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Title of Journal: J Solid State Electrochem

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Abbravation: Journal of Solid State Electrochemistry

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Springer Berlin Heidelberg

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DOI

10.1016/0378-5963(82)90108-8

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1433-0768

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A facile method to prepare biphase lithium vanada

Authors: Jichao Wang Guohua Gao Xiaowei Zhou Jiandong Wu Huiyu Yang Qiang Li Guangming Wu
Publish Date: 2014/05/15
Volume: 18, Issue: 9, Pages: 2459-2467
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Abstract

Bicrystal lithium vanadate is synthesized with starting materials of V2O5 and LiF by onestep solidstate reaction Since fluorine reacts with crucible made of silica Li03V2O5liked and LiV3O8liked phases without F coexist in the produces The stoichiometric proportion of two phases depends on the amount of dopant LiF These are confirmed by Xray diffraction XRD Fourier transform infrared FTIR and transmission electron microscopy TEM Charge and discharge curves of bicrystal materials present better reversibility of voltage plateaus than that of pure V2O5 The initial discharge capacity of Li03V2O5liked phase dominated bicrystal material is higher than pure V2O5 LiV3O8liked phase dominated bicrystal material has lower initial discharge capacity but delivers better cycling performance Electrochemical impedance spectroscopy EIS measurements are performed to evaluate electrochemical kinetics of the bicrystal materials The results indicate that bicrystal phase benefit the transfer resistance interior diffusion resistance and structure stability Cathodes with different biphase structures have variable charge transfer resistance and lithiumion diffusion speed due to this special structureThe authors gratefully acknowledge the financial support by the National Natural Science Foundation of China grant numbers 51272179 51102183 Shanghai Committee of Science and Technology 11 nm0501300 13JC1408700 and National hightech RD program of china 863 program grant no2013AA031801

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