Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Synthesis and electrochemical properties of cobalt sulfide-graphene oxide nanocomposites by hydrothermal method

수열합성법을 이용한 코발트 황화물-산화그래핀 나노복합체 제조 및 전기화학적 특성 연구

  • Su Hwan Jeong (Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Joo-Hyung Kim (Department of Materials Engineering and Convergence Technology, Gyeongsang National University)
  • 정수환 (경상국립대학교 나노신소재융합공학과) ;
  • 김주형 (경상국립대학교 나노신소재융합공학과)
  • Received : 2023.11.02
  • Accepted : 2023.11.14
  • Published : 2023.12.31
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Abstract

Cobalt sulfide nanocomposites were synthesized through a simple hydrothermal method as anode materials for sodium ion batteries (SIBs). In this work, a cobalt sulfide nanoparticle (CoS-NF) and a cobalt sulfide nanocomposite integrated with reduced graphene oxide (CoS@G-NC) were fabricated for electrochemical energy storage performance of battery. The as-prepared CoS@G-NC electrode exhibited reversible and stable cycle performance (62 % after 30 cycles at current density of 200 mA g-1). The improved electrochemical property was attributed to the small grain growth and uniform distribution of cobalt sulfide during synthesis, which maximized the diffusion pathway for sodium ions and effectively suppressed the delamination and volume expansion of cobalt sulfide during the conversion reaction. The results provide promising anode materials for next-generation SIBs.

차세대 나트륨이온전지용 음극 소재로 유망한 코발트 황화물 나노복합체를 간단한 수열법을 통해 합성하였다. 본 연구에서는 배터리의 전기화학적 에너지 저장 성능 향상을 위해 코발트 황화물 나노입자와 환원된 산화그래핀과 복합화 된 코발트 황화물 나노복합체를 제조하여 비교해주었다. 제조된 나노복합체 전극은 가역적이고 안정적인 사이클 성능(전류밀도 200 mA g-1에서 30 사이클 후 62 %)을 보였다. 개선된 전기화학적 특성은 수열합성 과정에서 코발트 황화물의 입자 크기가 작고 균일하게 분포되어 나트륨 이온의 확산 경로를 극대화함에서 기인하였다. 뿐만 아니라 전환 반응 중 음극재의 박리 및 부피 팽창을 효과적으로 억제함으로써 차세대 나트륨이온전지용 유망한 음극 소재로써의 가능성을 보여주었다.

Keywords

Acknowledgement

This result was supported by the "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (2021RIS-003). This result was supported by the "Specialized Growth Support Project in Innotown (Gyeongnam-Jinju)" funded by the Ministry of Science and ICT (2023-IT-RD-0037).

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