High-Energy and High-Power Pseudocapacitor-Battery Hybrid Sodium-Ion Capacitor with Na⁺ Intercalation Pseudocapacitance Anode.

ABSTRACT: High-performance and low-cost sodium-ion capacitors (SICs) show tremendous potential applications in public transport and grid energy storage. However, conventional SICs are limited by the low specific capacity, poor rate capability, and low initial coulombic efficiency (ICE) of anode materials. Herein, we report layered iron vanadate (Fe₅V₁₅O₃₉ (OH)₉·9H₂O) ultrathin nanosheets with a thickness of ~ 2.2 nm (FeVO UNSs) as a novel anode for rapid and reversible sodium-ion storage. According to in situ synchrotron X-ray diffractions and electrochemical analysis, the storage mechanism of FeVO UNSs anode is Na⁺ intercalation pseudocapacitance under a safe potential window. The FeVO UNSs anode delivers high ICE (93.86%), high reve

SUBMITTER: Wei Q 

PROVIDER: S-EPMC8187546 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature