Liu Qiuhong, Jiang Wenwu, Lu Weizheng, Mei Yufan, He Fakang, Zhang Minhui, Liu Yin, Chen Yunqing, Peng Jinfeng, Ding Yanhuai
Institute of Rheological Mechanics, Xiangtan University, Xiangtan 411105, People's Republic of China.
Nanotechnology. 2020 Oct 23;31(43):435701. doi: 10.1088/1361-6528/aba303. Epub 2020 Jul 6.
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 with electrochemical stability up to 5.0 V. The LiFePO/Li cell with semi-aligned PAN@PVdF-HFP separator shows excellent cycling performance, good rate capability, as well as high discharge capacity.
与普通的电纺纳米纤维相比，纳米纤维的排列呈现出有趣的各向异性机械性能和结构稳定性。本文采用改进的电纺方法制备了半取向的PAN@PVdF-HFP纳米纤维隔膜。与电纺PAN薄膜相比，复合隔膜具有各向异性机械性能和增强的电化学性能。PAN@PVdF-HFP纳米纤维隔膜的离子电导率可达1.2 mSċcm，电化学稳定性高达5.0 V。采用半取向PAN@PVdF-HFP隔膜的LiFePO/Li电池表现出优异的循环性能、良好的倍率性能以及高放电容量。
