Mental-organic framework derived CuO hollow spheres as high performance anodes for sodium ion battery

Hollow cupric oxide (CuO) spheres are successfully prepared via annealing a mental-organic framework precursor (HKUST-1). As novel anode materials for sodium ion batteries, the as-prepared CuO delivers high initial reversible capacity of 612 mAh g−1 and good capacity retention of 83% after 50 cycles with superior rate capability.