One step construction of Mesh-like CoSe2 microflowers for magnesium-lithium hybrid batteries with enhanced rate performance

Abstract

Magnesium-lithium hybrid-ion batteries are a potential energy storage device possessing fast ion migration kinetics and high safety. The CoSe2 were prepared using one-step solvothermal preparation of mesh-like microflowers, which can provide shorter paths for ion diffusion and can provide buffer space for volume changes during electrochemical reactions. The discharge specific capacity is maintained of 361.9 mAh g-1 after 500 cycles at 1 A g-1. In addition, it has high rate performance with 452.0 mAh g-1 discharge capacity at 0.2 A g-1, and has 332.0 mAh g-1 discharge capacity at 2 A g-1. This work confirms that CoSe₂ is an appropriate cathode material for high performance Magnesium-lithium hybrid-ion batteries.