Suppression of Fe_Li Antisite Defects in Fluorine-Doped LiFePO₄

Authors

A. V. Radhamani, Indian Institute of Technology - Madras
C. Karthik, Boise State UniversityFollow
Rick Ubic, Boise State UniversityFollow
M. S. Ramachandra Rao, Indian Institute of Technology - Madras
C. Sudakar, Indian Institute of Technology - Madras

Document Type

Article

Publication Date

7-1-2013

Abstract

We report on the suppression of Fe_Li antisite defects in LiFe(PO₄)_1−xF_3x with 0 ⩽ x ⩽ 0.4 prepared by sol–gel and hydrothermal methods. Evidence for a systematic suppression of antisite defects upon fluorine doping in LiFePO₄ is inferred from Fourier transform infrared spectra, wherein a noticeable red shift in the symmetric P–O stretching vibrational mode of (PO₄)³⁻ polyanion from 970 to 957 cm⁻¹ was observed. We report detailed structural and compositional studies of LiFe(PO₄)_1−xF_3x, and discuss the implications for the performance of LiFePO₄ cathodes in lithium ion batteries.

Publication Information

Radhamani, A. V.; Karthik, C.; Ubic, Rick; Rao, M. S. Ramachandra; and Sudakar, C.. (2013). "Suppression of Fe_Li Antisite Defects in Fluorine-Doped LiFePO₄". Scripta Materialia, 69(1), 96-99. https://doi.org/10.1016/j.scriptamat.2013.02.015