摘要
采用高温固相反应法,将MoO_(3)与Ni 0.9 Mn_(0.1)(OH)2前驱体、LiOH·H_(2)O一步混合焙烧,得到了MoO_(3)包覆的LiNi_(0.9) Mn_(0.1) O_(2)。利用X-射线衍射(XRD)、扫描电镜(SEM)、X-射线光电子能谱(XPS)和恒流充放电等方法对包覆和未包覆的材料进行结构表征和电化学性能对照分析。结果表明:MoO_(3)包覆没有改变电极材料的晶体结构,MoO_(3)(0.5%,物质的量分数,下同)包覆量的材料性能最好。在3.0~4.4 V电压窗口下,0.1 C首次放电比容量为182.1 mAh·g^(-1),循环50次后容量保持率为91.8%,优于未包覆的材料。
In this paper,the high temperature solid-phase reaction method is used,and MoO_(3) is mixed with Ni 0.9 Mn_(0.1)(OH)2 precursor and LiOH·H_(2)O in one step to obtain MoO_(3)-coated LiNi_(0.9) Mn_(0.1) O_(2).The structure characterization and electrochemical performance comparison analysis of the coated and uncoated materials are carried out by means of X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS)and constant current charge-discharge.The results show that the MoO_(3) coating does not change the crystal structure of the electrode material,and the material coated with 0.5%(mole faction,same below)MoO_(3) has the best performance.Under the voltage window of 3.0~4.4 V,the first discharge specific capacity of 0.1 C is 182.1 mAh·g^(-1),and the capacity retention rate after fifth cycles is 91.8%,which is better than the uncoated material.
作者
郭宇萱
王昊
瞿美臻
彭工厂
GUO Yuxuan;WANG Hao;QU Meizhen;PENG Gongchang(Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu 610041,China;University of Chinese Academy of Sciences,Beijing 100039,China)
出处
《合成化学》
CAS
2023年第4期296-303,共8页
Chinese Journal of Synthetic Chemistry
基金
国家自然科学基金资助项目(B050803)。
