Synergetic bifunctional Cu-In alloy interface enables Ah-level Zn metal pouch cells

Minghao Zhang, Chenxi Sun, Guanhong Chen, Yuanhong Kang, Zeheng Lv, Jin Yang, Siyang Li, Pengxiang Lin, Rong Tang, Zhipeng Wen, Cheng Chao Li, Jinbao Zhao () and Yang Yang ()
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Minghao Zhang: Xiamen University
Chenxi Sun: Xiamen University
Guanhong Chen: Xiamen University
Yuanhong Kang: Xiamen University
Zeheng Lv: Xiamen University
Jin Yang: Xiamen University
Siyang Li: Xiamen University
Pengxiang Lin: Xiamen University
Rong Tang: Xiamen University
Zhipeng Wen: Guangdong University of Technology
Cheng Chao Li: Guangdong University of Technology
Jinbao Zhao: Xiamen University
Yang Yang: Xiamen University

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Rechargeable aqueous zinc-metal batteries, considered as the possible post-lithium-ion battery technology for large-scale energy storage, face severe challenges such as dendrite growth and hydrogen evolution side reaction (HER) on Zn negative electrode. Herein, a three-dimensional Cu-In alloy interface is developed through a facile potential co-replacement route to realize uniform Zn nucleation and HER anticatalytic effect simultaneously. Both theoretical calculations and experimental results demonstrate that this bifunctional Cu-In alloy interface inherits the merits of low Zn-nucleation overpotential and high HER overpotential from individual copper and indium constituents, respectively. Moreover, the dynamical self-reconstruction during cycling leads to an HER-anticatalytic and zincophilic gradient hierarchical structure, enabling highly reversible Zn chemistry with dendrite-free Zn (002) deposition and inhibited HER. Moreover, the improved interface stability featured by negligible pH fluctuations in the diffusion layer and suppressed by-product formation is evidenced by in-situ scanning probe technology, Raman spectroscopy, and electrochemical gas chromatography. Consequently, the lifespan of the CuIn@Zn symmetric cell is extended to more than one year with a voltage hysteresis of 6 mV. Importantly, the CuIn@Zn negative electrode is also successfully coupled with high-loading iodine positive electrode to fabricate Ah-level (1.1 Ah) laminated pouch cell, which exhibits a capacity retention of 67.9% after 1700 cycles.

Date: 2024
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DOI: 10.1038/s41467-024-53831-z

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