锂离子电池正极材料锂钒氧的制备及表征  

Synthesis and Performance of Cathode Material Li_(1+x)V_3O_8 for Lithium Ion Battery

作　　者：刘丽英[1] 田彦文[2] 

机构地区：[1]广东工业大学材料与能源学院,广东广州518006 [2]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《广东化工》2012年第3期16-18,共3页Guangdong Chemical Industry

基　　金：广东省高校优秀青年创新人才培育项目(LYM09061)

摘　　要：以Li2CO3和V2O5为原料,采用固相法制备了锂离子电池正极材料Li1+xV3O8,并通过XRD、SEM、粉末微电极循环伏安、恒流充放电及交流阻抗等测试手段对其物理性能和电化学性能进行了表征。结果表明:所合成产物呈棒状,衍射特征峰与LiV3O8标准谱图基本一致,为单一物相,层状结构。产物具有较好的可逆性,初始容量为238.7 mAh.g-1,15次循环容量衰减至201.6 mAh.g-1,容量保持率为84.46%。粉末微电极循环伏安结果表明:Li+的嵌入脱出过程机理不同,嵌入是一个多相转变过程。计算得到材料的电导率为2.74×10-5 S.cm-1。The layered Li1＋xV308 was synthesized by a solid-state reaction method. XRD, SEM, cyclic voltammograms, galvanostatic charge-discharge, a.c. impedance tests had been carried out to characterize physical and electrochemical performances. Results indicated that synthesized materials have pure phase and their diffraction peaks are consistent with standard patterns of Li1＋xV3O8 well. With regular rectangular appearance, Lil＋xV308 had good reversibility, first discharge capacity reached 238.7 mAh-g^-1, and specific capacity remained 201.6 mAh-g^-1 after 15 cycles. Charge and discharge mechanisms are different： charge process experiences single phase change, yet discharge process experiences multiphase changes. Calculated conductivity was 2.74×10^-5S.cm^-1

关 键 词：锂离子电池 正极材料 LI1+XV3O8 粉末微电极 循环伏安 电导率 

分 类 号：TQ[化学工程]