A novel Et4NBF4 and LiPF6 blend salts electrolyte for supercapacitor battery

作者：Liu, Shengqi; Liu, Suqin; Huang, Kelong; Liu, Jiansheng; Li, Yongkun; Fang, Dong; Wang, Hongmei; Xia, Yufei

来源：Journal of Solid State Electrochemistry, 2012, 16(4): 1631-1634.

DOI：10.1007/s10008-011-1573-7

• Blend salts electrolyte
• Supercapacitor battery
• Et4NBF4
• (LiMn2O4+AC)/Li4Ti5O12

Electrolytes of 1 M blend salts (LiPF6 and tetraethylammonium tetrafluoroborate, Et4NBF4) have been investigated in supercapacitor battery system with composite LiMn2O4 and activated carbon (AC) cathode, and Li4Ti5O12 anode. The results obtained with the blend salts electrolytes are compared with those obtained with cells build using standard 1 M LiPF6 dissolved in ethylene carbonate + dimethyl carbonate + ethyl (methyl) carbonate (EC + DMC + EMC, 1:1:1 wt.%) as electrolyte. It is found that the blend salts electrolyte performs better on both electrochemical and galvanostatic cycling stability, especially cycled at 4 C rate. When the concentration of LiPF6 is 0.2 M and Et4NBF4 is 0.8 M, the capacity retention of the battery is 96.23% at 4 C rate after 5,000 cycles, much higher than that of the battery with standard 1 M LiPF6 electrolyte, which is only 62.35%. These results demonstrate that the blend salts electrolyte can improve the galvanostatic cycling stability of the supercapacity battery. Electrolyte of 0.2 M LiPF6 + 0.8 M Et4NBF4 in EC + DMC + EMC (1:1:1 wt.%) is a promising electrolyte for (LiMn2O4 + AC)/Li4Ti5O12.

• 出版日期2012-4
• 单位武汉纺织大学