Organic Radical Polyimide Electrode for Flexible High-Energy Batteries
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Solution Overview
Problem
Existing electrode materials for secondary batteries, particularly inorganic materials, are prone to cracking when bent, making them unsuitable for flexible ultrathin batteries, and organic radical polymers with high heat resistance are difficult to develop due to low radical density and conductivity issues.
Innovation Solution
A novel organic radical polyimide with high radical density, represented by Formula 1, is synthesized, which can be formed into a flexible ultrathin film, providing stable oxidation-reduction reactions and improved heat resistance, allowing it to be used as an electrode material without compromising when mixed with inorganic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If inorganic electrode materials are made thin, then the battery can be ultrathin, but the materials are easily cracked and destroyed when bent
Solution Approach 1:
The patent changes the fundamental material parameter from inorganic to organic polymer, enabling the electrode to be both ultrathin and mechanically flexible. The organic radical polymer structure inherently provides flexibility while maintaining electrochemical functionality, resolving the contradiction between thinness and mechanical strength.
Solution Approach 2:
The patent creates a composite structure by incorporating inorganic electrode materials into the organic radical polymer matrix. This composite approach allows the inorganic materials to provide high capacity while the organic polymer provides flexibility and prevents cracking, simultaneously achieving ultrathin profile and mechanical strength.
2Adaptability or versatility
If organic radical polymers are used to achieve flexibility, then the battery can be flexible, but the heat resistance is low
Solution Approach 1:
The patent modifies the chemical structure parameters of the organic radical polymer by introducing specific rigid aromatic groups and conjugated structures. These structural modifications elevate the glass transition temperature and thermal decomposition temperature, achieving heat resistance comparable to inorganic materials while preserving the inherent flexibility of organic polymers.
3Quantity of substance
If inorganic electrode materials are mixed with organic radical polymer to increase electrode capacitance, then the electrode density increases, but the polymer chains tend to keep away from each other
Solution Approach 1:
The patent utilizes the porous structure formed by the mixed matrix of inorganic particles and organic polymer chains. The porous architecture increases the surface area and provides more active sites for electrochemical reactions, enhancing electrode capacitance while maintaining adequate polymer chain proximity through the porous network structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The organic radical polyimide enables the creation of high-energy-density batteries with enhanced flexibility and thermal stability, suitable for next-generation batteries, including lithium secondary batteries, and can be applied to various electrochemical devices like organic solar cells and transistors.
Implementation Method 1
which has high radical density and induces a stable oxidation-reduction reaction
Data Source
AI summary
Disclosed herein is an organic radical polyimide, represented by Formula 1 below:The organic radical polyimide can be applied to a cathode, an anode or the like, and can be widely applied to an organic solar cell, an organic transistor, organic memory or the like. Further, the organic radical polyimide can be used to manufacture a secondary battery having high energy density because it has high radical density. Further, the organic radical polyimide can be formed into an ultrathin film such as a polymer film and can be used to manufacture a flexible next-generation battery because it does not include metal components and causes a stable oxidation-reduction reaction.