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An acidic solution based method towards flexible lithium ion battery (LIB) cathodes is developed in this work with perylene diimide (PDI) as the electroactive component and carbon cloth (CC) as the current collector.In this approach,PDI is firstly dispersed in concentrated sulfuric acid (H2SO4) and then deposited on CC substrate after the dilution of H2SO4,which provides an organic solvent-free strategy to construct integrated LIB cathodes.The acdic solution based fabrication process also allows the facile adjusting of loading amounts of PDI in the cathodes,which can effectively influence the battery performances of the PDI/CC cathodes.As the result,the acidic solution processed PDI/CC cathode can deliver a high specific capacity of ～ 36 mAh·g-1 at the current density of 50 mA·g-1 in both half cell with lithium foil as anode and full cell with prelithiated CC as anode.In both types of the batteries,the PDI/CC cathodes show good cycling stabilities by retaining ～ 84％ of the initial capacities after 300 charge-discharge cycles at 500 mA·g-1.Additionally,the excellent mechanical stability of the PDI/CC cathode enables the LIBs in pouch cell to maintain the electrochemical performances under various bending states,demonstrating their potentials for flexible LIBs.