Modified Lignin Electrode Material for Acid-Stable Redox Storage
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Solution Overview
Problem
Current electrode materials for electrochemical energy storage devices, particularly those using lignin, face challenges with poor electrochemical performance and chemical stability, especially in acidic conditions due to high ether bond content, leading to instability during cycling.
Innovation Solution
Functionalizing lignin with aromatic moieties such as catechol, hydroquinone, or phenols substituted with an alkoxy group to increase phenolic hydroxyl groups, resulting in a modified lignin with enhanced redox activity and stability, achieved through a process involving a lignin source, reactant combination, and reaction in the presence of a strong acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lignin is used as electrode material, then cost and availability are improved, but electrochemical performance and chemical stability deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of lignin through functionalization with aromatic moieties (catechol, hydroquinone, or phenols with alkoxy groups). This increases the phenolic hydroxyl group content to at least 4.0 mmol/g, thereby improving redox activity and electrochemical performance while maintaining the cost-effective lignin base material
Solution Approach 2:
The patent creates a composite material by functionalizing lignin with aromatic compounds. The modified lignin combines the advantageous properties of lignin (availability, low cost) with the electrochemically active aromatic moieties, resulting in a composite that achieves both good availability and high electrochemical performance
2Quantity of substance
If lignin is used as electrode material, then cost and availability are improved, but chemical stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of lignin by introducing aromatic functional groups that increase phenolic hydroxyl content to ≥4.0 mmol/g. This modification enhances chemical stability, particularly in acidic conditions, while preserving the availability advantage of using lignin as a renewable resource
3Reliability
If lignin is functionalized to increase phenolic hydroxyl groups, then redox activity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent achieves improved redox activity by changing the chemical composition parameter - specifically increasing phenolic hydroxyl groups to at least 4.0 mmol/g through functionalization. While this adds a manufacturing step, the use of standard aromatic reactants and established functionalization protocols keeps the complexity increase manageable
Solution Approach 2:
The patent applies local quality by selectively functionalizing specific sites on the lignin structure with aromatic moieties. This targeted approach concentrates the redox-active groups where they are most effective, improving overall redox activity without requiring complete structural transformation of the entire lignin molecule
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 modified lignin exhibits improved electrochemical properties, including high redox activity and stability in acidic conditions, leading to a more efficient and long-lasting electrode material for energy storage devices.
Implementation Method 1
Lignin can store electric energy by exhange of protons/metal ions and electrons
Implementation Method 2
reacting the mixture at an elevated temperature for a predetermined time in the presence of a strong acid
Data Source
Figure 1
Figure 2a~2b
Figure 2c~2d
AI summary
The present inventive concept relates to an electrode material for use in an electrochemical storage device, comprising a modified lignin being a lignin functionalized with at least one aromatic moiety selected from the list of catechol, hydroquinone, and phenols substituted with an alkoxy group, wherein a total content of phenolic hydroxyl groups is at least 4.0 mmol/g, as determined by 31P Nuclear Magnetic Resonance Spectroscopy.