Organic Radical Polyimide Electrode Active Material and Electrochemical Device Comprising the Same

Flexible Thin-Film Electrodes Using Heat-Resistant Polyimide Based on Multi-Organic Radical Diamines

This technology utilizes a novel polyimide, in which two or more organic radical groups are bonded to a diamine component, as an electrode active material. It achieves thermal stability through intra-chain reactions within the polymer and enables the implementation of flexible, film-type electrodes.

Conventional inorganic-based electrodes suffer from low flexibility, making them prone to cracking when bent. Even when organic radical polymers are used, they face limitations such as low heat resistance and difficulty in achieving sufficient electrode capacity.

This technology utilizes a specific polyimide structure with organic radical groups bonded to a pyrrolidine ring and its precursor, soluble poly(amic acid). By creating ultra-thin film electrodes through a solution process followed by thermal imidization, it simultaneously achieves heat resistance and high-density redox reactions. It can be applied to thin-film power sources for flexible displays, smart cards, and skin-attachable sensors, offering the potential to manufacture metal-free, bend-resistant organic electrodes via printing processes.

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Key Features:

• Organic radical polyimide of Chemical Formula 1, where A is an aryl group having 6 to 24 carbon atoms and an organic radical group is bonded to the pyrrolidine ring
• B is a substituent selected from an aryl group, or an alkyl or alkoxy group having 1 to 6 carbon atoms, capable of forming a condensed ring with an adjacent pyrrolidine ring
• An electrode used as a cathode for electrochemical devices such as lithium secondary batteries, comprising the organic radical polyimide of Chemical Formula 1
• An electrochemical device comprising a cathode, an anode, a separator, and an electrolyte, wherein the organic radical polyimide is applied to at least one of the electrodes

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