摘要
选用六水合硝酸铈作为Ce源,利用溶胶凝胶结合离子交换法,成功合成了LiCexEu1-xTiO4,并利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、循环伏安(CV)和充放电循环测试等方法对LiCexEu1-xTiO4的结构、形貌和电化学性能方面做了系统地表征。研究结果表明,与未掺杂的LiEuTiO4相比,在晶格中引入Ce3+能显著改善材料的动力学性能,这可能与Ce-Eu-Ti协同效应有关。这种协同效应表现为晶格参数的复杂变化导致Ti和Ce处于混合价态。其中LiEu0.995Ce0.005TiO4的电化学性能最好。
Using Ceriumnitrate hexahydrate as Ce source,LiCexEu1-xTiO4 was synthesized by sol-gel and ion exchange method.The structural,morphological and electrochemical properties of LiCexEu1-xTiO4 were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),cyclic voltammogram(CV),and charge-discharge cycling tests.The results show that the introduction of Ce3+into the lattice can significantly improve the dynamic properties of the material,which is probably related to Ce-Eu-Ti synergistic effect.This synergistic effect appears as the complicated modulations in terms of lattice parameters and resulted in Ti and Ce in mixed valences.LiEu0.995Ce0.005TiO4 shows the best electrochemical performances.
作者
朱德澄
陈亦新
季崇星
朱贤雨
李德成
ZHU De-Cheng;CHEN Yi-Xin;JI Chong-Xing;ZHU Xian-Yu;LI De-Cheng(College of Energy,Soochow University,Suzhou,Jiangsu 215006,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2020年第10期1925-1933,共9页
Chinese Journal of Inorganic Chemistry
关键词
锂离子电池
负极材料
钙钛矿结构
离子交换法
电化学性能
lithium-ion battery
anode material
perovskite structure
ion-exchange method
electrochemical performance
