期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 62, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202301073
关键词
Anode-Free Li-Metal Batteries; Current Collector; Dead Li; SrF2; SrI2
To address the short cyclic life issue of conventional anode-free Li-metal batteries (AFLMBs), SrI2 was introduced to effectively suppress dead Li accumulation by reactivating it through reversible I-/I-3(-) redox reaction. Additionally, a dielectric SEI surface with SrF2 and LiF was formed to prevent electrolyte decomposition, and a highly ionic conductive (3.488 mS cm(-1)) inner layer of SEI with abundant LiI enabled efficient Li+ transfer. With the SrI2-modified current collector, the NCM532/CP cell exhibited unprecedented cyclic performances with a capacity of 129.2 mAh g(-1) after 200 cycles.
Without excess Li, anode-free Li-metal batteries (AFLMBs) have been proposed as the most likely solution to realizing highly-safe and cost-effective Li-metal batteries. Nevertheless, short cyclic life puzzles conventional AFLMBs due to anodic dead Li accumulation with a local current concentration induced by irreversible electrolyte depletion, insufficient active Li reservoir and slow Li+ transfer at the solid electrolyte interphase (SEI). Herein, SrI2 is introduced into carbon paper (CP) current collector to effectively suppress dead Li through synergistic mechanisms including reversible I-/I-3(-) redox reaction to reactivate dead Li, dielectric SEI surface with SrF2 and LiF to prevent electrolyte decomposition and highly ionic conductive (3.488 mS cm(-1)) inner layer of SEI with abundant LiI to enable efficient Li+ transfer inside. With the SrI2-modified current collector, the NCM532/CP cell delivers unprecedented cyclic performances with a capacity of 129.2 mAh g(-1) after 200 cycles.
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