Jo Mi Ru, Kim Yong-Il, Kim Yunok, Chae Ji Su, Roh Kwang Chul, Yoon Won-Sub, Kang Yong-Mook
Department of Energy & Materials Engineering, Dongguk University, 100-715 Seoul (Korea).
ChemSusChem. 2014 Aug;7(8):2248-54. doi: 10.1002/cssc.201402109. Epub 2014 Jun 12.
The phase control of spinel LiNi0.5 Mn1.5 O4 was achieved through surface treatment that led to an enhancement of its electrochemical properties. Li(+) diffusion inside spinel LiNi0.5 Mn1.5 O4 could be promoted by modifying the surface structure of LiNi0.5 Mn1.5 O4 through phosphidation into a disordered phase (Fd3m) that allows facile Li(+) transport. Phosphidated LiNi0.5 Mn1.5 O4 showed a significantly enhanced electrochemical performance, even at high rates exceeding 10 C, demonstrating that the improved kinetics (related to the amount of Mn(3+) ) can render LiNi0.5 Mn1.5 O4 competitive as a high-power cathode material for electric vehicles and hybrid electric vehicles.
通过表面处理实现了尖晶石LiNi0.5Mn1.5O4的相控制，这使其电化学性能得到增强。通过磷化将LiNi0.5Mn1.5O4的表面结构改性为允许Li(+)轻松传输的无序相（Fd3m），可以促进Li(+)在尖晶石LiNi0.5Mn1.5O4内部的扩散。磷化的LiNi0.5Mn1.5O4即使在超过10 C的高倍率下也表现出显著增强的电化学性能，这表明改善的动力学（与Mn(3+)的量有关）可使LiNi0.5Mn1.5O4成为电动汽车和混合动力电动汽车的高功率正极材料具有竞争力。
