【摘要】 制备并表征了双(三氟乙氧基磺酰)亚胺{[N(SO2OCH2CF3)2]-,TFESI-}和双(六氟异丙氧基磺酰)亚胺({N[SO2OCH(CF3)2]2}-,HFPSI-)2个阴离子的10种碱金属盐,并采用示差扫描量热仪(DSC)和热重分析仪(TGA)研究了其相变行为和热稳定性.测试了LiTFESI和LiHFPSI与碳酸乙烯酯(EC)/碳酸甲乙酯(EMC)(3∶7,体积比)组成的电解液的电导率、氧化电位及对铝箔的腐蚀性.结果表明,所制备的碱金属盐均具有较高的纯度和热分解温度(>200℃)及较低的熔点(117~211℃);LiTFESI-EC/EMC和LiHFPSIEC/EMC电解液均具有较高的电导率和氧化电位,并对铝箔具有良好的钝化性能,有可能作为锂离子电池的导电盐或添加剂.更多还原

【Abstract】 Two series of alkali salts of bis(polyfluoroalkyloxysulfonyl) imides,alkali bis(2,2,2-trifluoroethoxysulfonyl) imides{ M[N(SO2OCH2CF3)2],MTFESI} and alkali bis[(1,1,1,3,3,3-hexafluoro-2-propoxy) sulfonyl]imides(M{ N[SO2OCH(CF3)2]2},MHFPSI)(M = Li,Na,K,Rb,Cs),were prepared and characterized by NMR,IR and elemental analysis. Thermal properties of the neat salts were investigated by differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA). The fundamental physicochemical properties of nonaqueous electrolytes of lithium bis(polyfluoroalkyloxysulfonyl) imides are studied. The results indicate that the alkali bis(polyfluoroalkyloxysulfonyl) imides show high thermal stability and low melting point. The electrolytes of 1. 0 mol/L lithium salt in a mixture of ethylene carbonate(EC)/ethyl methyl carbonate(EMC)(3 ∶ 7,volume ratio) show medium conductivities,high oxidation potentials and do not corrode Al in the high potential region of 3—5 V(vs. Li+/Li).更多还原