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Atomic Layer Deposition of Li x Al y S Solid‐State Electrolytes for Stabilizing Lithium‐Metal Anodes
Author(s) -
Cao Yanqiang,
Meng Xiangbo,
Elam Jeffrey W.
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600139
Subject(s) - lithium (medication) , electrolyte , anode , materials science , atomic layer deposition , metal , inorganic chemistry , layer (electronics) , lithium metal , deposition (geology) , lithium battery , chemical engineering , nanotechnology , ion , chemistry , electrode , metallurgy , ionic bonding , medicine , paleontology , organic chemistry , sediment , engineering , biology , endocrinology
Increasing global demands for energy storage in electric vehicles and the grid necessitate “beyond‐lithium‐ion” batteries that simultaneously exhibit high capacity, long‐term cyclability, and excellent safety. Several candidates, most notably lithium–air and lithium–sulfur batteries, utilize lithium‐metal anodes. Although the specific capacity of lithium metal is unrivaled (3860 mA h g −1 ), the capacity fade and risk of catastrophic failure must be overcome. Herein, we describe ultrathin, ionically conducting lithium aluminum sulfide (Li x Al y S) coatings prepared on lithium‐metal anodes by using atomic layer deposition, which stabilize the Li–electrolyte interface and reduce (up to five times) the interfacial impedance of lithium–metal anodes in contact with organic electrolyte. We demonstrate that these thin films effectively suppress dendrite formation and preserve a smooth, low‐surface‐area morphology for electrodeposited lithium metal, thereby doubling the lifetime of Li–Cu asymmetric cells.