Layered Birnessite Cathode with a Displacement/Intercalation Mechanism for High-Performance Aqueous Zinc-Ion Batteries.

ABSTRACT: Mn-based rechargeable aqueous zinc-ion batteries (ZIBs) are highly promising because of their high operating voltages, attractive energy densities, and eco-friendliness. However, the electrochemical performances of Mn-based cathodes usually suffer from their serious structure transformation upon charge/discharge cycling. Herein, we report a layered sodium-ion/crystal water co-intercalated Birnessite cathode with the formula of Na_0.55Mn₂O₄·0.57H₂O (NMOH) for high-performance aqueous ZIBs. A displacement/intercalation electrochemical mechanism was confirmed in the Mn-based cathode for the first time. Na⁺ and crystal water enlarge the interlayer distance to enhance the insertion of Zn²⁺, and some sodium ions are replaced with Z

SUBMITTER: Zhai XZ 

PROVIDER: S-EPMC7770783 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature