Seaweed-liked WS 2 /rGO enabling ultralong cycling life and enhanced rate capability for lithium-ion batteries

Abstract

WS 2 is considered as a potential anode material for lithium ion batteries (LIBs) with superior theoretical capacity and stable structure with two-dimensional which facilitates to the transportation and storage of lithium ion. Nevertheless, the commercial recognition of WS 2 has been impeded by the intrinsic properties of WS 2 , including poor electrical conductivity and large volume expansion. Herein, a seaweed-liked WS 2 /reduced graphene oxide (rGO) composites has been fabricated through a procedure involving the self-assembling of WO 42- , hexadecyl trimethyl ammonium ion with graphene oxide (GO) and the subsequent thermal treatment. The WS 2 /rGO nanocomposite exhibited the outstanding electrochemical property with a stable and remarkable capacity (507.7 mAh·g -1 ) at 1.0 A·g -1 even after 1000 cycles. This advanced electrochemical property is due to its seaweed-liked feature which can bring in plentiful active sites, ameliorate the stresses arisen from volume variations and increase charge transfer rate.