To improve the electrochemical performance of Co3O4/graphene composites towards high-performance lithium ion batteries, various facile chemical methods have been developed to form hybrid Co3O4/graphene composites, but the compositions of these composites were considerably different. In this study, a two-step solvothermal synthesis method was employed to accurately control the concentration of Co3O4 nanoparticles (NPs) with particle sizes less than 10 nm in the composite. The Co3O4/reduced graphene oxide (RGO) composites exhibited the highest reversible capacity of 1600 mAh g−1 at 43 wt% Co3O4 NPs. The synergic effects of the sub-10-nm sized Co3O4 and the RGO sheets resulted in improved reversible capacity, cycling stability, and rate capability, which are caused by a large number of active sites and the short diffusion pathways provided by the nano-sized Co3O4, as well as the elastic buffer space and conductive pathway provided by the RGO sheets.
Bibliographical noteFunding Information:
This work was supported by Korea Electric Power Corporation through Korea Electrical Engineering & Science Research Institute ( R15XA03-20 ), Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( 2013R1A1A1011215 ), the 2nd phase of the Fundamental R&D Programs for Core Technology of Materials funded by Ministry of Trade, Industry and Energy (2015–2016), Plant Research Program funded by Ministry of Land, Infrastructure and Transport ( 14IFIP-C071144-02 ), and the Korea Research Institute of Chemical Technology (KRICT).
© 2016 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering