We explore different electrolytes containing lithium perchlorate (LiClO₄) and lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) salts in various solvents at different temperatures to associate the electrochemical stability of lithium titanium oxide (LTO)/lithium manganese oxide (LMO)-activated carbon (AC) composite li-ion hybrid supercapacitors. By varying the solvents and operation temperature, we were able to detect a correlation between the electrochemical performance and the conductivity of each electrolyte. To test the electrochemical stability and longevity of the electrolytes in such a system, full-cells were analyzed via a voltage floating for 10 h at charged state (2.8 V) of the full-cell. Energy and power performance were the highest for acetonitrile (ACN) containing electrolytes due to its high lithium-ion conductivity. Additionally, the longevity of LiClO₄ in 3-methoxypropionitrile (3-MPN) was superior to the performance among the electrolytes tested at ambient temperature with 97% capacity retention and energy efficiency of about 86% after 500 h of voltage floating. The test at 60 °C and 75 °C showed outweighing the performance of LiClO₄ in a mixture of ACN and ethylene carbonate (EC) with 70% capacity retention after 500 h voltage floating, with a corresponding energy efficiency of ∼85%, and 50% capacity retention after 250 h voltage floating, respectively. The longevity of LiTFSI in ACN and LiClO₄ in 3-MPN electrolyte demonstrated capacity retention of 97% and 92% after 500 h voltage floating, respectively, at low temperature (−10 °C).

我们探索了包含高氯酸锂（LiClO ₄）和双（三氟甲基磺酰基）酰亚胺锂（LiTFSI）盐在各种溶剂中于不同温度下结合锂钛氧化物（LTO）/锰酸锂（LMO）活化碳（AC）复合锂离子混合超级电容器的电化学稳定性。通过改变溶剂和操作温度，我们能够检测出电化学性能和每种电解质的电导率之间的相关性。为了测试这种系统中电解质的电化学稳定性和寿命，通过在全电池的充电状态（2.8 V）下浮动10小时的电压来分析全电池。含乙腈（ACN）的电解质由于具有高的锂离子传导性，因此其能量和功率性能最高。另外，LiClO ₄的寿命长3-甲氧基丙腈（3-MPN）中的氯丁酸在环境温度下的测试性能优于电解质，在电压浮动500小时后的容量保持率为97％，能量效率约为86％。在60°C和75°C下的测试表明，在ACN和碳酸亚乙酯（EC）的混合物中，LiClO ₄的性能优于电压浮动500 h后具有70％的容量保持率，相应的能量效率为〜85％，并且250 h电压浮动后，容量保持率分别为50％。在低温（-10°C）下浮动500 h后，ACN中的LiTFSI和3-MPN电解质中的LiClO ₄的寿命分别显示了97％和92％的容量保持率。