Morphology Control of Free‐Standing LiFePO4‐Based Composite Membranes for Advanced Lithium‐Ion Battery Cathodes

High conductivity, facilitating rapid electron transport and ion diffusion, is necessary for high‐performance lithium‐ion battery cathodes. At a given electrode formula, it is critical to tailor the distribution of conductive agents in the cathodes to achieve a highly conductive network.Herein, free‐standing LiFePO 4 ‐based composite membranes with a high conductivity of 2.55 S cm −1 are obtained by adding alcohol in the aqueous slurry. The composite membranes have superior rate capability and a specific capacity of about 116 and 105 mAhg −1 is achieved at 5 C for a LiFePO 4 mass loading of about 6 and 10 mg cm −2 , respectively. Furthermore, a specific capacity is retained as 137.2 mAhg −1 after 300 cycles at 1 C, corresponding to excellent long‐term cyclic stability of the composite membranes.