Novel approach to preparation of LiMn2O4 core/LiNixMn2−xO4 shell composite |
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Authors: | Xifei Li Youlong Xu Chunlei Wang |
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Institution: | a Electronic Materials Research Laboratory, Key laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, PR China b Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33174, USA |
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Abstract: | Combining two methods, coating and doping, to modify spinel LiMn2O4, is a novel approach we used to synthesize active material. First we coated the LiMn2O4 particles with the nickel oxide particles by means of homogenous precipitation, and then the nickel oxide-coated LiMn2O4 was calcined at 750 °C to form a LiNixMn2−xO4 shell on the surface of spinel LiMn2O4 particles. Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), cyclic voltammetry (CV) and charge-discharge test were performed to characterize the spinel LiMn2O4 before and after modification. The experimental results indicated that a spinel LiMn2O4 core is surrounded by a LiNixMn2−xO4 shell. The resulting composite showed excellent electrochemical cycling performance with an average fading rate of 0.014% per cycle. This improved cycle stability is greatly attributed to the suppression of Jahn-Teller distortion on the surface of spinel LiMn2O4 particles during cycling. |
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Keywords: | Spinel LiMn2O4 Core Shell Jahn-Teller distortion |
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