普鲁士蓝
阴极
阳极
电池(电)
材料科学
纳米颗粒
化学工程
钾
纳米技术
石墨
离子
储能
扩散
电化学
化学
电极
复合材料
冶金
有机化学
功率(物理)
物理
物理化学
量子力学
工程类
热力学
作者
An Li,Yuehua Man,Jiaying Liao,Liping Duan,Xiulei Ji,Xiaosi Zhou
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-10-17
卷期号:23 (21): 10066-10073
被引量:34
标识
DOI:10.1021/acs.nanolett.3c03558
摘要
Prussian white (PW) is considered as a promising cathode material for potassium-ion batteries (KIBs) due to its low cost and high theoretical capacity. However, the high water content and structural defects and the strict synthesis conditions of PW lead to its unsatisfactory cycling performance and low specific capacity, hindering its practical applications. Herein, a template-engaged reduction method is proposed, using MIL-88B(Fe) as a self-template and KI as the reducing agent to prepare K-rich PW with low defects and water content. Furthermore, the hierarchical porous spindle-like morphology can be inherited from the precursor, furnishing sufficient active sites and reducing the ion diffusion path. Consequently, when applied as a KIB cathode material, spindle-like PW (K1.72Fe[Fe(CN)6]0.96·0.342H2O) manifested remarkable potassium storage properties. Notably, a full cell assembled by the spindle-like PW cathode and graphite anode exhibited a large energy density of ∼216.7 Wh kg-1, demonstrating its huge potential for energy storage systems.
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