Zeng Yunshu, Wang Yuyuan, Huang Zhen, Luo Hongyu, Tang Han, Dong Shijie, Luo Ping
Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, Hubei Provincial Key Laboratory of Green Materials for Light Industry, School of Materials and Chemical Engineering, Hubei University of Technology, 430068, Wuhan, People's Republic of China.
Hubei Longzhong Laboratory, 441000, Xiangyang, Hubei, People's Republic of China.
Nanotechnology. 2023 Sep 5;34(47). doi: 10.1088/1361-6528/acf224.
Prussian blue analogues (PBAs) are reliable and promising cathode materials for aqueous sodium-ion batteries (ASIBs) owing to their open three-dimensional frameworks, outstanding stability, and low production costs. However, PBAs containing only a single type of transition-metal ion often have limited charge-storage capacities in aqueous systems. This study reports the first example of KNiCo[Fe(CN)]·2.04HO nanoparticles (Ni/Co-PBA) being used as a high-capacity cathode material for ASIBs. Owing to multi-electron redox reactions involving Co and Fe ions, Ni/Co-PBA has an initial capacity of 65 mAh gand a capacity retention rate of 80% after 1000 cycles at 1.0 A g, indicating its outstanding cycle performance and capacity retention. Ex-situ x-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and the galvanostatic intermittent titration technique were used to analyze the redox mechanisms and kinetics of Ni/Co-PBA. Ni/Co-PBA-based ASIBs are among the most promising energy-storage technologies for large-scale fixed energy-storage systems because of their outstanding electrochemical performance, low costs, and high efficiency.
普鲁士蓝类似物（PBAs）因其开放的三维框架、出色的稳定性和较低的生产成本，是用于水系钠离子电池（ASIBs）的可靠且有前景的阴极材料。然而，仅包含单一类型过渡金属离子的PBAs在水系体系中通常具有有限的电荷存储容量。本研究报道了首例将KNiCo[Fe(CN)]·2.04HO纳米颗粒（Ni/Co-PBA）用作ASIBs的高容量阴极材料。由于涉及Co和Fe离子的多电子氧化还原反应，Ni/Co-PBA在1.0 A g下的初始容量为65 mAh g，在1000次循环后的容量保持率为80%，表明其具有出色的循环性能和容量保持能力。采用非原位X射线衍射光谱、傅里叶变换红外光谱、X射线光电子能谱、循环伏安法、电化学阻抗谱和恒电流间歇滴定技术来分析Ni/Co-PBA的氧化还原机制和动力学。基于Ni/Co-PBA的ASIBs因其出色的电化学性能、低成本和高效率，是大规模固定储能系统最有前景的储能技术之一。
