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Received March 22, 2018
Accepted May 8, 2018
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석유계 피치를 사용한 실리콘/탄소 음극소재의 전기화학적 특성
Electrochemical Characteristics of Silicon/Carbon Anode Materials using Petroleum Pitch
충북대학교 화학공학과, 28644 충청북도 청주시 서원구 충대로 1
Department of Chemical Engineering, Chungbuk National University, 1, Chungdae-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do, 28644, Korea
jdlee@chungbuk.ac.kr
Korean Chemical Engineering Research, August 2018, 56(4), 561-567(7), 10.9713/kcer.2018.56.4.561 Epub 3 August 2018
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Abstract
본 연구에서는 리튬이온전지 실리콘 음극소재의 사이클 안정성 향상을 위해 실리콘/탄소 음극소재의 전기화학적 특성을 조사하였다. Tetraethyl orthosilicate (TEOS) 로부터 스토버법 및 마그네슘 열 환원법을 통하여 다공성 실리콘을 제조하고, 제조된 다공성 실리콘과 피치의 질량비에 따라 실리콘/탄소 음극소재를 제조하였다. 실리콘/탄소 음극소재의 물리적 특성은 XRD와 TGA를 통해 분석하였다. 1.0M LiPF6 (EC : DEC = 1 : 1 vol%) 전해액에서 실리콘/탄소 음극소재의 충·방전 사이클, 율속, 순환전압전류, 임피던스 테스트를 통해 전기화학적 특성을 조사하였다. 제조된 실리콘/탄소 음극소재 실리콘 : 탄소 = 5 : 95 일때 453 mAh/g의 향상된 용량을 나타내었으며, 사이클 성능 또한 두 번째 사이클 이후 30 사이클까지 매우 우수한 사이클 안정성을 나타냄을 확인하였다.
In this study, the electrochemical characteristics of Silicon/Carbon anode materials were analyzed to improve the cycle stability of silicon as an anode materials of lithium ion battery. Porous silicon was prepared from TEOS by the st.ber method and the magnesiothermic reduction method. Silicon/Carbon anode materials were synthesized by varying the mass ratio between porous silicon and pitch. Physical properties of the prepared Silicon/Carbon anode materials were analyzed by XRD and TGA. Also the electrochemical performances of Silicon/Carbon anode materials were investigated by constant current charge/discharge, rate performance, cyclic voltammetry and electrochemical impedance tests in the electrolyte of LiPF6 dissolved in organic solvents (EC : DEC = 1 : 1 vol%). The Silicon/ Carbon anode composite (silicon : carbon = 5 : 95 in weight) has better capacity (453 mAh/g) than those of other composition cells. The cycle performance has an excellent capacity retention from 2nd cycle to 30th cycle.
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