表面镀Al修饰的LiFePO4正极材料电化学特性研究  

Electrochemical Properties Study of LiFePO Cathode Material Surface Modified by Aluminizing

作　　者：王春花 罗姣姣 白国梁 刘娜 卫巍 罗启波 董彦杰 崔晓峰 WANG Chunhua;LUO Jiaojiao;BAI Guoliang;LIU Na;WEIWei;LUO Qibo;DONG Yanjie;CUI Xiaofeng(College of Chemistry and Chemical Engineering,Anqing Normal University,Anqing 246133,China)

机构地区：[1]安庆师范大学化学化工学院,安徽安庆246133

出　　处：《安庆师范大学学报（自然科学版）》2020年第4期62-66,共5页Journal of Anqing Normal University(Natural Science Edition)

基　　金：安徽省自然科学青年基金(1908085QB61);安徽省高校自然科学重点研究项目(KJ2019A0546,KJ2018A0372);省部共建煤炭高效利用与绿色化工国家重点实验室开放基金(2018-K34)。

摘　　要：橄榄石结构的LiFePO4具有廉价环保以及优良的循环性能,是有产业化前景的锂离子电池正极材料,但它的导电性能差离子扩散性弱。为解决问题,采用磁控溅射法在LiFePO4电极极片表面均匀修饰一层纳米尺度铝膜,制备出LiFePO4-Al复合电极材料。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、恒流充放电测试、循环伏安法(CV)等方法对材料结构、形貌及电化学性能进行了表征。研究结果表明,镀铝修饰可以显著提高LiFePO4电极材料的倍率和循环性能。Lithium iron phosphate(LiFePO4) with olivine structure appears in the list of cathode materials for lithium ion batteries because of its good safety performance and low cost. However, its poor conductivity and weak ion diffusivity limit its further development. In this paper, the magnetron sputtering method is used to uniformly modify a layer of nano-scale aluminum film on the surface of LiFePO4 to prepare LiFePO4-Al composite electrode material. The structure, morphology and electrochemical performances of the resulting LiFePO4-Al composites are characterized by X-ray diffraction(XRD), scanning electron microscope(SEM), charge-discharge test and cyclic voltammograms(CV). The results show that the rate and cycle performance of LiFePO4 electrode material modified by aluminizing can be significantly improved.

关 键 词：磁控溅射 LIFEPO4 正极材料 表面修饰 锂离子电池 

分 类 号：G642[文化科学—高等教育学]