In Situ Carbon Coating Induced by Molecular Intercalation for Fabricating Advanced High F-Content KVPO4F Cathode Toward Potassium-Ion Batteries

IF 1.5 4区 化学 Q4 CHEMISTRY, PHYSICAL
Yu Dong, Wanyue Sheng, Mingqi Li, Qiwen Ran
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Abstract

Although potassium (K) vanadyl phosphate fluoride (KVPO₄F) is considered one of the most promising cathode materials for K-ion batteries, its practical application is hindered by poor electronic conductivity and fluorine (F) loss during the synthesis process. In this work, a novel synthetic route is designed to realize the advanced KVPO₄F cathode material (denoted as KVPO4F@C) by adopting in situ carbon coating approach initiated by isobutanol molecular intercalation, delivering two distinct characteristics of high F-containing and limited particle growth. On one hand, the as-generated in situ carbon coating layer enhances the electronic conductivity of KVPO₄F material and prevents the particle agglomeration during the calcination process. On the other hand, the as-introduced V–F–C bonds at the KVPO₄F/C interface realizes a high F-containing of KVPO4F@C cathode material without large-scale F loss. As a result, the KVPO4F@C cathode retains a high discharge capacity of 63.94 mAh g⁻¹ after 100 cycles at 2C as well as superior rate performance. This study highlights the critical role of the pathway to realize carbon coating approach in enhancing the electrochemical performance of KVPO4F cathode.

分子插层诱导原位碳涂层制备高含氟KVPO4F钾离子电池阴极
虽然钾(K)钒酰磷酸氟(KVPO₄F)被认为是最有前途的钾离子电池正极材料之一,但其实际应用受到电子导电性差和合成过程中氟(F)损失的阻碍。本文设计了一种新的合成路线,采用异丁醇分子插层引发的原位碳包覆方法,实现了先进的KVPO₄F正极材料(表示为KVPO4F@C),具有高含F和限制颗粒生长的两个明显特点。一方面,原位生成的碳包覆层提高了KVPO₄F材料的电子导电性,防止了煅烧过程中颗粒团聚。另一方面,引入的V-F-C键在KVPO₄F/C界面上实现了KVPO4F@C阴极材料的高含F量而没有大规模的F损失。因此,KVPO4F@C阴极在2C下循环100次后保持了63.94 mAh g⁻¹的高放电容量,并具有优异的倍率性能。本研究强调了碳包覆途径在提高KVPO4F阴极电化学性能中的关键作用。
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来源期刊
CiteScore
3.30
自引率
6.70%
发文量
74
审稿时长
3 months
期刊介绍: As the leading archival journal devoted exclusively to chemical kinetics, the International Journal of Chemical Kinetics publishes original research in gas phase, condensed phase, and polymer reaction kinetics, as well as biochemical and surface kinetics. The Journal seeks to be the primary archive for careful experimental measurements of reaction kinetics, in both simple and complex systems. The Journal also presents new developments in applied theoretical kinetics and publishes large kinetic models, and the algorithms and estimates used in these models. These include methods for handling the large reaction networks important in biochemistry, catalysis, and free radical chemistry. In addition, the Journal explores such topics as the quantitative relationships between molecular structure and chemical reactivity, organic/inorganic chemistry and reaction mechanisms, and the reactive chemistry at interfaces.
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