Pure ionic liquid electrolytes compatible with a graphitized carbon negative electrode in rechargeable lithium-ion batteries
Pure ionic liquid electrolytes compatible with a graphitized carbon negative electrode in rechargeable lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2006.02.077
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发表时间：
2006-11-08
影响因子：
9.2
通讯作者：
Kono, Michiyuki
中科院分区：
文献类型：
--
作者：
Ishikawa, Masashi;Sugimoto, Toshinori;Kono, Michiyuki
由双(氟磺酰亚胺)(FSI)作为阴离子和1-乙基-3-甲基咪唑(EMI)或N-甲基-N-丙基吡咯烷(P-13)作为阳离子组成的常温离子液体具有以下理想的物理化学性质，特别是对于电池电解液：高离子电导率，低粘度和低熔点。在通常的离子液体中，0.5V左右的不可逆阳离子嵌入石墨烯夹层是一个重要而常见的问题，但我们发现，含有锂离子的FSI离子液体可以防止这种不可逆的反应，并提供可逆的石墨烯夹层锂嵌入。我们的实验结果发现，在以含锂离子的EMI-FSI为电解液的半电池中，石墨负极在0.2℃的充放电倍率下，在30次循环中的可逆容量约为360mAHg(-1)。本论文可能是首次报道，当选择适当的反阴离子，如FSI时，“纯”离子液体可以在常温下为石墨化负极提供稳定的可逆容量。(C)2006爱思唯尔B.V.保留所有权利。
Ambient temperature ionic liquids composed of bis(fluorosulfonyl)imide (FSI) as an anion and 1-ethyl-3-methylimidazolium (EMI) orN-methyl-N-propylpyrrolidinium (P-13) as a cation have the following desirable physicochemical properties, particularly for a battery electrolyte: a high ionic conductivity, low viscosity, and a low melting point. While an irreversible cationic intercalation into graphene interlayers at ca. 0.5 V versus Li/Li+ has been a significant and common problem with usual ionic liquids, we found that ionic liquids containing FSI with the Li cation can prevent such an irreversible reaction and provide reversible Li intercalation into graphene interlayers. Our experimental results found the reversible capacity of a graphite negative electrode, in a half-cell with EMI-FSI containing the Li cation as an electrolyte, to be a stable value of approximately 360 mAh g(--1) during 30 cycles at a charge/discharge rate of 0.2 C, The present paper may be the first report that a "pure" ionic liquid can provide a stable, reversible capacity for a graphitized negative electrode at an ambient temperature without any additives or solvents when an appropriate counter anion, e.g., FSI, is selected. (C) 2006 Elsevier B.V. All rights reserved.