수열합성법을 이용한 코발트 황화물-산화그래핀 나노복합체 제조 및 전기화학적 특성 연구
Synthesis and electrochemical properties of cobalt sulfide-graphene oxide nanocomposites by hydrothermal method
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초록
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 복합화된 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.
Abstract
Cobalt sulfide nanocomposites were synthesized through a simple hydrothermal method as anode materials forsodium ion batteries (SIBs). In this work, a cobalt sulfide nanoparticle (CoS-NF) and a cobalt sulfide nanocompositeintegrated with reduced graphene oxide (CoS@G-NC) were fabricated for electrochemical energy storage performance ofbattery. The as-prepared CoS@G-NC electrode exhibited reversible and stable cycle performance (62 % after 30 cycles atcurrent density of 200 mA g-1). The improved electrochemical property was attributed to the small grain growth and uniformdistribution of cobalt sulfide during synthesis, which maximized the diffusion pathway for sodium ions and effectivelysuppressed the delamination and volume expansion of cobalt sulfide during the conversion reaction. The results providepromising anode materials for next-generation SIBs.
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