阴极
普鲁士蓝
X射线光电子能谱
材料科学
钾
X射线吸收光谱法
拉曼光谱
电化学
插层(化学)
吸收光谱法
化学工程
分析化学(期刊)
化学
无机化学
电极
物理化学
光学
工程类
冶金
物理
色谱法
作者
Junyi Dai,Sha Tan,Lifeng Wang,Fangxin Ling,F. F. Duan,Mingze Ma,Yu Shao,Xianhong Rui,Yu Yao,Enyuan Hu,Xiaojun Wu,Chunyang Li,Yan Yu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-10-31
卷期号:17 (21): 20949-20961
被引量:13
标识
DOI:10.1021/acsnano.3c02323
摘要
Prussian blue analogues (PBAs) used as sodium ion battery (SIB) cathodes are usually the focus of attention due to their three-dimensional open frame and high theoretical capacity. Nonetheless, the disadvantages of a low working voltage and inferior structural stability of PBAs prevent their further applications. Herein, we propose constructing the Kx(MnFeCoNiCu)[Fe(CN)6] (HE-K-PBA) cathode by high-entropy and potassium incorporation strategy to simultaneously realize high working voltage and cycling stability. The reaction mechanism of metal cations in HE-K-PBA are revealed by synchrotron radiation X-ray absorption spectroscopy (XAS), ex situ X-ray photoelectron spectroscopy (XPS), and in situ Raman spectra. We also investigate the entropy stabilization mechanism via finite element simulation, demonstrating that HE-K-PBA with small von Mises stress and weak structure strain can significantly mitigate the structural distortion. Benefit from the stable structure and everlasting K+ (de)intercalation, the HE-K-PBA delivers high output voltage (3.46 V), good reversible capacity (120.5 mAh g-1 at 0.01 A g-1), and capacity retention of 90.4% after 1700 cycles at 1.0 A g-1. Moreover, the assembled full cell and all-solid-state batteries with a stable median voltage of 3.29 V over 3000 cycles further demonstrate the application prospects of the HE-K-PBA cathode.
科研通智能强力驱动
Strongly Powered by AbleSci AI