Asymmetry between charge and discharge during high rate cycling in LiFePO4 - In Situ X-ray diffraction study

Ho Chul Shin; Kyung Yoon Chung; Won Sik Min; Dong Jin Byun; Ho Jang; Byung Won Cho

doi:10.1016/j.elecom.2008.02.002

Asymmetry between charge and discharge during high rate cycling in LiFePO₄ - In Situ X-ray diffraction study

Ho Chul Shin, Kyung Yoon Chung, Won Sik Min, Dong Jin Byun, Ho Jang, Byung Won Cho

Department of Materials Science and Engineering

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

63 Citations (Scopus)

Abstract

Asymmetric behavior of structural changes during charge and discharge of C-coated LiFePO₄ has been investigated using synchrotron based in situ XRD. C-coated LiFePO₄ undergoes phase transformation from triphylite to heterosite during charge and vise versa during discharge. However, it is observed that the phase transformation of C-coated Li_1-xFePO₄ during discharge is more difficult to be complete than that during charge. At 2C rate, the phase transformation from heterosite to triphylite was hardly observed during discharge while the complete phase transformation was observed in the previous charge. This indicates that the degree of the phase transformation completeness depends on the direction of the phase transformations.

Original language	English
Pages (from-to)	536-540
Number of pages	5
Journal	Electrochemistry Communications
Volume	10
Issue number	4
DOIs	https://doi.org/10.1016/j.elecom.2008.02.002
Publication status	Published - 2008 Apr

Keywords

Asymmetry
In situ X-ray diffraction
LiFePO
Lithium secondary batteries

ASJC Scopus subject areas

Electrochemistry

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10.1016/j.elecom.2008.02.002

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@article{ddac50bd569a424dadf303483b1696ce,

title = "Asymmetry between charge and discharge during high rate cycling in LiFePO4 - In Situ X-ray diffraction study",

abstract = "Asymmetric behavior of structural changes during charge and discharge of C-coated LiFePO4 has been investigated using synchrotron based in situ XRD. C-coated LiFePO4 undergoes phase transformation from triphylite to heterosite during charge and vise versa during discharge. However, it is observed that the phase transformation of C-coated Li1-xFePO4 during discharge is more difficult to be complete than that during charge. At 2C rate, the phase transformation from heterosite to triphylite was hardly observed during discharge while the complete phase transformation was observed in the previous charge. This indicates that the degree of the phase transformation completeness depends on the direction of the phase transformations.",

keywords = "Asymmetry, In situ X-ray diffraction, LiFePO, Lithium secondary batteries",

author = "Shin, {Ho Chul} and Chung, {Kyung Yoon} and Min, {Won Sik} and Byun, {Dong Jin} and Ho Jang and Cho, {Byung Won}",

note = "Funding Information: This work was supported by the Growth Engine Technology Development Program funded by the Ministry of Commerce, Industry and Energy (MOCIE) of Korea. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2008",

month = apr,

doi = "10.1016/j.elecom.2008.02.002",

language = "English",

volume = "10",

pages = "536--540",

journal = "Electrochemistry Communications",

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T1 - Asymmetry between charge and discharge during high rate cycling in LiFePO4 - In Situ X-ray diffraction study

AU - Shin, Ho Chul

AU - Chung, Kyung Yoon

AU - Min, Won Sik

AU - Byun, Dong Jin

AU - Jang, Ho

AU - Cho, Byung Won

N1 - Funding Information: This work was supported by the Growth Engine Technology Development Program funded by the Ministry of Commerce, Industry and Energy (MOCIE) of Korea. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2008/4

Y1 - 2008/4

N2 - Asymmetric behavior of structural changes during charge and discharge of C-coated LiFePO4 has been investigated using synchrotron based in situ XRD. C-coated LiFePO4 undergoes phase transformation from triphylite to heterosite during charge and vise versa during discharge. However, it is observed that the phase transformation of C-coated Li1-xFePO4 during discharge is more difficult to be complete than that during charge. At 2C rate, the phase transformation from heterosite to triphylite was hardly observed during discharge while the complete phase transformation was observed in the previous charge. This indicates that the degree of the phase transformation completeness depends on the direction of the phase transformations.

AB - Asymmetric behavior of structural changes during charge and discharge of C-coated LiFePO4 has been investigated using synchrotron based in situ XRD. C-coated LiFePO4 undergoes phase transformation from triphylite to heterosite during charge and vise versa during discharge. However, it is observed that the phase transformation of C-coated Li1-xFePO4 during discharge is more difficult to be complete than that during charge. At 2C rate, the phase transformation from heterosite to triphylite was hardly observed during discharge while the complete phase transformation was observed in the previous charge. This indicates that the degree of the phase transformation completeness depends on the direction of the phase transformations.

KW - Asymmetry

KW - In situ X-ray diffraction

KW - LiFePO

KW - Lithium secondary batteries

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