[논문]리튬이차전지 양극 분말 소재 위 탄소나노튜브의 직접 성장 거동 고찰

한현호; 이종환; 정구환

doi:10.5695/jsse.2024.57.1.22

리튬이차전지 양극 분말 소재 위 탄소나노튜브의 직접 성장 거동 고찰
Investigation of direct growth behavior of carbon nanotubes on cathode powder materials in lithium-ion batteries 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.57 no.1, 2024년, pp.22 - 30

한현호 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정) , 이종환 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정) , 정구환 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정)

Abstract ▼ AI-Helper

This study reports a direct growth of carbon nanotubes (CNTs) on the surface of LiCoO2 (LCO) powders to apply as highly efficient cathode materials in lithium-ion batteries (LIB). The CNT synthesis was performed using a thermal chemical vapor deposition apparatus with temperatures from 575 to 625 ℃. Ferritin molecules as growth catalyst of CNTs were mixed in deionized (DI) water with various concentrations from 0.05 to 1.0 mg/mL. Then, the LCO powders was dissolved in the ferritin solution at a ratio of 1g/mL. To obtain catalytic iron nanoparticles on the LCO surface, the LCO-ferritin suspension was dropped in silicon dioxide substrates and calcined under air at 550℃. Subsequently, the direct growth of CNTs on LCO powders was performed using a mixture of acetylene (10 sccm) and hydrogen (100 sccm) for 10 min. The growth behavior was characterized by scanning and transmission electron microscopy, Raman scattering spectroscopy, X-ray diffraction, and thermogravimetric analysis. The optimized condition yielding high structural quality and amount of CNTs was 600 ℃ and 0.5 mg/mL. The obtained materials will be developed as cathode materials in LIB.

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표/그림 (7)

그림 Fig. 1. (a) Schematic presentation of TCVD system. SEM images of LCO powder (b) before and (c) after CNT growth at 600 ℃. (d) and (e) are high magnification SEM images of (c).
그림 Fig. 2. (a) Raman and (b) XRD profiles from LCO powder. (c) Raman and (d) XRD results from LCO with CNTs grown at 600 ℃.
그림 Fig. 3. SEM images showing LCO with CNTs grown at (a),(b): 575, (c),(d): 600, and (e),(f): 625 ℃.
그림 Fig. 5. SEM images showing LCO with CNTs grown with various ferritin concentrations. (a),(b): 1, (c),(d): 0.5, (e),(f): 0.1, and (g),(h): 0.05 mg/mL. (i) XRD profiles from LCO with CNTs grown using various ferritin concentrations.
그림 Fig. 4. (a) Raman and (b) TGA results from LCO with CNTs grown at various temperatures.
그림 Fig. 6. (a) Raman and (b) TGA results from LCO with CNTs grown using various ferritin concentrations.
그림 Fig. 7. (a) Low and (b) high magnification TEM images of CNTs grown at 600 ℃ and 0.5 mg/mL ferritin concentration.

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