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Korean Chemical Engineering Research,
Vol.61, No.1, 32-38, 2023
Vol.61, No.1, 32-38, 2023
리튬이온배터리용 도파민이 코팅된 실리콘/실리콘 카바이드 음극복합소재의 전기화학적 특성
Electrochemical Characteristics of Dopamine coated Silicon/Silicon Carbide Anode Composite for Li-Ion Battery
본 연구에서는 리튬 이온 배터리 용 음극활물질인 실리콘의 사이클 안정성 및 율속 특성을 개선하기 위해 도파민이 코팅된 실리콘/실리콘카바이드/카본(Si/SiC/C) 복합소재의 전기화학적 특성을 조사하였다. Stöber 법에 CTAB을 추가 하여 CTAB/SiO2를 합성한 후 열 흡수제로써 NaCl을 첨가한 마그네슘 열 환원법을 통해 Si/SiC 복합소재를 제조하였 으며, 도파민의 중합반응을 통해 탄소코팅을 하여 Si/SiC/C 음극소재를 합성하였다. 제조된 Si/SiC/C 음극소재의 물리적 특성 분석을 위해 SEM, TEM, XRD와 BET를 사용하였으며, 1M LiPF6 (EC : DEC = 1 : 1 vol%) 전해액에서 리튬 이온 배터리의 사이클 안정성, 율속 특성, 순환전압전류 및 임피던스 테스트를 통해 전기화학적 특성을 조사하였다. 제조된 1-Si/SiC는 100사이클, 0.1 C에서 633 mAh/g의 방전용량을 나타냈으며, 도파민이 코팅된 1-Si/SiC/C는 877 mAh/g으로 사이클 안정성이 향상된 것을 확인할 수 있었다. 또한 5 C에서 576 mAh/g의 높은 용량과 0.1 C/0.1 C 일 때 99.9%의 용량 회복 성능을 나타내었다.
In this study, the electrochemical properties of dopamine coated silicon/silicon carbide/carbon(Si/SiC/C) composite materials were investigated to improve cycle stability and rate performance of silicon-based anode active material for lithium-ion batteries. After synthesizing CTAB/SiO2 using the Stöber method, the Si/SiC composites were prepared through the magnesium thermal reduction method with NaCl as heat absorbent. Then, carbon coated Si/SiC anode materials were synthesized through polymerization of dopamine. The physical properties of the prepared Si/SiC/C anode materials were analyzed by SEM, TEM, XRD and BET. Also the electrochemical performance were investigated by cycle stability, rate performance, cyclic voltammetry and EIS test of lithium-ion batteries in 1 M LiPF6 (EC: DEC = 1:1 vol%) electrolyte. The prepared 1-Si/SiC showed a discharge capacity of 633 mAh/g and 1-Si/SiC/C had a discharge capacity of 877 mAh/g at 0.1 C after 100 cycles. Therefore, it was confirmed that cycle stability was improved through dopamine coating. In addition, the anode materials were obtain a high capacity of 576 mAh/g at 5 C and a capacity recovery of 99.9% at 0.1 C/0.1 C.
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