Template-free synthesis of mesoporous nanoring-like Zn-Co mixed oxides with high lithium storage performance

摘要

Mesoporous nanoring-like Zn-Co mixed oxides are synthesized via a simple template-free solvothermal method with a subsequent annealing process. The ring-like nanostructures with hollow interiors are formed under the complexing effects of potassium sodium tartrate. Numerous mesopores are generated after the precursor is annealed at 500 degrees C. When applied as anode materials, the mesoporous nanoring-like Zn-Co mixed oxides can deliver a high discharge capacity of 1102 mAh g(-1) after 200 cycles at 500 mA g(-1). Even when the current density is increased to 2 A g(-1), the mixed oxides can still retain a reversible capacity of 761 mAh g(-1). Such high cycling stability and rate capability are mainly derived from the unique mesoporous ring-like nanostructures and the synergistic effects between Zn and Co based oxides.