Super heating/cooling rate enabled by microwave shock on polymeric graphene foam for high performance Lithium–Sulfur batteries

3D polymeric graphene foam (PGF) deposited with Mn3O4 nanocrystals are synthesized via a structural-enhanced microwave plasma technique as highly efficient electrocatalyst for lithium–sulfur battery. The uniform pore-structure of PGF enables high-temperature Ar plasma around 1536 K under microwave i...

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Bibliographic Details
Published in:Carbon (New York) 2021-03, Vol.173, p.809-816
Main Authors: Liu, Yiyang, Zhang, Yan, Liu, Yang, Zhu, Jie, Ge, Zhen, Li, Zhongjun, Chen, Yongsheng
Format: Article
Language:English
Subjects:
Batteries
Cooling rate
Electrocatalysts
Electron transport
Graphene
Heating
High temperature
Lithium
Lithium sulfur batteries
Lithium–sulfur electrocatalyst
Manganese oxides
Microstructure
Microwave plasmas
Microwave shock synthesis
Nanocomposites
Nanocrystals
Plastic foams
Polymeric graphene foam
Super heating/cooling rate
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Summary:3D polymeric graphene foam (PGF) deposited with Mn3O4 nanocrystals are synthesized via a structural-enhanced microwave plasma technique as highly efficient electrocatalyst for lithium–sulfur battery. The uniform pore-structure of PGF enables high-temperature Ar plasma around 1536 K under microwave irradiation, which leads to super heating/cooling rate of >13700 K s−1 forming Mn3O4 nanocrystals in 1.2 s. Interconnected PGF layers deposited with the Mn3O4 crystals around 8 nm in diameters can effectively promote the electron transport and anchoring/catalyzing the polysulfides conversion. The cathode exhibits a good capacity fading of 0.092% per cycle over 300 discharge/charge cycles at 0.2 C, indicating good reversibility. The high Mn3O4/graphene ratio and small particle size of the nanocomposite are hard to achieve by other methods within this short period. The instant and low-cost synthesis method is readily scalable and may provide a promising direction for the practical manufacturing of high-performance Li–S batteries. Polymeric graphene foam enables high-temperature Ar plasma, which leads to super heating/cooling rate of >13700 K s−1 forming Mn3O4 nanocrystals (8 nm in size) in 1.2 s. The uniformly synthesized nanocrystals on graphene foam act as highly efficient electrocatalysts for lithium sulfur batteries. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2020.11.061