화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.22, No.4, 560-565, July, 2005
DOI10.1007/BF02706643  Export Citation
The Effects of Sulfur Doping on the Performance of O3-Li0.7[Li1/12Ni1/12Mn5/6]O2 Powder
Ki Soo Park, Myung Hun Cho, Sung Jang Jin, Chi Hoon Song, and Kee Suk Nahm†
  • School of Chemical Engineering and Technology, College of Engineering, Chonbuk National University, Chonju 561-756, Korea
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Li0.7[Li1/12Ni1/12Mn5/6]O2 and Li0.7[Li1/12Ni1/12Mn5/6]O2.ySy (y=0.1, 0.2, 0.3) powders were synthesized by using a sol-gel method. As-prepared samples showed typical rhombohedral O3 layered structure. The shape of the initial discharge curve for the samples was almost equal to that of the layered structure. However, the electrode materials were transferred from layered to spinel structures with cycling. At the first cycle, Li0.7[Li1/12Ni1/12Mn5/6]O2 and Li0.7[Li1/12Ni1/12 Mn5/6]O1.9S0.1, Li0.7[Li1/12Ni1/12Mn 5/6]O1.8S0.2, and Li0.7[Li1/12Ni1/12Mn5/6]O1.7S0.3 delivered the discharge capacities of 238, 230, 224, and 226 mAh/g, respectively, with their capacity fading rates of 0.34, 0.21, 0.12, 0.25%/cycle, respectively. The partial substitutions of Ni and S for Mn and O in Li0.7[Li1/12Ni1/12Mn5/6]O2 significantly enhanced the electrochemical properties of the lithium manganese oxide materials.
Keywords:Sol-gel Method;Ni Doping;Rhombohedral Structure;S-doping;Nanodomain
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