LiV_3O_8电极在硫酸锂-水-乙醇电解质中的电化学性能研究(英文)  

Investigations on Electrochemical Characteristics of LiV_(3)O_(8) Electrode in Lithium Sulfate-water-ethanol Electrolytes

作　　者：袁安保[1] 宋维相[1] 

机构地区：[1]上海大学理学院化学系,上海200444

出　　处：《电化学》2006年第3期250-256,共7页Journal of Electrochemistry

摘　　要：应用低温液相反应再经450℃中温锻烧制备LiV3O8活性物质,并用X射线衍射(XRD)分析和扫描电镜(SEM)表征了产物LiV3O8结构、形貌.电化学方法研究LiV3O8电极在硫酸锂-水-乙醇中性电解质溶液中的性能.恒流充放电结果表明,LiV3O8电极的比容量随电解质溶液中乙醇含量的增加而降低,若同时考虑电解质溶液的电导率和电极的稳定性,水/乙醇体积比4∶1最为合适.交流阻抗测试表明,溶液的欧姆电阻以及电极/电解质界面的电荷转移电阻随溶液中乙醇含量的增加而增大;随着充放电循环的进行,电极/电解质界面的电荷转移电阻增大,电极的活性降低.The active material of LiV3O8 prepared using low-temperature pre-reaction in solution followed by intermediate-temperature calcination at 450℃. The product was characterized by X-ray diffraction analysis and scanning electron microscope observation. The performance of LiV3 O8 electrode in neutral lithium sulfate-waterethanol electrolytes was investigated using electrochemical methods. Galvanostatic charge/discharge results indicated that the specific capacity of LiV3O8 electrode decreases with ethanol content increasing in electrolyte. The most appropriate water/ethanol volumetric ratio is 4 ： 1 in terms of conductivity of the electrolyte and stability of the electrode. AC impedance measurements demonstrated that the ohmic resistance of the electrolyte as well as the charge transfer resistance of the electrode/electrolyte interface increases with ethanol content increasing.

关 键 词：LIV3O8 电化学特性 硫酸锂-水-乙醇电解质 

分 类 号：TM910.3[电气工程—电力电子与电力传动]