Journal of Power Sources, Vol.146, No.1-2, 226-231, 2005
Comparative studies between oxygen-deficient LiMn2O4 and Al-doped LiMn2O4
Lithium-rich and Al-doped spinel materials with good capacity retention when cycled at high temperature have been synthesized. These materials have been studied in comparison with oxygen-deficient spinel using X-ray diffraction at room temperature (RT, 25 degrees C) and low temperature (LT, -30 degrees C). The XRD spectra at LT and RT showed that Al-doped spinel materials have superior structural stability against oxygen loss during heat treatment at 660 degrees C under Ar atmosphere. The in situ XRD spectra collected during cycling at high temperature (HT, 55 degrees C) showed that Al-doped spinel materials had better cycle performances and it was closely related to the structural stability against oxygen loss during charge-discharge cycling. Published by Elsevier B.V.