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

通过乙二醇诱导策略成功地设计和构建了结晶@非结晶NiCo₂S₄@MoS₂(v-NCS@MS)纳米结构，利用非结晶MoS₂壳层的柔性保护和带缺陷的内部核 NiCo₂S₄的高比容量，使 v-NCS@MS电极具有高比容量(1 A·g^-1时 1 034 mAh·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15 000次后容量保持率高达80.5%。

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

Crystalline@amorphous NiCo₂S₄@MoS₂ (v-NCS@MS) nanostructures were designed and constructed via an ethylene glycolinduced strategy with hydrothermal synthesis and solvothermal method, which simultaneously realized the defect regulation of crystal NiCo₂S₄ in the core. Taking advantage of the flexible protection of an amorphous shell and the high capacity of a conductive core with defects, the v-NCS@MS electrode exhibited high specific capacity (1 034 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 15 000 cycling at different current densities.