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Flexible organic cathodes with 3,4,9,10-perylenetetracarboxylic diimide (PDI) as the active component, carbon black (CB) as the conductive agent and thermoplastic polyurethane (TPU) as the elastomeric matrix are obtained in this work via a solution-based phase inversion approach. In the resulting PDI/CB/TPU cathodes, the mass ratios of the three components manifest profound influences on their composition, flexibility, conductivity and lithium storage behavior. The integrated PDI/CB/TPU cathode with optimized ratio can deliver impressive rate capability and good cycling stability in lithium ion batteries (LIBs). More importantly, the full LIBs with PDI/CB/TPU cathode and carbon cloth anode exhibit excellent electrochemical performances, which show no decay even at bending states, demonstrating the appealing prospects of the solution-processed organic cathodes in wearable secondary batteries. Obtained from a solution-based phase inversion approach, the flexible PDI/CB/TPU cathodes manifest excellent electrochemical performances and good mechanical stability in lithium ion batteries. Image 1 [ABSTRACT FROM AUTHOR]

An acid-assisted vacuum filtration approach is developed in this work to fabricate perylene diimide (PDI) and single wall carbon nanotube (SWCNT) based organic lithium ion battery (LIB) cathodes by using concentrated sulfuric acid (H 2 SO 4) as the solvent. PDI and SWCNT can be readily dispersed in H 2 SO 4 by the protonation of their aromatic frameworks, thus rendering the effective combination of them in the acidic solution. The resulting PDI/SWCNT films are highly appealing flexible cathodes for LIBs by associating the intriguing electrochemical activity of PDI with the excellent electric conductivity and mechanical stability of SWCNT. Either with lithium foils or pre-lithiated carbon clothes as the anodes, the LIBs with PDI/SWCNT cathodes can deliver highly stable electrochemical performances in terms of rate capability and cycling stability. The PDI/SWCNT cathodes also have very good mechanical stability, enabling the LIBs based on them to reserve the battery performances at different bending states. The excellent electrochemical stability of the PDI/SWCNT cathodes is attributable to the acidic solution based processing method, which is expected to be expanded in the electrode fabrication of various organic secondary batteries with π-conjugated components. An acid-assisted vacuum filtration approach is developed in this work to fabricate perylene diimide (PDI) and single wall carbon nanotube (SWCNT) based flexible lithium ion battery (LIB) cathodes by using concentrated sulfuric acid as the solvent. The LIBs with the PDI/SWCNT cathodes manifest very stable electrochemical performances, attributable to the acidic solution based processing method. Image 1 • An acid-assisted vacuum filtration approach is developed to produce PDI/SWCNT cathodes. • PDI/SWCNT cathodes can deliver high capacities at high current densities. • LIBs with PDI/SWCNT cathodes show highly stable electrochemical performances. • LIBs with PDI/SWCNT cathodes also have very good flexibility. [ABSTRACT FROM AUTHOR]