M?ssbauer spectroscopy study of defects in hydrothermally synthesized LiFePO4 cathode material

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• 作者：K. M. ?. Jensen (1) <br> H. P. Gunnlaugsson (2) <br> M. Christensen (1) <br> B. B. Iversen (1) <br>
• 关键词：LiFePO4 ; M?ssbauer spectroscopy ; Defects
• 刊名：Hyperfine Interactions
• 出版年：2014
• 出版时间：April 2014
• 年：2014
• 卷：226
• 期：1-3
• 页码：73-78
• 全文大小：
• 参考文献：1. Padhi, A.K., Nanjundaswamy, K.S., Goodenough, J.: Phospho-olivines as positive-electrode materials for rechargeable lithium batteries. J. Electrochem. Soc. 144, 1188-194 (1997) blank" title="It opens in new window">CrossRef <br> 2. Chen, J.J., Vacchio, M.J., Wang, S.J., Chernova, N., Zavalij, P.Y., Whittingham, M.S.: The hydrothermal synthesis and characterization of olivines and related compounds for electrochemical applications. Solid State Ionics 178, 1676-693 (2008) blank" title="It opens in new window">CrossRef <br> 3. Islam, M.S., Driscoll, D.J., Fisher, C.A.J., Slater, P.R.: Atomic-scale investigation of defects, dopants, and lithium transport in the LiFePOb class="a-plus-plus">4b> olivine-type battery material. Chem. Mater. 17, 5085-092 (2005) blank" title="It opens in new window">CrossRef <br> 4. Chen, J.J., Whittingham, M.S.: Hydrothermal synthesis of lithium iron phosphate. Electrochem. Commun. 8, 855-58 (2006) blank" title="It opens in new window">CrossRef <br> 5. Jensen, K.M.?., Christensen, M., Gunnlaugsson, H.P., Lock, N., B?jesen, E.D., Proffen, T., Iversen, B.B.: Defects in hydrothermally synthesized LiFePOb class="a-plus-plus">4b> and LiFeb class="a-plus-plus">1?em class="a-plus-plus">x b>Mnb class="a-plus-plus"> / x b>POb class="a-plus-plus">4b> cathode materials. Chem. Mater. 25, 2282-290 (2013) blank" title="It opens in new window">CrossRef <br> 6. Gunnlaugsson, H.P.: A simple model to extract hyperfine interaction distributions from M?ssbauer spectra. Hyp. Int. 167, 851-54 (2006) blank" title="It opens in new window">CrossRef <br> 7. Bini, M., Ferrari, S., Capsoni, D., Mustarelli, P., Spina, G., Giallo, F.D., Lantieri, M., Leonelli, C., Rizzutie, A., Massarottia, V.: Pair distribution function analysis and M?ssbauer study of defects in microwave-hydrothermal LiFePOb class="a-plus-plus">4b>. RSC Advances 2, 250-58 (2012) blank" title="It opens in new window">CrossRef <br> 8. Andersson, A.S., Kalska, B., H?ggstr?m, L., Thomas, J.O.: Lithium extraction/insertion in LiFePOb class="a-plus-plus">4b>: an X-ray diffraction and M?ssbauer spectroscopy study. Solid State Ionics 130, 41-2 (2000) blank" title="It opens in new window">CrossRef <br> 9. Ellis, B., Kan, W.H., Makahnouk, W.R.M., Nazar, L.F.: Synthesis of nanocrystals and morphology control of hydrothermally prepared LiFePOb class="a-plus-plus">4b>. J. Mater. Chem. 17, 3248-254 (2007) b705443m" target="_blank" title="It opens in new window">CrossRef <br> 10. Chen, J., Bai, J., Chen, H., Graetz, J.: In situ hydrothermal synthesis of LiFePO4 studied by synchrotron X-ray diffraction. J. Phys. Chem. Lett. 2, 1874-878 (2011) blank" title="It opens in new window">CrossRef <br> 11. Jensen, K.M.?., Christensen, M., Tyrsted, C., Iversen, B.B.: Real-time synchrotron powder X-ray diffraction study of the antisite defect formation during sub- and supercritical synthesis of LiFePOb class="a-plus-plus">4b> and LiFeb class="a-plus-plus">1?em class="a-plus-plus">x b>Mnb class="a-plus-plus"> / x b>POb class="a-plus-plus">4b> nanoparticles. J. Appl. Crystallogr. 44, 287-94 (2011) blank" title="It opens in new window">CrossRef <br> 12. Mattievich, E., Danon, J.: Hydrothermal synthesis and M?ssbauer studies of ferrous phosphates of the homologous series Fe32+(PO4)2(H20) / n. J. Inorg. Nucl. Chem. 39, 569-80 (1977) blank" title="It opens in new window">CrossRef <br>
• 作者单位：K. M. ?. Jensen (1) <br> H. P. Gunnlaugsson (2) <br> M. Christensen (1) <br> B. B. Iversen (1) <br><br>1. Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK 8000, Aarhus C, Denmark <br> 2. Department of Physics and Astronomy, Aarhus University, DK-8000, Aarhus C, Denmark <br>
• ISSN：1572-9540

文摘

Hydrothermally synthesized LiFePO4b> has been prepared with different synthesis times in order to study defects in the crystal structure and their evolution. The M?ssbauer spectra can be interpreted as due to three components, Fe2+ in LiFePO4b>, Fe2+ in unreacted precursor material which resembles the M?ssbauer spectrum of Fe2+ in vivianite (Fe3b>(PO4b>)2b>·8H2b>O) and Fe3+. The Fe3+ contribution differs from room temperature oxidation of the precursor material, and can partly be due to charge compensating defects in the LiFePO4b> structure. With increasing synthesis time, the latter two contributions virtually disappear from the spectra.