新型可充电氯离子水系电池的构建

Chloride-ion batteries (CIBs) exhibit high theoretical volumetric energy density and utilize abundant chlorine-containing precursors, rendering them promising candidates for next-generation energy storage systems. However, their practical implementation is hindered by poor cycling stability and structural degradation of electrode materials. This study developed a composite cathode material integrating Prussian blue analogs, manganese dioxide (MnO 2 ), and vanadium pentoxide (V 2 O 5 ). This cathode was paired with an aqueous alkaline electrolyte to assemble the CIB system. The optimized battery delivered a Maximum specific capacity of 160 mAh/g and demonstrated exceptional cycling stability, maintaining 130 mAh/g after 1100 cycles following an initial activation process. Mechanistic investigations through comparative electrochemical testing and material characterization revealed the in situ formation of a ternary transition metal hexacyanoferrate phase with the approximate formula V x Mn y [Fe(CN) 6 ] z ·nH 2 O during cycling. This crystalline phase exhibited enhanced structural stability and facilitated three-dimensional electron transport pathways. This work presents a viable strategy for developing high-performance rechargeable chloride-ion batteries through rational electrode design.