Facile hydrothermal synthesis and characterization of Co2GeO4/r-GO@C ternary nanocomposite as negative electrode for Li-ion batteries.
Ternary nanocomposite of Co2GeO4/r-GO@C is synthesized by single step hydrothermal method followed by calcination. The XRD analysis reveals the formation of cubic structured Co2GeO4and their corresponding functional groups identified through Raman analysis. The TEM analysis assures that uniform distribution of Co2GeO4nanoparticles on the r-GO layers. The Galvanostatic charge-discharge (GCD) curve demonstrates that the initial discharge capacity of pristine Co2GeO4, Co2GeO4/r-GO and Co2GeO4/r-GO@C composite is 1400, 1284 and 1594mAhg-1at 50mAg-1, respectively. The cycling stability curve shows the specific capacity of 609, 970 and 1180mAhg-1for pristine, Co2GeO4/r-GO and Co2GeO4/r-GO@C composite, respectively over 15 cycles. The ternary composite of Co2GeO4/r-GO@C delivers the discharge capacity of 323mAhg-1at high current density of 1Ag-1over 500 cycles with capacity retention of 71%. The rate capability curve indicates that Co2GeO4/r-GO@C composite shows the better rate capability.
Energy Storage and Conversion Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India. Electronic address: yuvarajphysics@gmail.com.
Yuvaraj
Y
Subramanian
Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada; Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
Karthikeyan
K
Kaliyappan
Energy Storage and Conversion Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India. Electronic address: selvankram@buc.edu.in.
Kalai Selvan
KS
Ramakrishnan
Co(2)GeO(4)/r-GO@C ternary composite; Cycling stability; Hydrothermal synthesis; Negative electrodes