钇
材料科学
兴奋剂
结构精修
电化学
阴极
分析化学(期刊)
电池(电)
金属
离子
晶体结构
冶金
物理化学
结晶学
化学
电极
氧化物
光电子学
热力学
色谱法
功率(物理)
物理
有机化学
作者
Cansu Savaş Uygur,Mehmet Kadri Aydınol
标识
DOI:10.1016/j.mseb.2020.114925
摘要
The electrochemical performance of Li(Ni0.80Co0.15Al0.05)O2 (NCA) cathode was demonstrated to be improved by calcium and yttrium doping. Samples were synthesized by ultrasonic sound-assisted co-precipitation method which satisfied precipitation of nano-sized particles around 20 nm. Doping elements were introduced to the structure by solid-state reaction route and single phase, layered Li0.993(Ni0.804Co0.154Al0.035Y0.014)O2±σ and Li0.991(Ni0.801Co0.152Al0.037Ca0.019)O2±σ samples were successfully synthesized. Lattice parameters and site occupancy of the atoms were calculated by Rietveld refinement. Occupancy refinement of the atomic sites confirmed that doping elements occupied the transition metal layer as it was aimed. The presence of doping elements in the transition metal layer stabilized nickel and decreased the amount of cation mixing. Y-doped NCA sample exhibited the highest initial specific discharge capacity (157 mAh g−1) and Ca-doped sample showed the highest rate capability. Pristine NCA showed the lowest capacity, in any case, indicating the necessity of further treatment to achieve improvement in NCA cathode.
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