We have synthesized porous Li₂FeSiO₄/C nanocomposites by two different routes such as sol-gel (Li₂FeSiO₄/C-SG) and solvothermal (Li₂FeSiO₄/C-ST) using block copolymer pluronic (P123) as both in-situ carbon source and structure directing agent. Various techniques, like, powder x-ray diffraction, BET nitrogen adsorption–desorption measurement, scanning electron microscopy, transmission electron microscopy, galvanostatic cycling, cyclic voltammetry and electrochemical impedance spectroscopy were used to characterize the nanocomposites. A comparative study of their structural, electronic and electrochemical properties show that the solvothermally synthesized nanocomposite sample Li₂FeSiO₄/C-ST-600 (annealed at 600 °C) shows better electrochemical performance compared to the corresponding sol-gel synthesized (Li₂FeSiO₄/C-SG-600) sample. At a rate of C/30, Li₂FeSiO₄/C-ST-600 nanocomposite delivered a discharge capacity of ~276 mAhg⁻¹(84% of theoretical capacity) and also exhibited excellent stability at high rates. It retained 95% of its initial discharge capacity (140 mAhg ⁻¹ ) after 100 cycles at 1C, comparable to the recently published data on Mg-doped Li₂FeSiO₄/C composites. We attribute this enhanced electrochemical behavior of Li₂FeSiO₄/C-ST-600 due to the formation of porous nanocrystalline (~15 nm) composite material with a large BET surface area (~100 m²g⁻¹) resulting in a lower charge transfer resistance (~30Ω) and a higher Li-ion diffusion coefficient(~5 × 10−14cm²s⁻¹). The present study demonstrates that solvothermal synthesis of Li₂FeSiO₄/C nanocomposites using P123 as a carbon source is an effective method for improving its electrochemical properties.