Correlating Lithium Hydroxyl Accumulation with Capacity Retention in V2O5 Aerogel Cathodes

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• 作者：Linda W. Wangoh ; Yiqing Huang ; Ryan L. Jezorek ; Aoife B. Kehoe ; Graeme W. Watson ; Fredrick Omenya ; Nicholas F. Quackenbush ; Natasha A. Chernova ; M. Stanley Whittingham ; Louis F. J. Piper
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 11, 2016
• 年：2016
• 卷：8
• 期：18
• 页码：11532-11538
• 全文大小：528K
• 年卷期：0
• ISSN：1944-8252

文摘

V₂O₅ aerogels are capable of reversibly intercalating more than 5 Li⁺/V₂O₅ but suffer from lifetime issues due to their poor capacity retention upon cycling. We employed a range of material characterization and electrochemical techniques along with atomic pair distribution function, X-ray photoelectron spectroscopy, and density functional theory to determine the origin of the capacity fading in V₂O₅ aerogel cathodes. In addition to the expected vanadium redox due to intercalation, we observed LiOH species that formed upon discharge and were only partially removed after charging, resulting in an accumulation of electrochemically inactive LiOH over each cycle. Our results indicate that the tightly bound water that is necessary for maintaining the aerogel structure is also inherently responsible for the capacity fade.