Synthesis of almost stoichiometric nanosized cathode materials Li1-xNi1+xO2 by a combined method and study of their physical and electrochemical characteristics: microstructures

Cathode materials based on almost stoichiometric lithium nickelates have been synthesized. Samples were nanosized. The materials composition was Li0.98Ni1.02О2 (Sample 4) and Li0.79Ni1.21О2 (Sample 6). The sample 4 was synthesized at the following conditions: Li:Ni = 10:1; threatment temperature T=700C; treatment time t = 60 min. The sample 6 was synthesized at the following conditions: Li:Ni = 10:1; threatment temperature T=700C; treatment time t = 30 min. SEM images were obained by SEM LEO-420 scanning electron microscope (Carl Zeiss, Germany). The ScanMaster (National research nuclear university (MEPHI), Moscow Engineering Physics Institute, Russia) program was used for mathematical processing of images and calculation of grain sizes.

本研究合成了基于近化学计量比锂镍氧化物的正极材料，所制备样品均为纳米级尺寸。
两种样品的材料组分分别为Li₀.₉₈Ni₁.₀₂O₂（样品4）与Li₀.₇₉Ni₁.₂₁O₂（样品6）。
样品4的合成条件如下：锂镍摩尔比Li:Ni=10:1，热处理温度T=700℃，保温时间t=60分钟。
样品6的合成条件如下：锂镍摩尔比Li:Ni=10:1，热处理温度T=700℃，保温时间t=30分钟。
采用德国卡尔蔡司（Carl Zeiss）LEO-420型扫描电子显微镜（Scanning Electron Microscope，简称SEM）采集了样品的扫描电镜图像。
使用俄罗斯国家研究型核大学（MEPHI，莫斯科工程物理研究所）开发的ScanMaster程序完成了图像的数学处理与晶粒尺寸计算。