Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 50, Pages 43707-43715Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b16948
Keywords
polar nanotube arrays; catalytic effect; chemical adsorption; binder-free; lithium-sulfur batteries
Funding
- National Natural Science Foundation of China [U1530401, 21773188, 51802269]
- Program for Innovation Team Building at Institutions of Higher Education in Chongqing [CXTDX201601011]
- Graduate Student Scientific Research Innovation Project of Chongqing [CYB18092]
- Beijing Computational Science Research Center
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Inhibiting the shuttle effect, buffering the volume expansion, and improving the utilization of sulfur have been the three strategic points for developing a high-performance lithium-sulfur (Li-S) battery. Driven by this background, a flexible sulfur host material composed of FeCo2S4 nanotube arrays grown on the surface of carbon cloth is designed for a binder-free cathode of the Li-S battery through two-step hydrothermal method. Among the rest, the interconnected carbon fiber skeleton of the composite electrode ensures the basic electrical conductivity, whereas the FeCo2S4 nanotube arrays not only boost the electron and electrolyte transfer but also inhibit the dissolution of polysulfides because of their strong chemical adsorption. Meanwhile, the hollow structures of these arrays can provide a large inner space to accommodate the volume expansion of sulfur. More significantly, the developed composite electrode also reveals a catalytic action for accelerating the reaction kinetic of the Li-S battery. As a result, the FeCo2S4/CC@S electrode delivers a high discharge capacity of 1384 mA h g(-1) at the current density of 0.1 C and simultaneously exhibits a stable Coulombic efficiency of about 98%.
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