본 연구에서는 고성능 리튬이온전지용 음극 소재로써 2차원 구조의 티타늄 카바이드(MXene)와 나노 실리콘의 정

전기적 결합을 통한 MXene/Si 음극 복합소재를 제조하였다. LiF/HCl을 이용하여 Ti3AlC2 MAX를 에칭해 Ti3C2Tx

MXene을 제조하였으며, 정전기적 결합을 형성하기 위해 나노 실리콘의 표면을 CTAB (Cetyltrimethylammonium

bromide)을 활용하여 양전하로 대전하였다. MXene/Si 음극 복합소재는 제조된 MXene과 대전 된 실리콘의 간단한 혼

합 공정을 통해 성공적으로 제조되었다. 제조된 복합소재의 물리적 특성과 전기화학적 특성을 MXene과 실리콘의 조

성비에 따라 조사하였으며, 전극의 안정성을 평가하기 위해 충·방전 사이클 후의 전극 표면을 분석하였다. MXene/Si

복합소재는 MXene 대비 실리콘 조성 비율이 2, 3 및 4로 증가할수록 1962.9, 2395.2 및 2504.3 mAh/g의 높은 초기

방전용량을 나타내었다. MXene과 실리콘 조성비가 1 : 4인 MXene/Si-4는 100 사이클에서 1387.5 mAh/g의 가역 용량과

74.5%의 용량 유지율을 나타내었으며, 4.0 C의 높은 율속에서도 700.5 mAh/g으로 높은 용량을 발현하였다. 이러한 결

과를 통해 정전기적 결합으로 제조된 MXene/Si 복합소재는 고성능 리튬이온배터리용 음극소재로 적용 될 수 있다.

In this study, the MXene/Si composite was prepared by electrostacic assembly with 2-dimensional structured

titanium carbide (MXene) and nano silicon for anode material of high-performance lithium-ion battery. Ti3C2Tx MXene

was synthesized by etching the Ti3AlC2 MAX with LiF/HCl, and the surface of nano silicon was charged to positively

using CTAB (Cetyltrimethylammonium bromide). The MXene/Si anode composite was successfully manufactured by simple

mixing process of synthesized MXene and charged silicon. The physical and electrochemical properties of prepared

composite were investigated with MXene-silicon composition ratio, and the surface of electrode after cycles was analyzed to

evaluate stability of the electrode. The MXene/Si composites demonstrated high initial discharge capacities of 1962.9,

2395.2 and 2504.3 mAh/g as the silicon composition ratio increased to 2, 3 and 4 compared to MXene, respectively.

MXene/Si-4, which is MXene and silicon ratio with 1 : 4, exhibited 1387.5 mAh/g of reversible capacity, 74.5% of capacity

retention at 100 cycles and high capacity of 700.5 mAh/g at high rate of 4.0 C. As the results, the MXene/Si composite

prepared by electrostatic-assenbly could be applied to anode materials for high-performance LIBs.

MXene, Nano silicon, Electrostatic self-assembly, Anode materials, LIBs

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