Scholarlink

<p>Alkali-metal-rich Prussian blue analogues (PBAs) with low symmetry structure have attracted growing interest for the development of high-performance cathode materials of Na/K-ion batteries. In this study, the K-rich K<sub>2</sub>Cu[Fe(CN)<sub>6</sub>] (KCuHCF-T) in triclinic phase has been synthesized by a facile co-precipitation reaction. It reveals that the chelating agent K<sub>2</sub>EDTA plays a key role in controlling the lattice symmetry of K<sub>2</sub>Cu[Fe(CN)<sub>6</sub>]. When tested as cathode material for Na-ion batteries, the K-rich triclinic KCuHCF-T with a negligible content of [Fe(CN)<sub>6</sub>]<sup>4−</sup> vacancy and interstitial water delivers much higher reversible capacity and rate capability compared to the cubic phase counterpart. Moreover, the KCuHCF-T cathode enables an excellent capacity retention of 95.1% over 3000 cycles at 0.5 A g<sup>−1</sup>. The good long-term stability can be ascribed to the pillar effect of K<sup>+</sup> ions that can stabilize the framework structure. The results provide valuable information on the electrochemical Na-storage behavior of the alkali-metal-rich PBAs.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

K-rich potassium copper hexacyanoferrate as a stable cathode material for sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年10月2日

查看全文
  • Hai-Ting Lv,
  • Yan-Yan Li,
  • Qiong Liu,
  • Kangzhe Cao,
  • Yang Fan

摘要

Alkali-metal-rich Prussian blue analogues (PBAs) with low symmetry structure have attracted growing interest for the development of high-performance cathode materials of Na/K-ion batteries. In this study, the K-rich K2Cu[Fe(CN)6] (KCuHCF-T) in triclinic phase has been synthesized by a facile co-precipitation reaction. It reveals that the chelating agent K2EDTA plays a key role in controlling the lattice symmetry of K2Cu[Fe(CN)6]. When tested as cathode material for Na-ion batteries, the K-rich triclinic KCuHCF-T with a negligible content of [Fe(CN)6]4− vacancy and interstitial water delivers much higher reversible capacity and rate capability compared to the cubic phase counterpart. Moreover, the KCuHCF-T cathode enables an excellent capacity retention of 95.1% over 3000 cycles at 0.5 A g−1. The good long-term stability can be ascribed to the pillar effect of K+ ions that can stabilize the framework structure. The results provide valuable information on the electrochemical Na-storage behavior of the alkali-metal-rich PBAs.