Effects of non-equimolar lithium salt glyme solvate ionic liquid on the control of interfacial degradation in lithium secondary batteries
Effects of non-equimolar lithium salt glyme solvate ionic liquid on the control of interfacial degradation in lithium secondary batteries
复制标题
DOI：
10.1039/c6ra04404b
复制
发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Watanabe, Masayoshi
中科院分区：
文献类型：
--
作者：
Seki, Shiro;Serizawa, Nobuyuki;Watanabe, Masayoshi
控制电极和电解液之间的界面性质是获得长寿命锂离子二次电池的重要条件。为了控制界面降解，我们研究了改变锂盐(LiN(SO2CF3)(2))和低分子醚(CH3-O-(C2H4O)(3)-CH3)的组成比对体系界面退化的影响。通过提高锂盐组成比，实现了高电化学稳定性的锂盐Glyme溶剂化离子液体电解液，形成了寿命长、稳定性好的锂溶剂化络合物。使用该电解液的锂二次电池能够显著抑制电解液与正极(高氧化态)界面的界面电阻退化，从而延长电池的使用寿命。
Control of interfacial properties between the electrode and electrolyte is important for obtaining long lifecycle lithium-ion secondary batteries. To control interfacial degradation, we investigated the effect of changing the composition ratio of lithium salt (LiN(SO2CF3)(2)) and low-molecular-weight ether (CH3-O-(C2H4O)(3)-CH3) in the system. A highly electrochemically stable lithium salt glyme solvated ionic liquid electrolyte was realized, with long-lived, robust lithium solvation complexes by increasing the lithium salt composition ratio. Lithium secondary batteries using the electrolyte show notable suppression of the degradation of interfacial resistance at the interface of the electrolyte and the positive electrode (high oxidation state), which leads to a longer life-cycle of the batteries.