利用差示扫描量热仪（DSC）、电化学工作站、BTS电池测试系统、X-射线衍射仪（XRD）、扫描电子显微镜（SEM）和X射线能量色散谱（EDS）等方法，研究了含离子液体N-甲基丁基吡咯烷二(三氟甲基磺酰)亚胺盐（PyR₁₄TFSI）电解液性能以及LiMn₂O₄电极高温电化学性能. 结果表明，随着1 mol·L^-1 LiPF₆ EC/EMC/DMC（1:1:1，by volume）中PyR₁₄TFSI添加量的增大，电解液的电导率逐渐增大，添加量为2.5%（by mass）时，电解液DSC曲线由89.3 ^oC、201 ^oC、224 ^oC三个强吸热峰变为116.6 ^oC和244.3 ^oC两个强吸热峰；50 ^oC下，LiMn₂O₄倍率性能显著提高，2C放电比容量提高16 mAh·g^-1，100循环周期后容量保持率为88.3%（提高2.2%）. PyR₁₄TFSI添加有利于电极结构的稳定.

In this work, with an aim to improve the performance of spinel lithium manganese and to reduce the safety concern of Li-ion battery system, the effects of N-methyl-N-butylpyrrolidinium bis (trifluoromethylsulfonyl) imide (PyR₁₄TFSI) on performance of electrolyte and spinel lithium manganes are studied by using differential scanning calorimetry (DSC), BTS battery test system, electrochemical work station, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results indicate that the ionic conductivity of electrolyte is increased with the increase of PyR₁₄TFSI concentration. When the concentration of PyR₁₄TFSI is 2.5% (by mass), the DSC curves of the PyR₁₄TFSI containing electrolyte are changed from three strong endothermic peaks (89.3 ^oC, 201 ^oC, 224 ^oC) to two strong endothermic peaks (116.6 ^oC, 244.3 ^oC). At 50 ^oC, the rate capability is enhanced, the discharge capacity is increased by 16 mAh·g^-1, and the capacity retention is 88.3% (increased by 2.2%) after cycled for 100 times. PyR₁₄TFSI is beneficial to the stability of the electrode structure.