Synthesis of graphene-wrapped ZnMn2O4 hollow microspheres as high performance anode materials for lithium ion batteries

Hollow microspheres of ZnMn2O4 wrapped by graphene have been successfully synthesized via a facile APS aided method. Characterization results certify that the reduced graphene sheets have been wrapped around the hollow ZnMn2O4 microspheres. Charge-discharge testing reveals that ZnMn2O4/RGO delivers superior electrochemical properties in terms of specific capacity, cycle stability (1082 mA h g(-1) at 100 mA g(-1) after 90 cycles) and high rate capability (580 mA h g(-1) at 1 A g(-1) after 150 cycles). The improved rate capability and cycling performance of the modified ZnMn2O4 microspheres are attributed to the incorporated RGO sheets' perfect synergy collaborating with the hollow structures, which can provide higher electronic conductivity, a shorter Li+ diffusion path and also buffer the volume change during Li+ insertion and extraction.