수열합성법을 이용한 코발트 황화물-산화그래핀 나노복합체 제조 및 전기화학적 특성 연구 = Synthesis and electrochemical properties of cobalt sulfide-graphene oxide nanocomposites by hydrothermal method

다국어 초록 (Multilingual 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.