Stability of spinel Li₄Ti₅O₁₂ in air

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• 作者：Yurui Gao ; Zhaoxiang Wang ; Liquan Chen
• 关键词：Lithium ion batteries ; Stability ; First-principles calculation ; Surface
• 刊名：Journal of Power Sources
• 出版年：2014
• 出版时间：1 January, 2014
• 年：2014
• 卷：245
• 期：Complete
• 页码：684-690
• 全文大小：1967 K

文摘

As a promising anode material alternative to the carbons, Li₄Ti₅O₁₂ has drawn wide attention for its overwhelming advantages in meeting requirements of lithium ion batteries with high power density, long cycling life and safety for electric vehicles and electricity storage stations. Its stability issue during storage is interesting and of large importance. In this work, the stability of commercial spinel Li₄Ti₅O₁₂ material in air has been characterized by a series of physical and electrochemical techniques. First-principles calculations indicate that Li₄Ti₅O₁₂ is lithium-truncated at the surface. This explains why it tends to absorb H₂O and CO₂ to form Li₂CO₃ but the formation of Li₂CO₃ does not significantly impact its electrochemical performances.