Byeon, Young-Woon Choi, Yong-Seok Ahn, Jae-Pyoung Lee, Jae-Chul 2024-01-20T02:01:53Z 2024-01-20T02:01:53Z 2021-09-01 2017-03-01 0378-7753 https://pubs.kist.re.kr/handle/201004/122968 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. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV SODIUM-ION BATTERIES TIN ALLOYS STORAGE ANODES EQUILIBRIUM CHALLENGES NANOWIRES STABILITY INSERTION Origin of high Coulombic loss during sodiation in Na-Sn battery Article 10.1016/j.jpowsour.2017.01.089 1 JOURNAL OF POWER SOURCES, v.343, pp.513 - 519 JOURNAL OF POWER SOURCES 343 513 519 scie scopus 000395211200058 2-s2.0-85010711627 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article SODIUM-ION BATTERIES TIN ALLOYS STORAGE ANODES EQUILIBRIUM CHALLENGES NANOWIRES STABILITY INSERTION Sodium-ion battery Sodiation Phase transition Electrical resistivity Ab initio calculation Pseudogap