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Citation: LI Qi, QIAO Qing-Dong. Synthesis and Electrochemical Performance of Lithium Manganese Mixed Oxides[J]. Chinese Journal of Applied Chemistry, ;2003, 20(12): 1171-1175. shu

Synthesis and Electrochemical Performance of Lithium Manganese Mixed Oxides

LI Qi ,
QIAO Qing-Dong ^,

1.
Department of Applied Chemistry, Liaoning University of Petroleum and Chemical Technology, Fushun 113001

Corresponding author: QIAO Qing-Dong,
Received Date: 24 April 2003
Available Online: 30 August 2003
Fund Project: 辽宁省教育厅基金资助项目(202223203) (202223203)

The spinel lithium manganese mixed oxides(Li_1+xMn₂O₄) were prepared from lithium nitrate, manganese acetate and citric acid by a sol-gel method and studied by powder XRD, FTIR, TG-DTA, cyclic voltammetry and constant current charging-discharging technique. The doped amount of lithium has obvious influence on the structure, initial discharge capacity and cycling performance of the mixed oxide. The charge-discharge mechanism was analyzed. The XRD results revealed the lithium manganese oxides with excessive lithium has a spinel structure. The cell constants become small and the crystal was stable when the molar ratio of lithium to manganese was 1.05:2. Two redox peaks were recorded on the cyclic voltammograms of the spinel lithium manganese oxide. The oxide has high initial discharge capacity and good reversibility. The mixed oxide Li_1.05Mn₂O₄ has the highest capacity and cycling stability.
- lithium ion battery,
- lithium manganese oxide,
- spinel structure,
- electrochemical performances
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