Enabling 100C Fast-Charging Bulk Bi Anodes for Na-Ion Batteries
- Kim, Young-Hoon; An, Jae-Hyun; Kim, Sung-Yeob; Li, Xiangmei; Song, Eun-Ji; Park, Jae-Ho; Chung, Kyung Yoon; Choi, Yong-Seok; Scanlon, David O.; Ahn, Hyo-Jun; Lee, Jae-Chul
- Issue Date
- WILEY-V C H VERLAG GMBH
- 3D porous nanostructures; bismuth anodes; sodium-ion batteries; ultrafast charging
- ADVANCED MATERIALS, v.34, no.27
- Journal Title
- ADVANCED MATERIALS
- It is challenging to develop alloying anodes with ultrafast charging and large energy storage using bulk anode materials because of the difficulty of carrier-ion diffusion and fragmentation of the active electrode material. Herein, a rational strategy is reported to design bulk Bi anodes for Na-ion batteries that feature ultrafast charging, long cyclability, and large energy storage without using expensive nanomaterials and surface modifications. It is found that bulk Bi particles gradually transform into a porous nanostructure during cycling in a glyme-based electrolyte, whereas the resultant structure stores Na ions by forming phases with high Na diffusivity. These features allow the anodes to exhibit unprecedented electrochemical properties; the developed Na-Bi half-cell delivers 379 mA h g(-1) (97% of that measured at 1C) at 7.7 A g(-1) (20C) during 3500 cycles. It also retained 94% and 93% of the capacity measured at 1C even at extremely fast-charging rates of 80C and 100C, respectively. The structural origins of the measured properties are verified by experiments and first-principles calculations. The findings of this study not only broaden understanding of the underlying mechanisms of fast-charging anodes, but also provide basic guidelines for searching battery anodes that simultaneously exhibit high capacities, fast kinetics, and long cycling stabilities.
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- 공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles
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