119th General Meeting of the KCS

Type Poster Presentation
Area 전기화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code ELEC.P-520
Subject Dual graphite cells for potassium-ion batteries
Authors 박춘국, 표명호*
순천대학교 인쇄전자공학과, Korea
Abstract Graphite is known to be reliable anode materials in Li-ion batteries (LIBs). Graphite also has been studied as a cathode material in LIBs. As the requirement of development of next-generation batteries, however, graphite is also seeking for its use in a new system. The work using graphite in potassium ion batteries (KIBs) was triggered by the finding that potassium ions could be intercalated into graphite, in contrast to sodium ions. Graphite can also be used as a cathode in KIBs. When used as a cathode, the cations in electrolytes are intercalated into the anode, and the graphite cathode stores the anions of electrolytes. The process is reversed during the discharge step. However, the graphite is oxidized at high voltages (>5.0 V vs. K/K+), which requires the careful selection of electrolytes. The electrolyte not only needs to be electrochemically stable at high potentials, but also to form stable SEI on an anode surface. In this study, we optimized electrolyte systems operable for K+-based graphite dual-ion cells. We also tried to maintain the electroactivity of graphite anode which was usually blocked due to SEI formation. The composition of SEI layer on the graphite anode surface was investigated using XPS analysis. Based on these results, we are trying to construct a symmetrical full cell using graphite as the active materials.
E-mail joreeck@naver.com