Ultrafast charge/discharge Li ₄ Ti ₅ O ₁₂ ||LiFePO ₄ full battery via regulating the microstructure of conducting network

Abstract Fast‐charging technology is indeed a critical technical problem for electric vehicles today. Improving the conductivity of electrode materials is one of the effective ways to solve this technical bottleneck. Here, we incorporated highly conductive MXene and carbon nanotubes into the electrode materials of Li 4 Ti 5 O 12 (LTO) and LiFePO 4 (LFP) to construct the composite electrode material 3D‐LTO‐CNT‐MXene and 3D‐LFP‐CNT‐MXene (named 3D‐LTO and 3D‐LFP). The 3D‐LTO we synthesized demonstrated an impressive capacity of 146.2 mAh g −1 at a 20C rate (where 1C = 175 mA g −1 ), the 3D‐LFP material exhibited a capacity of 104.6 mAh g −1 at a 20C rate (where 1C = 170 mA g −1 ). This remarkable rate capability can be attributed to the constructed three‐dimensional conductive network, which facilitates enhanced electrical conductivity and electron migration rates, thereby promoting rapid charging and discharging of the batteries. Furthermore, we assembled a 3D‐LTO||3D‐LFP full cell, which demonstrated exceptional performance at a high rate of 10C (1C = 170 mA g −1 ), achieving an energy density of 68.34 Wh kg −1 and a power density of 1547.5 W kg −1 . This work demonstrates the feasibility of constructing 3D highly conductive electrode materials for rapid charging and discharging at high rates. It paves the way for the commercial application of truly ultra‐fast charging in electric vehicles.