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Title: Long Cycle Life, Low Self-Discharge Sodium-Selenium Batteries with High Selenium Loading and Suppressed Polyselenide Shuttling

Journal Article · · Advanced Energy Materials
 [1];  [2]; ORCiD logo [3]
  1. Univ. of Texas, Austin, TX (United States); Hefei Univ. of Technology (China)
  2. Hefei Univ. of Technology (China)
  3. 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:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; China Scholarship Council
Grant/Contract Number:
SC0005397; 201606690005
OSTI ID:
1596645
Alternate ID(s):
OSTI ID: 1408155
Journal Information:
Advanced Energy Materials, Vol. 8, Issue 7; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 78 works
Citation information provided by
Web of Science

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CNT Interwoven Nitrogen and Oxygen Dual-Doped Porous Carbon Nanosheets as Free-Standing Electrodes for High-Performance Na-Se and K-Se Flexible Batteries journal October 2018
Remedies for Polysulfide Dissolution in Room‐Temperature Sodium–Sulfur Batteries journal September 2019
Electrochemically Stable Sodium Metal‐Tellurium/Carbon Nanorods Batteries journal November 2019
Multiscale Porous Carbon Nanomaterials for Applications in Advanced Rechargeable Batteries journal September 2018
Sodium-based batteries: from critical materials to battery systems journal January 2019
A long life sodium–selenium cathode by encapsulating selenium into N-doped interconnected carbon aerogels journal January 2019
A highly-effective nitrogen-doped porous carbon sponge electrode for advanced K–Se batteries journal January 2020
Carbon capsule confined Sb 2 Se 3 for fast Na + extraction in sodium-ion batteries journal January 2020
Effect of eutectic accelerator in selenium-doped sulfurized polyacrylonitrile for high performance room temperature sodium–sulfur batteries journal January 2019
Stabilization of Electrospun PAN/Gelatin Nanofiber Mats for Carbonization journal October 2018
Free-Standing Selenium Impregnated Carbonized Leaf Cathodes for High-Performance Sodium-Selenium Batteries journal January 2019