Journal of Industrial and Engineering Chemistry

  • 제68권
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  • Pages.180-186
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  • 2018
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  • 1226-086X(pISSN)
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  • 1876-794X(eISSN)
한국공업화학회 (The Korean Society of Industrial and Engineering Chemistry)
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DOI QR코드

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Selective doping of Li-rich layered oxide cathode materials for high-stability rechargeable Li-ion batteries

  • Han, Dongwook (Department of Materials Science and Engineering, Hallym University) ;
  • Park, Kwangjin (Department of Mechanical Engineering, Gachon University) ;
  • Park, Jun-Ho (Energy Lab, Samsung Advanced Institute of Technology) ;
  • Yun, Dong-Jin (Analytical Science Lab, Samsung Advanced Institute of Technology) ;
  • Son, You-Hwan (Energy Lab, Samsung Advanced Institute of Technology)
  • 투고 : 2018.01.18
  • 심사 : 2018.07.26
  • 발행 : 2018.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

We report the discovery of Li-rich $Li_{1+x}[(Ni_{0.225}Co_{0.15}Mn_{0.625})_{1-y}V_y]O_2$ as a cathode material for rechargeable lithium-ion batteries in which a small amount of tetravalent vanadium ($V^{4+}$) is selectively and completely incorporated into the manganese sites in the lattice structure. The unwanted oxidation of vanadium to form a $V_2O_5-like$ secondary phase during high-temperature crystallization is prevented by uniformly dispersing the vanadium ions in coprecipitated $[(Ni_{0.225}Co_{0.15}Mn_{0.625})_{1-y}V_y](OH)_2$ particles. Upon doping with $V^{4+}$ ions, the initial discharge capacity (>$275mA\;h\;g^{-1}$), capacity retention, and voltage decay characteristics of the Li-rich layered oxides are improved significantly in comparison with those of the conventional undoped counterpart.

키워드

과제정보

연구 과제 주관 기관 : Hallym University, National Research Foundation of Korea (NRF)

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