Boron Doped Graphene Quantum Structure and MoS2 Nanohybrid as Anode Materials for Highly Reversible Lithium Storage

Abstract

Herein, the boron-doped graphene quantum structure (BGQS), which contains both the advantages of 0-D graphene quantum dot and 2-D reduced graphene oxide, has been fabricated by top-down hydrothermal method and then mixed with molybdenum sulfide (MoS₂) to serve as an active electrode material for the enhanced electrochemical performance of lithium ion battery. Results show that 30 wt% of BGQS/MoS₂ nanohybrid delivers the superior electrochemical performance in comparison with other BGQS/MoS₂ and bare components. A highly reversible capacity of 3,055 mAh g^-1 at a current density of 50 mA g^-1 is achieved for the initial discharge and a high reversible capacity of 1,041 mAh g^-1 is obtained at 100 mA g^-1 after 50 cycles. The improved electrochemical performance in BGQS/MoS₂ nanohybrid is attributed to the well exfoliated MoS₂ structures and the presence of BGQS, which can provide the vitally nano-dimensional contact for the enhanced electrochemical performance. Results obtained in this study clearly demonstrate that BGQS/MoS₂ is a promising material for lithium ion battery and can open a pathway to fabricate novel 2-D nanosheeted nanocomposites for highly reversible Li storage application.