Affiliation:
1. Institute of New Energy Material Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center (ReCast) School of Materials Science and Engineering Nankai University Tianjin 300350 P. R. China
2. Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE2) School of Chemical Engineering Zhengzhou University Zhengzhou 450001 P. R. China
3. University of Michigan‐Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University 800 Dong Chuan Rd., Minhang District Shanghai 200240 P. R. China
Abstract
AbstractThe practical implementation of garnet‐type solid electrolytes, such as Li6.4La3Zr1.4Ta0.6O12 (LLZTO), faces the significant challenge of Li dendrites. Though artificial interfacial strategies are effective in dendrite suppression, further investigation is needed to understand the mechanism of homogeneous Li deposition and its practicability under real‐world conditions. Herein, a bilayer interface is constructed to address these issues. Such a bilayer interface consists of one conformal Li2O‐rich layer, generated by rubbing LLZTO pellets inside molten Li with low‐dose In2O3, and another Li2O layer deposited through atomic layer deposition (ALD). The regulatory effect of the initial Li2O‐rich layer on achieving uniform Li deposition is explored, and the critical current density is enhanced to 2.4 mA cm−2. However, simple interfacial strategy is insufficient to prevent anodic degradation for cycling at room temperature without stack pressure, leading to increased current leakage and directly reducing Li+ within the electrolyte. After insulating it with a second ALD‐Li2O layer that minimally hampers ionic conduction, the Li/Li symmetric cells achieve long cycling life exceeding 1000 h at 0.5 mA cm−2 and maintain stable operation even at 2 mA cm−2. This work provides valuable insights for interfacial strategies towards practical solid‐state batteries.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials