Preparation of Prussian Blue Submicron Particles with a Pore Structure by Two-Step Optimization for Na-Ion Battery Cathodes

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• 作者：Renjie Chen ; Yongxin Huang ; Man Xie ; Qianyun Zhang ; XiaoXiao Zhang ; Li Li ; Feng Wu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 29, 2016
• 年：2016
• 卷：8
• 期：25
• 页码：16078-16086
• 全文大小：576K
• 年卷期：0
• ISSN：1944-8252

文摘

Traditional Prussian blue (Fe<sub>4sub>[Fe(CN)<sub>6sub>]<sub>3sub>) synthesized by simple rapid precipitation shows poor electrochemical performance because of the presence of vacancies occupied by coordinated water. When the precipitation rate is reduced and polyvinylpyrrolidone K-30 is added as a surface active agent, the as-prepared Prussian blue has fewer vacancies in the crystal structure than in that of traditional Prussian blue. It has a well-defined face-centered-cubic structure, which can provide large channels for Na<sup>+sup> insertion/extraction. The material, synthesized by slow precipitation, has an initial discharge capacity of 113 mA h g<sup>–1sup> and maintains 93 mA h g<sup>–1sup> under a current density of 50 mA g<sup>–1sup> after 150 charge–discharge cycles. After further optimization by a chemical etching method, the complex nanoporous structure of Prussian blue has a high Brunauer–Emmett–Teller surface area and a stable structure to achieve high specific capacity and long cycle life. Surprisingly, the electrode shows an initial discharge capacity of 115 mA h g<sup>–1sup> and a Coulombic efficiency of approximately 100% with capacity retention of 96% after 150 cycles. Experimental results show that Prussian blue can also be used as a cathode for Na-ion batteries.