Ultrasmall Li2S nanoparticles anchored in graphene nanosheets for high-energy lithium-ion batteries.

ABSTRACT: Li2S has a high theoretical capacity of 1166 mAh g(-1), but it suffers from limited rate and cycling performance. Herein we reported in-situ synthesis of thermally exfoliated graphene-Li2S (in-situ TG-Li2S) nanocomposite and its application as a superior cathode material alternative to sulfur. Li2S nanoparticles with the size of ~8.5 nm homogeneously anchored in graphene nanosheets were prepared via chemical reduction of pre-sublimed sulfur by lithium triethylborohydride (LiEt3BH). The in-situ TG-Li2S nanocomposite exhibited an initial capacity of 1119 mAh g(-1) Li2S (1609 mAh g(-1) S) with a negligible charged potential barrier in the first cycle. The discharge capacity retained 791 mAh g(-1) Li2S (1137 mAh g(-1) S) after 100 cycles at 0.1C and exceeded 560 mAh g(-1) Li2S (805 mAh g(-1) S

SUBMITTER: Zhang K 

PROVIDER: S-EPMC4174566 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature