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首页> 外文期刊>Journal of power sources >Zwitterionic Imidazolium Compounds With High Cathodic Stability As Additives For Lithium Battery Electrolytes
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Zwitterionic Imidazolium Compounds With High Cathodic Stability As Additives For Lithium Battery Electrolytes

机译：具有高阴极稳定性的两性离子咪唑鎓化合物作为锂电池电解质的添加剂

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摘要

A series of imidazolium-based zwitterionic compounds having both a propylsulfonate group at 3-position and an ester group at 1- or 2-position are synthesized and their interactions with LiPF_6 are investigated. FT-IR study and theoretical calculation using density functional theory show that the interactions of the zwitterionic compound with LiPF_6 varies significantly with the location of the ester group on the imidazolium ring. The electrochemical stability of the imidazolium-based zwitterionic compound is significantly improved by introducing an ester group at the C-2 position of the imidazolium ring. Cycle performance tests show that the initial cell capacity remains almost unchanged up to 100 cycles at 1/2C when 2.5wt.% of 2-(acetoxymethy)-1-butylimidazolium-3-propylsulfonate is added to the model electrolyte consisting of ethylene carbonate (EC), dimethyl carbonate (DMC), and ethylmethyl carbonate (EMC) (EC/DMC/EMC=1/1/1 v/v/v), whereas the capacity of the cell containing an unsubstituted or methyl-substituted imidazolium compound at the C-2 position, 1-(acetoxymethyl)imidazolium-3-propylsulfonate or 1-(acetoxyrnethyl)-2-rnethylimidazolium-3-propylsulfonate as an additive, starts to decrease rapidly just after a few cycles.
机译：合成了一系列同时具有3位丙磺酸酯基和1位或2位酯基的咪唑基两性离子化合物，并研究了它们与LiPF_6的相互作用。 FT-IR研究和使用密度泛函理论的理论计算表明，两性离子化合物与LiPF_6的相互作用随咪唑环上酯基的位置而显着变化。通过在咪唑鎓环的C-2位引入酯基，可以显着提高咪唑鎓类两性离子化合物的电化学稳定性。循环性能测试表明，当将2.5wt。％的2-（乙酰氧基甲基）-1-丁基咪唑鎓-3-丙基磺酸盐添加到由碳酸亚乙酯组成的模型电解质中时，初始电池容量在1 / 2C的100个循环中几乎保持不变。 EC），碳酸二甲酯（DMC）和碳酸乙基甲基酯（EC / DMC / EMC = 1/1/1 v / v / v），而含有未取代或甲基取代的咪唑化合物的电池容量为在C-2位置，作为添加剂的1-（乙酰氧基甲基）咪唑鎓3-丙基磺酸盐或1-（乙酰氧基甲基）-2-甲基乙基咪唑鎓3-丙基磺酸盐在几个循环后迅速开始下降。

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