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Article

Sandwich-Type Nitrogen and Sulfur Codoped Graphene-Backboned Porous Carbon Coated Separator for High Performance Lithium-Sulfur Batteries

1
School of Resource and Environment, Henan University of Engineering, No. 1, Xianghe Road, Zhengzhou 451191, China
2
School of Metallurgy and Environment, Central South University, Lushan South Street 932, Yuelu District, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(4), 191; https://doi.org/10.3390/nano8040191
Received: 4 February 2018 / Revised: 23 March 2018 / Accepted: 24 March 2018 / Published: 26 March 2018
(This article belongs to the Special Issue Carbon nanostructure for energy storage and conversion)
Lithium-sulfur (Li-S) batteries have been identified as the greatest potential next- generation energy-storage systems because of the large theoretical energy density of 2600 Wh kg−1. However, its practical application on a massive scale is impeded by severe capacity loss resulted from the notorious polysulfides shuttle. Here, we first present a novel technique to synthesize sandwich-type nitrogen and sulfur codoped graphene-backboned porous carbon (NSGPC) to modify the commercial polypropylene separator in Li-S batteries. The as-synthesized NSGPC exhibits a unique micro/mesoporous carbon framework, large specific surface area (2439.0 m2 g−1), high pore volume (1.78 cm3 g−1), good conductivity, and in situ nitrogen (1.86 at %) and sulfur (5.26 at %) co-doping. Benefiting from the particular physical properties and chemical components of NSGPC, the resultant NSGPC-coated separator not only can facilitate rapid Li+ ions and electrons transfer, but also can restrict the dissolution of polysulfides to alleviate the shuttle effect by combining the physical absorption and strong chemical adsorption. As a result, Li-S batteries with NSGPC-coated separator exhibit high initial reversible capacity (1208.6 mAh g−1 at 0.2 C), excellent rate capability (596.6 mAh g−1 at 5 C), and superior cycling stability (over 500 cycles at 2 C with 0.074% capacity decay each cycle). Propelling our easy-designed pure sulfur cathode to a extremely increased mass loading of 3.4 mg cm−2 (70 wt. % sulfur), the Li-S batteries with this functional composite separator exhibit a superior high initial capacity of 1171.7 mAh g−1, which is quite beneficial to commercialized applications. View Full-Text
Keywords: heteroatom doping; multifunctional separators; shuttle effect; graphene-backboned porous carbon; lithium-sulfur batteries heteroatom doping; multifunctional separators; shuttle effect; graphene-backboned porous carbon; lithium-sulfur batteries
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MDPI and ACS Style

Chen, F.; Ma, L.; Ren, J.; Luo, X.; Liu, B.; Zhou, X. Sandwich-Type Nitrogen and Sulfur Codoped Graphene-Backboned Porous Carbon Coated Separator for High Performance Lithium-Sulfur Batteries. Nanomaterials 2018, 8, 191. https://doi.org/10.3390/nano8040191

AMA Style

Chen F, Ma L, Ren J, Luo X, Liu B, Zhou X. Sandwich-Type Nitrogen and Sulfur Codoped Graphene-Backboned Porous Carbon Coated Separator for High Performance Lithium-Sulfur Batteries. Nanomaterials. 2018; 8(4):191. https://doi.org/10.3390/nano8040191

Chicago/Turabian Style

Chen, Feng, Lulu Ma, Jiangang Ren, Xinyu Luo, Bibo Liu, and Xiangyang Zhou. 2018. "Sandwich-Type Nitrogen and Sulfur Codoped Graphene-Backboned Porous Carbon Coated Separator for High Performance Lithium-Sulfur Batteries" Nanomaterials 8, no. 4: 191. https://doi.org/10.3390/nano8040191

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