溶剂化
化学
锂(药物)
电解质
溶剂化壳
离子
离解(化学)
分子
无机化学
碳酸锂
碳酸盐离子
化学物理
物理化学
离子键合
有机化学
电极
内分泌学
医学
作者
Yeongseok Chae,Chaiho Lim,Jonggu Jeon,Min-Ju Kim,Kyungkoo Lee,Kyungwon Kwak,Minhaeng Cho
标识
DOI:10.1021/acs.jpclett.2c02106
摘要
Lithium-ion batteries face insufficient capacity at low temperatures. The lithium-ion desolvation process in the vicinity of a solid electrolyte interphase (SEI) layer is considered the major problem. Thus, an accurate determination of lithium-ion solvation structures is a prerequisite for understanding this process. Here, using a cryostat combined with an FTIR spectrometer, we found that as the temperature decreased, the number of coordinating carbonates in the first solvation shell of the lithium ion increased with a decreased population of the contact ion pair (CIP). More specifically, we found that two or more carbonate molecules replace a single PF6– anion upon CIP dissociation. This experimental finding shows that the prevailing notion that four carbonate molecules coordinate each lithium ion to form a tetrahedral structure is invalid for describing lithium-ion solvation structures. We anticipate that the present work will elucidate one of the molecular origins behind the low performance of lithium-ion batteries at low temperatures.
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