Grain boundary complexion modification for interface stability in garnet based solid-state Li batteries

Chih Chieh Wang, Wei Chun Hsu, Chia Yu Chang, Martin Ihrig, Ngoc Thanh Thuy Tran, Shih kang Lin, Anna Windmüller, Chih Long Tsai, Rüdiger A. Eichel, Kuo Feng Chiu

研究成果: Article同行評審

摘要

The garnet type solid-state electrolyte (SSE) encounters challenges related to poor interfacial contact with Li metal and dendrite penetration problem. This study addresses these issues by manipulating the surface property of garnet-based LLZTO (Li6.5La3Zr1.6Ta0.4O12) SSE. The manipulation is achieved by varying thickness of Al2O3 atomic layer deposition (ALD), followed by sintering. Research results show that the relative density, ionic conductivity, and hardness of LLZTO are improved while electronic conductivity is reduced due to the formation of multiple complexions at grain boundary (GB). The SSE pellets also demonstrate improved wettability with Li metal, leading to stable galvanostatic Li plating/stripping cycling with low polarization, which allows for batter battery performance than pristine one. The concept of modifying SSE through the grain boundary complexion modification by thin ALD coating for enhancing the dendrite tolerance with better electrochemical properties of SSE may open a new direction for solid state battery research.

原文English
文章編號234394
期刊Journal of Power Sources
602
DOIs
出版狀態Published - 2024 5月 15

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 能源工程與電力技術
  • 物理與理論化學
  • 電氣與電子工程

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