Hierarchical Li electrochemistry using alloy-type anode for high-energy-density Li metal batteries

Jiaqi Cao, Yuansheng Shi, Aosong Gao, Guangyuan Du, Muhtar Dilxat, Yongfei Zhang, Mohang Cai, Guoyu Qian, Xueyi Lu, Fangyan Xie, Yang Sun and Xia Lu ()
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Jiaqi Cao: Sun Yat-sen University
Yuansheng Shi: Sun Yat-sen University
Aosong Gao: Sun Yat-sen University
Guangyuan Du: Sun Yat-sen University
Muhtar Dilxat: Sun Yat-sen University
Yongfei Zhang: Sun Yat-sen University
Mohang Cai: Sun Yat-sen University
Guoyu Qian: Sun Yat-sen University
Xueyi Lu: Sun Yat-sen University
Fangyan Xie: Sun Yat-sen University
Yang Sun: Sun Yat-sen University
Xia Lu: Sun Yat-sen University

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Exploiting thin Li metal anode is essential for high-energy-density battery, but is severely plagued by the poor processability of Li, as well as the uncontrollable Li plating/stripping behaviors and Li/electrolyte interface. Herein, a thickness/capacity-adjustable thin alloy-type Li/LiZn@Cu anode is fabricated for high-energy-density Li metal batteries. The as-formed lithophilic LiZn alloy in Li/LiZn@Cu anode can effectively regulate Li plating/stripping and stabilize the Li/electrolyte interface to deliver the hierarchical Li electrochemistry. Upon charging, the Li/LiZn@Cu anode firstly acts as Li source for homogeneous Li extraction. At the end of charging, the de-alloy of LiZn nanostructures further supplements the Li extraction, actually playing the Li compensation role in battery cycling. While upon discharging, the LiZn alloy forms just at the beginning, thereby regulating the following Li homogeneous deposition. The reversibility of such an interesting process is undoubtedly verified from the electrochemistry and in-situ XRD characterization. This work sheds light on the facile fabrication of practical Li metal anodes and useful Li compensation materials for high-energy-density Li metal batteries.

Date: 2024
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DOI: 10.1038/s41467-024-45613-4

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