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Selective Permeable Lithium‐Ion Channels on Lithium Metal for Practical Lithium–Sulfur Pouch Cells
Author(s) -
Chen PengYu,
Yan Chong,
Chen Pengyu,
Zhang Rui,
Yao YuXing,
Peng HongJie,
Yan LiTang,
Kaskel Stefan,
Zhang Qiang
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202101958
Subject(s) - lithium (medication) , faraday efficiency , alkali metal , lithium vanadium phosphate battery , inorganic chemistry , electrolyte , anode , electrochemistry , chemistry , materials science , electrode , organic chemistry , medicine , endocrinology
Lithium metal batteries are considered a promising candidate for high‐energy‐density energy storage. However, the strong reducibility and high reactivity of lithium lead to low Coulombic efficiency when contacting oxidants, such as lithium polysulfide caused by the serious “shuttle effect” in lithium–sulfur batteries. Herein we design selectively permeable lithium‐ion channels on lithium metal surface, which allow lithium ions to pass through by electrochemical overpotential, while the polysulfides are effectively blocked due to the much larger steric hindrance than lithium ions. The selective permeation of lithium ions through the channels is further elucidated by the molecular simulation and visualization experiment. Consequently, a prolonged cycle life of 75 cycles and high Coulombic efficiency of 99 % are achieved in a practical Li–S pouch cell with limited amounts of lithium and electrolyte, confirming the unique role the selective ion permeation plays in protecting highly reactive alkali metal anodes in working batteries.