Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 22, Issue 3, Pages 693-703Publisher
SPRINGER
DOI: 10.1007/s10008-017-3799-5
Keywords
Sulfur-MnO2@graphene composite; Physical and chemical adsorptions; Cathode material; Lithium-sulfur battery
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Funding
- Natural Science Fund of Education Department of Shaanxi Provincial Government [16JK1018]
- Natural Science Fund and Subject Merging Fund of Ankang University for high-level talents [2016AYQDZR05, 2017AYJC01]
- Foundation for Young Talents of Shaanxi Science and Technology Department [2016JQ2026]
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Lithium-sulfur (Li-S) battery is considered as a promising option for electrochemical energy storage applications because of its low-cost and high theoretical capacity. However, the practical application of Li-S battery is still hindered due to the poor electrical conductivity of S cathode and the high dissolution/shuttling of polysulfides in electrolyte. Herein, we report a novel physical and chemical entrapment strategy to address these two problems by designing a sulfur-MnO2@graphene (S-MnO2@GN) ternary hybrid material structure. The MnO2 particles with size of similar to 10 nm are anchored tightly on the wrinkled and twisted GN sheets to form a highly efficient sulfur host. Benefiting from the synergistic effects of GN and MnO2 in both improving the electronic conductivity and hindering polysulfides by physical and chemical adsorptions, this unique S-MnO2@GN composite exhibits excellent electrochemical performances. Reversible specific capacities of 1416, 1114, and 421 mA h g(-1) are achieved at rates of 0.1, 0.2, and 3.2 C, respectively. After a 100 cycle stability test, S-MnO2@GN composite cathode could still maintain a reversible capacity of 825 mA h g(-1).
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