Abstract
In order to enhance the rate capability as well as the cycleability at room temperature and elevated temperature, a special method to modify pure spinel LiMn2O4 was investigated. Both of pristine LiMn2O4 and modified-LiMn2O4 were characterized by XRD, SEM, EDAX and electrochemical techniques. XRD results showed that modified-LiMn2O4 did not change the basic LiMn2O4 structure. SEM and EDAX indicated that the thin LiNixMn2-xO4 solid solution layer was covered uniformly on the surface of modified-LiMn2O4. CV and charge- discharge tests at room temperature revealed that modified- LiMn2O4 had excellent cycle stability compared to pristine LiMn2O4, maintained 97.6% of the maximal discharge capacity after the 190 cycles, however, only 68.3% after 170 cycles for pristine LiMn2O4. In addition, modified-LiMn2O4 showed superior cycling performance at the elevated temperature and better rate capability than pristine LiMn2O4. The improving remarkably is attributed to that the solid solution layer reduces the dissolution of Mn cations and suppresses the Jahn- Teller distortion.
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