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Interface‐Engineered Li 7 La 3 Zr 2 O 12 ‐Based Garnet Solid Electrolytes with Suppressed Li‐Dendrite Formation and Enhanced Electrochemical Performance
Author(s) -
Zhang Zhaoshuai,
Zhang Long,
Liu Yanyan,
Wang Hongqiang,
Yu Chuang,
Zeng Hong,
Wang Limin,
Xu Bo
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201801756
Subject(s) - electrolyte , materials science , electrochemistry , electrochemical window , fast ion conductor , wetting , ionic conductivity , chemical engineering , oxide , ionic liquid , dendrite (mathematics) , microstructure , electrode , composite material , metallurgy , chemistry , biochemistry , geometry , mathematics , engineering , catalysis
High grain‐boundary resistance, Li‐dendrite formation, and electrode/Li interfacial resistance are three major issues facing garnet‐based solid electrolytes. Herein, interfacial architecture engineering by incorporating 1‐butyl‐1‐methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMP‐TFSI) ionic liquid into a garnet oxide is proposed. The “soft” continuous BMP‐TFSI coating with no added Li salt generates a conducting network facilitating Li + transport and thus changes the ion conduction mode from point contacts to face contacts. The compacted microstructure suppresses Li‐dendrite growth and shows good interfacial compatibility and interfacial wettability toward Li metal. Along with a broad electrochemical window larger than 5.5 V and an Li + transference number that practically reaches unity, LiNi 0.8 Co 0.1 Mn 0.1 O 2 /Li and LiFePO 4 /Li solid‐state batteries with the hybrid solid electrolyte exhibit superior cycling stability and low polarization, comparable to those with commercial liquid electrolytes, and excellent rate capability that is better than those of Li‐salt‐based ionic‐liquid electrolytes.