Hydrothermal synthesis of three-dimensional hydrangea-like MoSe2@N-doped carbon anode material for high performance lithium ion batteries

Lithium-ion batteries have progressively taken the place of conventional power sources and been extensively employed in our daily lives. In this study, a simple hydrothermal method was adopted to develop the two-dimensional layered MoSe 2 into three-dimensional porous microspheres and nanosphere structures hydrangea-like via directional polymerization, self-assembly and Ostwald maturation. Subsequently, the dopamine hydrochloride was polymerized and carbonized to modify the curd-shaped MoSe 2 by N-doped carbon coating. The modified MoSe 2 @N-C anode material exhibited a larger specific capacity, better stability and a higher rate at high current density than MoSe 2 anode material. The modified negative electrode material achieved the specific capacity of 553 mAh/g at a current density of 1 A/g and 300.8 mAh/g at 10 A/g. Under high current density, the long-cycle charge-discharge performance test was performed, and the modified material exhibited a significantly large specific capacity and high stability performance. Its electrochemical performance was enhanced due to the N-doped carbon coating layer on the surface that increased the material conductivity and reduced the shuttle effect of polyselenide.