Enhanced electrochemical performance of LiMnBO3 with conductive glassy phase: a prospective cathode material for lithium-ion battery |
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| Authors: | V. Ragupathi M. Safiq P. Panigrahi T. Hussain S. Raman R. Ahuja G. S. Nagarajan |
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| Affiliation: | 1.Centre for Clean Energy and Nano Convergence,Hindustan Institute of Technology and Science,Chennai,India;2.Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy,Uppsala University,Uppsala,Sweden;3.Applied Materials Physics, Departments of Materials and Engineering,Royal Institute of Technology (KTH),Stockholm,Sweden;4.Nano Information Technology Academy (NITA),Dongguk University,Seoul,Republic of Korea |
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| Abstract: | LiMnBO3 has been identified as a promising cathode material for next-generation lithium-ion batteries. In this study, LiMnBO3 along with glassy lithium borate material (LiMnBO3 (II)) is synthesized by sol-gel method. X-ray diffraction (XRD) analysis depicts the existence of LiBO2 glassy phase along with m-LiMnBO3 phase. Transmission electron microscopy (TEM) analysis confirms the presence of LiBO2 glassy phase. An enhanced electrical conductivity of 3.64 × 10?7 S/cm is observed for LiMnBO3 (II). The LiBO2 glassy phase is found to promote the Li reaction kinetics in LiMnBO3 (II). The synthesized LiMnBO3 (II) delivers a first discharge capacity of 310 mAh g?1 within a potential window of 1.5–4.5 V at C/10 rate. Further, a discharge capacity of 186 mAh g?1 at the 27th cycle shows a better cycle performance. The enhanced capacity is due to the presence of LiBO2 glassy phase and more than one Li-ion transfer in the lithium-rich stoichiometry of LiMnBO3 (II). Density functional theory calculation reveals the exact electronic structure of m-LiMnBO3 with a band gap of 3.05 eV. A charge transfer mechanism is predicted for delithiation process of m-LiMnBO3. |
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