Superior lithium storage in Li 2 MnSiO 4 cathodes was observed by altering carbon content during the formulation of electrodes. Initially, Li 2 MnSiO 4 was prepared by a conventional solid-state reaction at 900 C under Ar flow with a fixed amount of adipic acid, which acts as a gelating agent during synthesis. The phase formation was confirmed through powder X-ray diffraction measurements. Scanning electron microscope pictures indicate the particulate morphology of synthesized Li 2 MnSiO 4 particles. Various compositions of electrodes were formulated using the conducting carbon (ketjen black) from 3 to 11 mg along with active material. All the fabricated electrodes were cycled in a Li/Li 2 MnSiO 4 cell configuration to evaluate its lithium storage performance at 0.05 C rate. Among the electrodes, 42% carbon in the composite electrode exhibited a very stable discharge behaviour $140 mA h g À1 for 40 cycles at room temperature. Such storage performance was ascribed to the improved electronic conductivity of Li 2 MnSiO 4 electrodes by incorporating carbon. This improvement was supported by electrochemical impedance spectroscopy measurements. Rate performance studies were also conducted and presented in the manuscript.

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