Journal
SCIENCE BULLETIN
Volume 67, Issue 9, Pages 946-954Publisher
ELSEVIER
DOI: 10.1016/j.scib.2022.01.026
Keywords
Ceramic-liquid hybrid electrolyte; Ceramic electrolyte; Liquid electrolyte; Li -ion exchange; Li -ion transfer pathway
Categories
Funding
- National Natural Science Foundation of China [U2001220]
- Key-Area Research and Development Program of Guangdong Province [2020B090919001]
- Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center [XMHT20200203006]
- Shenzhen Technical Plan Project [RCJC20200714114436091, JCYJ20180508152210821, JCYJ20180508152135822]
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Ceramic electrolytes play a crucial role in solid-liquid batteries by solving interfacial issues and enabling efficient Li-ion transfer. This study confirms the Li-ion transport mechanism in ceramic electrolytes through solid-state nuclear magnetic resonance spectroscopy. The ceramic and liquid electrolytes both contribute to Li-ion transport and exhibit spontaneous Li-ion exchange, improving the continuity of Li-ion pathways.
Ceramic electrolytes are important in ceramic-liquid hybrid electrolytes (CLHEs), which can effectively solve the interfacial issues between the electrolyte and electrodes in solid-state batteries and provide a highly efficient Li-ion transfer for solid-liquid Li metal batteries. Understanding the ionic transport mechanisms in CLHEs and the corresponding role of ceramic electrolytes is crucial for a rational design strategy. Herein, the Li-ion transfer in the ceramic electrolytes of CLHEs was confirmed by tracking the 6Li and 7Li substitution behavior through solid-state nuclear magnetic resonance spectroscopy. The ceramic and liquid electrolytes simultaneously participate in Li-ion transport to achieve highly efficient Li-ion transfer in CLHEs. A spontaneous Li-ion exchange was also observed between ceramic and liquid electrolytes, which serves as a bridge that connects the ceramic and liquid electrolytes, thereby greatly strengthening the continuity of Li-ion pathways in CLHEs and improving the kinetics of Li-ion transfer. The importance of an abundant solid-liquid interface for CLHEs was further verified by the enhanced electrochemical performance in LiFePO4/Li and LiNi0.8Co0.1Mn0.1O2/Li batteries from the generated interface. This work provides a clear understanding of the Li-ion transport pathway in CLHEs that serves as a basis to build a universal Li-ion transport model of CLHEs. (c) 2022 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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