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The Li2FeSiO4cathode materialwas prepared via a solid state reaction method and subsequently heat treated at around 350°C and 700OC in Ar2atmosphere. High energy ball milling method is applied on the resulting powder with carbon additives to further modify the structure and to enhance the electrochemical performance. The structure and morphology of the prepared Li2FeSiO4powder was characterized by means of X-Ray Diffractometry (XRD) and Field-Emission Scanning Electron Microscope (FESEM). The morphological changes of the Li2FeSiO4resultedfrom different ball milling duration strongly influences the electrochemical performance of this cathode material.The Li2FeSiO4powder which was ball-milled for 48h delivered in the best electrochemical performance with a discharge capacity of 65.4 mAh/g when cycled between 1.5 and 4.8V vs. Li/Li+. Particulate morphology observed from FESEM images showed that samples that were ball-milled for 48h have reduced agglomeration compared to that ball-milled for 24h. The larger surface area for reaction with Li+improves the discharge capacity of the Li2FeSiO4cathode material.