采用新颖喷墨打印技术制备的薄膜LiCoO_2电极及其电化学性能  

Thin Film LiCoO_2 Cathode Prepared by Using Ink-jet Printing Technique and Its Electrochemical Properties

作　　者：赵尧敏[1] 许娟[2] 刘玲[2] 杨洁[2] 江志裕[2] 

机构地区：[1]中原工学院材料与化工学院,郑州450007 [2]复旦大学化学系上海市分子催化与新材料重点实验室,上海200433

出　　处：《高等学校化学学报》2007年第6期1122-1125,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20333040)资助

摘　　要：采用喷墨打印技术制备了LiCoO2薄膜电极.用X射线衍射、扫描电镜(SEM)、循环伏安和恒电流充放电试验对薄膜电极进行结构表征和电化学性能测试.SEM结果表明,所制备的薄膜电极表面粒子分布均匀,厚度约为1·27μm.经过轻微热处理(450℃,30min)的薄膜LiCoO2电极呈现出稳定的充放电循环性能.当以20μA/cm2进行充放电时,第50次循环容量保持率约为首次放电容量(81mA·h/g)的87%,10次循环后的充放电过程的充放电效率均接近100%.Thin film LiCoO2 electrodes were successfully prepared with a novel facile and low-cost computer ink-jet printing technique. For preparing the stable colloid “ink”, wet ball-milling was employed to stabilize the nano LiCoO2 particles and conducting agent acetylene black （AB） while two kinds of polymeric hyper dis-persants CH10B and CH12B were used, respectively. Nano LiCoO2 particles were synthesized through the self-assembly method using triblock copolymer P123 as a template. The morphology, crystal structure and electrochenlical performance of jet printing LiCoO2 thin film electrodes were investigated in detail via SEM, XRD, cyclic voltammograms（CV） and galvanostatic charge-discharge measurements. It was determined that the average thickness of the as-printed thin-film LiCoO2 electrode was about 1.27 m. The CV curves show that the heat treatment was benefit for improving the electrochemical properties of electrode. After a slight annealing process at 450℃ for 30 min, the thin film electrode presented a good reversible CV behavior. In the cycling process with constant charge-discharge current 20 A/cm^2 within the potential range of 3.0-4.2 V （us. Li^＋/Li）, the initial discharge capacity of thin film LiCoO2 electrode was 81 mA·h/g, and after 50 cycles it remained 87%. After 10 cycles the charge-discharge efficiency reached near 100%.

关 键 词：计算机喷墨打印 薄膜电极 锂离子电池 LICOO2 

分 类 号：O643[理学—物理化学] O657.3[理学—化学]