화학공학소재연구정보센터
Applied Surface Science, Vol.486, 519-526, 2019
Micron-scaled MoS2/N-C particles with embedded nano-MoS2: A high-rate anode material for enhanced lithium storage
Nanostructured molybdenum disulfide (MoS2) is successfully embedded in the N-doped porous carbon to form micro-sized MoS2/N-C particles via a simple one-pot solution reaction. Yolk, a biomass carbon source with rich nitrogen and oxygen, makes a success to the heteroatom self-doping. The obtained N-doped porous carbon coating layers largely improve the conductivity and electrochemical activity. Moreover, the unique structure of MoS2 nanodots embedded in the porous carbon effectively combines the advantages of nanoscale MoS2 and micron scale N-doped C, which addresses the issues of MoS2 in lithium ion batteries (e.g., poor conductivity, sulfur loss and easy conglomeration). Interestingly, MoS2/N-C composite shows the first discharge/charge capacifies of 1002 and 724 mAh g(-1) at 0.1 A g(-1) and stabilizes around 805 mAh g(-1) after 100 cycles. Especially, it still remains at 630 mAh g(-1) even under 0.5 A g(-1) after 500 cycles, exhibiting excellent lithium ion (Li+) storage and cycle-to-cycle durability. This desired performance of MoS2/N-C is mainly resulted from the unique embedded structure, which effectively improves ion/electron transportation, ensures high sulfur reservation and prevents the conglomeration or accumulation during lithiation/delithiation reaction.