A Facile Synthesis of A Novel Cu₂Se@CMK-3 Nanocomposite for Rechargeable Sodium Batteries

The rechargeable sodium-ion battery has become a research hotspot due to low cost and a large abundance of sodium resources. In this work, a novel nano-architecture of Cu₂Se nanoparticles imbedded in ordered mesoporous carbon (Cu₂Se@ CMK-3) was synthesized. Benefiting from the high conductivity and special nano-architecture of CMK-3 matrix, the as-synthesized Cu₂Se@ CMK-3 composite delivers a high specific discharge capacity (231 mA h g⁻¹) and superior cycling stability (a capacity decay of 0.33% per cycle during 100 cycles at 0.1 C) when used as cathode in sodium-ion batteries. (paper)