Enhanced cycling performance of spinel LiMn2O4 coated with ZnMn2O4 shell
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ZnMn2O4 shell-coated LiMn2O4 was prepared by a simple routine that the mixture of LiMn2O4 and ZnO were heated at 750 °C. The structure and electrochemical performance of as-prepared powder compared with the pure LiMn2O4 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDAX), and galvanostatic charge–discharge testing, respectively. The results of XRD, SEM, and EDAX show that ZnMn2O4 is formed on the surface of LiMn2O4 particles. Charge–discharge testing reveals that ZnMn2O4 shell-coated LiMn2O4 greatly enhances the capacity retention of the spinel LiMn2O4. Furthermore, the modified LiMn2O4 shows significant enhancement in cycling stability at rates from 0.5 C to 12 C. It is found that the improved cycling performance and rate capability of the modified LiMn2O4 are attributed to the effective decrease of manganese dissolution from spinel structure because of ZnMn2O4 shell coated on the surface of LiMn2O4 particle.
KeywordsZnMn2O4 shell Capacity retention Rates capability Manganese dissolution
The authors wish to acknowledge the financial support of the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE, People’s Republic of China.