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Title: A three-dimensional self-assembled SnS2-nano-dots@graphene hybrid aerogel as an efficient polysulfide reservoir for high-performance lithium–sulfur batteries

Journal Article · · Journal of Materials Chemistry. A
DOI: https://doi.org/10.1039/c8ta01089g · OSTI ID:1487465

Reliable sulfur cathodes hold the key to realizing high-performance lithium–sulfur (Li–S) batteries, yet the electrochemical inefficiency and instability arising from the poor conductivity of sulfur and lithium sulfide together with polysulfide diffusion present challenges. We present here a new three-dimensional graphene aerogel embedded with in situ grown SnS2 nano-dots (SnS2-ND@G) as an efficient sulfur host. First, benefiting from a highly conductive, hierarchically porous, and mechanically self-supported architecture, the SnS2-ND@G aerogel enables the cathode to hold high sulfur content (75 wt%) and loading (up to 10 mg cm–2). Both values exceed most of the reported metal-compound-related cathode work (<60 wt% sulfur content and <3 mg cm–2 sulfur loading) in the literature. Second, this work takes advantage of a facile one-pot self-assembly fabrication, effectively guaranteeing a homogeneous deposition of SnS2 nano-dots in the graphene aerogel with a small amount of SnS2 (16 wt%). It greatly overcomes the shortcomings of physical incorporation methods to make metal-compound/carbon substrates reported in previous studies. More importantly, by rationally combining the physical entrapment from graphene and chemical adsorptivity from SnS2 nano-dots towards polysulfides, the SnS2-ND@G aerogel demonstrates remarkably improved polysulfide-trapping capability and electrochemical stability. As a result, a high peak capacity of 1234 mA h g–1, a high reversible capacity of 1016 mA h g–1 after 300 cycles, exceptional rate capability (C/10 – 3C rates), and impressive areal capacity (up to 11 mA h cm–2) are achieved. Furthermore, this work provides a viable path to integrate a conductive graphene network and nano-sized SnS2 as a promising cathode substrate for developing advanced Li–S batteries.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007218
OSTI ID:
1487465
Alternate ID(s):
OSTI ID: 1434155
Journal Information:
Journal of Materials Chemistry. A, Vol. 6, Issue 17; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 85 works
Citation information provided by
Web of Science

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Cited By (10)

Long-Life Lithium-Sulfur Batteries with a Bifunctional Cathode Substrate Configured with Boron Carbide Nanowires journal August 2018
Current Status and Future Prospects of Metal–Sulfur Batteries journal May 2019
A 3D Lithiophilic Mo 2 N‐Modified Carbon Nanofiber Architecture for Dendrite‐Free Lithium‐Metal Anodes in a Full Cell journal October 2019
Catalytic Interfaces‐Enriched Hybrid Hollow Spheres Sulfur Host for Advanced Li–S Batteries journal November 2019
High‐Energy Density Li‐Ion Capacitor with Layered SnS 2 /Reduced Graphene Oxide Anode and BCN Nanosheet Cathode journal December 2019
Bifunctional interlayer for capturing polysulfide in Li–S battery journal June 2019
Novel hierarchical structural SnS2 composite supported by biochar carbonized from chewed sugarcane as enhanced anodes for lithium ion batteries journal November 2019
Tin sulfide modified separator as an efficient polysulfide trapper for stable cycling performance in Li–S batteries journal January 2019
SnS 2 /TiO 2 nanohybrids chemically bonded on nitrogen-doped graphene for lithium–sulfur batteries: synergy of vacancy defects and heterostructures journal January 2018
Rational design of polar/nonpolar mediators toward efficient sulfur fixation and enhanced conductivity journal January 2020