镍离子掺杂磷酸亚铁锂的电化学性能  

ELECTROCHEMICAL PERFORMANCE OF NICKLE DOPING LiFePO_4

作　　者：卢阳 童庆松[2] 崔明 

机构地区：[1]珠海鹏辉电池有限公司 [2]福建师范大学化学与材料学院,福建福州350007

出　　处：《华南师范大学学报（自然科学版）》2009年第A02期18-19,30,共3页Journal of South China Normal University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(2008J0144);福建省科技厅资助项目(2009I0007)

摘　　要：采用固相烧结法,合成了一系列橄榄石型LiFe1-xNixPO4/C(x=0,0.02,0.04,0.06)复合正极材料.通过XRD、充放电和TEM等现代手段,研究了样品的物相结构、电化学性能等.充放电测试表明,LiFe0.98Ni0.02PO4/C以0.1 C倍率电流放电时,首次放电容量分别为142.0 mAh/g.样品还表现出很好的倍率性能,当以2 C的倍率放电时,放电容量达到了121.3 mAh/g.结果表明少量Ni离子掺杂可改善LiFePO4的电化学性能.透射电镜表明LiFe0.98Ni0.02PO4/C样品表面包覆了一层大约2.8 nm厚的碳层.LiFe1-x NixPO4/C （x = 0, 0. 02, 0. 04 and 0. 06） composites were prepared using solid -state reaction. The experimental results show that all as - prepared composites have a single phase of orthorhombic olivine - type structure with the Pnmb space group. The LiFe0.98Ni0.02PO4/C composite delivers 142 mAh/g at the 0. 1 C rate for the first cycle. Such composites also show good rate capabilities. When discharged at the 2 C rate the LiFe0.98Ni0.02 PO4/C composite delivers an initial capacity of 121 mAh/g. TEM and HRTEM images indicate that the LiFeo.gs Ni0.02PO4/C grains are coated by a layer of carbon with the thickness about 2. 8 nm.

关 键 词：锂离子电池 正极材料 磷酸亚铁锂 掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]