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Promoting the Sulfur Immobilization by a Hierarchical Morphology of Hollow Carbon Nanospheres Cluster for High-stability Li-S Battery

Abstract

The immobilization of sulfur on a conductive carbon host is a valid way to solve the insulating nature of sulfur and relieve the polysulfides shuttle. Herein, we further enhance the physical immobilization efficiency of sulfur through a deliberate design of carbon nanostructure, which integrates micropore, mesopore and hollow nanostructure into a micrometer-sized particle. A hierarchical morphology of hollow carbon nanospheres clusters (HCNCs) are fabricated using colloid chemistry route combined with spray drying technology for the first time. The as-prepared HCNCs have plenty of interior hollows achieving higher sulfur-loading and buffering volume expasion, developed mesoporous channels for rapid ions transfer, and micropore carbon sheath enabling minimized lithium polysulfides shuttle. Such unique carbon architecture endows HCNCs/S composites superior cyclability and rate capability. They could deliver a high initial capacity of 1311 mA h g-1 at 0.2 C and a reversible capacity of 695 mA h g-1 after 500 cycles with low capacity fading rate of 0.094% per cycle. The sulfur cathode demonstrates a good rate capability with 592 mA h g-1 at 5 C. Integrating different morphologies and pore structures could embody the merits and mitigate the shortcomings of every individual, which can be the effective way for future development of high-rate and long-cycle Li–S batteries.

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Publication details

The article was received on 22 Dec 2018, accepted on 07 Feb 2019 and first published on 09 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA12349G
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Promoting the Sulfur Immobilization by a Hierarchical Morphology of Hollow Carbon Nanospheres Cluster for High-stability Li-S Battery

    M. Chen, Z. Su, K. Jiang, Y. Pan, Y. Zhang and D. Long, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA12349G

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