LiMn2-x Tix O4 spinel-type compounds (x=0.5, 0.8) have been synthesized by a modified sol-gel process. The structural stability of the spinels is significantly improved by the partial substitution of Mn(IV) with Ti(IV) on octahedral sites. Compared to obvious structural changes for LiMn2 O4, the spinel structure remains unchanged for LiMn1.2 Ti0.8O4 after a deep discharge. The average fading rate of LiMn1.2 Ti0.8 O 4 is ∼0.1% for 100 cycles, subtracting the initial capacity loss of 5%, which is mainly due to the formation of a solid electrolyte interphase layer. In addition, the capacity retention of 90% is achieved with the LiMn 1.2 Ti0.8 O4 electrode after 50 cycles between 2.0 and 4.8 V at 50°C. © 2009 The Electrochemical Society.
Spinel LiMn2-x Tix O4 (x=0.5, 0.8) with High capacity and enhanced cycling stability synthesized by a modified sol-gel method
Li J.;
2010-01-01
Abstract
LiMn2-x Tix O4 spinel-type compounds (x=0.5, 0.8) have been synthesized by a modified sol-gel process. The structural stability of the spinels is significantly improved by the partial substitution of Mn(IV) with Ti(IV) on octahedral sites. Compared to obvious structural changes for LiMn2 O4, the spinel structure remains unchanged for LiMn1.2 Ti0.8O4 after a deep discharge. The average fading rate of LiMn1.2 Ti0.8 O 4 is ∼0.1% for 100 cycles, subtracting the initial capacity loss of 5%, which is mainly due to the formation of a solid electrolyte interphase layer. In addition, the capacity retention of 90% is achieved with the LiMn 1.2 Ti0.8 O4 electrode after 50 cycles between 2.0 and 4.8 V at 50°C. © 2009 The Electrochemical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
