Journal
JOURNAL OF MATERIALS SCIENCE
Volume 55, Issue 31, Pages 15213-15221Publisher
SPRINGER
DOI: 10.1007/s10853-020-04886-y
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Funding
- National Innovation Zone of Defence Science and Technology of China [8205100116]
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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
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