Long-Life Lithium–Sulfur Batteries with a Bifunctional Cathode Substrate Configured with Boron Carbide Nanowires

Liu Luo, Sheng Heng Chung, Hooman Yaghoobnejad Asl, Arumugam Manthiram

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

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. Additionally, 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.

Original languageEnglish
Article number1804149
JournalAdvanced Materials
Volume30
Issue number39
DOIs
Publication statusPublished - 2018 Sep 26

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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