Facile Fabrication of Flexible Carbon Nanofiber Electrodes with Both High Packing Density and Capacity for Li‐Ion Batteries

Advanced Energy & Sustainability Research

Ahmed A. Aboalhassan¹  Yuanyuan Zhang²  Jianhua Yan²  Bin Ding³  Jianyong Yu³  Hui Zhang⁴ 

[1] College of Materials Science and Engineering Donghua University Shanghai 201620 China;College of Textiles Donghua University Shanghai 201620 China;Innovation Center for Textile Science and Technology Donghua University Shanghai China;Qian Xuesen Laboratory China Academy of Space Technology Beijing China;

关键词: compact carbon nanofiber films;    electrospinning;    flexible electrodes;    high energy density;    high packing density;   

DOI  :  10.1002/aesr.202100020

来源: DOAJ

【 摘 要 】

Freestanding carbon nanofiber (CNF) films are promising flexible battery electrodes because of their rich functionalities and the avoidance of the unnecessary usage of conductive additives and binders, which introduce additional interfacial resistance. However, most reported freestanding CNF electrodes have lower energy density than the metrics of practical usage. Herein, an in situ welding strategy is proposed to fabricate flexible CNF electrodes with both high packing density (0.343 g cm−3) and capacity (832.4 mA h g−1 @0.1 C) by electrospinning of a polyacrylonitrile (PAN) and poly(vinyl‐butyral) (PVB) sol followed by pyrolysis. The addition of 20 wt% of low‐thermal‐stability PVB into PAN carbon precursors endows the CNFs with mixed amorphous/graphitic carbon domains and welded structures. The former enhances the capacity and long‐cycling stability, and the latter improves the flexibility and packing density of the anodes. As a result, these flexible anodes display stable reversible capacities of 430 mA h g−1 @1 C over 1000 cycles and excellent rate performance from 0.1 to 5 C. The successful fabrication of high‐capacity CNF anodes at commercial‐level density opens a new avenue for their practical application.

【 授权许可】

Unknown