Long-Life Lithium-Sulfur Batteries with a Bifunctional Cathode Substrate Configured with Boron Carbide Nanowires
- The Univ. of Texas at Austin, Austin TX (United States); University of Texas at Austin
- The Univ. of Texas at Austin, Austin TX (United States)
Developing high-energy-density lithium–sulfur (Li–S) batteries relies on the design of electrode substrates that can host a high sulfur loading and still attain high electrochemical utilization. Herein, a new bifunctional cathode substrate configured with boron-carbide nanowires in situ grown on carbon nanofibers (B4C@CNF) is established through a facile catalyst-assisted process. The B4C nanowires acting as chemical-anchoring centers provide strong polysulfide adsorptivity, as validated by experimental data and first-principle calculations. Meanwhile, the catalytic effect of B4C also accelerates the redox kinetics of polysulfide conversion, contributing to enhanced rate capability. As a result, a remarkable capacity retention of 80% after 500 cycles as well as stable cyclability at 4C rate is accomplished with the cells employing B4C@CNF as a cathode substrate for sulfur. Moreover, the B4C@CNF substrate enables the cathode to achieve both high sulfur content (70 wt%) and sulfur loading (10.3 mg cm-2), delivering a superb areal capacity of 9 mAh cm-2. In addition, Li–S pouch cells fabricated with the B4C@CNF substrate are able to host a high sulfur mass of 200 mg per cathode and deliver a high discharge capacity of 125 mAh after 50 cycles.
- Research Organization:
- Univ. of Texas at Austin, Austin, TX (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- EE0007218
- OSTI ID:
- 1487460
- Alternate ID(s):
- OSTI ID: 1464282
- Journal Information:
- Advanced Materials, Journal Name: Advanced Materials Journal Issue: 39 Vol. 30; ISSN 0935-9648
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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