Thiazole-Azo Covalent Organic Framework for Stable Battery Electrodes
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Solution Overview
Problem
Current lithium ion batteries used for energy storage have high costs due to cobalt and nickel, and safety concerns due to frequent fires, necessitating the development of inexpensive and safe alternatives with stable electrode materials.
Innovation Solution
A covalent organic framework (COF) with a stable chemical structure, incorporating a thiazole-based linker and azo group for rapid two-electron transfer, is developed, featuring a regular hexagonal structure with pores for efficient ion conductivity and structural stability during repeated charge and discharge cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monomolecular organic materials or polymers are used as electrode materials, then the cost is reduced and safety is improved, but structural instability such as decomposition in electrochemical reaction and low electrical conductivity occur
Solution Approach 1:
The patent employs covalent organic framework (COF) composite materials that combine organic molecules with stable covalent bonds to form a structured composite. This composite structure integrates the low-cost and safety benefits of organic materials with the structural stability and conductivity of a framework architecture, resolving the contradiction between cost reduction and structural instability.
Solution Approach 2:
The patent utilizes porous COF structures with controlled pore sizes and channels that provide both structural stability and pathways for ion transport. The porous framework maintains structural integrity during electrochemical reactions while enabling efficient mass transport, thereby preventing decomposition and improving reliability.
2Stability of the object's composition
If COF is used to form stable molecular crystal to inhibit dissolution of organic layer, then structural stability is improved, but the complexity of forming periodic mesopores and achieving stable chemical structure increases
Solution Approach 1:
The patent segments the COF structure into repeating modular units with specific functional groups arranged in periodic patterns. This segmentation approach simplifies the formation of periodic mesopores by using standardized building blocks that self-assemble into ordered structures, reducing the complexity of creating stable molecular crystals with controlled porosity.
Solution Approach 2:
The patent optimizes parameters such as pore size, wall thickness, and functional group distribution to achieve stable chemical structures. By systematically adjusting these parameters during synthesis, the patent simplifies the formation process of periodic mesopores while maintaining structural stability and preventing decomposition during electrochemical cycling.
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 COF-based electrode exhibits excellent cycle stability, fast charge and discharge characteristics, and high ion conductivity, ensuring the battery's performance and safety without decomposition, making it suitable for industrial applications.
Implementation Method 1
form periodic mesopores to provide an effective ion transfer channel
Implementation Method 2
incorporating a thiazole-based linker and azo group for rapid two-electron transfer
Data Source
AI summary
A covalent organic framework and a method of preparing the same are disclosed. The covalent organic framework is used to produce an electrode material and includes a repeating unit represented by the following chemical formula:In the formula, A1, A2, and A3 are the same or different, and are independently a monocyclic or polycyclic aromatic ring, and R1 and R2 are the same or different, and are independently selected from hydrogen, a functional group containing at least one nitrogen, phosphorus, or sulfur, an unsubstituted or substituted C1-C6 alkyl group, an unsubstituted or substituted C2-C6 alkenyl group, an unsubstituted or substituted C2-C6 alkynyl group, and an unsubstituted or substituted C1-C6 alkoxy group.