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Multi-functional nanowall arrays with unrestricted Li+ transport channels and integrated conductive network for high-areal-capacity Li-S batteries

Abstract

The rational design of cathode hosts with superior polysulfide (PS) confinement properties, excellent Li+/e- transport and improved cyclability is of the utmost importance for high-areal-capacity lithium-sulfur (Li-S) batteries. Herein, multi-functional nanowall arrays (MNWA) combining the aforementioned properties are fabricated to improve the electrochemical performance of Li-S batteries with high areal sulfur loadings. The integration of conductive networks and top-down vertically-aligned Li+ transport channels are beneficial to Li+/e- transport, resulting in high rate performance with a discharge capacity of 620 mAh g-1 at a high current density of 9.6 mA cm-2 for 4 mg cm-2 sulfur-loaded S/MNWA electrodes. Additionally, the strong PS shuttling suppression via the synergetic effects of physical confinement and chemical absorption lead to Li-S batteries with sulfur loadings of 10 mg cm-2 capable of delivering a high areal capacity of 12.4 mAh cm-2 with a high capacity retention of nearly 85% for over 100 cycles. What’s more, the Li-S batteries assembled with 4 mg cm-2 sulfur-loaded S/MNWA electrodes show an ultra-low capacity decay of 0.07% per cycle over 400 cycles at 3.2 mA cm-2.

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Publication details

The article was received on 22 Aug 2018, accepted on 05 Oct 2018 and first published on 05 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08188C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Multi-functional nanowall arrays with unrestricted Li+ transport channels and integrated conductive network for high-areal-capacity Li-S batteries

    X. Yang, Y. Yu, X. Lin, J. Liang, K. Adair, Y. Zhao, C. Wang, X. Li, Q. Sun, H. zhang, X. Li, R. Li, H. Zhang and X. Sun, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08188C

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