MoSe2-CoSe2/N-doped graphene aerogel nanocomposites with high capacity and excellent stability for lithium-ion batteries

Bimetallic transition-metal selenides have emerged as promising anode materials for lithium-ion batteries (LIBs). However, they suffer from rapid capacity fading which is originated from significant chemical and mechanical degradation during lithiation/delithiation processes. Herein, nitrogen-doped graphene aerogel (NGA) with high porosity is prepared via a templated method and serves as the matrix for the uniform growth of sheet-like binary transition-metal selenides (MoSe2-CoSe2). The porous NGA with high specific surface area provides a stable and conductive network, which can accelerate electron transmission and shorten the diffusion distance of Li ions. Furthermore, the MoSe2-CoSe2 nanosheets can offer adequate specific capacity because of its high accessibility and multiple redox properties. As a result, the MoSe2-CoSe2/NGA-10 composite delivers high Li-ion storage capacity (1260 mAh g(-1) at 0.1 A g(-1)), excellent rate capability (702 mAh g(-1) at 5 A g(-1)), and stable cycling performance (914 mAh g(-1) at 1 A g(-1) after 200 cycles), demonstrating its great potential for LIB applications.