ImprovedInterface Stability and Room-TemperaturePerformance of Solid-State Lithium Batteries by Integrating Cathode/Electrolyteand Graphite Coating
2020
Poor
interface stability is a crucial problem hindering the electrochemical
performance of solid-state lithium batteries. In this work, a novel
approach for interface stability was proposed to integrate the cathode/solid
electrolyte by forming an electrolyte buffer layer on the rough surface
of the cathode and coating a layer of graphite on the side of the
electrolyte facing the lithium anode. This hybrid structure significantly
improves the integration and the interface stability of the electrode/electrolyte.
The interfacial resistance was dramatically reduced, the stability
of the plating/stripping of Li metal was enhanced, and the growth
of lithium dendrites was also inhibited due to the formation of the
LiC6 transition layer. The obtained solid-state lithium
battery shows enhanced rate performance at room temperature from 0.5
to 4 C and stable cycling performance at 1 C with a retention capacity
of 100 mAh g–1 after 200 cycles. This integrated
electrode/electrolyte design approach is expected to be widely used
to improve interfacial stability and room-temperature electrochemical
performance of solid-state batteries.
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