Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
All-solid-state batteries (ASSBs) are garnering considerable interest as potential successors to traditional lithium-ion batteries, attributed to their enhanced safety and superior energy density. However, the interaction between solid electrolytes and cathode materials often leads to a decline in the performance of these electrochemical cells. An alternative method involves the creation of an artificial cathode electrolyte interphase (CEI) layer formed through reactions within the electrode materials. This research presents a novel approach in ASSBs to boost electrochemical performance by introducing a spontaneously formed lithium oxy-thiophosphate species and LiCl artificial CEI layer. This layer forms during thermal processing via chemical reactions between the solid electrolytes and residual lithium compounds on the LiNi0.9Co0.05Mn0.05O2 (NCM) cathode without causing degradation. During repetitive electrochemical cycling, the LPOS-LiCl layer effectively minimizes side reactions between the solid electrolytes and NCM. Consequently, the NCM full-cell with the LPOS-LiCl artificial CEI layer demonstrates 80.0% capacity retention following 300 cycles at a 0.2 C rate and room temperature.
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