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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; ... Lee, Jae-Chul; + view all (2022) Enabling 100C Fast-Charging Bulk Bi Anodes for Na-Ion Batteries. Advanced Materials , 34 (27) , Article e2201446. 10.1002/adma.202201446. Green open access

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Abstract

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, we report a rational strategy 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. We 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 allowed the anodes to exhibit unprecedented electrochemical properties; the developed Na-Bi half-cell 379 mAhg-1 (97% of that measured at 1C) at 7.7 Ag-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 were verified by experiments and first-principles calculations. The findings of this study not only broaden our 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. This article is protected by copyright. All rights reserved.

Type: Article
Title: Enabling 100C Fast-Charging Bulk Bi Anodes for Na-Ion Batteries
Location: Germany
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/adma.202201446
Publisher version: https://doi.org/10.1002/adma.202201446
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: 3D porous nanostructures, DFT calculations, bismuth anodes, sodium-ion batteries, ultrafast charging
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10148598
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