Conductive nanocarbons generally are used as the electronic conductive additives to contact with active materials to generate conductive network for electrodes of commercial Li-ion batteries (LIBs). In this work, conductive nanocarbons are systematically studied and classified as “hard” and “soft” conductive-carbons (named as HCC and SCC), respectively for the first time according to their structures and morphologies. SCC can create larger contact area with active particles of electrodes because it has more percentage of graphite-like (sp²) structures, smaller crystallite size and larger specific surface area than that of HCC. LiFePO₄ (LFP)，which has been widely used as cathode materials for EV LIBs with low electronic conductivity, need to contact with conductive network closely to depolarize for cathode electrodes. It is found that LiFePO₄ nano-crystals with large contact area wrapped in SCC networks perform significantly enhanced both capacity and charge-discharge rate capacity than that in HCC for the cathode of LIBs. Combined experiments with multiphysics simulation, the mechanism is investigated that LFP nanoparticles embedded with large contact areas enable to generate depolarization networks and enhance the electrochemical performance with a relatively uniform current density vector () and lithium flux vector (). This discovery will guide us to design LIBs with the high energy and power densities for electric vehicles (EVs) applications.