CNT와 CNF 복합첨가에 따른 Si/SiO2/C 음극활물질의 전기화학적 특성

서진성; 윤상효; 나병기; Jin-Seong Seo; Sang-Hyo Yoon; Byung-Ki Na

Korean Chemical Engineering Research, Vol.59, No.1, 35-41, February, 2021

DOI10.9713/kcer.2021.59.1.35 Export Citation

CNT와 CNF 복합첨가에 따른 Si/SiO2/C 음극활물질의 전기화학적 특성

Electrochemical Characteristics of Si/SiO2/C Anode Material for Lithium-Ion Battery According to Addition of CNT and CNF Compounds

서진성, 윤상효, 나병기 ^†

충북대학교 화학공학과, 28644 충북 청주시 서원구 충대로 1

Jin-Seong Seo, Sang-Hyo Yoon, and Byung-Ki Na^†

Department of Chemical Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Ku, Cheongju, Chungbuk, 28644, Korea

E-mail:

초록

차세대 리튬이차전지용 음극활물질로 각광을 받고 있는 실리콘은 높은 이론용량을 가지고 있어 상용화를 하기 위해 많은 연구가 진행되었다. 하지만 실리콘은 충방전시 부피팽창이 심하고, 전기전도도가 낮은 단점을 가지고 있다. 이러한 문제를 해결하기 위해서 실리콘 표면에 SiO2를 형성시키고, 탄소를 코팅함으로써 실리콘의 부반응을 억제시키고 전기전도도를 향상시켰다. 추가적으로 CNF와 CNT를 복합적으로 첨가하여 부피팽창에 대한 완충효과를 부여하고 전기 전도도를 향상시켰다. 제조된 샘플은 XRD, SEM, EDS로 물리적 특성 분석을 실시하였으며, 전기화학적 특성은 전기 전도도, EIS, CV 그리고 사이클 테스트를 통해 분석하였다. (Si/SiO2/C)+CNT&CNF 복합체의 경우 다른 샘플들에 비하여 높은 전기전도도 및 낮은 전하전달저항을 보여주었으며, 사이클테스트 결과 첫 번째 사이클에서 1528 mAh/g 그리고 50번째 사이클에서 1055 mAh/g의 용량을 가졌으며 83%의 용량 유지율을 보여주었다.

Silicon is a promising next-generation anode material for lithium-ion battery, and it has been studied for commercialization due to the high theoretical capacity. However, it has problems of the volume change during chargedischarge and the poor electrical conductivity. To solve these problems, formation of SiO2 and carbon coating on the surface of silicon crystal were performed to protect the side reaction and enhance the electrical conductivity of silicon. CNT and CNF were also added to mitigate the volume change and increase the conductivity. Physical properties of asprepared samples were analyzed by XRD, SEM, and EDS. Electrochemical characteristics were investigated by electrical conductivity measurement, EIS, CV and cycle performance test. (Si/SiO2/C)+CNT&CNF showed high electrical conductivity and low charge-transfer resistance, and the capacity was 1528 mAh/g at 1st cycle and 1055 mAh/g at 50th cycle with 83% capacity retention.

Keywords:Lithium ion battery;Anode material;Si;SiO2;Carbon coating;CNF;CNT

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