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Improvement of the electrochemical performance of LiFePO4 cathode by Y-doping

Published online by Cambridge University Press:  17 August 2017

F. Herrera ,
F. Fuenzalida ,
P. Marquez  and
J. L. Gautier
F. Herrera*
Affiliation:
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. L.B.O'Higgins 3363, Santiago, Chile
F. Fuenzalida
Affiliation:
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. L.B.O'Higgins 3363, Santiago, Chile
P. Marquez
Affiliation:
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. L.B.O'Higgins 3363, Santiago, Chile
J. L. Gautier
Affiliation:
Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. L.B.O'Higgins 3363, Santiago, Chile
*
Address all correspondence to F. Herrera at francisco.herrerad@usach.cl
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Abstract

LiFe1−xYxPO4 doped (d-LFP) with amounts of yttrium (0.01% < x < 5% w/w) show a remarkable effect on the electrochemical behavior. The d-LPF samples were investigated on the Li extraction/insertion performance through charge/discharge and capacity–voltage curves. The best performance was attained with Y content of x = 1%. The materials were synthesized by a hydrothermal method and characterized by x-ray diffraction (XRD) and scanning electron microscopy–energy dispersive x-ray spectroscopy (SEM–EDX). The XRD studies showed that d-LPF had the same monoclinic structure as the undoped material. The achieved electrode performance has been attributed to the addition of Y3+ ion by stabilizing the orthorhomic structure. The electrode resistance decreases through the Y-doping.

Type
Prospective Articles
Information
MRS Communications , Volume 7 , Issue 3 , September 2017 , pp. 515 - 522
Copyright
Copyright © Materials Research Society 2017 

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