期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 33, 页码 18031-18036出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202101958
关键词
lithium metal anode; lithium-sulfur batteries; polymer chains; pouch cell; selective permeable channels
资金
- Joint Committee of the Sino-German Center for Research Promotion [M-0240]
- National Natural Science Foundation of China [U1801257, 21825501]
- Scientific and Technological Key Project of Shanxi Province [20191102003]
- National Key Research and Development Program [2016YFA0202500]
- Tsinghua University Initiative Scientific Research Program
By designing selectively permeable lithium-ion channels on the surface of lithium metal, lithium ions can pass through while polysulfides are effectively blocked, resulting in improved performance and cycle life of lithium-sulfur batteries.
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.
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