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Acta Phys. -Chim. Sin.  2000, Vol. 16 Issue (08): 735-740    DOI: 10.3866/PKU.WHXB20000812
Article     
Lithiation Behavior of α-Fe2O3 in LiOH Electrolyte Solution
Li Ming, Yang Hua-Quan
Department of Chemistry,Peking University,Beijing 100871
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Abstract  

The lithiation behavior of a-Fe_2O_3, is investigated at ambient-temperature in LiOH solutions by methods of cyclic voltammetry, IR and tracking XRD and ICP analyses. The results reveal that lithiation can take place to a small extent in α-Fe_2O_3 and its electrochemically synthesized product is Fe_3O_4 but lithiation process is limited by the unavoidable extrusion of iron in alkaline solutions. It is suggested that Li+ intercalation promotes iron's extrusion from α-Fe_2O_3 and Fe_3O_4, and that a coordination effect occurs between lithiation and iron extrusion, which shortens the steps of cyclic curves and improves the capacity significantly. These results are compared with experiments, in which α-Fe_2O_3 electrodes cycled in KOH solutions are tested by CV, XRD and ICP.



Key wordsα-Fe2O3      Fe3O4      Aqueous secondary lithium batteries      Ni-Fe batteries     
Received: 23 December 1999      Published: 15 August 2000
Corresponding Authors: Yang Hua-Quan   
Cite this article:

Li Ming, Yang Hua-Quan. Lithiation Behavior of α-Fe2O3 in LiOH Electrolyte Solution. Acta Phys. -Chim. Sin., 2000, 16(08): 735-740.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20000812     OR     http://www.whxb.pku.edu.cn/Y2000/V16/I08/735

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