Investigation of structural and electrical properties of (1 − x) Bi0.5Mg0.5TiO3–(x) PbTiO3 ceramic system |
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| Authors: | Radheshyam Rai Abinhav Sinha Seema Sharmac N.K.P. Sinha |
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| Affiliation: | aDepartment of Ceramics and Glass Engineering, University of Aveiro, Aveiro, Portugal;bDepartment of Electronics and Communication Engineering, National Institute of Technology Trichy, Trichy, India;cDepartment of Physics, A.N. College, Magadh University, Patna, India |
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| Abstract: | A 3 V cathode material for lithium ion batteries, Li0.33MnO2, was synthesized by solid-state reaction. Two Mn crystallographic positions, Mn(1) and Mn(2), were determined by X-ray diffraction analysis. The [Mn(2)O6] octahedron had a lower symmetrical degree than that of [Mn(1)O6], which was attributed to the geometrical effects of the non-symmetrical environment around Mn(2). Li0.33MnO2 delivered a reversible discharge capacity  140 mA h g−1. In situ synchrotron diffraction clearly showed a reversible phase transition of Li0.33MnO2 during electrochemical process. The analysis of X-ray absorption near edge spectroscopy observed the conversion of Mn4+ to Mn3+ with Li+ intercalation into Li0.33MnO2, accompanied by the formation of more severely distorted [MnO6] octahedron. |
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| Keywords: | Lithium battery Electrode materials Crystal structure Electronic property |
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