Abstract
The surface of spinel LiMn2O4 was modified with Fe2O3 (1.0, 2.0, 3.0, 4.0, and 5.0 wt%) by a simple sol-gel method to improve its electrochemical performance at room temperature. Compared with bare LiMn2O4, surface modification improved cycling stability of the material. Among the surface-modified cathode materials, the 3.0- and 4.0-wt% surface-modified cathodes have lesser capacity loss than the others. While the bare LiMn2O4 showed 25.4 % capacity loss in 70 cycles at room temperature, 3.0 and 4.0 wt% of Fe2O3-modified LiMn2O4 only exhibited the capacity loss of 2.6 and 2.3 % in 70 cycles at room temperature, respectively. The structure and phase were identified with X-ray diffractometer along with the lattice constant calculated by a Win-Metric program.
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Acknowledgments
This study was financially supported by the Research Foundation of Erciyes University (FBA-08-439) and International Post Doctoral Research Fellowship Programme (2219) of The Scientific and Technological Research Council of Turkey. The authors would like to thank Mr. İhsan Akşit for the SEM observation.
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Şahan, H., Dokan, F.K., Ülgen, A. et al. Improvement of cycling stability of LiMn2O4 cathode by Fe2O3 surface modification for Li-ion battery. Ionics 20, 323–333 (2014). https://doi.org/10.1007/s11581-013-0987-x
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DOI: https://doi.org/10.1007/s11581-013-0987-x