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确定在上与添加剂乙烯碳酸盐形成的固体电解质间相的结构基础

Yanting Jin¹, Nis-Julian H Kneusels¹, Pieter C M M Magusin¹

¹Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom.

Journal of the American Chemical Society

|September 22, 2017

概括

乙烯碳酸盐 (FEC) 添加剂抑制了离子电池阳极的线性聚合物形成. 它促进了分支聚合物,提高了固体电解质相间稳定性,以提高电池性能.

科学领域:

材料科学
电化学
分析化学

背景情况:

阳极为离子电池提供高容量,但由于SEI形成,其循环稳定性较差.
标准碳酸盐电解质会导致阳极上的不良线性聚合物副产品.
乙烯碳酸盐 (FEC) 是一种常见的电解质添加剂,但其在SEI形成中的确切作用尚未完全理解.

研究的目的:

研究乙烯碳酸盐 (FEC) 作为离子电池电解质中的添加剂的作用.
分析具有和没有FEC的阳极上的固体电解质间相 (SEI) 的结构演变.
阐明FEC在电化学循环中的反应途径.

主要方法:

使用先进的核磁共振 (NMR) 技术,包括溶液状态,固态和动态核极化NMR.
合成13C丰富的乙烯碳酸盐 (FEC),使其能够进行详细的NMR分析.
分析了阳极上形成的固体电解质间相 (SEI) 的有机成分.

主要成果:

含有10%体积的FEC可以抑制可溶性聚乙烯氧化物类线性寡合物的形成.
FEC被除,形成乙烯碳酸和维诺基基物种.
这些中间体反应产生可溶和不可溶的以乙烯氧化物为基础的分支聚合物.

结论:

乙烯碳酸盐 (FEC) 添加剂在改变阳极的SEI组成方面起着至关重要的作用.
FEC促进了分支聚合物的形成,这些聚合物在结构上与没有FEC形成的线性聚合物不同.
通过FEC抑制线性聚合物和形成分支聚合物可能有助于提高离子电池的循环稳定性.

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