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 (MoSe 2 –CoSe 2 ). 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 MoSe 2 –CoSe 2 nanosheets can offer adequate specific capacity because of its high accessibility and multiple redox properties. As a result, the MoSe 2 –CoSe 2 /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.