ZnSe/N-doped carbon nanoreactor with multiple adsorption sites for stable lithium-sulfur batteries

To commercially realize the enormous potential of lithium-sulfur batteries (LSBs) several challenges remain to be overcome. At the cathode, the lithium polysulfide (LiPS) shuttle effect must be inhibited and the redox reaction kinetics need to be substantially promoted. In this direction, this work...

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Bibliographic Details
Authors: Yang, Dawei|||0000-0002-3842-8286, Zhang, Chaoqi|||0000-0002-0357-235X, Jacas Biendicho, Jordi|||0000-0001-5981-6168, Han, Xu|||0000-0001-8319-8830, Liang, Zhifu, Du, Ruifeng, Li, Mengyao|||0000-0002-9082-7938, Li, Junshan|||0000-0002-1482-1972, Arbiol i Cobos, Jordi|||0000-0002-0695-1726, Llorca, Jordi|||0000-0002-7447-9582, Zhou, Yingtang|||0000-0002-8678-295X, Morante, Joan Ramon|||0000-0002-4981-4633, Cabot i Codina, Andreu|||0000-0002-7533-3251
Format: article
Publication Date:2020
Country:España
Institution:Universitat Autònoma de Barcelona
Repository:Dipòsit Digital de Documents de la UAB
Language:English
OAI Identifier:oai:ddd.uab.cat:271953
Online Access:https://ddd.uab.cat/record/271953
https://dx.doi.org/urn:doi:10.1021/acsnano.0c06112
Access Level:Open access
Keyword:Zinc selenide
Nanoreactor
Lithium polysulfide
Shuttle effect
Lithium-sulfur batteries
Description
Summary:To commercially realize the enormous potential of lithium-sulfur batteries (LSBs) several challenges remain to be overcome. At the cathode, the lithium polysulfide (LiPS) shuttle effect must be inhibited and the redox reaction kinetics need to be substantially promoted. In this direction, this work proposes a cathode material based on a transition-metal selenide (TMSe) as both adsorber and catalyst and a hollow nanoreactor architecture: ZnSe/N-doped hollow carbon (ZnSe/NHC). It is here demonstrated both experimentally and by means of density functional theory that this composite provides three key benefits to the LSBs cathode: (i) A highly effective trapping of LiPS due to the combination of sulfiphilic sites of ZnSe, lithiophilic sites of NHC, and the confinement effect of the cage-based structure; (ii) a redox kinetic improvement in part associated with the multiple adsorption sites that facilitate the Li diffusion; and (iii) an easier accommodation of the volume expansion preventing the cathode damage due to the hollow design. As a result, LSB cathodes based on S@ZnSe/NHC are characterized by high initial capacities, superior rate capability, and an excellent stability. Overall, this work not only demonstrates the large potential of TMSe as cathode materials in LSBs but also probes the nanoreactor design to be a highly suitable architecture to enhance cycle stability.

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