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Rietveld Refinement of Oxysulfide $LiAl_{0.24}Mn_{1.76}O_{4-y}S_y (y=0, 0.02)$ Spinel Materials  

Park, Hyun-Min (New Materials Evaluation Center, Korea Research Institute of Standards and Science)
Y.K Cho (New Materials Evaluation Center, Korea Research Institute of Standards and Science)
Sun, Yang-Kook (Department of Industrial Chemistry, Hanyang University)
Publication Information
Korean Journal of Crystallography / v.14, no.2, 2003 , pp. 110-114 More about this Journal
Abstract
LiAl/sub 0.24/Mn/sub 1.76/O/sub 4-y/S/sub y/ (y=0, 0.02) were synthesized by the sol-gel method. Both structures were refined by Rietveld method, its structure refined as a cubic spinel, space group Fd-3m, a=8.17937(30) Å and 8.18331(19) Å respectively. Though it has been made a charge/discharge experiment above 20 times, there was no change of 3 V/4 V capacity degradation. It was considered that the volume change of MnO/sub 6/ octahedron induced by sulfur substitution plays a key role in keeping the 3 V/4 V capacity. The refined composition of the compound could be confirmed with the ICP analysis.
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