Crystalline and amorphous metal sulfide composite electrode materials with long cycle life:Preparation and performance of hybrid capacitors

长循环寿命结晶@非结晶金属硫化物复合电极材料的制备及其混合电容器性能

Crystalline@amorphous NiCo_(2)S_(4)@MoS_(2)(v-NCS@MS)nanostructures were designed and constructed via an ethylene glycol-induced strategy with hydrothermal synthesis and solvothermal method,which simultaneously realized the defect regulation of crystal NiCo_(2)S_(4) in the core.Taking advantage of the flexible protection of an amor-phous shell and the high capacity of a conductive core with defects,the v-NCS@MS electrode exhibited high specif-ic capacity(1034 mAh·g^(-1) at 1 A·g^(-1))and outstanding rate capability.Moreover,a hybrid supercapacitor was assembled with v-NCS@MS as cathode and activated carbon(AC)as anode,which can achieve remarkably high specific energy of 111 Wh·kg^(-1) at a specific power of 219 W·kg^(-1) and outstanding capacity retention of 80.5%after 15000 cycling at different current densities.

通过乙二醇诱导策略成功地设计和构建了结晶@非结晶Ni Co_(2)S_(4)@Mo S_(2)(v-NCS@MS)纳米结构,利用非结晶Mo S_(2)壳层的柔性保护和带缺陷的内部核Ni Co_(2)S_(4)的高比容量,使v-NCS@MS电极具有高比容量(1 A·g^(-1)时1034 m Ah·g^(-1))和出色的倍率性能。此外,以v-NCS@MS为正极、活性炭(AC)为负极组装的混合超级电容器在219 W·kg^(-1)的比功率下可获得111 Wh·kg^(-1)的高比能量,在不同电流密度下循环15000次后容量保持率高达80.5%。