基于TiO_2纳米管的三维LiFePO_4正极材料的制备及其电化学性能

Preparation and electrochemical performance of 3-DLiFePO_4 cathode materialsbased on TiO_2 nanotubes

本文用TiO_2纳米管阵列作为薄膜锂离子电池的三维模板,通过磁控溅射在TiO_2纳米管上沉积LiFePO_4薄膜,制备出了具有三维结构的LiFePO_4薄膜.结果表明,这种结构的电池不仅增大了LiFePO_4与电解质的接触面积、提高了正极材料的利用率,还有效地缩短了锂离子的迁移路径、弥补了锂离子扩散率低的缺陷,从而改善了电极材料的动力学性能.

In this paper,the LiFePO 4 thin films based on three-dimensional(3-D)TiO 2 nanotubes were prepared by radio frequency(RF)magnetron sputtering method.The results show that the contact area between LiFePO 4film and the electrolyteand the utilization efficiency of the cathode material increase with the help of this 3-D structure.Meanwhile,it can also effectively shorten the migration path of lithium ions,and make up for the deficiency of the low lithium ion diffusion rate.Therefore,the dynamics properties of the electrode materials could be enhanced.