리튬이온전지 음극 소재 응용을 위한 ZnO 나노입자 위 CNT의 직접 성장과 전기화학 특성 평가

Abstract

Zinc oxide (ZnO) is a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity (~987 mAh/g) but suffers from poor electrical conductivity and structural degradation. To address these issues, carbon nanotubes (CNTs) were directly grown on the surface of ZnO particles using a rotary chemical vapor deposition (RCVD) system. By varying the growth temperature and time, the quantity and crystallinity of the CNTs were effectively controlled. SEM and TGA analyses revealed a decrease in CNT quantity with increasing CVD temperature, while Raman spectroscopy indicated enhanced crystallinity of the CNTs. Electrochemical impedance spectroscopy and differential capacity (dQ/dV) analyses confirmed that the CNTs enhance interfacial charge transfer and structural reversibility. Our results demonstrate that direct growth of CNTs on ZnO via RCVD system offers a rational and scalable strategy to improve the electrochemical performance of ZnO-based anodes.