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Effects of Metal Ion Sources on Synthesis and Electrochemical Performance of Spinel LiMn2O4 Using Tartaric Acid Gel Process

✍ Scribed by Y.M. Hon; K.Z. Fung; S.P. Lin; M.H. Hon

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 288 KB
Volume: 163
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2001.9397

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✦ Synopsis

The e4ect of lithium and manganese ions on the synthesis, phase purity, and electrochemical properties of tartaric acid gel processed lithium manganese oxide spinel were investigated. The poor bonding between both lithium and manganese ions with tartaric acid was shown by the FT-IR analysis when lithium nitrate and/or manganese nitrate were used as sources. Li 2 MnO 3 and Mn 2 O 3 impurities formed in addition to lithium manganese oxides when nitrate salts were used as the sources. When acetate salts were used as sources for the lithium and manganese ions, single-phase LiMn 2 O 4 was obtained. These results indicate that homogeneous bonding between acetate salt and tartaric acid was formed. The capacity of single-phase LiMn 2 O 4 calcined at 5003C was 117 mAh/g which was much higher than those containing Mn 2 O 3 and Li 2 MnO 3 impurity compounds. Thus, sources of lithium and manganese ions play an important role in the synthesis and electrochemical behaviors of lithium manganese oxide spinel.

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