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电化学  2014 

含PyR14TFSI电解液LiMn2O4正极高温电化学性能

DOI: 10.13208/j.electrochem.130110, PP. 66-72

Keywords: 离子液体,尖晶石型锰酸锂,N-甲基丁基吡咯烷二(三氟甲基磺酰)亚胺盐,安全性

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Abstract:

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1mol·L-1LiPF6EC/EMC/DMC(1:1:1,byvolume)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%(bymass)时,电解液DSC曲线由89.3oC、201oC、224oC三个强吸热峰变为116.6oC和244.3oC两个强吸热峰;50oC下,LiMn2O4倍率性能显著提高,2C放电比容量提高16mAh·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.

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