Soft XAS to expand the understanding on V-Doped lithium iron phosphate Rebekah Attard-Trevisan 1 , Ryan Parmenter 1 , Sally Pang 1 , Paul Thompson 2 , Ian D. Johnson 3 , Jawwad A. Darr 3 , Maria Alfredsson 1 1 School of Chemistry and Forensic Science, University of Kent, UK, 2 XMaS, UK-CRG, European Synchrotron Radiation Facility, France, 3 Faculty of Maths and Physical Sciences, University College London, UK Polyanionic compounds have been reported to exhibit higher capacities during battery cycling due to the enhanced induction effect in the polyanion.1 The enhanced capacity has been linked to an ancillary activity in the anion during battery cycling. Soft X-rays have been applied to elucidate the P K-edge of lithium iron phosphate (LFP) and its doped derivative at various states of charge (SOCs). The oxidation states on the phosphorus ions are found to couple to the iron redox activities, demonstrating that the polyanions contribute to the battery capacity. In addition, the local structure has been followed during battery cycling of doped LFP and linked to the creation of defects or strains caused by the introduction of the dopant cation.2 This study aims to give an insight to the effect of doping on the LFP crystal structure, as well as its cycling capability since quantifying the induction effect based on cation supervalent doping and stoichiometry will allow for the design of novel polyanionic cathode materials for applications in Li-ion batteries. References 1. Shu, X. Wang, Q. Wu, et al. (2013). J. Power Sources 237, 149-155. 2. Y. Chiang, H.C. Su, P. J. Wu, et al. (2012). J. Phys. Chem. C 116, 24424-24429. .
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