Atomic visualization of a non-equilibrium sodiation pathway in copper sulfide

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Title
Atomic visualization of a non-equilibrium sodiation pathway in copper sulfide
Author(s)
Jae Yeol Park; Sung Joo Kim; Joon Ha Chang; Hyeon Kook Seo; Jeong Yong Lee; Jong Min Yuk
Publication Date
2018-03
Journal
NATURE COMMUNICATIONS, v.9, no., pp.922 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Sodium ion batteries have been considered a promising alternative to lithium ion batteries for large-scale energy storage owing to their low cost and high natural abundance. However, the commercialization of this device is hindered by the lack of suitable anodes with an optimized morphology that ensure high capacity and cycling stability of a battery. Here, we not only demonstrate that copper sulfide nanoplates exhibit close-to-theoretical capacity (similar to 560 mAh g(-1)) and long-term cyclability, but also reveal that their sodiation follows a non-equilibrium reaction route, which involves successive crystallographic tuning. By employing in situ transmission electron microscopy, we examine the atomic structures of four distinct sodiation phases of copper sulfide nanoplates including a metastable phase and discover that the discharge profile of copper sulfide directly reflects the observed phase evolutions. Our work provides detailed insight into the sodiation process of the high-performance intercalation-conversion anode material. © The Author(s) 2018
URI
https://pr.ibs.re.kr/handle/8788114/6199
ISSN
2041-1723
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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