Sustainable Low-Temperature Coating of LATP/C Solid Electrolyte Composites on LiNi 1/3 Co 1/3 Mn 1/3 O 2 Cathode Based on Lithium Iodide Solvent-Recrystallization for Li-Ion Batteries

A mixed ionic (Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 : LATP) and electronic conductor (porous carbon: C) hybrid layer can effectively enhance the electrochemical performance of cathode materials. In this work, a sustainable low-temperature synthesis strategy (≤200 °C) combining ball milling and solvent-recrystallization of lithium iodide is first proposed to prepare the LATP/C coated LiNi 1/3 Co 1/3 Mn 1/3 O 2 (LNCMO) material. The characterizations of structures and morphology reveal that LATP and porous carbon powder are mixed into the ethanol dissolved lithium iodide by a simple ball milling process, then the lithium iodide is recrystallized to serve as a binder when ethanol is vaporized at a low temperature to coat uniform thickness and homogeneously distributed LATP/C on the surface of LNCMO cathode. The charge-discharge results illustrate that the cycling performance and rate discharge capability of the active materials coated with LATP/C are significantly superior to the bare LNCMO. AC impedance analysis confirms that lower charge transfer resistance and higher Li + ion diffusion coefficient are achieved in cathode materials. This work successfully exploited a novel low-temperature cathode coating method based on lithium iodide solvent-recrystallization and obtained results comparable to high-temperature processes without suffering from side reaction problems.