Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 17, Pages 15012-15020Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00942
Keywords
first-principles calculation; two-dimensional; energy storage; shuttle effect; lithium polysulfide; adsorption
Funding
- National Natural Science Foundation of China [21433006, 11774201]
- 111 project [B13029]
- Shandong Province Education Department [J14LJ03]
- Fundamental Research Funds of Shandong University [2015HW012]
- Natural Science Foundation of Shandong Province [ZR2016AB12]
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Despite the high theoretical capacity of lithium-sulfur (Li-S) batteries, their commercialization is severely hindered by low cycle stability and low efficiency, stemming from the dissolution and diffusion of lithium polysulfides (LiPSs) in the electrolyte. In this study, we propose a novel two-dimensional conductive metal-organic framework, namely, Cu-benzenehexathial (BHT), as a promising sulfur host material for high-performance Li-S batteries. The conductivity of Cu-BHT eliminates the insulating nature of most S-based electrodes. The dissolution of LiPSs into the electrolyte is largely prevented by the strong interaction between Cu-BHT and LiPSs. In addition, orientated deposition of Li2S on Cu-BHT facilitates the kinetics of the LiPS redox reaction. Therefore, the use of Cu-BHT for Li-S battery cathodes is expected to suppress the LiPS shuttle effect and to improve the overall performance, which is ideal for practical application of Li-S batteries.
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