The synthesis, spectroscopic and electrochemical characterization of Li[N(SiMe₃)(SO₂R^F)] (R^F=CF₃, n‐C₄F₉) as well their behavior as electrolyte additive in lithium ion batteries (LIBs) is reported. The lithium salts were obtained by deprotonation of the corresponding acids HN(SiMe₃)(SO₂R^F) with n‐butyllithium in n‐pentane. The electrochemical investigations suggested potential as additives for LIBs. Thus, NCM111/graphite cells (NCM111=Li[Ni_0.33Co_0.33Mn_0.33]O₂) with LP57 as electrolyte (LP57=1.0 M LiPF₆ in EC/EMC 3 : 7) were built to test the performance. Cells with Li[N(SiMe₃)(SO₂R^F)] as additives show coulombic efficiencies of over 99.6 %, less capacity fading over 55 cycles and a significantly lower cell impedance built up.

中文翻译：

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不对称酰亚胺作为NCM111阴极锂离子电池的电解质添加剂

Li [N（SiMe ₃）（SO ₂ R ^F）]（R ^F = CF ₃，n- C ₄ F ₉）的合成，光谱和电化学表征及其在锂离子电池（LIBs）中作为电解质添加剂的行为被报道。锂盐是通过在正戊烷中用正丁基锂对相应的酸HN（SiMe ₃）（SO ₂ R ^F）进行质子化而获得的。电化学研究表明有潜力作为LIBs的添加剂。因此，NCM111 /石墨晶胞（NCM111 = Li [Ni _0.33 Co _0.33 Mn用LP57作为电解质（EC / EMC 3：7中的LP57 = 1.0 M LiPF ₆）构建_0.33 [O ₂）以测试性能。含有Li [N（SiMe ₃）（SO ₂ R ^F）]作为添加剂的电池显示库仑效率超过99.6％，在55个循环中容量衰减较小，并且电池阻抗明显降低。