锂离子电池材料Li_(1+x)Zn_xMn_(2-x)O_4电化学性质研究  

Electrochemical Properties of Li_(1+x)Zn_xMn_(2-x)O_4 as Cathode Material for Lithium-ion Battery

作　　者：陈宇[1] 张文选[2] 胡福坤[2] 张玉荣[2] 

机构地区：[1]莆田学院环境与生命科学系,福建莆田351100 [2]福州大学化学系,福建福州350002

出　　处：《莆田学院学报》2008年第2期93-97,共5页Journal of putian University

摘　　要：采用溶胶-凝胶法合成了Zn2+取代的锂离子电池正极材料Li1+xZnxMn2-xO4。结构研究结果表明,用这种方法可以在比固相反应低得多的温度下得到单相的尖晶石且制得的材料粒度均匀,粒径大多在150nm左右。半电池循环测试结果表明,起始组成为x=0.06的样品性能最佳,其与锂片组成的半电池在3.0V—4.6V间,以0.10mA/cm2的电流密度进行充放电的首次充、放电容量分别为131.4mAh/g和129.2mAh/g,经35次循环后容量仍保持在100mAh/g。Lithium-rich zinc doped Li1＋xZnxMn2-xO4 as cathode material of lithium ion battery has been synthesized by sol-gel method. X-ray powder diffraction analysis shows that a single spinel phase can be obtained by heating the precursor at lower temperature. TEM image reveals that the sample has perfect morphology. Charge/discharge experiments of Li1＋xZnxMn2-xO4 half cell in 1 M LiPF6/EC＋DEC ＋DMC（1：1：1） electrolyte between 3.0V-4.6V at a rate of 0.10mA/cm^2 show that the sample with initial composition of a：= 0.06 possesses the best performance, its initial charge and discharge capacity reaches up to 131.4mAh/g and 129.2mAh/g respectively, and its capacity retains 100mAh/g after 35th cycles.

关 键 词：锂离子电池 正极材料 溶胶-凝胶法 尖晶石 

分 类 号：O646[理学—物理化学]