Improved Cyclic Performance of Lithium-Ion Batteries: An Investigation of Cathode/Electrolyte Interface via In Situ Total-Reflection Fluorescence X-ray Absorption Spectroscopy

• DOI: 10.1021/jp5011132
• Publication Date: 2014-04-25T19:23:16Z
• Authors: Kentaro Yamamoto; Taketoshi Minato; Shinichiro Mori; Daiko Takamatsu; Yuki Orikasa; Hajime Tanida; Koji Nakanishi; Haruno Murayama; Titus Masese; Takuya Mori; Hajime Arai; Yukinori Koyama; Zempachi Ogumi; Yoshiharu Uchimoto
• Keywords: 02 engineering and technology; 0210 nano-technology; 16. Peace & justice; 01 natural sciences; 7. Clean energy; 0104 chemical sciences

For the further development of lithium-ion batteries, improvement their cyclic performance is crucial. However, mechanism underlying deterioration battery not fully understood. We investigated effects electronic structure at electrode/electrolyte interface on cathode materials via in situ total-reflection fluorescence X-ray absorption spectroscopy. In a LiCoO2 thin-film electrode that exhibits gradual upon subsequent Li ion extractions and insertions (cycling), reduction Co ions was observed immersion an organic electrolyte, with irreversible changes after cycling. contrast, LiFePO4 electrode, stable reversible electrolyte The increased stability LiFePO4/electrolyte affects its cycling performance.