掺铝富锂材料Li_(1.2)Mn_(0.543)Co_(0.078)Ni_(0.155)Al_(0.030)O_2电极的电化学性能

Effect of Al-Doping in Li-Rich Material Li_(1.2)Mn_(0.543)Co_(0.078)Ni_(0.155)Al_(0.030)O_2 for Lithium-Ion Batteries

本文合成了掺铝富锂材料Li1.2Mn0.543Co0.078Ni0.155Al0.030O2,并使用扫描电镜(SEM)、粉末X射线衍射(XRD)、电感耦合等离子体原子发射光谱(ICP-AES)和拉曼散射光谱(Raman)等观察表征富锂和掺铝富锂材料.结果表明,共沉淀法合成掺铝富锂材料,具有R-3m空间群结构,Al元素进入晶格,未单独成相.电化学性能和非现场XRD测试结果表明,4%(by mole)掺铝富锂电极100周期循环容量保持率83.7%,Al元素掺杂有利于容量的释放,增强了电极富锂材料的结构稳定性,提高了循环性能.

The Al-doped 0.5Li2MnO3·0.5Li（Mno4Co0.2Ni04）O2 compounds were successfully synthesized as cathode materials for lithium-ion batteries. The pristine and Al-doped materials were characterized by scanning electron microscopy（SEM）, X-ray diffraction （XRD）, inductively coupled plasma-atomic emission spectrometry （ICP-AES） and laser Raman spectroscopy. The results indicated that all the prepared materials were indexed as a hexagonal structure with R-3m space group, and A1 element had been introduced into lattice. When cycled at 180 mA .g-1 （1 C-rate）, the capacity retention of 4% （by mole） Al-doped 0.5Li2MnO3. 0.5 Li（Mn0.4Co0.2Ni0.4）O2 electrode was as high as 83.7% after 100 cycles. The Al-doped materials could enhance the structural stability of electrodes, which contributes to high stabilized performance of cathode material for lithium ion batteries.