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Adipic Acid Assisted Sol-Gel Synthesis of Li1+x(Mn0.4Ni0.4Fe0.2)1-xO2 (0 < x < 0.3) as Cathode Materials for Lithium Ion Batteries

  • Karthikeyan, Kaliyappan (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Amaresh, Samuthirapandian (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Son, Ju-Nam (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Kim, Shin-Ho (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Kim, Min-Chul (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Kim, Kwang-Jin (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Lee, Sol-Nip (Faculty of Applied Chemical Engineering, Chonnam National University) ;
  • Lee, Yun-Sung (Faculty of Applied Chemical Engineering, Chonnam National University)
  • 투고 : 2012.08.27
  • 심사 : 2012.10.05
  • 발행 : 2013.01.20

초록

Layered $Li_{1+x}(Mn_{0.4}Ni_{0.4}Fe_{0.2})_{1-x}O_2$ (0 < x < 0.3) solid solutions were synthesized using solgel method with adipic acid as chelating agent. Structural and electrochemical properties of the prepared powders were examined by means of X-ray diffraction, Scanning electron microscopy and galvanostatic charge/discharge cycling. All powders had a phase-pure layered structure with $R\bar{3}m$ space group. The morphological studies confirmed that the size of the particles increased at higher x content. The charge-discharge profiles of the solid solution against lithium using 1 M $LiPF_6$ in EC/DMC as electrolyte revealed that the discharge capacity increases with increasing lithium content at the 3a sites. Among the cells, $Li_{1.2}(Mn_{0.32}Ni_{0.32}Fe_{0.16})O_2$ (x = 0.2)/$Li^+$ exhibits a good electrochemical property with maximum initial capacity of 160 $mAhg^{-1}$ between 2-4.5 V at 0.1 $mAcm^{-2}$ current density and the capacity retention after 25 cycles was 92%. Whereas, the cell fabricated with x = 0.3 sample showed continuous capacity fading due to the formation of spinel like structure during the subsequent cycling. The preparation of solid solutions based on $LiNiO_2-LiFeO_2-Li_2MnO_3$ has improved the properties of its end members.

키워드

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