Oxidation State of Manganese in LiMn2O4 Powders and Its Effect on Electrochemical Properties

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Lithium manganese oxide (LiMn2O4) powders for lithium ion batteries were synthesized from two separate raw material pairs, LiOH/MnO and LiOH/MnO2. The prepared powders and their electrochemical properties were investigated. Powders calcined at 780°C were composed of a single-phase spinel structure but those treated at 850°C showed a higher intensity ratio of I400 to I311, a slightly larger lattice parameter, and an increased discharge capacity by 10% under 3.0~4.3V voltage range. The XPS study on the oxidation states of manganese repealed that powders made from LiOH/MnO had less Mn3+ ion and gave better battery performances than those from LiOH/MnO2.

Info:

Periodical:

Materials Science Forum (Volumes 534-536)

Edited by:

Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim

Pages:

1473-1476

Citation:

S. H. Kim et al., "Oxidation State of Manganese in LiMn2O4 Powders and Its Effect on Electrochemical Properties", Materials Science Forum, Vols. 534-536, pp. 1473-1476, 2007

Online since:

January 2007

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$38.00

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