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|Title: ||A high-volumetric-capacity cathode based on interconnected close-packed N-doped porous carbon nanospheres for long-life lithium–sulfur batteries|
|Authors: ||Hu, Cheng|
Kirk, Caroline A.
Biggs, Mark J.
|Keywords: ||Close packed|
High volumetric capacity
Interconnected carbon nanospheres
|Issue Date: ||2017|
|Publisher: ||© Wiley|
|Citation: ||HU, C. ... et al, 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, 7(22): paper 1701082.|
|Abstract: ||This study reports a Li–S battery cathode of high volumetric capacity enabled by novel micro- and mesostructuring. The cathode is based on monodis-perse 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 facili-tating 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 immobiliza-tion 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.|
|Description: ||This paper is closed access until 21st August 2018.|
|Sponsor: ||Q.C. gratefully acknowledges the support by the EPSRC program EP/M027066/1.|
|Version: ||Accepted for publication|
|Publisher Link: ||http://dx.doi.org/10.1002/aenm.201701082|
|Appears in Collections:||Closed Access (Chemistry)|
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