posted on 2021-11-09, 15:04authored byJae Yeol Park, Yoonsu Shim, Khoi Phuong Dao, Sang-Gil Lee, Jacob Choe, Ho Jun Lee, Yonghee Lee, Yuseon Choi, Joon Ha Chang, Seung Jo Yoo, Chi Won Ahn, Wonyoung Chang, Chan-Woo Lee, Jong Min Yuk
Binary
metal sulfides have been explored as sodium storage materials
owing to their high theoretical capacity and high stable cyclability.
Nevertheless, their relative high charge voltage and relatively low
practical capacity make them less attractive as an anode material.
To resolve the problem, addition of alloying elements is considerable.
Copper antimony sulfide is investigated as a representative case.
In this study, we do not only perform electrochemical characterization
on CuSbS2, but also investigate its nonequilibrium sodiation
pathway employing in-/ex situ transmission
electron microscopy, in situ X-ray diffraction, and
density functional theory calculations. Our finding provides valuable
insights on sodium storage into ternary metal sulfide including an
alloying element.