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Reconstruction of Solid Electrolyte Interphase with SrI2 Reactivates Dead Li for Durable Anode‐Free Li‐Metal Batteries.

Authors :
Dong, Liwei
Zhong, Shijie
Yuan, Botao
Li, Yaqiang
Liu, Jipeng
Ji, Yuanpeng
Chen, Dongjiang
Liu, Yuanpeng
Yang, Chunhui
Han, Jiecai
He, Weidong
Source :
Angewandte Chemie. 6/5/2023, Vol. 135 Issue 23, p1-12. 12p.
Publication Year :
2023

Abstract

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−/I3− 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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00448249
Volume :
135
Issue :
23
Database :
Academic Search Index
Journal :
Angewandte Chemie
Publication Type :
Academic Journal
Accession number :
163911123
Full Text :
https://doi.org/10.1002/ange.202301073