Interface-Engineered Li&lt;sub&gt;7&lt;/sub&gt;La&lt;sub&gt;3&lt;/sub&gt;Zr&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;12&lt;/sub&gt;-Based Garnet Solid Electrolytes with Suppressed Li-Dendrite Formation and Enhanced Electrochemical Performance

Zhang, Zhaoshuai; Zhang, Long; Liu, Yanyan; Wang, Hongqiang; Yu, C.; Zeng, Hong; Wang, L.; Xu, B.

doi:10.1002/cssc.201801756

Interface-Engineered Li₇La₃Zr₂O₁₂-Based Garnet Solid Electrolytes with Suppressed Li-Dendrite Formation and Enhanced Electrochemical Performance

Title

Interface-Engineered Li₇La₃Zr₂O₁₂-Based Garnet Solid Electrolytes with Suppressed Li-Dendrite Formation and Enhanced Electrochemical Performance

Author

Zhang, Zhaoshuai (Yanshan University)
Zhang, Long (Yanshan University)
Liu, Yanyan (Yanshan University)
Wang, Hongqiang (Hebei University)
Yu, C. (TU Delft RST/Storage of Electrochemical Energy)
Zeng, Hong (China Iron & Steel Research Institute Group)
Wang, L. (Yanshan University)
Xu, B. (Yanshan University)

Date

2018

Abstract

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_0.8Co_0.1Mn_0.1O₂/Li and LiFePO₄/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.

Subject

batteries
garnet
interfaces
ionic liquids
solid electrolytes

To reference this document use:

http://resolver.tudelft.nl/uuid:a18674ca-abc2-4114-985b-26fa324249bb

DOI

https://doi.org/10.1002/cssc.201801756

Embargo date

2019-09-07

ISSN

1864-5631

Source

ChemSusChem (Print): chemistry & sustainability, energy & materials, 11