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Double-walled N-doped carbon@NiCo2S4 hollow capsules as SeS2 hosts for advanced Li-SeS2 batteries

Abstract

Selenium sulfide as a new class of optional cathode material can enhance the conductivity of insulating sulfur that causes rapid capacity degradation and low Coulombic efficiency of lithium-sulfur (Li-S) batteries. In this work, selenium disulfide (SeS2) as an active ingredient is encapsulated into a double-walled N-doped carbon (NC)@NiCo2S4 hollow capsules (NiCo2S4@NC-SeS2) to obtain high-performance Li-SeS2 batteries. On the basis of ensuring excellent electrical conductivity, the hollow NiCo2S4 lining and its NC coating can not only suppress the shuttle effect of polyselenium/sulfide by the combined chemical adsorption and physical constrain merit, but also are able to buffer the volume expansion of SeS2. Moreover, the polar NiCo2S4 is beneficial to enhance the redox kinetic of lithium polyselenium/sulfide. As expected, the NiCo2S4@NC-SeS2 cathode delivers high reversible capacities of 1205.1 mAh g-1 at 0.1 C and 673.5 mAh g-1 at 2.0 C. More importantly, the hybrid cell can show ultralong cycling life up to 800 cycles at 1.0 C with the attenuation rate as low as 0.038 % per cycle, which is more superior to that of NiCo2S4-SeS2 and NC-SeS2 composites.

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Publication details

The article was received on 12 Mar 2019, accepted on 16 Apr 2019 and first published on 16 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA02695A
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Double-walled N-doped carbon@NiCo2S4 hollow capsules as SeS2 hosts for advanced Li-SeS2 batteries

    B. Guo, T. Yang, W. Du, Q. Ma, L. Zhang, S. Bao, X. Li, Y. Chen and M. Xu, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA02695A

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