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Received September 28, 2018
Accepted October 22, 2018
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이차전지 음극활물질 Si/PC/CNF/PC 복합 소재의 전기화학적 특성
Electrochemical Characteristics of Si/PC/CNF/PC Composite for Anode Material of Lithium ion Battery
(주)EG, 32710 충청남도 금산군 추부면 서대산로 459 1충북대학교 화학공학과, 28644 충청북도 청주시 서원구 충대로 1 2충남대학교 응용화학공학과, 34134 대전광역시 유성구 대학로 99
EG CORPORATION, 459, Seodaesan-ro, Chubu-myeon, Geumsan-gun, Chungcheongnam-do, 32710, Korea 1Department of Chemical Engineering, Chungbuk National University, 1, Chungdae-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 28644, Korea 2Department of Chemical Engineering and Applied Chemistry, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34134, Korea
nabk@chungbuk.ac.kr
Korean Chemical Engineering Research, December 2018, 56(6), 798-803(6), 10.9713/kcer.2018.56.6.798 Epub 4 December 2018
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Abstract
Si을 리튬이온전지 음극활물질로 사용하기 위해 입도를 0.5 μm 보다 작은 크기로 제어하였고 표면에 탄소를 약 10 nm 두께로 코팅하였다. 그 위에 탄소섬유를 50~150 wt% 양으로 성장시키고 다시 한 번 탄소코팅을 진행하였다. 이렇게 만들어진 Si 합성물질은 전기전도성을 높이기 위한 공정으로 이종 금속을 혼합하였으며 수명 특성을 개선하기 위해 흑연과 복합화하였다. 실험 변수에 따른 재료들의 물리화학적 특성을 XRD, SEM 및 TEM을 사용하여 측정하였고 코인셀을 제조하여 전기화학적 특성을 평가하였다. Si/PC (Pyrolytic Carbon)/CNF (Carbon Nano Fiber)보다 Si/PC/CNF/PC가 전체적으로 Si 함량이 줄어 방전용량은 상대적으로 낮게 나타났지만 전지평가에서 중요한 수명특성에서는 좋은 결과를 보여주었다. 0.2 C rate에서 1512 mA h g-1의 초기 방전 용량과 78%의 초기 효율을 나타내었고 10 싸이클 에서 94%의 용량 보존율을 보여주었다.
In order to use Si as an anode material for lithium-ion battery, the particle size was controlled to less than 0.5 μm and carbon was coated on the surface with the thickness less than 10 nm. The carbon fiber was grown on the Si surface with 50~150 wt%, and the carbon coating was carried out once again. The Si composite material was mixed with dissimilar metals to increase the conductivity, and graphite was mixed to improve cyclic life characteristics. The physical and electrochemical characteristics of composite materials were measured with XRD, SEM, TEM and coin cell. The discharge capacity of Si/PC/CNF/PC was lower than that of Si/PC (Pyrolytic Carbon)/CNF (Carbon Nano Fiber). However, the cyclic life of Si/PC/CNF/PC was higher. Initial discharge capacity of 1512 mA h g-1 at 0.2 C rate and initial efficiency of 78% were shown. It also showed a capacity retention of 94% in 10 cycles.
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