Engineering Sodium Metal Anode with Sodiophilic Bismuthide Penetration for Dendrite-Free and High-Rate Sodium-Ion Battery. (April 2022)

• Record Type: Journal Article
• Authors: Zhao, Wanyu; Guo, Min; Zuo, Zhijun; Zhao, Xiaoli; Dou, Huanglin; Zhang, Yijie; Li, Shiying; Wu, Zichen; Shi, Yayun; Ma, Zifeng; Yang, Xiaowei
• Is Part Of: Engineering. Volume 11(2022)
• Page Start: 87
• Page End: 94
• Publication Date: 2022-04
• Subjects: Sodium metal anode -- Dendrite-free -- Compact electrodeposition -- Sodiophilic bismuthide -- Ion diffusion barrier; Engineering -- Periodicals; Engineering -- China -- Periodicals; 620.005
• DOI: 10.1016/j.eng.2021.08.028
• Languages: English
• ISSNs: 2095-8099

Abstract

Abstract: Sodium (Na) metal batteries with a high volumetric energy density that can be operated at high rates are highly desirable. However, an uneven Na-ion migration in bulk Na anodes leads to localized deposition/dissolution of sodium during high-rate plating/stripping behaviors, followed by severe dendrite growth and loose stacking. Herein, we engineer the Na hybrid anode with sodiophilic Na3 Bi-penetration to develop the abundant phase-boundary ionic transport channels. Compared to intrinsic Na, the reduced adsorption energy and ion-diffusion barrier on Na3 Bi ensure even Na + nucleation and rapid Na + migration within the hybrid electrode, leading to uniform deposition and dissolution at high current densities. Furthermore, the bismuthide enables compact Na deposition within the sodiophilic framework during cycling, thus favoring a high volumetric capacity. Consequently, the obtained anode was endowed with a high current density (up to 5 mA∙cm −2 ), high areal capacity (up to 5 mA∙h∙cm −2 ), and long-term cycling stability (up to 2800 h at 2 mA∙cm −2 ).