[논문]다공성 구조를 갖는 (Ni,Co)Se2-CNT microsphere의 합성과 소듐 이차전지 음극활물질로서의 전기화학적 특성 연구

김영범; 박기대

doi:10.7464/ksct.2023.29.3.178

다공성 구조를 갖는 (Ni,Co)Se2-CNT microsphere의 합성과 소듐 이차전지 음극활물질로서의 전기화학적 특성 연구
Synthesis of porous-structured (Ni,Co)Se2-CNT microsphere and its electrochemical properties as anode for sodium-ion batteries 원문보기

청정기술 = Clean technology, v.29 no.3, 2023년, pp.178 - 184

김영범 (충북대학교 신소재공학과) , 박기대 (충북대학교 신소재공학과)

초록
AI-Helper

전이금속 칼코젠화물은 소듐 이차전지의 음극재로서 높은 이론 용량을 가지나 충·방전 과정에서 큰 부피 팽창으로 인해 짧은 수명 특성을 보이며, 낮은 전기전도도로 인해 출력 특성을 저하시킨다는 문제가 있다. 이를 해결하기 위해, 본 연구에서는 분무열분해와 후 열처리 공정을 통해 다공성의 CNT ball과 (Ni,Co)Se₂ 나노결정이 복합된 구조체를 합성하였으며, 이를 소듐 이차전지의 음극에 적용시켜 전기화학적 특성을 평가하였다. 합성된 소재는 분무열분해 동안 Polystyrene(PS) 나노비드의 분해로 인해 다공성 구조를 형성하여 충방전 과정에서 발생하는 부피팽창을 효과적으로 수용하였으며, CNT 소재와의 복합화를 통해 전기화학적 성능을 향상시킬 수 있었다. 이로 인해 다공성 구조의 (Ni,Co)Se₂-CNT 복합소재는 0.2 A g^-1의 전류밀도에서 698 mA h g^-1의 높은 초기 방전용량을 보였으며, 100 사이클 후 400 mA h g^-1의 방전용량을 유지함을 보였다.

Abstract ▼ AI-Helper

Transition metal chalcogenides have garnered significant attention as anode materials for sodium-ion batteries due to their high theoretical capacity. Nevertheless, their practical application is impeded by their limited lifespan resulting from substantial volume expansion during cycling and their low electrical conductivity. To tackle these issues, this study devised a solution by synthesizing a nanostructured anode material composed of porous CNT (carbon nanotube) spheres and (Ni,Co)Se2 nanocrystals. By employing spray pyrolysis and subsequent heat treatments, a porous-structured (Ni,Co)Se2-CNT composite microsphere was successfully synthesized, and its electrochemical properties as an anode for sodium-ion batteries were evaluated. The synthesized (Ni,Co)Se2-CNT microsphere possesses a porous structure due to the nanovoids that formed as a result of the decomposition of the polystyrene (PS) nanobeads during spray pyrolysis. This porous structure can effectively accommodate the volume expansion that occurs during repeated cycling, while the CNT scaffold enhances electronic conductivity. Consequently, the (Ni,Co)Se2-CNT anode exhibited an initial discharge capacity of 698 mA h g-1 and maintained a high discharge capacity of 400 mA h g-1 after 100 cycles at a current density of 0.2 A g-1.

주제어

표/그림 (6)

그림 Scheme 1. Schematic illustration of formation mechanism for porous (Ni,Co)Se₂-CNT composite microsphere.
그림 Figure 1. Morphological characteristics of p-(Ni,Co)O-CNT microspheres: (a)-(b) SEM images, (c) TEM image, and (d) SAED pattern.
그림 Figure 2. Morphological characteristics of p-(Ni,Co)-CNT microspheres: (a)-(b) SEM images, (c) TEM image, and (d) SAED pattern.
$Figure 3. Morphological characteristics of p-(Ni,Co)Se2-CNT microspheres: (a)-(b) SEM images, (c) TEM image, and (d) mapping images. (e) X-ray diffraction pattern of p-(Ni,Co)Se2-CNT.$ 그림 Figure 3. Morphological characteristics of p-(Ni,Co)Se₂-CNT microspheres: (a)-(b) SEM images, (c) TEM image, and (d) mapping images. (e) X-ray diffraction pattern of p-(Ni,Co)Se₂-CNT.
그림 Figure 5. Electrochemical performance of the p-(Ni,Co)Se2-CNT and d-(Ni,Co)Se₂ anodes for SIBs: (a) discharge-charge curves and (b) cycle performances at a current density of 0.2 A g^-1.
$Figure 4. (a)-(b) SEM images, (c) X-ray diffraction pattern of d-(Ni,Co)Se2 mircospheres.$ 그림 Figure 4. (a)-(b) SEM images, (c) X-ray diffraction pattern of d-(Ni,Co)Se₂ mircospheres.

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