普鲁士蓝
电化学
电极
电解质
阴极
材料科学
离子
钠
蚀刻(微加工)
化学工程
扩散
纳米技术
化学
冶金
有机化学
物理化学
工程类
物理
图层(电子)
热力学
作者
Jiajia Han,Yanan Hu,Qinghao Han,Xingjun Liu,Cuiping Wang
标识
DOI:10.1016/j.jallcom.2023.169928
摘要
To address the issues of low specific capacity and poor cycle performance of Prussian blue analogues as cathode materials for sodium-ion batteries, this work performed surface etching modification on the synthesized Fe0.8Co0.2HCF with a regular cubic structure and optimized its electrochemical performance. The resulting grooved structure further enhanced the electrode material significantly. The results show that the etched sample delivers a discharge capacity of 153.3 mAh/g at 0.5 C and retains 83.3% after 200 cycles at 2 C. When the rate returns from 16 C to 0.5 C, the discharge capacity can be maintained at about 90.7%. Based on experimental analysis and theoretical calculation, the improved electrochemical performance of the etched sample is mainly attributed to the following three aspects: (1) fast diffusion of Na+; (2) reduced water content; (3) large contact area between electrode and electrolyte.
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