Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Single and Dual Doping of Rare Earth Metal Ce and Nd Elements on Electrochemical Properties of LiNi0.83 Co0.11Mn0.06O2Cathode Lithium-ion Battery Material

리튬이온전지용 양극활물질 LiNi0.83 Co0.11Mn0.06O2의 전기화학적 특성에 미치는 Ce와 Nd 희토류 금속의 단독 혹은 이중 도핑효과

  • Kim, Yoo-Young (Dept. of Mechanical Engineering, Gyeongnam National University of Science and Technology) ;
  • Ha, Jong-Keun (Research Institute for Green Energy Convergence Technology (RIGET), Gyeongsang National University) ;
  • Cho, Kwon-Koo (Dept. of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University)
  • 김유영 (경남과학기술대학교 기계공학과) ;
  • 하종근 (경상대학교 그린에너지융합연구소) ;
  • 조권구 (경상대학교 나노신소재융합공학과 & 그린에너지융합연구소)
  • Received : 2019.02.01
  • Accepted : 2019.02.18
  • Published : 2019.02.28
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Abstract

Layered $LiNi_{0.83}Co_{0.11}Mn_{0.06}O_2$ 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, non-doping pristine $LiNi_{0.83}Co_{0.11}Mn_{0.06}O_2$ 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 ${\alpha}-NaFeO_2$-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 dual-doped 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%).

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