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

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number234394
JournalJournal of Power Sources
Volume602
DOIs
Publication statusPublished - 2024 May 15

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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