期刊
ACS NANO
卷 15, 期 12, 页码 19457-19467出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c06213
关键词
lithium-sulfur battery; MXene; coordination engineering; hierarchical pore; catalytic conversion
类别
资金
- Department of Science and Technology of Guangdong province [2019JC01L203, 2020B0909030004]
- Science and Technology Program of Guangzhou [2019050001]
- Outstanding Youth Project of Guangdong Natural Science Foundation [2021B1515020051]
- Science and Technology Program of Zhaoqing [2019K038]
- China Postdoctoral Science Foundation [2021M691087]
- Program for Natural Science Foundation of Hebei Province of China [B2021202028, B2020202052]
- Outstanding Young Talents of Hebei Province, China
- Chunhui Project of Ministry of Education of the People's Republic of China [Z2017010]
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, China [EERI_PI2020007]
- Natural Sciences and Engineering Research Council of Canada, University of Waterloo
- Waterloo Institute for Nanotechnology, Chinese Academy of Sciences (CAS)
- Vacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS)
The hierarchical porous MXene microspheres fabricated through spray drying and chemical etching strategies offer uniform sulfur distribution, prevent restacking of MXene sheets, and provide abundant active edges for strong lithium polysulfide adsorption. These structural advantages enhance cycling and rate performances of sulfur cathode, even under high sulfur loading and low electrolyte content.
Lithium-sulfur (Li-S) batteries hold great promise for next-generation electronics owing to their high theoretical energy density, low cost, and eco-friendliness. Nevertheless, the practical implementation of Li-S batteries is hindered by the shuttle effect and sluggish reaction kinetics of polysulfides. Herein, the spray drying and chemical etching strategies are implemented to fabricate hierarchically porous MXene microspheres as a multifunctional sulfur electrocatalyst. The interconnected skeleton offers uniform sulfur distribution and prevents the restacking of MXene sheets, while the abundant edges endow the nanosheet-like Ti3C2 with rich active sites and regulated a d-band center of Ti atoms, leading to strong lithium polysulfide (UPS) adsorption. The unsaturated Ti on edge sites can further act as multifunctional sites for chemically anchoring LiPS and lowering Li-ion migration barriers, accelerating LiPS conversion. Owing to these structural advantages, excellent cycling and rate performances of the sulfur cathode can be obtained, even under a raised sulfur loading and lean electrolyte content.
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