Real-Time XRD Studies of Li鈥揙2 Electrochemical Reaction in Nonaqueous Lithium鈥揙xygen Battery

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• 作者：Hyunseob Lim ; Eda Yilmaz ; Hye Ryung Byon
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：November 1, 2012
• 年：2012
• 卷：3
• 期：21
• 页码：3210-3215
• 全文大小：356K
• 年卷期：v.3,no.21(November 1, 2012)
• ISSN：1948-7185

文摘

Understanding of electrochemical process in rechargeable Li鈥揙₂ battery has suffered from lack of proper analytical tool, especially related to the identification of chemical species and number of electrons involved in the discharge/recharge process. Here we present a simple and straightforward analytical method for simultaneously attaining chemical and quantified information of Li₂O₂ (discharge product) and byproducts using in situ XRD measurement. By real-time monitoring of solid-state Li₂O₂ peak area, the accurate efficiency of Li₂O₂ formation and the number of electrons can be evaluated during full discharge. Furthermore, by observation of sequential area change of Li₂O₂ peak during recharge, we found nonlinearity of Li₂O₂ decomposition rate for the first time in ether-based electrolyte.

Keywords:

Li鈭扥₂ battery; in situ XRD; Li₂O₂; nonaqueous electrolyte