反应物分散条件对Li_(1+x)V_3O_8电化学性能的影响  

Different Reactant Dispersion on the Electrochemical Performance of Li_(1+x)V_3O_8

作　　者：刘永梅[1] 郭永榔[1] 

机构地区：[1]福州大学化学化工学院,福州350108

出　　处：《应用化学》2009年第10期1236-1240,共5页Chinese Journal of Applied Chemistry

摘　　要：以Li2CO3和NH4VO3为原料,在不同条件下合成了锂离子电池正极材料用Li1+xV3O8。研究了反应物的分散条件和煅烧温度对产物晶型结构、形貌及电化学性能的影响。XRD、IR和SEM结果表明,用超声波在无水乙醇中分散反应物得到的前驱体于550℃下煅烧,所得产物Li1+xV3O8结晶度低、粒径小、形貌均匀。充放电、循环伏安等结果表明,该材料在充放电过程中极化低、嵌脱锂位置多、循环稳定性好。在0.5C放电条件下,第2次循环放电容量达到268mA·h/g,100次循环后容量仍保持210mA·h/g以上。The anodic material of Li1＋x V3O8 was synthesized with Li2CO3 and NHaVO3 as the reactants under different conditions. The effects of the reactant dispersion and the calcining temperature on the structure, morphology and electrochemical properties of the products were investigated. XRD, IR and SEM experiments show that the sample synthesized at 550℃ from the precursor obtained with ultrasonically treating reactants in anhydrous ethanol has low crystallinity, small grain size and homogeneous morphology. And it has low polarization, more lithium insertion/extraction sites and good cyclability. Its discharge capacity reaches 268 mA·h/g in the 2nd cycle at a discharge rate of 0. 5 C and still retains 210 mA·h/g after 100 cycles.

关 键 词：锂离子电池 LI1+XV3O8 超声波分散 固相合成 

分 类 号：O646[理学—物理化学]