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Mg-Ti co-doping behavior of porous LiFePO4 microspheres for high-rate lithium-ion batteries

Abstract

The promise of fast-charging lithium-ion batteries (LIBs) is an urgent necessity. Nevertheless, it is still a huge challenge to prepare superior high-rate cathode materials for LIBs. In this work, the porous Mg-Ti co-doped LiFe0.985Mg0.005Ti0.01PO4 microspheres are successfully synthesized via carbothermic reduction reaction in combination with spray drying process, with FePO4 as Fe and P source. Combining X-ray diffraction (XRD) with X-ray photoelectron spectroscopy (XPS) Ar+-sputtering technology, it confirms that Mg and Ti are in the form of doping rather than surface recombination inside LiFePO4 microspheres, and the existence of Fe3+ inside the samples is confirmed as residual FePO4. Compared to the undoped sample, the porous Mg-Ti co-doped LiFePO4 microspheres have a great improvement of electronic conductivity (1.58×10-3 S cm-1) and diffusion coefficient (5.97×10-9 cm s-1 for charging and 4.30×10-9 cm s-1 for discharging). More importantly, the porous Mg-Ti co-doped LiFe0.985Mg0.005Ti0.01PO4 microspheres show excellent high-rate capabilities, delivering a discharge capacity of 161.5, 160.3, 156.7, 147.5, 139.8 and 131.5 mAh g-1 at 0.2 C, 0.5 C, 1 C, 3 C, 5 C and 8 C, respectively.

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Publication details

The article was received on 21 May 2017, accepted on 14 Jul 2017 and first published on 14 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04426G
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Mg-Ti co-doping behavior of porous LiFePO4 microspheres for high-rate lithium-ion batteries

    J. Tu, K. Wu, H. Tang, H. Zhou and S. Jiao, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04426G

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