Designing ionic liquids for stabilizing lithium metal batteries
발표자
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초록
내용
Uncontrollable Li dendritic growth, which exacerbates the safety and cycling efficiency of Li metal batteries (LMBs) hinders the practical use of LMBs. Ionic liquid (IL) electrolyte can circumvent this shortcoming via the synergistic effects of their cation and anion, but the effects of the structure and charge in the IL’s components on mitigating the dendrite growth have not yet been studied. Herein, We design a new class of IL additives consisting of a pyrrolidinium-based cation—with varied functional groups, chain lengths and numbers of charge—and a bis(fluorosulfonyl)imide anion. Li interphase characterization revealed ether-based cations build a durable solid-electrolyte interphase while a long chain with a high charge generates a lithiophobic effect, which induces a uniform Li deposition. This work suggests a design protocol for IL-based electrolytes and provides a prospective way to high efficiency, stable-cycling LMBs.