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The fast charge of lithium-ion batteries (LIBs) needs anode and cathode materials operating at high current densities and thus require special consideration for the electrode materials. This work studies the effect of the loading ratio of Hard Carbon (HC) and Li₄Ti₅O₁₂ (LTO) on the electrochemical behavior of fast-charging LIBs. The formation of LTO/HC composites is confirmed with structural characterizations and electronic conductivity measurement. Galvanostatic charge–discharge cycling testing shows that superior cycling stability and specific capacity are achieved for the LTO/HC composite electrode with 20 wt% HC (LTO-HC20). Electrochemical impedance spectroscopy study reveals the improved lithium diffusion coefficient of LTO-HC compared to LTO only. Post-mortem analysis suggests that the LTO-HC composite electrodes, with an optimized LTO to HC ratio, can effectively contribute to improved Li-ion …