Home
Dr.Wu
Research
Member
Publications
News
Contact
2D Hybrid Interlayer of Electrochemically Exfoliated Graphene and Co(OH)2 Nanosheet as a Bi-functionalized Polysulfide Barrier for High-Performance Lithium-Sulfur Batteries
Publications
 
All
2018
2017
2016
2015
2014
2013
2012
2011
2010
2009
2007
2006
   
2D Hybrid Interlayer of Electrochemically Exfoliated Graphene and Co(OH)2 Nanosheet as a Bi-functionalized Polysulfide Barrier for High-Performance Lithium-Sulfur Batteries
Posted:2018-09-03 18:56    Column:2018

H.D. Shi, Y. F. Dong, F. Zhou, J. Chen, Z.-S. Wu*,
Journal of Physics: Energy, 2018, Accepted
DOI: JPENERGY-1000XX

      

Lithium sulfur (Li-S) batteries have attracted much attention because of high energy density, low cost and environmental friendliness. However, developing high-energy-density Li-S batteries is seriously hindered by their short cycling life, originating from the shuttle effect of soluble polysulfides. Herein we for the first time develop a versatile and facile strategy of assembling thin and lightweight bi-functionalized hybrid interlayer constructed by two-dimensional (2D) electrochemically exfoliated graphene and Co(OH)2 nanosheets (EG/Co(OH)2), positioned between the cathode and commercial polypropylene (PP) separator, for high-performance Li-S batteries with remarkably enhanced capacity, rate capability and long-term cyclability. The resulting 2D EG/Co(OH)2 hybrid interlayer features layer-stacked structure, thin thickness of 5.5 μm, high electrical conductivity of 900 S/cm, low mass loading of 0.20 mg cm-2, and exhibits bi-functionalized roles of polysulfide physical barrier from EG nanosheets and high chemical adsorption for polysulfides by Co(OH)2 nanosheets. As a result, the assembled Li-S batteries based on graphene-S cathode, using EG/Co(OH)2 interlayer, showed greatly enhanced discharge capacity of 918 mAh/g at 0.5 C, in comparison with the cells (831 mAh/g) free of EG/Co(OH)2 interlayer. Furthermore, our Li-S batteries with EG/Co(OH)2 interlayer displayed outstanding rate capacity of 677 mAh/g at 5 C, and exceptional cycling stability with a high capacity of 565 mAh/g after 300 cycles at 0.5 C, corresponding to ultralow capacity fade rate of only 0.130% per cycle. Therefore, our strategy of constructing a hybrid interlayer consisting of 2D different nanosheets will offer numerous opportunities for designing long-life and high-energy-density Li-S batteries.

Dalian Institute of Chemical Physics, CAS
457 Zhongshan Road Dalian, China 116023
E-mail: wuzs@dicp.ac.cn
Copyright © 2015-2018. 2D Materials & Energy Devices Lab. All Rights Reserved. 网站管理 Home / Dr.Wu / Research / Member / Publications / News / Contact