Tailoring particle size/morphology for the stable cathode performance of polygonal-shaped Li(Ni,Mn)2O4 single crystals

材料科学 形态学(生物学) 阴极 粒子(生态学) 粒径 结晶学 矿物学 化学工程 物理化学 化学 遗传学 海洋学 工程类 生物 地质学
作者
Minseuk Kim,Seulki Ji,Ho Jin Lee,Sun Sook Lee,Young‐Chul Song,Yongseon Kim,Sungho Choi
出处
期刊:Ceramics International [Elsevier BV]
卷期号:50 (20): 39212-39220
标识
DOI:10.1016/j.ceramint.2024.07.290
摘要

We regulate the particle size and crystallographic facet of single-crystal (SC) Li(Ni,Mn)2O4 (LNMO) cathode materials via flux-selective molten salt method. By simply adjusting Li2MoO4 or LiI as sintering aids, we synthesized size controlled SC particles, both small and large, and comparatively investigated their electrochemical behavior focusing on the lithiation/delithiation reactivity in conjunction with the particle size and surface planes. Considering the growth mechanism of a SC particles with a specific crystal plane, such particle size control is not determined solely by the synthetic condition but must also consider the interfacial energy of the crystal planes in conjunction with the fluxes what we used. While the initial charge capacity is similar, the given cathode using a small SC LNMO (using LiI) with uniform particle sizes (≤5 μm) exhibits outstanding rate capability with stable capacity retention under changing current density, which indicates 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 Li distribution by using laser-induced breakdown spectroscopy as a function of porosity change and cell degradation are thoroughly discussed from the standpoint of regulated particle property.
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