Long Cycle Life, Low Self-Discharge Sodium-Selenium Batteries with High Selenium Loading and Suppressed Polyselenide Shuttling
Journal Article
·
· Advanced Energy Materials
- Univ. of Texas, Austin, TX (United States); Hefei Univ. of Technology (China); University of Texas at Austin
- Hefei Univ. of Technology (China)
- Univ. of Texas, Austin, TX (United States)
The utilization of selenium as a cathode in rechargeable sodium–selenium batteries is hampered by low Se loading, inferior electrode kinetics, and polyselenide shuttling between the cathode and anode. Here a high-performance sodium–selenium cell is presented by coupling a binder-free, self-interwoven carbon nanofiber–selenium cathode with a light-weight carbon-coated bifunctional separator. With this strategy, electrodes with a high Se mass loading (4.4 mg cm-2) render high reversible capacities of 599 mA h g-1 at 0.1C rate and 382 mA h g-1 at 5C rate. In addition, this novel cell offers good shelf-life with a low self-discharge, retaining 93.4% of its initial capacity even after resting for six months. As evidenced by experimental and density functional theory analysis, the remarkable dynamic (cycle life) and static (shelf-life) stabilities originate from the high electrical conductivity, improved Na-ion accessibility through the 3D interconnected open channels, and highly restrained polyselenide shuttle. The findings demonstrate the viability of high-performance sodium–selenium batteries with high selenium loading.
- Research Organization:
- Univ. of Texas, Austin, TX (United States)
- Sponsoring Organization:
- China Scholarship Council; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- Grant/Contract Number:
- SC0005397
- OSTI ID:
- 1596645
- Alternate ID(s):
- OSTI ID: 1408155
OSTI ID: 1537409
- Journal Information:
- Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 7 Vol. 8; ISSN 1614-6832
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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