期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 16, 期 2, 页码 438-444出版社
ELSEVIER
DOI: 10.1016/S1003-6326(06)60075-7
关键词
lithium manganese oxide; Li2Mn2O4; phase transition; lithium-ion batteries
The phase transition of Li2Mn2O4 spinel at high temperature was investigated by XRD, TG/DTA, average oxidation state of Mn and cyclic voltammeric techniques. The results reveal that the Li2Mn2O4 spinel is unstable. At high temperature, it is easy to transform into [Li2-2x](tet)[Mn2-xLix](oct)O-4, which accompanies the formation of Li2MnO3 impurities. The phase transition is associated with the transfer of Li+ from tetrahedral 8a sites to octahedral 16d sites. With the increasing sintering temperature from 450 degrees C to 850 degrees C, the phase structure varies from lithiated-spinel Li2Mn2O4 to Li4Mn5O12-like to LiMn2O4-like and finally to rock-salt LiMnO2-like. In addition, a way of determining x with average oxidation state of Mn and the content of Li2MnO3 was also demonstrated.
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