Anisotropic semi-aligned PAN@PVdF-HFP separator for Li-ion batteries
Qiuhong Liu, Wenwu Jiang, Weizheng Lu, Yufan Mei, Fakang He, Minhui Zhang, Yin Liu, Yunqing Chen, Jinfeng Peng, Yanhuai Ding
Abstract
Abstract Compared with the common electrospun nanofibers, the alignment of the nanofibers exhibits interesting anisotropic mechanical properties and structural stability. In this paper, semi-aligned PAN@PVdF-HFP nanofiber separators were prepared by a modified electrospinning method. The composite separators exhibit anisotropic mechanical properties and enhanced electrochemical performance compared with electrospun PAN films. The PAN@PVdF-HFP nanofiber separator can deliver an ionic conductivity of 1.2 mSċcm −1 with electrochemical stability up to 5.0 V. The LiFePO 4 /Li cell with semi-aligned PAN@PVdF-HFP separator shows excellent cycling performance, good rate capability, as well as high discharge capacity.