Stable performance of an all-solid-state Li metal cell coupled with a high-voltage NCA cathode and ultra-high lithium content poly(ionic liquid)s-based polymer electrolyte

• Published in: Journal of solid state electrochemistry 2020-10, Vol.24 (10), p.2479-2485
• Main Authors: Girard, Gaetan M. A., Wang, Xiaoen, Yunis, Ruhamah, Howlett, Patrick C., Forsyth, Maria
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Analytical Chemistry; Cathodes; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Cycles; Electrochemistry; Electrodes; Electrolytes; Energy Storage; Flux density; High voltages; Ionic liquids; Ions; Lithium; Molten salt electrolytes; Original Paper; Physical Chemistry; Polymers; Solid electrolytes; Solid state devices
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-020-04775-z

A poly(ionic liquid)s binder can provide stable performance of high-voltage composite cathodes based on lithium nickel cobalt aluminium oxide (LiNi 0.8 Co 0.15 Al 0.05 O 2 or NCA), up to 4.5 V (vs. Li + /Li 0 ) at 50 °C for an electrode with high areal capacity up to 1.6 mAh cm −2 . A reversible capacity of more than 150 mAh g −1 in an all-solid-state device using a highly concentrated poly(ionic liquid)s-based composite polymer electrolyte is achieved with high-capacity retention on cycling. Characterization of the composite electrode and polymer electrolyte post-cycling using scanning electron microscopy confirms stable behaviour with only small volume changes evident. This report thus demonstrates these solid polymer electrolytes as promising for high energy density high-voltage all-solid-state lithium (Li) batteries. Graphical Abstract