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Batteries 2016, 2(2), 18; doi:10.3390/batteries2020018

The Carbon Additive Effect on Electrochemical Performance of LiFe0.5Mn0.5PO4/C Composites by a Simple Solid-State Method for Lithium Ion Batteries

1
Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 243, Taiwan
2
Battery Research Center of Green Energy, Ming Chi University of Technology, New Taipei City 243, Taiwan
3
Department of Chemical and Materials Engineering and Green Technology Research Center, Chang Gung University, Kwei-shan, Taoyuan 333, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Maciej Swierczynski
Received: 28 April 2016 / Revised: 25 May 2016 / Accepted: 7 June 2016 / Published: 15 June 2016
(This article belongs to the Special Issue Lithium Ion Batteries)
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Abstract

This work reported a solid-state method to prepare LiFe0.5Mn0.5PO4/C (LFMP/C) composite cathode materials by using LiH2PO4, MnO2, Fe2O3, citric acid (C6H8O7), and sucrose (C12H22O11). The citric acid was used as a complex agent and C12H22O11 was used as a carbon source. Two novel hollow carbon sphere (HCS) and nanoporous graphene (NP-GNS) additives were added into the LFMP/C composite to enhance electrochemical performance. The HCS and NP-GNS were prepared via a simple hydrothermal process. The characteristic properties of the composite cathode materials were examined by micro-Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental analysis (EA), and alternating current (AC) impedance methods. The coin cell was used to investigate the electrochemical performance at various rates. It was found that the specific discharge capacities of LFMP/C + 2% NP-GNS + 2% HCS composite cathode materials were 161.18, 154.71, 148.82, and 120.00 mAh·g−1 at 0.1C, 0.2C, 1C, and 10C rates, respectively. Moreover, they all showed the coulombic efficiency ca. 97%–98%. The advantage of the one-pot solid-state method can be easily scaled up for mass-production, as compared with the sol-gel method or hydrothermal method. Apparently, the LFMP/C composite with HCS and NP-GNS conductors can be a good candidate for high-power Li-ion battery applications. View Full-Text
Keywords: LiFe0.5Mn0.5PO4 (LFMP); Fe2O3; MnO2; specific capacity; cathode materials; solid-state method LiFe0.5Mn0.5PO4 (LFMP); Fe2O3; MnO2; specific capacity; cathode materials; solid-state method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yang, C.-C.; Hung, Y.-W.; Lue, S.J. The Carbon Additive Effect on Electrochemical Performance of LiFe0.5Mn0.5PO4/C Composites by a Simple Solid-State Method for Lithium Ion Batteries. Batteries 2016, 2, 18.

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