Achieving stable Na metal cycling via polydopamine/multilayer graphene coating of a polypropylene separator

Sodium metal batteries are considered one of the most promising low-cost high-energy-density electrochemical energy storage systems. However, the growth of unfavourable Na metal deposition and the limited cell cycle life hamper the application of this battery system at a large scale. Here, we propos...

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Bibliographic Details
Published in:Nature communications 2021-10, Vol.12 (1), p.5786-5786, Article 5786
Main Authors: Qin, Jieqiong, Shi, Haodong, Huang, Kai, Lu, Pengfei, Wen, Pengchao, Xing, Feifei, Yang, Bing, Ye, Mao, Yu, Yan, Wu, Zhong-Shuai
Format: Article
Language:English
Subjects:
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639/4077/4079/891
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Batteries
Cell cycle
Coated electrodes
Coatings
Composite materials
Cycles
Electrochemistry
Energy storage
Graphene
Humanities and Social Sciences
Metals
multidisciplinary
Multilayers
Pollutant deposition
Polypropylene
Science
Science (multidisciplinary)
Separators
Sodium
Storage systems
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Summary:Sodium metal batteries are considered one of the most promising low-cost high-energy-density electrochemical energy storage systems. However, the growth of unfavourable Na metal deposition and the limited cell cycle life hamper the application of this battery system at a large scale. Here, we propose the use of polypropylene separator coated with a composite material comprising polydopamine and multilayer graphene to tackle these issues. The oxygen- and nitrogen- containing moieties as well as the nano- and meso- porous network of the coating allow cycling of Na metal electrodes in symmetric cell configuration for over 2000 h with a stable 4 mV overpotential at 1 mA cm −2 . When tested in full Na || Na 3 V 2 (PO 4 ) 3 coin cell, the coated separator enables the delivery of a stable capacity of about 100 mAh g −1 for 500 cycles (90% capacity retention) at a specific current of 235 mA g −1 and satisfactory rate capability performances (i.e., 75 mAh g −1 at 3.5 A g −1 ). The development of future Na metal batteries relies on the cycling stability of the metallic anode. Here, the authors propose a polypropylene separator functionalized with polydopamine and multilayer graphene to enable stable and prolonged Na metal cell cycling.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-26032-1