Rational design of double-confined Mn2O3/S@Al2O3 nanocube cathodes for lithium-sulfur batteries |
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| Authors: | Qiuhong Yu Rongjie Luo Xianlin Bai Wenchao Yang Yang Lu Xiaoyi Hou Tao Peng Xianming Liu Jang-Kyo Kim Yongsong Luo |
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| Affiliation: | 1.School of Physics and Electronic Engineering,Xinyang Normal University,Xinyang,People’s Republic of China;2.Key Laboratory of Microelectronic and Energy of Henan Province,Xinyang Normal University,Xinyang,People’s Republic of China;3.College of Chemistry and Chemical Engineering,Luoyang Normal University,Luoyang,People’s Republic of China;4.Department of Mechanical and Aerospace Engineering,Hong Kong University of Science and Technology,Hong Kong,People’s Republic of China |
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| Abstract: | Due to the high specific capacities and environmental benignity, lithium-sulfur (Li-S) batteries have shown fascinating potential to replace the currently dominant Li-ion batteries to power portable electronics and electric vehicles. However, the shuttling effect caused by the dissolution of polysulfides seriously degrades their electrochemical performance. In this paper, Mn2O3 microcubes are fabricated to serve as the sulfur host, on top of which Al2O3 layers of 2 nm in thickness are deposited via atomic layer deposition (ALD) to form Mn2O3/S (MOS) @Al2O3 composite electrodes. The MOS@Al2O3 electrode delivers an excellent initial capacity of 1012.1 mAh g?1 and a capacity retention of 78.6% after 200 cycles at 0.5 C, and its coulombic efficiency reaches nearly 99%, giving rise to much better performance than the neat MOS electrode. These findings demonstrate the double confinement effect of the composite electrode in that both the porous Mn2O3 structure and the atomic Al2O3 layer serve as the spacious host and the protection layer of sulfur active materials, respectively, for significantly improved electrochemical performance of the Li-S battery. |
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