S-Space Graduate School of Convergence Science and Technology (융합과학기술대학원) Dept. of Transdisciplinary Studies(융합과학부) Theses (Master's Degree_융합과학부)
Solvothermal Synthesis of Molybdenum Disulfide/Reduced Porous Graphene Oxide Nanocomposite as High Performance Anode Material for Lithium Ion Battery
용매열 합성을 통한 이황화 몰리브덴/ 환원 다공성 그래핀 옥사이드 나노 복합체의 합성 및 리튬 이온 배터리용 음극재 활용
- 융합과학기술대학원 융합과학부
- Issue Date
- 서울대학교 대학원
- 학위논문 (석사)-- 서울대학교 대학원 : 융합과학부, 2017. 2. 박원철.
- Lithium ion batteries are widely used as power sources for portable electronic devices and hybrid electric vehicles. Electrode materials with high lithium storage capacity have been studied to meet the requirements of these applications. Among these materials, molybdenum disulfide (MoS2) is one of promising anode material to replace commercial graphite anode because intercalation of a MoS2 with 4 Li+ ions results in a higher storage capacity for MoS2 (670 mA h g-1) than commercial graphite anodes (372 mA h g-1). Although MoS2 has a high theoretical capacity than graphite as an anode material for Lithium-ion battery, its intrinsic poor electrical/ionic conductivity decreases rate property and lithium storage capacity. In my thesis, I prepared MoS2/reduced porous graphene oxide (rPGO) composite by solvothermal method to complement conductivity and improve lithium storage properties of MoS2. PGO was synthesized by convenient, low-cost, and mass-producible nitric acid treatment method. Due to its enlarged surface area and porous structure, MoS2/rPGO sample exhibited improved capacity and cyclic stability than other MoS2/reduced graphene oxide (rGO) and MoS2 nanoparticle samples. After 100 cycles, MoS2/rPGO electrode shows improved capacity of 932 mA h g-1 while capacity of MoS2/rGO electrode is 395 mA h g-1 at 200 mA g-1.