A Bipolar-Type Organic Electrode Material Comprised of a Viologen–Naphthalene Diimide–Viologen Triblock for Li-Organic Batteries
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Organic cathode materials play a crucial role in the development of future energy storage devices. Their physicochemical properties, including power density, capacity, and cycling stability are being rapidly developed. In this study, we employed the bipolar-type organic battery that couples n-type naphthalene diimide and p-type viologen which can reversibly insert/extract the Li+ cations and dope/dedope the Br/TFSI anions. The synthesized molecule allowed a facile transport of cations and bulky anions, synergistically preventing undesired aggregation of molecules. Through the optimization of electrolyte concentration to alleviate the solubility of the electrode, the reversible capacity of the battery was enhanced by employing the second redox of viologen moieties. This bipolar-type lithium ion battery offers an attractive option for its low-cost and environmental friendliness.