Carbon Nanowalls as Anode Materials with Improved Performance Using Carbon Nanofibers

被引：6

作者：

Kim, Kangmin ^{[1
]}

Bon, Chris Yeajoon ^{[2
]}

Kim, Junghyun ^{[3
]}

Ko, Jang Myoun ^{[4
]}

Choi, Wonseok ^{[1
]}

机构：

[1] Hanbat Natl Univ, Dept Elect Engn, Daejeon 32158, South Korea

[2] Seoul Natl Univ, Res Inst Adv Mat RIAM, Dept Mat Sci & Engn, Seoul 08826, South Korea

[3] Hanbat Natl Univ, Dept Adv Mat Engn, Daejeon 34158, South Korea

[4] Hanbat Natl Univ, Dept Chem & Biol Engn, Daejeon 305719, South Korea

来源：

NANOMATERIALS | 2023年 / 13卷 / 19期

基金：

新加坡国家研究基金会;

关键词：

carbon nanowalls; carbon nanofiber; PAN; electrospinning method; lithium-ion batteries; NANOTUBES;

D O I：

10.3390/nano13192622

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this paper, a new synthesis of carbon nanofibers (CNFs)/carbon nanowalls (CNWs) was performed to improve the characteristics of anode materials of lithium-ion batteries by using the advantages offered by CNWs and CNFs. Among the carbon-based nanomaterials, CNWs provide low resistance and high specific surface area. CNFs have the advantage of being stretchable and durable. The CNWs were grown using a microwave plasma-enhanced chemical vapor deposition (PECVD) system with a mixture of methane (CH4) and hydrogen (H2) gases. Polyacrylonitrile (PAN) and N,N-Dimethyl Formamide (DMF) were stirred to prepare a solution and then nanofibers were fabricated using an electrospinning method. Heat treatment in air was then performed using a hot plate for stabilization. In addition, heat treatment was performed at 800 degrees C for 2 h using rapid thermal annealing (RTA) to produce CNFs. A field emission scanning electron microscope (FE-SEM) was used to confirm surface and cross-sectional images of the CNFs/CNWs anode materials. Raman spectroscopy was used to examine structural characteristics and defects. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and constant current charge/discharge tests were performed to analyze the electrical characteristics. The synthesized CNFs/CNWs anode material had a CV value in which oxidation and reduction reactions were easily performed, and a low Rct value of 93 ohm was confirmed.

引用

页数：10