화학공학소재연구정보센터
Journal of Materials Science, Vol.55, No.31, 15213-15221, 2020
Amorphous cobalt sulfide/N-doped carbon core/shell nanoparticles as an anode material for potassium-ion storage
Transition metal sulfides (TMSs), owing to their high theoretical specific capacity, unique chemical and physical properties, were established as promising anode materials for potassium-ion batteries. However, the large volume expansion of the well-crystallized TMSs has an important influence on the structural stability during cycling. Herein, amorphous cobalt sulfide/N-doped carbon core/shell nanoparticles (ACSNPs) are obtained and work as preeminent anode and display excellent potassium storage performance. After 200 cycles, the ACSNPs show a reversible capacity of 253.4 mAh g(-1)at 50 mA g(-1), with a much better cycling stability than commercial cobalt sulfide. Amorphous cobalt sulfide wrapped in a N-doped flexible carbon shell not only suppresses the aggregation of small grains, but also confines the cobalt sulfide particles and inhibits large volume expansion during K-ion intercalation/deintercalation. Graphic abstract