Galvanostatic cycling of a micron-sized solid-state battery: Visually linking void evolution to electrochemistry.

Authors

Haowen Gao, Chen Lin, Yuanpeng Liu, Jiashun Shi, Bowen Zhang, Zhefei Sun, Zhao Li, Yu Wang, Menghao Yang, Yong Cheng, Ming-Sheng Wang

Published in

Science advances. Volume 11. Issue 14. Pages eadt4666. Apr 04, 2025. Epub Apr 04, 2025.

Abstract

The formation of interface voids, peculiar to the solid-solid contact between metal anodes and solid electrolytes (SEs), has become a fundamental obstacle for developing practical lithium metal solid-state batteries (SSBs). Addressing this issue requires the operando observation of void evolution with high spatio-temporal resolution and the direct linkage of voids to solid-state electrochemistry. Here, we present such an attempt by visualizing both the stripping and plating interfaces of a micron-sized SSB cycled in galvanostatic mode in a transmission electron microscope. Various voltage responses in the charge/discharge curves are well correlated to the nucleation, growth, and refilling of single voids. Notably, two distinct modes of Li stripping, namely, void-growth stripping and void-free stripping, are experimentally identified. We unveil the roles of stack pressure and current density on void evolutions, which suggests a mechanism of void suppression without involving plastic deformation of Li metal. Furthermore, Li|SE|Li symmetric SSBs enabling repeated void-free cycling without stack pressure are in situ demonstrated.

PMID:
40184446
Bibliographic data and abstract were imported from PubMed on 05 Apr 2025.

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