球形3LiF/Fe材料的制备及脱嵌锂性能研究  

Preparation and lithiation/delithiation performance of spherical 3 LiF/Fe material

作　　者：孙俊杰 王良哲 王明霞 林燕 SUN Junjie;WANG Liangzhe;WANG Mingxia;LIN Yan(School of Pharmaceutical and Materials Engineering,Taizhou University,Taizhou Zhejiang 318000,China;State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou Zhejiang 310027,China)

机构地区：[1]台州学院医药化工与材料工程学院,浙江台州318000 [2]浙江大学硅材料国家重点实验室,浙江杭州310027

出　　处：《电源技术》2021年第4期437-439,494,共4页Chinese Journal of Power Sources

基　　金：浙江省自然科学基金(LQ15E010001)。

摘　　要：基于多电子转换反应的FeF3除比容量高(712 mAh/g)的优点外,还具有较高的放电平台(2.742 V),是极具应用前景的高容量锂离子电池正极材料。但此类材料具有动力学性能差,循环寿命短等缺点,且使用过程中需要含Li的负极材料与之配对,这极大地限制了此类材料的应用。采用超声喷雾分解法(USP)一步合成了3 LiF/Fe复合材料,并研究了其可逆脱嵌锂性能。通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)、透射电子显微镜法(TEM)和拉曼光谱等方法对材料的结构进行了表征,并对其进行了充放电容量测试。结果表明,前驱体溶液中添加蔗糖,炉温为700℃时,可一步得到物相相对较纯的球形3 LiF/Fe材料;在20 mA/g的电流密度下,材料的放电平台约为2.8 V,比容量为130 mAh/g。FeF3 material based on multi-electron conversion reaction is a promising cathode material for high-capacity lithium-ion batteries,because it not only has high specific capacity(712 mAh/g),but also has a high discharge platform(2.742 V).However,this kind of material has the disadvantages of poor kinetic performance and short cycling life.In the process of use,it should be paired with the anode material containing Li,which greatly limits its application.The 3 LiF/Fe material was synthesized in one step by the ultrasonic spray pyrolysis(USP)and its lithiation/delithiation performance was studied.The structure of the material was characterized by XRD,SEM,TEM and Raman spectra,and the charge/discharge capacity was tested.The results show that the spherical 3 LiF/Fe material with relatively pure phase can be obtained by adding sucrose into the precursor solution at 700℃.At the current density of 20 mA/g,the discharge platform is about 2.8 V and the specific capacity is about 130 mAh/g.

关 键 词：锂离子电池 球形3 LiF/Fe 超声喷雾分解法 容量 

分 类 号：TM912.9[电气工程—电力电子与电力传动]