Production of gas-releasing electrolyte-replenishing Ah-scale zinc metal pouch cells with aqueous gel electrolyte

Feifei Wang, Jipeng Zhang, Haotian Lu, Hanbing Zhu, Zihui Chen, Lu Wang, Jinyang Yu, Conghui You, Wenhao Li, Jianwei Song, Zhe Weng, Chunpeng Yang () and Quan-Hong Yang ()
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Feifei Wang: Tianjin University
Jipeng Zhang: Tianjin University
Haotian Lu: Tianjin University
Hanbing Zhu: Tianjin University
Zihui Chen: Tianjin University
Lu Wang: Tianjin University
Jinyang Yu: Tianjin University
Conghui You: International Campus of Tianjin University
Wenhao Li: Xi’an Jiaotong University
Jianwei Song: Xi’an Jiaotong University
Zhe Weng: Tianjin University
Chunpeng Yang: Tianjin University
Quan-Hong Yang: Tianjin University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Aqueous zinc batteries are ideal candidates for grid-scale energy storage because of their safety and low-cost aspects. However, the production of large-format aqueous Zn batteries is hindered by electrolyte consumption, hydrogen gas evolution and accumulation, and Zn dendrites growth. To circumvent these issues, here we propose an “open” pouch cell design for large-format production of aqueous Zn batteries, which can release hydrogen gas and allow the refilling of the electrolyte components consumed during cell cycling. The cell uses a gel electrolyte containing crosslinked kappa (k)-carrageenan and chitosan. It bonds water molecules and hinders their side reaction with Zn, preventing electrolyte leakage and fast evaporation. As a proof-of-concept, we report the assembly and testing of a Zn | |ZnxV2O5·nH2O multi-layer “open” pouch cell using the carrageenan/chitosan gel electrolyte, which delivers an initial discharge capacity of 0.9 Ah and 84% capacity retention after 200 cycles at 200 mA g‒1, 370 kPa and 25 °C.

Date: 2023
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DOI: 10.1038/s41467-023-39877-5

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