S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Theses (Master's Degree_재료공학부)
New metal redox battery system using hybrid electrolyte
삼중 전해질을 이용한 새로운 금속 레독스 전지 시스템에 관한 연구
- 공과대학 재료공학부
- Issue Date
- 서울대학교 대학원
- 학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2014. 2. 강기석.
- Li-aqueous batteries are innovative system that solve problem of traditional aqueous batteries. Aqueous batteries have many merits like safety, economic feasibility, and various cell reaction. However, cell voltage of aqueous batteries are low because electrochemical stability window of H2O is narrow (0~1.23 V vs. SHE). For this reason, aqueous batteries are rarely used and non-aqueous Li-ion batteries are commercialized today. Li-aqueous batteries are new concept that can increase the voltage of aqueous battery. We constructed this Li-aqueous battery system and tested the cell using attractive redox system. Ni2+/Ni(s) redox reaction contain two electron for one transition metal, resulting in large specific capacity. Fe3+/Fe2+ redox reaction has high voltage (3.81 vs. Li+/Li) and iron sources are inexpensive. We also analyzed the cell reaction by XRD, SEM, and GITT analysis. By this new metal redox battery system using hybrid electrolyte, we obtained large capacity of Ni2+/Ni(s) reaction and high voltage of Fe3+/Fe2+ reaction.