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

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 sepa

SUBMITTER: Qin J 

PROVIDER: S-EPMC8486844 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature