Journal article
Tubular titanium oxide/reduced graphene oxide-sulfur composite for improved performance of lithium sulfur batteries
Carbon (New York), Vol.128(C)
11/20/2017
Abstract
Lithium sulfur (Li-S) batteries are promising alternatives to conventional Li-ion batteries in terms of specific capacity and energy. However, the technical challenges raised from the soluble polysulfide (PS) in organic electrolyte deter their implementation in practical applications. Nanoengineered structure and chemical adsorptive materials hold great promise in mitigating the PS migration problem. Here, we develop a tubular titanium oxide (TiO2)/reduced graphene oxide (rGO) composite structure (TG) as a sulfur hosting material for constructing better performed Li-S batteries. The TG/sulfur cathode (TG/S) is able to deliver ~1200 mAh g-1 specific capacity with stable operation for over 550 cycles. Moreover, the TG/S composite cathode shows stable Coulombic efficiencies of over ~95% at various C rates, which are ~10% higher than those of the rGO/sulfur (G/S) counterparts. The superior electrochemical performances of TG/S could be ascribed to the synergistic effects between the conductive rGO support and the physically/chemically absorptive TiO2, that is, the spatial tubular structure of TiO2 provides intimate contact and physical confinement for sulfur, while the polar TiO2 in TG/S shows strong chemical interaction towards the sulfur species.
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Details
- Title
- Tubular titanium oxide/reduced graphene oxide-sulfur composite for improved performance of lithium sulfur batteries
- Creators
- Junhua SongJianming Zheng - Pacific Northwest National Lab. (PNNL), Richland, WA (United States] (ORCID:0000000249288194Shuo Feng - Washington State UniversityChengzhou Zhu - Washington State UniversityShaofang Fu - Washington State UniversityWengao Zhao - Pacific Northwest National Lab. (PNNL), Richland, WA (United StatesDan Du - Washington State UniversityYuehe Lin - Washington State University
- Publication Details
- Carbon (New York), Vol.128(C)
- Academic Unit
- School of Mechanical and Materials Engineering
- Publisher
- Elsevier
- Identifiers
- 99901227636001842
- Language
- English
- Resource Type
- Journal article