Hierarchical porous Co3O4 spheres fabricated by modified solvothermal method as anode material in Li-ion batteries
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Hunan Provincial Key Laboratory of Electronic Packaging and Advanced Functional Materials, Changsha 410083, China;
3. School of Metallurgy and Environment, Central South University, Changsha 410083, China)
2. Hunan Provincial Key Laboratory of Electronic Packaging and Advanced Functional Materials, Changsha 410083, China;
3. School of Metallurgy and Environment, Central South University, Changsha 410083, China)
Abstract: Hierarchical porous Co3O4 spheres were synthesized by a solvothermal method followed by high-temperature calcination. XRD, SEM, TEM and electrochemical tests were used to study the structure and performance of the hierarchical porous Co3O4 spheres. The results show that the Co3O4 synthesized at a calcination temperature of 700 °C (Co3O4-700) is micro-sized spheres (1-2 μm) consisting of plentiful nanoparticles (50-200 nm) and numerous pores (~100 nm). Due to its numerous porous morphology, the Co3O4-700 anode exhibits the highest cycling performance with excellent reversible discharge and charge specific capacities of 745 and 755 mA·h/g at the current density of 100 mA/g after 100 charge-discharge cycles, respectively.
Key words: Co3O4; lithium-ion batteries; porous structure; spheres; calcination