【作者】 尹天平； 李娟；

【Author】 YIN Tian-ping~1 LI Juan~(1,2) (1.Chemistry and Chemical Technology Academiy of Xinjiang University,Urumqi 830046,China;2.School of Science,Xi’an Jiaotong University,Xi’an 710049,China)

【机构】 新疆大学化学与化工学院； 西安交通大学理学院；

【摘要】 以LiOH·H₂O、NH₄VO₃和NH₄H₂PO₄为原料采用微波法合成了LiV₃O_7.9（PO₄）_0.1。利用X射线衍射（XRD）、扫描电镜（SEM）对材料的晶型结构和形貌进行了表征。利用恒电流充放电和交流阻抗测试技术对材料进行电化学性能测试。结果表明,PO₄^3-未改变LiV₃O₈层状结构,掺杂样品呈不规则棒状形貌。与纯LiV₃O₈相比,LiV₃O_7.9（PO₄）_0.1不仅在首次放电容量由234mAh/g提高到278mAh/g,而且还表现出很好的稳定性和循环性能,经过50次循环以后LiV₃O_7.9（PO₄）_0.1容量仍然能保持89%。更多还原

【Abstract】 Li-ion batteries cathode material LiV₃O_7.9（PO₄）_0.1 was synthesized by microwave method with LiOH, H₂O、NH₄VO₃ and NH₄H₂PO₄ as raw materials.The morphology and microstructure of the samples were char- acterized by X-ray diffraction（XRD） and scanning electron microsopy（SEM）.Its electrochemical behavior as a cathode material for rechargeable li-ion batteries was studied by galvanostatic charge-discharge and A.C.Impe- dence tests.Compared with net LiV₃O₈,The results showed that LiV₃O_7.9 （PO₄）_0.1 not only in the first dis- charge capacity increases from 234 mAh/g to 278 mAh/g,but also shows good structure stability and cycle per- formance,its capacity can still maintain the 89 percent after 50 cycles.更多还原