Proton-Containing Binder for Water-Reactive Electrodes
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Solution Overview
Problem
Conventional binders for electrochemical devices, such as lithium-ion batteries, face issues with uniformity, adhesion, and stability, particularly when used with active materials that are reactive with water, leading to deterioration and reduced cycle endurance.
Innovation Solution
A binder containing a proton, such as alginic acid with a polar functional group, is used to neutralize alkaline conditions and improve adhesion and stability, allowing for the effective use of water-reactive active materials while minimizing binder content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aqueous binders (SBR, CMC) are used, then adhesion to active material and conductive auxiliary agent is improved, but binder content must be increased which reduces active material content rate
Solution Approach 1:
The invention changes the chemical parameters of the binder by introducing a proton-containing compound with specific functional groups (carboxyl, hydroxyl, or amine groups). This chemical modification enables the binder to achieve superior adhesion properties, allowing reduction of binder content while maintaining or improving electrode strength and uniformity.
2Ease of manufacture
If conventional binders are used, then electrode fabrication is simplified, but uniformity and strength of the electrode are insufficient
Solution Approach 1:
The invention modifies the chemical parameters of the binder system by using proton-containing compounds with specific functional groups that enhance uniformity and strength. These parameter changes maintain ease of manufacture while significantly improving electrode uniformity and mechanical strength.
3Quantity of substance
If water-reactive active materials are used, then energy density is improved, but binder must resist alkaline conditions which limits binder selection
Solution Approach 1:
The invention converts the harmful alkaline conditions generated by water-reactive active materials into a beneficial environment. The proton-containing binder neutralizes the alkaline conditions, transforming the harmful byproduct into a useful feature that enhances binder stability and electrode performance.
Solution Approach 2:
The proton-containing compound acts as an intermediary between water-reactive active materials and the binder system. It mediates the interaction by neutralizing alkaline conditions and providing stable adhesion, enabling the use of high-energy-density water-reactive materials without compromising binder compatibility.
4Quantity of substance
If binder content is reduced, then active material content rate is improved, but electrode strength and adhesion are compromised
Solution Approach 1:
The invention changes the quality parameters of the binder by using proton-containing compounds with specific functional groups. This enables the system to achieve higher strength and adhesion with reduced binder quantity, thereby increasing active material content rate while maintaining electrode integrity.
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 binder enhances the strength and uniformity of electrodes, improves charge-discharge characteristics, and maintains performance even with high-voltage operation, effectively addressing the limitations of existing binders.
Implementation Method 1
A binder containing a proton, such as alginic acid with a polar functional group, is used to neutralize alkaline conditions
Implementation Method 2
a binder containing a proton in a system thereof... improves adhesion and stability
Data Source
AI summary
An object of the present invention is to provide an aqueous binder which (i) allows suppressing deterioration of an active material having high reactivity with water so as to enable the use of the active material, (ii) allows ensuring high strength of an electrode with a small amount of the aqueous binder used, and (iii) allows achieving a high output characteristic and the like of the electrode. The binder binds an active material and a conductive auxiliary agent to each other, each of the active material and the conductive auxiliary agent being a material of an electrode for an electrochemical device, and contains a proton in a system of the binder.