Optimized Printed Cathode Electrodes for High Performance Batteries. Issue 1 (9th November 2020)

• Record Type: Journal Article
• Authors: Gonçalves, Renato; Dias, Pedro; Hilliou, Loic; Costa, Pedro; Silva, Maria M.; Costa, Carlos M.; Corona-Galván, Sergio; Lanceros-Méndez, Senentxu
• Is Part Of: Energy technology. Volume 9:Issue 1(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-11-09
• Subjects: cathodes -- dispersion methods -- printed lithium-ion batteries -- styrene–butadiene–styrene -- styrene–ethylene/butylene–styrene; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202000805
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : Increasing mobility, sensing, and interconnection needs is driving the need for low cost and environmental friendly energy storage systems, and therefore, printed batteries represent one of the most appealing solutions. To identify materials‐processing conditions–performance relationships to design improved screen‐printed batteries, the effects of the ink preparation method and the chemical structure of the polymer binder on batteries performance are studied. Screen‐printed cathodes with "green" solvent cyclopentyl methyl ether (CPME) are produced using different styrene‐block‐copolymers (SBC) with different ethylene/butylene ratios and using three dispersion methods of the cathode components. It is shown that a limited amount of ethylene in the copolymer binder enhances the discharge capacity for 5C and C/5 rates (105 and 142 mAh g −1, respectively). The ink preparation methods affect cathode performance in a larger extent than the chemical structure of the binder. The sequential addition of active and conductive materials to the styrene–ethylene/butylene–styrene solution results in a higher cathode charge/discharge capacity compared with the other explored dispersion methods (150/147 mAh g −1 for charge/discharge capacity). The optimized cathode performance is related with the improved degree of dispersion of the cathode components, as assessed by rheological properties of inks and by the morphological characterization of the printed cathodes. Abstract : The cathode electrode preparation, particle dispersion method, and polymer‐binder chemical composition are very important parameters that influence the battery performance. Herein, the effects of different cathode ink preparation methods, including different preparation protocols and polymer binders on cathode performance for printed lithium‐ion batteries are evaluated and reported. Further, a green approach is also used during cathode processing.