Hierarchical porous ZnMn sub(2) O sub(4) derived from cotton substance as high-performance lithium ion battery anode

Hierarchical porous ZnMn sub(2) O sub(4) has been prepared by an initial cotton template and subsequent calcination route. The as-prepared hierarchical porous ZnMn sub(2) O sub(4) composed of numerous nanoparticles well inherit the fibre-like structure of cotton, and these nanoparticles have a size of ~20-50 nm. The N sub(2) adsorption-desorption test indicates this ZnMn sub(2) O sub(4) has a Brunauer-Emmett-Teller surface area of ~16.7084 m super(2) g super(-1) and average pore size of ~27.0 nm. As lithium ion battery anodes, the ZnMn sub(2) O sub(4) can deliver a discharge capacity of 674.9 mAh g super(-1) after 200 cycles at current density of 200 mA g super(-1). Even at 1000 mA g super(-1), this ZnMn sub(2) O sub(4) still shows a stable discharge capacity of 541.5 mAh g super(-1). These promising electrochemical performances may be attributed to its unique hierarchical porous structure which helps to accelerate the ions transportation and elevate the structure stability.