance is attached to the surface of the carbon felt to form a load. Therefore, the purpose of modifying the carbon felt by loading the copper elementary substance is achieved. According to the method, the obstruction of low conductivity of the loaded oxide on electron transfer in the zinc deposition / stripping process is overcome; inactivation caused by reaction of loaded metal active sites and electrolyte acidic components is avoided; and the problem that the internal fibers of the carbon felt are difficult to uniformly load metal elementary substances or oxide particles due to high surface tension between the metal salt solution and the carbon felt is solved, efficient and uniform loading of the copper elementary substances on the carbon felt is realized, and the negative electrode performance of the zinc-bromine flow battery is remarkably improved.
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