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Optimized Printed Cathode Electrodes for High Performance Batteries
Author(s) -
Gonçalves Renato,
Dias Pedro,
Hilliou Loic,
Costa Pedro,
Silva Maria M.,
Costa Carlos M.,
Corona-Galván Sergio,
Lanceros-Méndez Senentxu
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000805
Subject(s) - cathode , materials science , copolymer , dispersion (optics) , chemical engineering , styrene , polymer , solvent , electrode , rheology , composite material , organic chemistry , chemistry , engineering , physics , optics
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.