Origin of High Coulombic Loss During Sodiation in Na-Sn Battery

Title
Origin of High Coulombic Loss During Sodiation in Na-Sn Battery
Authors
안재평변영운최용석이재철
Keywords
Na-Sn; Battery; Sodiation; Coulmbic loss
Issue Date
2017-03
Publisher
Journal of power sources
Citation
VOL 343-519
Abstract
Electrochemical sodiation is performed in crystalline Sn foil using in situ scanning electron microscopy (SEM) to simultaneously measure the changes in the electrical resistivity and volume of the Sn anode in a Na-Sn battery. We observe that sodiation causes an increase in the Sn anode resistivity by six orders of magnitude. Ab initio molecular dynamics simulations of the Na-Sn alloy system demonstrate that the increased resistivity of the anode is caused by the formation of an electrically resistive amorphous NaSn phase (a-NaSn) with a pseudogap. It is also observed that the formation of a-NaSn is always accompanied by a large volume expansion of similar to 200%, causing the development of residual tensile stress. The residual stress in turn alters the electronic structure of the a-NaSn phase, further increasing the resistivity of aNaSn and thus decreasing the energy efficiency of the Na-Sn battery.
URI
http://pubs.kist.re.kr/handle/201004/66894
ISSN
0378-7753
Appears in Collections:
KIST Publication > Article
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