TY - JOUR
T1 - Novel synthesis process and structure refinements of Li4Mn5O12 for rechargeable lithium batteries
AU - Takada, Toshimi
AU - Hayakawa, Hiroshi
AU - Akiba, Etsuo
AU - Izumi, Fujio
AU - Chakoumakos, Bryan C.
N1 - Funding Information:
The authors would like to thank Mr A. Goto, Dr M. Yosh-ikawa, Hitachi, and Dr T. Horiba, Shin-Kobe Electric Machinery, for performing the electrochemical measurements. The neutron diffraction work was conducted at Oak Ridge National Laboratory which is managed by Lockheed Martin Energy Research for the US Department of Energy under contract no. DE-AC05-96OR22464.
PY - 1997/10
Y1 - 1997/10
N2 - Well-crystallized Li4Mn5O12 powder with grain size of 0.1-0.4 μm was prepared by heating a eutectic mixture of lithium acetate (LiOAc), and manganese nitrate (Mn(NO3)2), in an oxygen atmosphere. The structure of Li4Mn5O12 crystallites was found to be a cubic spinel using Rietveld refinement of both neutron and X-ray powder diffraction data. We confirmed that lithium ions occupy both the tetrahedral 8a sites, and part of the octahedral 16d sites, but not the 16c sites in the space group Fd3̄m, while all the manganese ions occupy the 16d sites. The lattice parameter was found to be sensitive to the synthesis temperature as a result of the variation in manganese valence. Samples prepared at 500 °C showed better electrode performance. A rechargeable capacity of about 135 mAh/g for the cell Li/Li4Mn5O12 was obtained in the 2.5-3.6 V range of cell voltages.
AB - Well-crystallized Li4Mn5O12 powder with grain size of 0.1-0.4 μm was prepared by heating a eutectic mixture of lithium acetate (LiOAc), and manganese nitrate (Mn(NO3)2), in an oxygen atmosphere. The structure of Li4Mn5O12 crystallites was found to be a cubic spinel using Rietveld refinement of both neutron and X-ray powder diffraction data. We confirmed that lithium ions occupy both the tetrahedral 8a sites, and part of the octahedral 16d sites, but not the 16c sites in the space group Fd3̄m, while all the manganese ions occupy the 16d sites. The lattice parameter was found to be sensitive to the synthesis temperature as a result of the variation in manganese valence. Samples prepared at 500 °C showed better electrode performance. A rechargeable capacity of about 135 mAh/g for the cell Li/Li4Mn5O12 was obtained in the 2.5-3.6 V range of cell voltages.
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U2 - 10.1016/S0378-7753(96)02570-0
DO - 10.1016/S0378-7753(96)02570-0
M3 - Article
AN - SCOPUS:0031247910
SN - 0378-7753
VL - 68
SP - 613
EP - 617
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 2
ER -
