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Title: N-doped Fe3C@C as an efficient polyselenide reservoir for high-performance sodium-selenium batteries

Journal Article · · Energy Storage Materials
 [1]; ORCiD logo [2];  [3]
  1. Univ. of Texas, Austin, TX (United States). Materials Science&Engineering Program and Texas Materials Institute; Hefei Univ. of Technology (China)
  2. Hefei Univ. of Technology (China)
  3. Univ. of Texas, Austin, TX (United States). Materials Science&Engineering Program and Texas Materials Institute
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Sodium-selenium batteries are receiving intense attention due to their high theoretical energy density and low cost, but their pragmatic realization are still impinged by sluggish electrode kinetics and dissolution of sodium polyselenide. In this article, we present a strategy to enable porous N-doped Fe3C@C matrix to better entrap polyselenide and enhance the capability of the cell, whereby Fe3C serves as an efficient polyselenide reservoir via stronger chemisorption, as clearly evidenced by experimental analysis and DFT simulations. The as-fabricated half cells with 72.6 wt.% selenium content exhibit highly reversible capacities of 620 mA h g-1 at 0.1C rate and 405 mA h g-1 at a high rate of 5C. Moreover, the cell provides superior static stability (shelf-life) as illustrated by its 98.7% capacity retention even after storing for three months. Finally, this material is also paired with Na3V2O2(PO4)2F cathode in full cells to realize a stable discharge capacity of 108 mAh g-1 (based on the weights of both the anode cathode) at 0.1C rate over 50 cycles, thus demonstrating N-doped Fe3C@C a superior host for sodium-selenium batteries.

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:
1598239
Alternate ID(s):
OSTI ID: 1564382
Journal Information:
Energy Storage Materials, Vol. 16, Issue C; ISSN 2405-8297
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (3)

Synthesis, Morphology and Magnetic Properties of Fe 3 C/CNTs Composites by a g‐C 3 N 4 Route journal December 2019
An alkali metal–selenium battery with a wide temperature range and low self-discharge journal January 2019
Application of Operando X-ray Diffractometry in Various Aspects of the Investigations of Lithium/Sodium-Ion Batteries journal November 2018

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Related Subjects

36 MATERIALS SCIENCE
25 ENERGY STORAGE
Sodium-selenium batteries
N-doped Fe3C@C matrix
Polyselenide shuttle
Shelf-life
Full cell