【摘要】 制备了一种新型含氟磺酰亚胺锂盐(三氟甲基磺酰)(三氟乙氧基磺酰)亚胺锂{Li[(CF3SO2)·(CF3CH2OSO2)N],Li[TFO-TFSI]}及其与碳酸乙烯酯(EC)/碳酸甲乙酯(EMC)混合溶剂(3∶7,体积比)组成的非水电解液.采用核磁共振波谱(NMR)、红外光谱(IR)、质谱(MS)、元素分析(EA)和离子色谱(IC)等手段对合成锂盐Li[TFO-TFSI]进行了结构表征及纯度分析.通过差示量热扫描(DSC)和热重分析(TG)对Li[TFO-TFSI]及其电解液1.0 mol/L Li[TFO-TFSI]-EC/EMC(3∶7)的热学性质进行了表征.采用交流阻抗(EIS)、循环伏安(CV)、计时安培法及扫描电子显微镜(SEM)等对Li[TFO-TFSI]/碳酸酯电解液的基础物化和电化学性质进行了表征.结果表明,Li[TFO-TFSI]/碳酸酯电解液具有较好的电化学稳定性;在4.2 V(vs.Li/Li+)以下Al箔不发生腐蚀;室温下基于Li[TFO-TFSI]/碳酸酯电解液的Li/人造石墨和人造石墨/LiCoO2电池均保持较好的循环性能,特别是人造石墨/LiCoO2锂离子电池循环100周后,其比容量保持率明显高于相应的基于LiPF6/碳酸酯电解液体系的电池.更多还原

【Abstract】 A novel lithium salt, lithium( trifluoromethanesulfonyl)( trifluoroethoxysulfonyl) imide{ Li[( CF3SO2)( CF3CH2OSO2) N],Li[TFO-TFSI]},and the corresponding nonaqueous electrolytes of 1.0mol /L Li[TFO-TFSI]in a mixture of ethylene carbonate /ethyl methyl carbonate( EC /EMC,3 ∶ 7,volume ratio) were prepared. The structure,composition and purity of the as-prepared Li[TFO-TFSI] were confirmed by nuclear magnetic resonance spectroscopy( NMR),infrared spectroscopy( IR),mass spectrometry( MS),elemental analysis( EA),and ion chromatography( IC). The thermal properties of Li[TFO-TFSI]and its nonaqueous electrolytes,1. 0 mol /L Li[TFO-TFSI]-EC /EMC( 3 ∶ 7),were characterized by differential scanning calorimetry( DSC) and thermogravimetric analysis( TGA). The fundamental properties of nonaqueous electrolyte solution of Li[TFO-TFSI] were characterized by electrochemical impedance spectroscopy( EIS),cyclic voltammetry( CV),chronoamperometry and scanning electron microscope( SEM). The nonaqueous electrolytes of Li[TFO-TFSI]shows excellent electrochemical stability,and does not corrode Al below 4. 2 V. Both Li /synthetic graphite and synthetic graphite /LiCoO2 cells using Li[TFO-TFSI]show good cycling performances at room temperature,and the graphite /LiCoO2 cells using Li[TFO-TFSI] shows much better capacity retention after 100 cycles than those using LiPF6.更多还原