15August2020

Nano-Micro Letters

Sandwiching Sulfur into the Dents Between N, O Co-Doped Graphene Layered Blocks with Strong Physicochemical Confinements for Stable and High-Rate Li-S Batteries

Mengjiao Shi1, #, Su Zhang2, #, Yuting Jiang1, Zimu Jiang1, Longhai Zhang1, Jin Chang1, Tong Wei1, 3, *, Zhuangjun Fan1, 3, *

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Nano-Micro Lett. (2020) 12: 146

First Online: 13 July 2020 (Article)

DOI:10.1007/s40820-020-00477-3

*Corresponding author. E-mail: weitong666@163.com (T. Wei); fanzhj666@163.com (Z. Fan)

 

Abstract

 


Toc

The development of lithium-sulfur batteries (LSBs) is restricted by their poor cycle stability and rate performance due to the low conductivity of sulfur and severe shuttle effect. Herein, an N, O co-doped graphene layered-block (NOGB) with many dents on the graphene sheet is designed as effective sulfur host for high-performance LSBs. The sulfur platelets are physically confined into the dents and closely contacted with the graphene scaffold, ensuring structural stability and high conductivity. The highly doped N and O atoms can prevent the shuttle effect of sulfur species by strong chemical adsorption. Moreover, the micropores on the graphene sheets enable fast Li+ transport through the blocks. As a result, the obtained NOGB/S composite with 76 wt% sulfur content shows a high capacity of 1413 mAh g-1 at 0.1 C, good rate performance of 433 mAh g-1 at 10 C, and remarkable stability with 526 mAh g-1 at after 1000 cycles at 1 C (average decay rate: 0.038% per cycle). Our design provides a comprehensive route for simultaneously improving the conductivity, ion transport kinetics, and preventing the shuttle effect in LSBs. 


 

Keywords

Graphene, Physicochemical confinement, Cycle stability, Shuttle effect, Li-S batteries

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