Enhanced Electrochemical Stability of Quasi-Solid-State Electrolyte Containing SiO2 Nanoparticles for Li-O2 Battery Applications

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• 作者：Hyunjin Kim ; Tae Young Kim ; Victor Roev ; Heung Chan Lee ; Hyuk Jae Kwon ; Hyunpyo Lee ; Soonchul Kwon ; Dongmin Im
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：January 20, 2016
• 年：2016
• 卷：8
• 期：2
• 页码：1344-1350
• 全文大小：476K
• ISSN：1944-8252

文摘

A stable electrolyte is required for use in the open-packing environment of a Li-O₂ battery system. Herein, a gelled quasi-solid-state electrolyte containing SiO₂ nanoparticles was designed, in order to obtain a solidified electrolyte with a high discharge capacity and long cyclability. We successfully fabricated an organic–inorganic hybrid matrix with a gelled structure, which exhibited high ionic conductivity, thereby enhancing the discharge capacity of the Li-O₂ battery. In particular, the improved electrochemical stability of the gelled cathode led to long-term cyclability. The organic–inorganic hybrid matrix with the gelled structure played a beneficial role in improving the ionic conductivity and long-term cyclability and diminished electrolyte evaporation. The experimental and theoretical findings both suggest that the preferential binding between amorphous SiO₂ and polyethylene glycol dimethyl ether (PEGDME) solvent led to the formation of the solidified gelled electrolyte and improved electrochemical stability during cycling, while enhancing the stability of the quasi-solid state Li-O₂ battery.