MoSe2-CoSe2/N-doped graphene aerogel nanocomposites with high capacity and excellent stability for lithium-ion batteries
Abstract
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.
- Publication:
-
Journal of Power Sources
- Pub Date:
- November 2019
- DOI:
- 10.1016/j.jpowsour.2019.227112
- Bibcode:
- 2019JPS...43927112Z
- Keywords:
-
- Lithium-ion battery;
- MoSe<SUB>2</SUB>-CoSe<SUB>2</SUB>;
- Graphene aerogel;
- Nitrogen doping;
- Porous structure