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Dynamic Ion Sieve as the Buffer Layer for Regulating Li~+ Flow in Lithium Metal Batteries

机译：Dynamic Ion Sieve as the Buffer Layer for Regulating Li~+ Flow in Lithium Metal Batteries

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摘要

How to realize uniform Li~+ flow is the key to achieve even Li depositionfor lithium metal batteries (LMBs). In this study, a concept of dynamicion sieve is proposed to design the buffer layer nearby Li anode surface toregulate Li~+ spatial arrangement by introducing tributylmethylphosphoniumbis(trifluoromethanesulfonyl)imide (TMPB) into the carbonate electrolyte.The buffer layer induced by TMP~+ can adjust the velocity of arriving solvatedLi~+ that gives solvated Li~+ sufficient time to redistribute and accumulate onLi anode surface, resulting in a uniform and higher concentrated Li~+ flow.Besides, TFSI~? can participate in the generation of inorganic componentrichsolid electrolyte interphase (SEI) with Li3N, which can facilitate the Li~+conductivity of SEI. Consequently, the stable and uniform Li deposition canbe obtained, achieving the excellent cycling performance up to 1000 h at0.5 mA cm~(?2) in the Li||Li symmetric cell. Besides, the Li||NCM622 full cell alsopossesses excellent cycling stability with a high-capacity retention rate of66.7% after 300 cycles.

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