Amorphous cobalt sulfide/N-doped carbon core/shell nanoparticles as an anode material for potassium-ion storage

Jun Hu, Bo Wang, Qiyao Yu*, Yanghuan Zhang*, Di Zhang, Ying Li*, Wei Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Abstract: 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: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)15213-15221
Number of pages9
JournalJournal of Materials Science
Volume55
Issue number31
DOIs
Publication statusPublished - 1 Nov 2020

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