▎ 摘　　要

Developing environmentally benign electrode materials with faster Li-ion kinetics is an essential requirement for high-performance Li-based energy storage devices. Here we report the large-scale synthesis of gamma-MnOOH-gra-phene (gamma-MnOOH-rGO) nanocomposite, through a simple hydrothermal route, for their application as potential anode material in Li-ion batteries. As-synthesized nanocomposite with the gamma-MnOOH nanorods uniformly anchored on the graphene sheets exhibits enhanced electrochemical performance and achieves a very high specific capacity of -435 mAh g(-1) at a current density of 1.0 A g(-1). Detailed electrochemical studies reveal faster Li-ion kinetics in gamma-MnOOH-rGO nanocomposite electrode, dominated by non-diffusion controlled processes (- 80% at 1.0 mV s(-1)). Further, the full-cell Li-ion capacitor fabricated with gamma-MnOOH-rGO nano composite as the anode and activated carbon as the cathode exhibits a maximum energy density of-51 Wh kg(-1) and a maximum power density of 6.3 kW kg(-1), with excellent capacity retention of more than -87% upon 8500 cycles. The present work thus demonstrates gamma-MnOOH-graphene nanocomposite as promising anode material for advanced Li-ion batteries and high power Li-ion capacitors.