Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effect of Conductive Additives on the Structural and Electrochemical Properties of Li4Ti5O12 Spinel

  • Park, Jae-Hwan (Graduate School of Green Energy Technology, Chungnam National Uniersity) ;
  • Lee, Seongsu (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Kim, Sung-Soo (Graduate School of Green Energy Technology, Chungnam National Uniersity) ;
  • Kim, Jong-Huy (Korea Institute of Energy Research)
  • Received : 2012.08.31
  • Accepted : 2012.09.17
  • Published : 2012.12.20
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Abstract

The effect of a conductive agent on the structural and electrochemical properties of $Li_4Ti_5O_{12}$(LTO) spinel was investigated through neutron diffraction during Li intercalation and electrochemical measurements. The charging process of LTO is known as transformation of the white $(Li_3)_{8a}[LiTi_5]_{16d}O_{12}$ into a dark-colored $(Li_{3-X})_{8a}[Li_{X+Y}]_{16c}[LiTi_5]_{16d}O_{12}$ by incorporating the inserted Li into octahedral 16c sites, and the Li in tetrahedral 8a sites shifted to 16c sites. The occupancy of the tetrahedral 8a site varied with the existence of carbon in the electrode. Without carbon, the lattice parameter and cell volume of LTO decreased more notably than in the carbon-containing LTO electrode during Li insertion process. These phenomena might be attributed that the Li occupancy of the tetrahedral 8a of the LTO electrode without carbon was less than that of the carbon-containing LTO electrode.

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References

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