Cycling characteristics of lithium metal batteries assembled with a surface modified lithium electrode

• Published in: Journal of power sources Vol. 244; pp. 363 - 368
• Main Authors: Choi, Sung Min, Kang, Ik Su, Sun, Yang-Kook, Song, Jung-Hoon, Chung, Seok-Mo, Kim, Dong-Won
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.12.2013; Elsevier
• Subjects: Applied sciences; Contact; Cycles; Dendritic structure; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrodes; Electrolytic cells; Exact sciences and technology; Galvanic corrosion; Lithium; Lithium electrode; Lithium metal battery; Poly(vinylene carbonate-co-acrylonitrile); Protective; Protective layer; Solid electrolyte interphase; Solid electrolyte interphase; Lithium metal battery; Protective layer; Lithium electrode; Poly(vinylene carbonate-co-acrylonitrile); Lithium ion batteries; Cycling; Solid electrolyte interface; Organic carbonate; Alkaline storage battery; Solid electrolyte; Electrode electrolyte interface; Lithium; Secondary cell; Surface treatment; Lithium battery; Electrodes; Polycarbonate; Electrical characteristic; Modified material
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2012.12.106

The surface modified lithium electrode is prepared by coating an ionic conductive poly(vinylene carbonate-co-acrylonitrile) layer as a solid electrolyte interphase on lithium metal. The thin protective polymer layer with strong adhesion to the lithium electrode suppresses the corrosion of lithium metal and stabilizes the interface of lithium electrode in prolonged contact with organic electrolyte. Cycling performance of the Li/LiCoO2 cells can be improved by using the surface modified lithium electrode. SEM analysis of lithium electrodes after repeated cycling reveals that the use of a surface modified lithium electrode effectively suppresses dendrite growth during cycling, which results in stable cycling characteristics compared to that of the cell with an un-modified lithium electrode. ► The surface modified lithium electrode is prepared by coating a protective polymer layer. ► The protective layer stabilizes the interface of lithium in contact with electrolyte. ► The cell with surface modified Li electrode exhibits good cycling performance.