Improved high-temperature performance of lithium-ion batteries through use of a thermally stable co-polyimide-based cathode binder

• Published in: Journal of power sources 2014-04, Vol.252, p.138-143
• Main Authors: Choi, Jaecheol, Ryou, Myung-Hyun, Son, Bongki, Song, Jongchan, Park, Jung-Ki, Cho, Kuk Young, Lee, Yong Min
• Format: Article
• Language: English
• Subjects: Applied sciences; Binders; Binders (adhesives); Cathode binder; Cathodes; Co-polyimide; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrochemical impedance spectroscopy; Electrodes; Exact sciences and technology; High temperature; High-temperature stability; Lithium-ion batteries; Materials; Polyvinylidene fluorides; Scanning electron microscopy; Thermal stability
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2013.12.015

The effects of a thermally stable co-polyimide-based polymeric binder on the performance of a cathode electrode are investigated. The introduction of co-polyimide (P84) into a conventional polymeric binder system based on polyvinylidene fluoride (PVdF) enhances the cycle performance under high-temperature conditions (60 °C). Because of the inherent mechanical and thermal stabilities of the co-polyimide, P84 retains outstanding adhesive/cohesive strength within the electrode composite, as well as between the electrode composite and the aluminum current collector. These findings are further supported by electrochemical impedance spectroscopic analysis, scanning electron microscope, and studies using a Surface and Interfacial Cutting Analysis System (SAICAS®). •Co-polyimide binders improve high temperature cell performances of LIBs.•Adhesion strength within cathode electrodes is related to cell performance of LIBs.•Co-polyimide binders enhance adhesion strength within cathode electrodes.