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A High-Volumetric-Capacity Cathode Based on Interconnected Close-Packed N-Doped Porous Carbon Nanospheres for Long-Life Lithium–Sulfur Batteries

Hu, C, Kirk, C, Cai, Qiong, Cuadrado- Collados, C, Silvestre-Albero, J, Rodríguez- Reinoso,, F and Biggs, MJ (2017) A High-Volumetric-Capacity Cathode Based on Interconnected Close-Packed N-Doped Porous Carbon Nanospheres for Long-Life Lithium–Sulfur Batteries Advanced Energy Materials.

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Abstract

This study reports a Li–S battery cathode of high volumetric capacity enabled by novel micro- and mesostructuring. The cathode is based on monodisperse highly porous carbon nanospheres derived from a facile template- and surfactant-free method. At the mesoscale, the nanospheres structure into interconnected close-packed clusters of a few microns in extent, thus facilitating the fabrication of dense crack-free high areal sulfur loading (5 mg cm−2) cathodes with high electrical conductivity and low cathode impedance. A combination of the nitrogen doping (5 wt%), high porosity (2.3 cm3 g−1), and surface area (2900 m2 g−1) at the microscale enables high sulfur immobilization and utilization. The cathode delivers among the best reported volumetric capacity to date, above typical Li-ion areal capacity at 0.2 C over 200 cycles and low capacity fading of 0.1% per cycle at 0.5 C over 500 cycles. The compact cathode structure also ensures a low electrolyte requirement (6 µL mg−1), which aids a low overall cell weight, and further, among the best gravimetric capacities published to date as well.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Hu, CUNSPECIFIEDUNSPECIFIED
Kirk, CUNSPECIFIEDUNSPECIFIED
Cai, Qiongq.cai@surrey.ac.ukUNSPECIFIED
Cuadrado- Collados, CUNSPECIFIEDUNSPECIFIED
Silvestre-Albero, JUNSPECIFIEDUNSPECIFIED
Rodríguez- Reinoso,, FUNSPECIFIEDUNSPECIFIED
Biggs, MJUNSPECIFIEDUNSPECIFIED
Date : 21 August 2017
Identification Number : 10.1002/aenm.201701082
Copyright Disclaimer : This is the peer reviewed version of the following article: C. Hu, C. Kirk, Q. Cai, C. Cuadrado-Collados, J. Silvestre-Albero, F. Rodríguez-Reinoso, M. J. Biggs, Adv. Energy Mater. 2017, 1701082. https://doi.org/10.1002/aenm.201701082, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/aenm.201701082/full. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving
Depositing User : Melanie Hughes
Date Deposited : 23 Aug 2017 08:48
Last Modified : 23 Aug 2017 08:48
URI: http://epubs.surrey.ac.uk/id/eprint/842000

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