Programme

P.39 -- Poster, VCTP-48

Date: Thursday, 3 August 2023

Time: 08:30 - 10:00

Polyacrylonitrile-derived porous carbon nanofiber activated by terephthalic acid as free-standing anodes for lithium-ion batteries

Manh Dang Le (1), Loi Tuan Nguyen(2), Phuong Hoai Pham(1), Duy The Nguyen(1), Hieu Trung Bui(1)

(1)NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 700000, Vietnam; (2)Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam

This study focuses on the development of porous carbon nanofibers (PCNFs) by electrospinning through the sublimation of terephthalic (PTA) acid for free-standing anodes in lithium-ion batteries. Electrospun fiber mats prepared using polyacrylonitrile (PAN)/PTA in N, N-dimethylformamide solution were carbonized at 900oC for 2 h under vacuum to PCNFs. The free-standing, perforated features PCNFs can be directly applied as an anode in LIBs just after drying without requiring additional conducting additives or polymeric binders. The electrode was characterized using scanning electron microscopy (SEM), surface area analysis (BET), X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), and Raman spectra (Raman). The blending of PTA with PAN resulted in the formation of interconnected pores along the CNFs without changing the diameter. This strategy makes the PCNFs have a surface area of up to 290 m2 g-1 which is significantly higher than the carbon nanofibers (CNFs) with 107 m2 g-1. As a result, electrochemical tests exhibited that the PCNFs have a high discharge capacity of 750 mAh g-1, which is much higher than that of the CNFs (240 mAh g-1) at 100 mA g-1. Even when cycled at 3 A g-1, the PCNFs still exhibit a very high capacity of 621 mAh g-1. These results suggest that PCNFs anodes showed much improved electrochemical performance in comparison to the CNFs in terms of storage capacity, enhanced charge-discharge kinetics, and cycle stability.

Presenter: Le Dang Manh