广州化学2025，Vol.50Issue(2)：45-51,7.DOI:10.16560/j.cnki.gzhx.20250207
碳包覆KTiOPO4单晶材料的结构、形貌及储钾性能
Structure,Morphology and Potassium-ion Storage Properties of Carbon-coated KTiOPC4 Single Crystal
摘要
Abstract
This paper will take KTiOPC4 as the research object to solve the key problems of its poor electron conductivity and low potassium storage performance.Polyvinyl pyrrolidone(PVP)is used as a carbon source.Submicron carbon-coated KTiOPO4 single-crystal composites were prepared using ball-milling-assisted solid-phase sintering to improve the electron conductivity and electrochemical properties of KTiOPO4.The structural morphology and elemental composition of carbon-coated KTiOPC4 single-crystal composites are studied using X-ray diffraction,scanning and transmission electron microscopy,X-ray photoelectron spectroscopy,and other modern analytical methods.The electrochemical potassium-ion storage performance of carbon-coated KTiOPO4 composite material prepared at different carbonization temperatures was studied within the electrolyte of 5.0 M KFSI in DIGLYME.The results showed that the composites prepared at 550℃(KTOP-PC-550)exhibited the best electrochemical properties.After being cycled 500 times at the current density of 1 A/g,the discharge capacity of the KTOP-PC-550 electrode is still maintained at 141.5 mAh/g,the capacity retention rate is 95.2％,the Coulomb efficiency is always maintained above 99％,and the cycle performance is improved by 73.9％compared with Pure KTOP material.关键词
钾离子电池/聚阴离子钛基磷酸盐/负极材料/磷酸氧钛钾/碳包覆Key words
potassium-ion battery/polyanionic titanyl phosphate/anode material/potassium titanium oxide phosphate/carbon coating分类
化学工程引用本文复制引用
金苏,柏玲,李子全,黄镇东..碳包覆KTiOPO4单晶材料的结构、形貌及储钾性能[J].广州化学,2025,50(2):45-51,7.基金项目
国家自然科学基金面上项目(52277219) （52277219）
