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<p>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<sub>2</sub>), and vanadium pentoxide (V<sub>2</sub>O<sub>5</sub>). 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<sub>x</sub>Mn<sub>y</sub>[Fe(CN)<sub>6</sub>]<sub>z</sub>·nH<sub>2</sub>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.</p>

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The construction of a new type of rechargeable Cl− aqueous ion battery

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Mingyang Cao,
  • Mingqiang Li,
  • Ning Wang,
  • Yanheng Yin,
  • Jun Chen

摘要

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 (MnO2), and vanadium pentoxide (V2O5). 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 VxMny[Fe(CN)6]z·nH2O 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.