Atomic Layer Deposition of LixAlyS Solid‐State Electrolytes for Stabilizing Lithium‐Metal Anodes. Issue 6 (6th April 2016)

• Record Type: Journal Article
• Authors: Cao, Yanqiang; Meng, Xiangbo; Elam, Jeffrey W.
• Is Part Of: ChemElectroChem. Volume 3:Issue 6(2016)
• Page Start: 858
• Page End: 863
• Publication Date: 2016-04-06
• Subjects: atomic layer deposition -- dendrites -- energy storage -- lithium -- solid-state electrolytes; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201600139
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: 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. Abstract : Stunted growth : Lithium metal electrodeposited onto bare copper electrode produces rough, dendritic morphology, but atomic layer deposition of a Li x Al y S coating with high Li + conductivity suppresses Li dendrite growth.