Formation of Interfacial Layer and Long-Term Cyclability of Li鈥揙2 Batteries

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• 作者：Eduard N. Nasybulin ; Wu Xu ; B. Layla Mehdi ; Edwin Thomsen ; Mark H. Engelhard ; Robert C. Mass茅 ; Priyanka Bhattacharya ; Meng Gu ; Wendy Bennett ; Zimin Nie ; Chongmin Wang ; Nigel D. Browning ; Ji-Guang Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：August 27, 2014
• 年：2014
• 卷：6
• 期：16
• 页码：14141-14151
• 全文大小：899K
• ISSN：1944-8252

文摘

The long-term operation of Li鈥揙₂ batteries under full discharge/charge conditions is investigated in a glyme-based electrolyte. The formation of stable interfacial layer on the electrode surface during the initial cycling stabilizes reaction products at subsequent cycling stages as demonstrated by quantitative analyses of the discharge products and the gases released during charging. There is a quick switch from the predominant formation of Li₂O₂ to the predominant formation of side products during the first few cycles. However, after the formation of the stable interfacial layer, the yield of Li₂O₂ in the reaction products is stabilized at about 33鈥?0%. Extended cycling under full discharge/charge conditions is achievable upon selection of appropriate electrode materials (carbon source and catalyst) and cycling protocol. Further investigation on the interfacial layer, which in situ forms on air electrode, may increase the long-term yield of Li₂O₂ during the cycling and enable highly reversible Li鈥揙₂ batteries required for practical applications.

Keywords:

Li鈭扥₂ battery; rechargeability; carbon nanotubes; Li₂O₂; cyclability