A facile solvothermal synthesis of Mn-doped LiFePO 4 nanoplates with improved electrochemical performances
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ORIGINAL PAPER
A facile solvothermal synthesis of Mn-doped LiFePO4 nanoplates with improved electrochemical performances Shiqi Guan 1 & Zhihai Hu 1 & Yan Dong 1 & Qing Chang 2 & Songdong Yuan 1 & Jian Xiong 1 & Guodong Jiang 1 Received: 30 May 2019 / Revised: 4 October 2019 / Accepted: 22 October 2019 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Using diethylene glycol as a solvent and manganese salts as doping sources, respectively, manganese doping and morphology control of olivine LiFePO4 as a cathode for Li-ion battery were simultaneously achieved by a facile solvothermal approach to alleviate the sluggish Li-ion diffusion kinetics. By the contrast to pure LiFePO4 nanoplates, the preferential growth of Mn-doped LiFePO4 particles was unchanged during the solvothermal synthesis procedure, and the plate morphology with a thickness of about 40 nm and a lateral size of 120–200 nm was kept, which was verified by XRD, SEM, and XPS characterizations. Moreover, it was demonstrated that the cell volume of as-synthesized LiFePO4 nanoplates with a reduced size along b-axial gradually was enlarged as the doping level of manganese increased. When assembled to a coin cell, electrochemical tests showed that Mn-doped LiFePO4 nanoplates delivered an excellent capacity of 165 mAh/g at a rate of 0.1 C, by comparison with pure LiFePO4 nanoplates with a capacity of 147 mAh/g1. Even at a high charging/discharging rate of 10 C, a capacity of 139 mAh/g was maintained. Additionally, Mn-doped LiFePO4 nanoplates also manifested a satisfactory cyclability with a capacity retention of 98.2% after 100 cycles at a rate of 10 C. The higher capacity, excellent rate capability, and cyclability of LiFePO4 were explained by the improved Li-ion intercalation/extraction kinetics and diffusion rate, as evidenced by cyclic voltammetry and electrochemical impedance spectroscopy, which was attributed to Mn doping and morphology tuning of LiFePO4. Keywords Solvothermal . Nanoplate . Doping . Lithium-iron phosphate . Li-ion battery
Introduction Lithium-ion battery (LIB) has been widely used as portable powers in modern life all over the world. In order to surmount the energy and environmental issues, there is an increasing demand for electric vehicle (EV), hybrid electric vehicle (HEV), and large-scale energy storage device etc., which has Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-019-03319-4) contains supplementary material, which is available to authorized users. * Songdong Yuan [email protected] * Guodong Jiang [email protected] 1
Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China
2
College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, China
put forward higher requirements on power density, energy density, as well as cycling life for LIB. [1] Olivinestructured lithium iron
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