[22a-A401-1~6] 6.3 Oxide electronics

[22a-A401-4] Investigation of Li-ion batteries using Cu as a cathode current collector

〇Iwao Kawayama¹, Yuki Ishida¹, Kentaro Koide¹, Mizuki Shima¹, Riki Kataoka², Mitsunori Kitta², Yasushi Maeda², Toshiya Doi¹ (1.Kyoto Univ., 2.AIST)

Keywords:all solid-state Li-ion battery, cathode current collector

Cu has a redox potential of about 3.5 V, which is lower than the cathode potential of Li-ion batteries, and it has been considered difficult to use Cu as a cathode current collector because of the oxidation reaction that occurs during charging. We investigated if Cu could operate as a cathode current collector by inserting a chemically stable intermediate layer between the cathode active material and Cu to prevent contact between the cathode active material and the electrolyte. In this study, we fabricated a Li-ion battery using Nb-doped SrTiO₃ thin film as an intermediate layer and Cu as a cathode current collector and verified its characteristics.