Abstract
All-solid-state batteries are a candidate for next-generation energy-storage devices due to potential improvements in energy density and safety compared to current battery technologies. Due to their high ionic conductivity and potential scalability through slurry processing routes, sulfide solid-state electrolytes are promising to replace traditional liquid electrolytes and enable All-solid-state batteries, but stability of cathode-sulfide solid-state electrolytes interfaces requires further improvement. Herein we review common issues encountered at cathode-sulfide SE interfaces and strategies to alleviate these issues.
Highlights
Improvements in energy density, performance, and safety of battery technology are key to meeting international climate goals within the transportation and energy generation sectors (Deng et al, 2020)
The challenges associated with these materials include interdiffusion of transition metal ions, heterogeneous Li+ distribution near the interface in the SCL, and microstructural evolution of the cathode and/or sulfide SE during cycling
A proper understanding of the failure mechanisms during cycling due to cathode/SE interfacial instability should provide guidance for the development of protective coating layers, novel dopants, and other treatments to further improve the performance of SSBs with sulfide-based SEs
Summary
Improvements in energy density, performance, and safety of battery technology are key to meeting international climate goals within the transportation and energy generation sectors (Deng et al, 2020). Research focus has shifted from liquid to solid-state electrolytes (SSEs) to achieve these goals (Wang et al, 2015) Due to their high ionic conductivity and good processability, sulfide electrolytes are a very promising SSE for all-solid-state batteries (ASSBs) (Dudney et al, 2015). Chemical stability is the electrolytes’ ability to withstand chemical contact with electrode materials, whereas the electrochemical stability window defines the voltage range where the SSE is neither oxidized nor reduced during ASSB operation. It is possible for sulfide based ASSBs to achieve high energy density and long cycle life even if the interface isn’t thermodynamically stable, if the instability results in the formation of a kinetically stable passive film
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