바이오매스 유래 하드 카본 음극의 효율적인 소듐 저장을 위한 실험적 최적화 연구

• Published in: 대한금속·재료학회지, 63(1) Vol. 63; no. 1; pp. 53 - 59
• Main Authors: 이소현, So Hyun Lee, 이상준, Sang Jun Lee, 정수환, Su Hwan Jeong, 이현경, Hyun Kung Lee, 김현석, Hyunseok Kim, 최진우, Jinwoo Choi, 김주형, Joo-hyung Kim
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 01.01.2025; 대한금속·재료학회
• Subjects: Artificial graphite; Biomass; Hard carbon; Sodium ion batteries; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2025.63.1.53

Hard carbon is widely recognized as the most promising anode material for sodium-ion batteries (SIBs). Hard carbon is a non-graphitizable carbon characterized by a turbostratic structure with disordered stacking of carbon layers, each consisting of a few nanometer-sized graphene layers. It remains difficult to graphitize even at temperatures above 2500°C. This unique structure, combined with its low cost, high electrical conductivity, low working voltage, and high capacity, allows hard carbon to achieve exceptional sodium ion storage performance. These characteristics make it the most commercially viable anode material. Recent research has also actively explored the use of biomass instead of high-cost inorganic materials, to reduce production costs, minimize pollution from biomass incineration, and reduce the significant amounts of biological waste produced annually. This study investigates the performance of hard carbon anodes derived from lignin, with commercial graphite serving as a control. X-ray diffraction (XRD), Raman spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and X-ray Photoelectron Spectroscopy (XPS) were utilized to analyze their crystallographic structures, microstructures, and surface elemental compositions. Electrochemical performance was evaluated using electrolytes consisting of 1M NaPF 6 in EC/DEC (1:1 v/v) with 5 wt% FEC and 1M NaPF 6 in DEGDME. By comparing the electrochemical characteristics of hard carbon and graphite under different electrolyte conditions, this study demonstrates the potential of hard carbon as a promising anode material for sodium-ion battery applications. (Received 10 October, 2024; Accepted 23 November, 2024)