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

Journal Article · · Energy Storage Materials
 [1];  [2];  [3]
  1. Univ. of Texas, Austin, TX (United States). Materials Science&Engineering Program and Texas Materials Institute; Hefei Univ. of Technology (China); University of Texas at Austin
  2. Hefei Univ. of Technology (China)
  3. Univ. of Texas, Austin, TX (United States). Materials Science&Engineering Program and Texas Materials Institute

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
OSTI ID:
1598239
Journal Information:
Energy Storage Materials, Journal Name: Energy Storage Materials Journal Issue: C Vol. 16; ISSN 2405-8297
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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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

Figures / Tables (6)


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