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리튬 이온 배터리 음극의 고율속 성능 향상: MoSe2 나노 시트 코팅된 흑연 복합체의 최적 합성 조건에 대한 연구

Enhancing High-Rate Performance in Lithium-Ion Battery Anodes: A Study on Optimal Synthesis Conditions of MoSe2 Nanosheets-Decorated Graphite Composites

이영아|박승운|장규연|신혜영|윤하나
한국전기화학회 (The Korean Electrochemical Society)|2024.11|전기화학회지 (Journal of the Korean Electrochemical Society)|제27권 제4호|pp. 151-160|DOI https://doi.org/10.5229/JKES.2024.27.4.151

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키워드

Lithium-ion batteriesSurface modificationMoSe2Natural graphiteHydrothermal
주제분류화학

초록

리튬 이온 배터리의 수요 증가로 인해 고용량과 고율속 성능을 동시에 갖춘 전극 소재 개발이필수적이다. 현재 일반적으로 사용되는 흑연 음극 소재는 낮은 이론 용량과 고속 충/방전 시 성능 저하의 문제가 있다. 이러한 한계를 극복하기 위해 수열합성 방법을 통해 MoSe2 나노시트를흑연 표면에 코팅하는 최적 합성 조건을 찾고 흑연의 전기화학적 성능을 향상시키고자 하였다. 본 연구에서 개발한 MoSe2@Graphite 복합체 음극은 35 mA g–1의 낮은 전류 밀도 조건에서약 558 mAh g–1의 높은 용량 값을 보이며, pristine graphite (~376 mAh g–1) 대비 약 48% 향상된 우수한 용량을 보였다. 이에 더하여, MoSe2@Graphite 복합체 음극은 1600 mA g–1의높은 전류밀도 조건에서 100 회 사이클 테스트 후에도 약 439 mAh g–1의 높은 용량 값을 보였는데, 이는 pristine graphite (~221 mAh g–1)의 용량 값 대비 약 2 배 향상된 우수한 성능이다. 따라서, 우리가 개발한 MoSe2@Graphite 복합체는 고용량·고율속의 차세대 advanced LIB 용 유망한 음극 소재로 활용될 수 있을 것으로 기대된다.

Abstract

The rising demand for lithium-ion batteries has emphasized the critical need for electrode materials that combine both high capacity and superior high-rate performance. While graphite anodes, widely utilized today, offer structural stability and excellent electrical conductivity, they are hindered by low theoretical capacity and performance degradation during rapid charge/discharge cycles. To overcome these limitations, this study focuses on enhancing the electrochemical properties of graphite by optimizing the synthesis conditions for decorating MoSe2 nanosheets onto the natural graphite (NG) surface via hydrothermal synthesis. The MoSe2@NG composite anode developed in this study demonstrated a high capacity of approximately 558 mAh g–1 at a low current density of 35 mA g–1, showing a remarkable 48% increase over pristine NG (~376 mAh g–1). Additionally, even after 100 cycles at a high current density of 1600mA g–1, the MoSe2@NG composite anode maintained a capacity of around 439mAh g–1, nearly double that of pristine NG (~221 mAh g–1 after 100 cycles). These findings highlight the potential of the MoSe2@NG composite as a promising next-generation anode material for advanced lithium-ion batteries, delivering both high capacity and excellent high-rate performance.

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