Symposium X—Frontiers of Materials Research
Symposium SF10—Emerging Functional Materials and Interfaces

Symposium EN05—Emerging Materials for Electrochemical Energy Storage Devices—Degradation and Failure Characterization—From Composition, Structure and Interfaces to Deployed Systems

Linda Nazar, University of Waterloo

Design and Understanding of Cathode-Solid Electrolyte Interfaces for High Voltage Stability in All-Solid-State Batteries

Written by Mohit Saraf

Linda Nazar talked about all-solid-state batteries (ASSBs), which offer many advantages over other systems but have many associated challenges. While liquid electrolytes raise safety concerns and limited by a narrow voltage (4.3 V), solid electrolytes (SEs) demonstrate improved safety, enhanced energy density (by a factor of 2-3) and can be operated over a wide operational range. She also pointed out that dual solid electrolytes are likely necessary for all-solid-state batteries and discussed her recent works where a new class of SEs with high ionic conductivity and very low electronic conductivity was explored. The work showed that owing to the excellent interfacial stability of the SEs against un-coated high-voltage cathode materials, ASSBs utilizing LiNi0.85Co0.1Mn0.05O2 exhibit superior rate capability and long-term cycling (up to 4.8 V vs Li+/Li) compared to state-of-the-art ASSBs. Nazar gave many other examples of her recent work where her group obtained promising results. These results pave the pathway for designing SEs with a low electronic/ionic conductivity ratio. She also stressed upon establishing a framework to study the halide SEs and electrochemical stability of SEs. She concluded her talk by mentioning that new solid halide electrolytes enable “bare” high-voltage cathode materials for batteries.

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