基于CoNi-双金属氢氧化物//AC非对称超级电容器的构筑（英文）  

A high energy density asymmetric supercapacitor based on a CoNi-layered double hydroxide and activated carbon

作　　者：谢莉婧[1] 孙国华[1] 谢龙飞[2] 苏方远[1] 李晓明[1] 刘卓[1] 孔庆强[1] 吕春祥[1] 李开喜[1] 陈成猛[1] 

机构地区：[1]中国科学院山西煤炭化学研究所炭材料重点实验室,山西太原030001 [2]辽宁工业大学,辽宁锦州121001

出　　处：《新型炭材料》2016年第1期37-45,共9页New Carbon Materials

基　　金：国家自然科学基金(51402324,51402325,51302281)~~

摘　　要：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)。A high performance asymmetric supercapacitor was fabricated using a CoNi-layered double hydroxide （CoNi-LDH） as the positive electrode and activated carbon as the negative electrode in an electrolyte of 6 M aqueous KOH. The supercapacitor can be cycled reversibly in a wide potential window of 0-1.5 V and exhibits a remarkable energy density of 46.3 Wh. kg-1 at a power density of 102.3 W.kg-1 , a high energy density of 25.6 Wh.kg-1 even at a high power density of 1 704.5 W.kg-1 These values are much higher than those of a symmetric supercapacitor using only activated carbon （6.9 Wh.kg-1 ）. The results can be ascribed to the high specific capacitance and rate capability of the CoNi-LDH, and the complementary potential windows of the two electrodes that increase the working voltage of the supercapacitor. The supercapacitor also exhibits stable cycling with a 84.5 % capacitance re- tention after 1 000 cycles.

关 键 词：钴镍双金属氢氧化物 纳米复合物 非对称超级电容器 能量存储 

分 类 号：TM53[电气工程—电器] TB383.1[一般工业技术—材料科学与工程]