铜锌锡硫正极全固态薄膜锂离子电池的研究

Research on Cu_2ZnSnS_4 Cathode for All-Solid-State Thin Film Lithium Ion Batteries

采用铜锌锡硫(CZTS)四元硫化物材料作为全固态薄膜锂离子电池(TFLB)的正极功能层。通过磁控溅射及硫化工艺制备了CZTS多晶薄膜,并经过组分调控及硫化工艺控制等方案,提高了CZTS正极薄膜的电子导电性。此外,通过引入疏松的微观结构,抑制了由充放电过程中的体积膨胀所导致的容量衰减,提升了TFLB循环性能。所制得的TFLB结构为玻璃/Mo/CZTS/LiPON/Li,首圈放电容量高达200μAh·cm^(-2)·μm^(-1)(482 mAh·g^(-1)),放电平台约为1.1 V。

Cu2ZnSnS4 （ CZTS） thin films were fabricated as the cathode layers for all- solid-state thin film lithium batteries （TFLB）. The CZTS thin films were deposited by magnetic sputtering, followed by a sulfuration process. The electronic conductivity of CZTS was improved by the controlling of component and sulfuration process. Moreover, the capacity degeneration which is caused by volume expansion in charge-discharge process was inhibited by introducing a loose microstructure, leading to a improvement of the TFLB cyclic performance. The TFLB with a structure of glass /Mo/CZTS/LiPON/Li show the first cycle discharge capacity is as high as 200 200μAh·cm^（-2）·μm^（-1）（482 mAh·g^（-1））, with the discharge plant of 1.1 V.