Luo Yu, Yang Lingxiao, Liu Qing, Yan Youwei
State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
R Soc Open Sci. 2021 Nov 17;8(11):211092. doi: 10.1098/rsos.211092. eCollection 2021 Nov.
Prussian blue (PB) has great potential for use as a sodium cathode material owing to its high working potential and cube frame structure. Herein, this work reports a two-step method to synthesize PB with ascorbic acid as the ball-milling additive, which improves the electrochemical rate performance of PB during the traditional co-precipitation method. The obtained PB sample exhibited a superior specific capability (113.3 mAh g even at 20 C, 1 C = 170 mA g) and a specific capacity retention of 84.8% after 100 cycles at 1 C rate. In order to enhance the cycling performance of the PB, an polyaniline coating strategy was employed in which aniline was added into the electrolyte and polymerized under electrochemical conditions. The coated anode exhibited a high specific capacity retention of 62.7% after 500 cycles, which is significantly higher than that of the non-coated sample, which only remains 40.1% after 500 cycles. This development has shown a great potential as a low-cost, high-performance and environment-friendly technology for large-scale industrial application of PB.
普鲁士蓝（PB）因其高工作电位和立方框架结构而具有作为钠阴极材料的巨大潜力。在此，本工作报道了一种以抗坏血酸作为球磨添加剂合成PB的两步法，该方法改善了PB在传统共沉淀法中的电化学倍率性能。所获得的PB样品表现出优异的比容量（即使在20C时也为113.3 mAh g，1C = 170 mA g），并且在1C倍率下循环100次后比容量保持率为84.8%。为了提高PB的循环性能，采用了聚苯胺涂层策略，即将苯胺添加到电解液中并在电化学条件下聚合。涂覆后的阳极在500次循环后表现出62.7%的高比容量保持率，这明显高于未涂覆样品，未涂覆样品在500次循环后仅保留40.1%。这一进展显示出作为一种低成本、高性能且环境友好的技术在PB大规模工业应用方面的巨大潜力。
