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以高电容特性的CoNi-LDH作正极,活性炭作负极,6 mol/L KOH溶液为电解液构筑CoNi-LDH/AC非对称超级电容器。由于这两种材料在同一种电解液中发生可逆循环时对应的电化学电势范围不同,因此通过组合这两种电极材料可以有效地解决对称电容器工作电压低的问题。用循环伏安、恒电流充放电等测试方法对其电化学性能进行研究。结果表明,所组装非对称电容器在碱性水系电解液中,其工作电压可以达到1.5 V。通过比较它与基于两种电极材料对称电容器的能量密度-功率密度曲线可以看出,非对称电容器的性能有了很大提高,在功率密度为102.3 W·kg~(-1)时,其能量密度可以达到46.3 Wh·kg~(-1)。
CoNi-LDH / AC asymmetric supercapacitor was constructed by using CoNi-LDH with high capacitance as anode, activated carbon as anode, and 6 mol / L KOH as electrolyte. Since these two materials have different electrochemical potential ranges when reversible cycling occurs in the same electrolyte, the problem of low operating voltage of the symmetric capacitor can be effectively solved by combining the two electrode materials. Cyclic voltammetry, constant current charge and discharge test methods for electrochemical performance. The results show that the assembled asymmetric capacitor in alkaline aqueous electrolyte, the operating voltage can reach 1.5 V. By comparing it with the energy density-power density curve based on the two electrode material symmetric capacitors, we can see that the performance of the asymmetric capacitor has been greatly improved. At the power density of 102.3 W · kg -1, the energy The density can reach 46.3 Wh · kg -1.