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

Jieqiong Qin, Haodong Shi, Kai Huang, Pengfei Lu, Pengchao Wen, Feifei Xing, Bing Yang, Mao Ye (), Yan Yu () and Zhong-Shuai Wu ()
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Jieqiong Qin: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Haodong Shi: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Kai Huang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Pengfei Lu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Pengchao Wen: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Feifei Xing: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Bing Yang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Mao Ye: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Yan Yu: University of Science and Technology of China
Zhong-Shuai Wu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract 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 || Na3V2(PO4)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).

Date: 2021
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DOI: 10.1038/s41467-021-26032-1

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