Reactivity of Amide Based Solutions in Lithium鈥揙xygen Cells
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- 作者：Daniel Sharon ; Daniel Hirsberg ; Michal Afri ; Arnd Garsuch ; Aryeh A. Frimer ; Doron Aurbach
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：July 17, 2014
- 年：2014
- 卷：118
- 期：28
- 页码：15207-15213
- 全文大小：376K
- ISSN：1932-7455
文摘
The stability of electrolyte solutions during lithium鈥搊xygen cells operation is of great importance and interest. This is because oxides formed during reduction are strong nucleophiles which can initiate solvent decomposition. The highly polar amide based solvents have come to the fore as possible candidates for Li鈥揙2 applications. They show typical cycling behavior as compared to other solvents; however, their stability toward lithium oxides is shrouded in doubt. The present study has focused on Li鈥揙2 cells containing electrolyte solutions based on DMA/LiNO3. We have used various analytical tools, to explore the discharge鈥揷harge processes and related side reactions. The data obtained from FTIR, NMR, XPS, and EQCM all support a rational decomposition mechanism. The formation of various side products during the course the first discharge, leads to the conclusion that amide based solvents are not suitable for Li鈥揙2 applications; however, electrolyte solution decomposition reduces the OER overpotential by forming oxidation mediators.