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Charging and discharging lithium ion batteries (LIBs) in a matter of seconds to tens of seconds rather than hours can potentially lead to technological breakthroughs and bring about lifestyle changes. This work aims to enable ultrafast Li-ions charge/discharge ability for LIBs by significantly accelerating the diffusion kinetics of Li⁺ ions and enhancing the electric conductivity in LiFePO₄ cathode material. An innovative method was developed to synthesize LiFePO₄/C nanocomposite with secondary particles structure containing uniform (20–50 nm) and highly crystalline LiFePO₄ single nanoparticles which are free from any anti-site defects (e.g. Fe^·_Li) and uniformly coated by a highly graphitized carbon-shell network with good electronic conduction. The LiFePO₄/C material was formed from a FePO₄·xH₂O/poly(furfuryl alcohol) nanocomposite, which was prepared through a self-regulated in situ polymerization …