Effects of titanium incorporation on phase and electrochemical performance in LiFePO4 cathode material

► Nominal LiFe1−xTixPO4 cathode materials were synthesized via solid-state reaction. ► A clear feature of Ti-doped LiFePO4 has been clarified. ► The formation of impurity phases strongly depends on Ti doping level. ► Appropriate amount of Ti in LiFePO4 can enhance the electrochemical performance. Ti...

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Veröffentlicht in:Electrochimica acta 2012-09, Vol.78, p.576-584
Hauptverfasser: Wang, Zhao-Hui, Pang, Quan-Quan, Deng, Ke-Jian, Yuan, Li-Xia, Huang, Fei, Peng, Yun-Long, Huang, Yun-Hui
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container_issue
container_start_page 576
container_title Electrochimica acta
container_volume 78
creator Wang, Zhao-Hui
Pang, Quan-Quan
Deng, Ke-Jian
Yuan, Li-Xia
Huang, Fei
Peng, Yun-Long
Huang, Yun-Hui
description ► Nominal LiFe1−xTixPO4 cathode materials were synthesized via solid-state reaction. ► A clear feature of Ti-doped LiFePO4 has been clarified. ► The formation of impurity phases strongly depends on Ti doping level. ► Appropriate amount of Ti in LiFePO4 can enhance the electrochemical performance. Ti-incorporated LiFe1−xTixPO4 (0≤x≤0.2) samples have been prepared via a two-step solid-state reaction route. The samples have systematically been investigated with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscope (SEM), transmission electron microscope (TEM), cyclic voltammetry (CV) and charge/discharge measurements. The incorporation of Ti in LiFePO4 significantly enhances the electrochemical performance; the carbon-coated LiFe0.9Ti0.1PO4 sample shows the best performance. It is confirmed that LiFe1−xTixPO4 with x≤0.05 are of single phase while those with 0.07≤x≤0.2 contain impurity phases: LiTi2(PO4)3 and TiP2O7. The impurities influence not only the electronic conductivity, but also the total specific capacity. Appropriate amount of titanium incorporation is favorable for the improvement in electrochemical performance.
doi_str_mv 10.1016/j.electacta.2012.06.067
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Ti-incorporated LiFe1−xTixPO4 (0≤x≤0.2) samples have been prepared via a two-step solid-state reaction route. The samples have systematically been investigated with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscope (SEM), transmission electron microscope (TEM), cyclic voltammetry (CV) and charge/discharge measurements. The incorporation of Ti in LiFePO4 significantly enhances the electrochemical performance; the carbon-coated LiFe0.9Ti0.1PO4 sample shows the best performance. It is confirmed that LiFe1−xTixPO4 with x≤0.05 are of single phase while those with 0.07≤x≤0.2 contain impurity phases: LiTi2(PO4)3 and TiP2O7. The impurities influence not only the electronic conductivity, but also the total specific capacity. 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Ti-incorporated LiFe1−xTixPO4 (0≤x≤0.2) samples have been prepared via a two-step solid-state reaction route. The samples have systematically been investigated with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscope (SEM), transmission electron microscope (TEM), cyclic voltammetry (CV) and charge/discharge measurements. The incorporation of Ti in LiFePO4 significantly enhances the electrochemical performance; the carbon-coated LiFe0.9Ti0.1PO4 sample shows the best performance. It is confirmed that LiFe1−xTixPO4 with x≤0.05 are of single phase while those with 0.07≤x≤0.2 contain impurity phases: LiTi2(PO4)3 and TiP2O7. The impurities influence not only the electronic conductivity, but also the total specific capacity. 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Ti-incorporated LiFe1−xTixPO4 (0≤x≤0.2) samples have been prepared via a two-step solid-state reaction route. The samples have systematically been investigated with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscope (SEM), transmission electron microscope (TEM), cyclic voltammetry (CV) and charge/discharge measurements. The incorporation of Ti in LiFePO4 significantly enhances the electrochemical performance; the carbon-coated LiFe0.9Ti0.1PO4 sample shows the best performance. It is confirmed that LiFe1−xTixPO4 with x≤0.05 are of single phase while those with 0.07≤x≤0.2 contain impurity phases: LiTi2(PO4)3 and TiP2O7. The impurities influence not only the electronic conductivity, but also the total specific capacity. Appropriate amount of titanium incorporation is favorable for the improvement in electrochemical performance.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.electacta.2012.06.067</doi><tpages>9</tpages></addata></record>
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subjects Cathode
Diffraction
Electrochemical performance
Impurities
Lithium iron phosphate
Lithium-ion batteries
Performance enhancement
Phase (cyclic)
Scanning electron microscopy
Titanium
Titanium incorporation
X-ray photoelectron spectroscopy
X-rays
title Effects of titanium incorporation on phase and electrochemical performance in LiFePO4 cathode material
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