Author/Authors :
Kyung Yoon Chung، نويسنده , , Won-Sub Yoon، نويسنده , , Hung Sui Lee، نويسنده , , Xiao-Qing Yang، نويسنده , , James McBreen، نويسنده , , B.H. Deng، نويسنده , , C.H. Zhang and X.Q. Wang، نويسنده , , M. Yoshio، نويسنده , , R. Wang، نويسنده , , J. Gui، نويسنده , , M. Okada and Y. Nakamura، نويسنده ,
Abstract :
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 °C) and low temperature (LT, −30 °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 °C under Ar atmosphere. The in situ XRD spectra collected during cycling at high temperature (HT, 55 °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.
Keywords :
Al-substitution , LiMn2O4 , In situ X-ray diffraction , Phase transition , Capacity fading
