Article (Scientific journals)
Aging Processes in Lithiated FeSn2 Based Negative Electrode for Li-ion Batteries: a New Challenge for Tin Based Intermetallic Materials
chamas, mohamad; Mahmoud, Abdelfattah; Tang, Junlei et al.
2017In Journal of Physical Chemistry. C, Nanomaterials and interfaces
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Keywords :
aging; Lithium-ion batteries; impedance spectroscopy; Mossbauer spectroscopy; anode material; FeSn2
Abstract :
[en] Tin based intermetallic compounds proposed as negative electrode materials for Li-ion batteries not only suffer from capacity fade during cycling due to volume variations but also from aging phenomena in lithiated states. By using FeSn2 as a model compound, we propose an analysis of this process by combining electrochemical potential measurements, 119Sn and 57Fe Mössbauer spectroscopies, magnetic measurements and impedance spectroscopy. We show that the Fe/Li7Sn2 composite obtained at the end of the first discharge is progressively transformed during the aging process occurring within the electrochemical cell in open circuit condition. The Fe nanoparticles are stable while the Li7Sn2 nanoparticles are progressively delithiated with time leading to Sn-rich LixSn nano-alloys without observable back reaction with Fe. The deinserted lithium atoms react with the electrolyte and modify the surface electrode interphase (SEI) by increasing its thickness and/or decreasing its porosity
Disciplines :
Chemistry
Author, co-author :
chamas, mohamad;  Southwest Petroleum University,
Mahmoud, Abdelfattah  ;  Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Tang, Junlei;  Southwest Petroleum University,
Sougrati, Moulay Tahar;  Université de Montpellier
Stefania, Panero;  Universita di Roma « La Sapienza »
Pierre-Emmanuel, Lippens;  Université de Montpellier
Language :
English
Title :
Aging Processes in Lithiated FeSn2 Based Negative Electrode for Li-ion Batteries: a New Challenge for Tin Based Intermetallic Materials
Publication date :
2017
Journal title :
Journal of Physical Chemistry. C, Nanomaterials and interfaces
ISSN :
1932-7447
eISSN :
1932-7455
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Région Languedoc-Rousillon
National Natural Science Foundation of China under grant no 21650110463
Available on ORBi :
since 20 December 2016

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