异氰酸酯
碳酸丙烯酯
碳酸乙烯酯
电解质
聚合
高分子化学
单体
丙烯酸酯
化学
石墨
双功能
材料科学
甲基丙烯酸酯
电极
有机化学
聚氨酯
聚合物
催化作用
物理化学
作者
Yongeun Kim,Cheolsoo Jung
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2023-11-01
卷期号:170 (11): 110519-110519
标识
DOI:10.1149/1945-7111/ad09fb
摘要
Propylene carbonate (PC) has the advantage of a much lower melting point than ethylene carbonate (EC), but it cannot suppress the exfoliation of graphite layers because of its cointercalation with Li + before forming a stable solid electrolyte interface (SEI). This paper introduces 2−isocyanatoethyl methacrylate (ICEMA) as an additive in PC−based electrolytes. ICEMA is a bifunctional monomer in which the isocyanate group is linked by the ethyl group to the acrylate group, which reacts through thermal polymerization. The isocyanate moiety is initiated as a radical during the initial charging process to induce electropolymerization and reaction with the PC radical. Radicals propagate through the entire reaction at the electrode to form a stable SEI. The modified interface suppresses the cointercalation of Li + −PC to graphite electrode. In situ Fourier transform infrared effectively showed the polymerization of the isocyanate and active reaction with the PC radical. Consequently, the reaction mechanisms to form the stable SEI in PC−based electrolytes were determined.
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