Investigation of the Cathode鈥揅atalyst鈥揈lectrolyte Interface in Aprotic Li鈥揙2 Batteries

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• 作者：Marshall A. Schroeder ; Alexander J. Pearse ; Alexander C. Kozen ; Xinyi Chen ; Keith Gregorczyk ; Xiaogang Han ; Anyuan Cao ; Liangbing Hu ; Sang Bok Lee ; Gary W. Rubloff ; Malachi Noked
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：August 11, 2015
• 年：2015
• 卷：27
• 期：15
• 页码：5305-5313
• 全文大小：666K
• ISSN：1520-5002

文摘

Enabled by a unique integrated fabrication and characterization platform, X-ray photoelectron spectroscopy (XPS) studies reveal the formation of a thin solid electrolyte interphase (SEI) layer on a Li鈥揙₂ cathode after the first cycle. Subsequent cycling indicates that this SEI layer is very stable in terms of both chemistry and morphology, even after extensive cycling, preserving reversibility at the cathode/electrolyte interface. Remarkably, even after cell failure, replacement of the lithium anode resulted in recovery of the cycling behavior with the same cathode. These results demonstrate that chemical stabilization of the cathode/electrolyte interface promotes long-term operation of DMSO-based Li鈥揙₂ Ru-catalyzed batteries. Characterization of the Li anode surface reveals electrolyte decomposition, and a partial mechanism is proposed for the observed chemical composition of the cathode SEI. These studies are enabled by conformal deposition of a heterogeneous OER catalyst on a freestanding, binder-free, mesoporous, carbon-based Li鈥揙₂ cathode with high capacity and long-term cycling stability.