Secondary Battery Electrode Mixture Without Slurry Drying
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Solution Overview
Problem
Conventional methods for producing secondary battery electrodes face challenges with production process control and quality, including sedimentation and gelation of slurries, and require long drying times, which increase costs and can result in residual solvents affecting battery performance.
Innovation Solution
A mixture composition for secondary battery electrodes using a binder, conductive aid, and a liquid component that can be used as a component in a liquid electrolytic solution, eliminating the need for solvent-based slurry preparation and drying, with the liquid component acting as a forming aid and remaining in the battery without affecting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional solvent-based slurry preparation and drying methods are used, then electrode mixture sheets can be produced, but production process control becomes difficult due to sedimentation and gelation of slurries, and long drying times increase costs
Solution Approach 1:
The invention extracts and eliminates the problematic solvent component from the slurry system. By using a solvent-free binder system where polytetrafluoroethylene forms fibrils through high shear treatment, the patent removes the source of sedimentation and gelation issues, thereby improving production process control without requiring long drying times
Solution Approach 2:
The invention changes the physical state and processing parameters of the binder material. By applying high shear treatment to transform polytetrafluoroethylene into fibrils, the patent creates a binder system that functions without solvents, eliminating the need for drying processes and improving both manufacturing precision and reducing time loss
2Reliability
If conventional solvent-based slurry preparation is used, then electrode mixture sheets can be produced, but residual solvents remain affecting battery performance
Solution Approach 1:
The invention extracts and eliminates solvents from the electrode mixture preparation process entirely. By using a solvent-free binder system where polytetrafluoroethylene fibrils provide binding functionality, the patent removes the source of residual solvent contamination, thereby improving battery performance reliability without introducing harmful residual solvents
Solution Approach 2:
The invention replaces permanent solvent components with a disposable-like processing approach where high shear treatment temporarily activates the binder, which then self-organizes into fibrils. This eliminates the need for solvent removal steps and prevents residual solvent issues that would compromise battery performance
3Ease of manufacture
If polytetrafluoroethylene is formed into fibrils by high shear treatment using a jet mill, then binder functionality is achieved, but production complexity and equipment requirements increase
Solution Approach 1:
The invention makes the high shear treatment capability universal by applying it to both the mixing and fibrillation processes. The same mixing equipment that combines electrode materials also performs the high shear treatment needed to form polytetrafluoroethylene fibrils, eliminating the need for separate jet mill equipment and simplifying the manufacturing process
Solution Approach 2:
The invention merges the binder formation process with the electrode mixture preparation process. By combining the high shear treatment step into the existing mixing operation, the patent integrates multiple functions into a single process step, reducing equipment complexity while maintaining binder functionality
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
This approach improves moldability and eliminates the need for solvent removal steps, reducing production costs and enhancing battery characteristics by using a liquid component with a boiling point of 90°C or higher, such as cyclic or chain carbonates, ethers, or ionic liquids, which do not adversely impact battery performance.
Implementation Method 1
a polytetrafluoroethylene resin is a polymer that readily forms fibrils, and when fibrillated is also used as a binder
Implementation Method 2
a method for producing an electrode in which polytetrafluoroethylene has been formed into fibrils by subjecting a mixture containing an active material and a polytetrafluoroethylene mixed binder material to a high shear treatment
Implementation Method 3
using a liquid component with a boiling point of 90°C or higher, such as cyclic or chain carbonates, ethers, or ionic liquids, which do not adversely impact battery performance
Data Source
AI summary
The present disclosure provides a mixture composition for a secondary battery electrode having good properties and a method for producing an electrode mixture sheet, an electrode mixture sheet, an electrode, and a secondary battery that contain the mixture composition for a secondary battery electrode. The mixture composition for a secondary battery electrode includes a binder, a conductive aid and/or an electrode active material, and a liquid component that can be used as a component in a liquid electrolytic solution.