Spinel LiMn2O4 active material with high capacity retention |
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Authors: | Xifei Li |
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Institution: | Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, PR China |
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Abstract: | Heating the mixture of LiMn2O4 and NiO at 650 °C was employed to enhance the cyclability of spinel LiMn2O4. The results of scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy analyses implied that a LiNixMn2−xO4 solid solution was formed on the surface of LiMn2O4 particles. And charge-discharge tests showed that the enhancement of the capacity retention of modified LiMn2O4 is significant, maintained 97.2% of the maximum capacity after 100 cycles at charge and discharge rate of C/2, while the pure one only 75.2%. The modified LiMn2O4 also results in a distinct improvement in rate capability, even at the rate of 12C. The improvement of electrochemical cycling stability is greatly attributed to the suppression of Jahn-Teller distortion at the surface of spinel LiMn2O4 particles. |
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Keywords: | 71 20 Be (transition metals and alloys) |
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