Solid State Battery Electrode Crosslinking Binder
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solid state batteries face issues with low ion conductivity due to poor interfacial contact between electrodes and electrolytes, and rubber-based binders used in nonpolar solvents suffer from adhesion degradation, leading to separation of active materials and conductors.
Innovation Solution
A method for manufacturing electrodes involving a slurry with a rubber-based binder resin, an inorganic solid electrolyte, and an organic peroxide-based crosslinking initiator, applied to a current collector and processed under controlled temperature and vacuum to enhance crosslinking and adhesion, using a nonpolar solvent to maintain ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber-based binder is used with a nonpolar solvent to maintain ion conductivity, then ion conductivity is preserved, but adhesion deteriorates causing electrode separation
Solution Approach 1:
The patent changes the chemical parameters of the binder resin by introducing polar functional groups (carboxyl, hydroxyl, or amine groups) into the rubber-based binder structure. This parameter change enables the binder to maintain both good adhesion and compatibility with nonpolar solvents, resolving the contradiction between adhesion strength and ion conductivity preservation
Solution Approach 2:
The patent creates a composite binder system by combining rubber-based polymer with polar functional groups. This composite structure integrates the advantages of both rubber-based binders (solubility in nonpolar solvents, ion conductivity maintenance) and polar-functionalized binders (improved adhesion), achieving both goals simultaneously
2Strength
If a polar solvent is used to dissolve conventional binders like PVDF-HFP or SBR, then adhesion is improved, but ion conductivity deteriorates due to damage to the solid electrolyte
Solution Approach 1:
The patent modifies the binder resin parameters by incorporating polar functional groups into rubber-based polymers, changing its chemical properties to achieve both polar and nonpolar characteristics. This allows the binder to work effectively in nonpolar solvents while maintaining adhesion performance
Solution Approach 2:
The modified rubber-based binder acts as an intermediary substance that bridges the incompatibility between polar adhesion requirements and nonpolar solvent constraints. It provides the polar functionality needed for adhesion while being soluble in nonpolar solvents, protecting the solid electrolyte from damage
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 method achieves high binding force and ion conductivity, preventing separation of electrode active materials and improving interfacial adhesion, resulting in enhanced cycle characteristics and stability of solid state batteries.
Implementation Method 1
an organic peroxide-based crosslinking initiator
Implementation Method 2
crosslinking of the electrode layer is initiated and performed
Implementation Method 3
a nonpolar solvent is used in order to prevent such a decrease in conductivity of the lithium ion conductor
Implementation Method 4
pressing the electrode layer (a) to form an electrode layer (a′)
Implementation Method 5
warming the electrode layer (a′) to form an electrode layer (a′′), wherein step (S20) is carried out in a temperature range where no crosslinking is initiated, and step (S40) is carried out in a temperature range where crosslinking of the electrode layer (a′′) is initiated and performed
Data Source
AI summary
An electrode for a solid state battery is provided. The electrode active material layer of the electrode shows improved mechanical properties, such as elasticity or rigidity, of the electrode layer through the crosslinking of a binder resin. Thus, it is possible to inhibit or reduce the effect of swelling and/or shrinking of the electrode active material during charging/discharging. Therefore, the interfacial adhesion between the electrode active material layer and an electrolyte layer and the interfacial adhesion between the electrode active material layer and a current collector are maintained to a high level to provide a solid state battery having excellent cycle characteristics.