锂离子电池纳米电极薄膜的喷墨打印研究

Inkjet-printed thin films of nanostructured elctrode materials for lithium-ion batteries

用喷墨打印的方法制作了锂离子电池纳米结构正负极材料的电极薄膜.以纳米颗粒状Li4Ti5O12负极和LiFePO4正极材料为例,研究了Tween-80和FC-4430两种表面活性剂对电极材料墨水的影响.研究表明,电极材料墨水是喷墨打印制备锂离子电池膜片的关键,添加剂成分对电池材料墨水性能的电化学稳定性、分散性和可喷性有较大影响.与Tween-80相比,利用FC-4430制备的Li4Ti5O12墨水和LiFePO4墨水打印的电极膜片表现出较好的循环性能和库伦效率.其原因是由于全氟类表面活性剂(如FC-4430)具有较好的电化学稳定性.

Nanostructured cathode and anode thin films for lithium-ion batteries were fabricated through ink-jet printing method. Take Li4TisO12 anode material and LiFePO4 cathode material as examples, we investigated the influence of surfactants such as Tween-80 and FC-4430 on the inks of electrode materials. The results suggest that electrode material ink plays a key role in ink-jet printing process. Additives influence ink＇s dispersing stability, sprayed performance as well as electrochemical performance. Both Tween-80 and FC-4430 can improve the dispersing stability and sprayed performance of electrode slurry. However, compared with Tween-80, the electrode material ink with FC-4430 as additives has good cycling performance and high Coulombic efficiency, which could be attributed to the good electrochemical stability of perfluorinated surfactants （i.e., FC-4430）.