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 2024-01-19T11:34:07Z 2024-01-19T11:34:07Z 2022-06-17 2022-07 0935-9648 https://pubs.kist.re.kr/handle/201004/114915 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. English WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Enabling 100C Fast-Charging Bulk Bi Anodes for Na-Ion Batteries Article 10.1002/adma.202201446 1 Advanced Materials, v.34, no.27 Advanced Materials 34 27 N scie scopus 000804990900001 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article LITHIUM-ION TIN NANOPARTICLES MICROSIZED SN ULTRA-FAST SODIUM BISMUTH PERFORMANCE ELECTROLYTE SODIATION DIFFUSION 3D porous nanostructures bismuth anodes sodium-ion batteries ultrafast charging