“…The preparation of LiMn 2 O 4 as a nano-material with a certain morphology is a method that can effectively shorten the diffusion distance between lithium ions. 11 For example, it has been prepared as nanoparticles, 12 nanowires, 7 nanotubes, 13 nanorods, 14 nanospheres, 15 and so on. However, some nanomaterial shapes are complicated to prepare and may encounter some undesirable side reactions due to the high specic surface area in the operating environment of the batteries.…”