Layered LiNi0.83Co0.11Mn0.06O2 cathode materials single- and dual-doped by the rare-earth elements Ce and Nd are successfully fabricated by using a coprecipitation-assisted solid-phase method. For comparison purposes, nondoping pristine LiNi0.83Co0.11Mn0.06O2 cathode material is also prepared using the same method. The crystal structure, morphology, and electrochemical performances are characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) mapping, and electrochemical techniques. The XRD data demonstrates that all prepared samples maintain a typical α-NaFeO2-layered structure with the R-3m space group, and that the doped samples with Ce and/or Nd have lower cation mixing than that of pristine samples without doping. The results of SEM and EDS show that doped elements are uniformly distributed in all samples. The electrochemical performances of all doped samples are better than those of pristine samples without doping. In addition, the Ce/Nd dualdoped cathode material shows the best cycling performance and the least capacity loss. At a 10 C-rate, the electrodes of Ce/Nd dual-doped cathode material exhibit good capacity retention of 72.7, 58.5, and 45.2% after 100, 200, and 300 cycles, respectively, compared to those of pristine samples without doping (24.4, 11.1, and 8.0%).

Abstract
 1. 서 론
 2. 실험방법
 3. 결과 및 고찰
 4. 결 론
 References

• 김유영(경남과학기술대학교 기계공학과) | Yoo-Young Kim (Dept. of Mechanical Engineering, Gyeongnam National University of Science and Technology)
• 하종근(경상대학교 그린에너지융합연구소) | Jong-Keun Ha (Research Institute for Green Energy Convergence Technology (RIGET), Gyeongsang National University)
• 조권구(경상대학교 나노신소재융합공학과 & 그린에너지융합연구소) | Kwon-Koo Cho (Dept. of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University) Corresponding Author