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- Title
In Situ Construction of an Ultra‐Stable Conductive Composite Interface for High‐Voltage All‐Solid‐State Lithium Metal Batteries.
- Authors
Shi, Kai; Wan, Zipei; Yang, Lu; Zhang, Yiwen; Huang, Yanfei; Su, Shiming; Xia, Heyi; Jiang, Keling; Shen, Lu; Hu, Yi; Zhang, Shiqi; Yu, Jing; Ren, Fuzeng; He, Yan‐Bing; Kang, Feiyu
- Abstract
The garnet electrolyte presents poor wettability with Li metal, resulting in an extremely large interfacial impedance and drastic growth of Li dendrites. Herein, a novel ultra‐stable conductive composite interface (CCI) consisting of LiySn alloy and Li3N is constructed in situ between Li6.4La3Zr1.4Ta0.6O12 (LLZTO) pellet and Li metal by a conversion reaction of SnNx with Li metal at 300 °C. The LiySn alloy as a continuous and robust bridge between LLZTO and Li metal can effectively reduce the LLZTO/Li interfacial resistance from 4468.0 Ω to 164.8 Ω. Meanwhile, the Li3N as a fast Li‐ion channel can efficiently transfer Li ions and give their uniform distribution at the LLZTO/Li interface. Therefore, the Li/LLZTO@CCI/Li symmetric battery stably cycles for 1200 h without short circuit, and the all‐solid‐state high‐voltage Li/LLZTO@CCI/LiNi0.5Co0.2Mn0.3O2 battery achieves a specific capacity of 161.4 mAh g−1 at 0.25 C with a capacity retention rate of 92.6 % and coulombic efficiency of 100.0 % after 200 cycles at 25 °C.
- Subjects
SOLID state batteries; LITHIUM cells; INTERFACIAL resistance; SHORT circuits; CONTINUOUS bridges; ALUMINUM-lithium alloys; GARNET
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 29, p11882
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202000547