Abstract
We regulate the particle size and surface facet of single-crystal (SC) Li(Ni,Mn)2O4 cathode materials to give guidance without compromising electrochemical performance. Adjusting the molten salt method with selecting sintering aids , we synthesized size controlled SC particles, both small and large, and evaluated their electrochemical characteristics focusing on differences in the lithiation/delithiation reactivity depending on size with crystal facet conditions. While the initial charge capacity is similar to each other, the given cathode using an small SC particle with ordered crystalline and uniform particle sizes (≤5 um) exhibits outstanding rate capability with stable capacity retention irrespective of loading density and current density, which indicates the stable lithium transport during the repetitive electrochemical reactions. The dependency of the impedance response with change in the electrode resistances as well as the stability during the cycle reactions in conjunction with the post-mortem the Li distribution by using laser-induced breakdown spectroscopy as function of porosity change and cell degradation are thoroughly discussed from the standpoint of regulated particle property.
Published Version
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