Capacitance of porous carbon electrode in mixed salt non-aqueous electrolytes
Capacitance of porous carbon electrode in mixed salt non-aqueous electrolytes
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DOI：
10.1016/j.jpowsour.2009.09.041
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发表时间：
2010-03
影响因子：
9.2
通讯作者：
M. Egashira;Nozomu Sawada;K. Ueda;N. Yoshimoto;M. Morita
中科院分区：
文献类型：
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作者：
M. Egashira;Nozomu Sawada;K. Ueda;N. Yoshimoto;M. Morita
研究了多孔碳电极在含有不同组成的四乙基铵四氟硼酸盐（TEABF 4）和锂盐的非水电解液中的电容特性，探讨了多孔碳电极在双电层电容器中的潜在应用。在碳酸乙烯酯（EC）和碳酸二乙酯（DMC）的混合溶剂中溶解TEABF 4和LiBF 4制备的电解液中，活性炭纤维（ACF）电极的循环伏安图显示出比TEABF 4单盐电解液更大的电容。含有LiBF 4-TEABF 4混合盐电解质的对称电容器电池在恒流测试中也表现出比含有TEABF 4单盐电解质的电池更大的电容，而对于该电池可观察到显著程度的电容劣化，而在ACF电极的控制电位为-0.2至1.0V vs. Ag下的测试在30次循环中提供了一定程度上稳定的电容。
Capacitances of a porous carbon electrode in non-aqueous electrolytes containing tetraethylamonium tetrafluoroborate (TEABF4) and a lithium salt with various compositions have been investigated for the potential use in electric double layer capacitor. In the electrolyte prepared by dissolving TEABF4and LiBF4into the mixed solvent of ethylene carbonate (EC) with diethyl carbonate (DMC), an activated carbon fiber (ACF) electrode exhibits a larger capacitance than in TEABF4single salt electrolyte on cyclic voltammograms. The symmetrical capacitor cell containing the LiBF4–TEABF4mixed salt electrolyte also exhibits larger capacitance on a constant-current test compared with that containing the TEABF4single salt electrolyte, while the capacitance degradation is observable for this cell at a significant extent, while the test under controlled potential of the ACF electrode to −0.2 to 1.0V vs. Ag provides somewhat stable capacitance over 30 cycles.