Fe excess in hydrothermally synthesized LiFePO                         4

Xiaofei Sun; Youlong Xu

doi:10.1016/j.matlet.2012.06.053

Fe excess in hydrothermally synthesized LiFePO ₄

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Olivine lithium iron phosphate (LiFePO ₄ ) is synthesized by a typical hydrothermal route. Although X-ray diffraction (XRD) shows no detectable impurities, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) demonstrates extra iron (Fe) in the sample which is further indicated as crystallographic defects occupying lithium sites and a small amount of surface amorphous Fe ³ impurities by Rietveld refinement of high resolution synchrotron XRD and Raman spectroscopy, respectively. The latter possibility is also verified by high resolution transmission electron microscopy (HRTEM) and galvanostatic discharge/charge measurements between 2.0 and 3.2 V (vs. Li/Li). In addition, the influence of Fe excess on the electrochemical performance of LiFePO ₄ as a cathode material for lithium ion batteries (LIBs) is discussed.

Original language	English
Pages (from-to)	139-142
Number of pages	4
Journal	Materials Letters
Volume	84
DOIs	https://doi.org/10.1016/j.matlet.2012.06.053
State	Published - 1 Oct 2012

Keywords

Defects
Energy storage and conversion
Fe excess
Hydrothermal
Lithium iron phosphate
Surfaces

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.matlet.2012.06.053

Cite this

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title = " Fe excess in hydrothermally synthesized LiFePO 4 ",

abstract = " Olivine lithium iron phosphate (LiFePO 4 ) is synthesized by a typical hydrothermal route. Although X-ray diffraction (XRD) shows no detectable impurities, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) demonstrates extra iron (Fe) in the sample which is further indicated as crystallographic defects occupying lithium sites and a small amount of surface amorphous Fe 3 impurities by Rietveld refinement of high resolution synchrotron XRD and Raman spectroscopy, respectively. The latter possibility is also verified by high resolution transmission electron microscopy (HRTEM) and galvanostatic discharge/charge measurements between 2.0 and 3.2 V (vs. Li/Li). In addition, the influence of Fe excess on the electrochemical performance of LiFePO 4 as a cathode material for lithium ion batteries (LIBs) is discussed.",

keywords = "Defects, Energy storage and conversion, Fe excess, Hydrothermal, Lithium iron phosphate, Surfaces",

author = "Xiaofei Sun and Youlong Xu",

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doi = "10.1016/j.matlet.2012.06.053",

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journal = "Materials Letters",

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T1 - Fe excess in hydrothermally synthesized LiFePO 4

AU - Sun, Xiaofei

AU - Xu, Youlong

PY - 2012/10/1

Y1 - 2012/10/1

N2 - Olivine lithium iron phosphate (LiFePO 4 ) is synthesized by a typical hydrothermal route. Although X-ray diffraction (XRD) shows no detectable impurities, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) demonstrates extra iron (Fe) in the sample which is further indicated as crystallographic defects occupying lithium sites and a small amount of surface amorphous Fe 3 impurities by Rietveld refinement of high resolution synchrotron XRD and Raman spectroscopy, respectively. The latter possibility is also verified by high resolution transmission electron microscopy (HRTEM) and galvanostatic discharge/charge measurements between 2.0 and 3.2 V (vs. Li/Li). In addition, the influence of Fe excess on the electrochemical performance of LiFePO 4 as a cathode material for lithium ion batteries (LIBs) is discussed.

AB - Olivine lithium iron phosphate (LiFePO 4 ) is synthesized by a typical hydrothermal route. Although X-ray diffraction (XRD) shows no detectable impurities, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) demonstrates extra iron (Fe) in the sample which is further indicated as crystallographic defects occupying lithium sites and a small amount of surface amorphous Fe 3 impurities by Rietveld refinement of high resolution synchrotron XRD and Raman spectroscopy, respectively. The latter possibility is also verified by high resolution transmission electron microscopy (HRTEM) and galvanostatic discharge/charge measurements between 2.0 and 3.2 V (vs. Li/Li). In addition, the influence of Fe excess on the electrochemical performance of LiFePO 4 as a cathode material for lithium ion batteries (LIBs) is discussed.

KW - Defects

KW - Energy storage and conversion

KW - Fe excess

KW - Hydrothermal

KW - Lithium iron phosphate

KW - Surfaces

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DO - 10.1016/j.matlet.2012.06.053

M3 - 文章

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