Electrode Shaping Material With Low Volatility to Limit Corrosion
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Solution Overview
Problem
Existing methods for producing electrodes in electrochemical devices face issues of corrosion of production equipment and odor due to the presence of lithium salts and volatile solvents like acrylonitrile.
Innovation Solution
A method using a shaping material for electrodes containing a specific ion conductor with ion conductivity of 10−4 S/cm at 5°C and low molecular weight organic compounds, limiting volatile compounds to 20% or less, to inhibit corrosion and odor during production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium salt is contained in ingredients of the positive electrode film, then electrochemical performance is improved, but corrosion of production equipment occurs
Solution Approach 1:
The patent extracts and removes lithium salt from the electrode film ingredients, replacing it with alternative materials that provide necessary electrochemical performance without causing equipment corrosion. This is achieved by using specific polymer electrolyte compositions and additives that eliminate the harmful lithium salt component while maintaining battery functionality.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrode film by substituting lithium salt with alternative compounds. The formulation adjusts the ratios of polymer electrolyte, plasticizer, and active materials to achieve the desired electrochemical performance without relying on lithium salt, thereby preventing equipment corrosion during production.
2Ease of manufacture
If a large amount of volatile solvent such as acrylonitrile is used, then electrode film formation is facilitated, but odor problems occur due to volatilization
Solution Approach 1:
The patent changes the solvent system parameters by replacing volatile solvents like acrylonitrile with less volatile alternatives. The new formulation uses solvents with higher boiling points and lower vapor pressures, enabling electrode film formation while minimizing odor and volatilization issues during manufacturing.
Solution Approach 2:
The patent employs a solvent system that requires minimal or no drying time, effectively eliminating the prolonged exposure to volatile organic compounds. The formulation allows for rapid solvent evaporation or alternative processing methods that prevent odor accumulation in the production environment.
3Reliability
If ion conductor with high ion conductivity is used, then electrochemical performance is improved, but corrosion of production equipment occurs
Solution Approach 1:
The patent creates a composite ion conductor material that combines multiple components to achieve the desired ion conductivity without using corrosive lithium salt. The composite formulation includes polymer electrolyte, plasticizer, and functional additives that work synergistically to provide high ion conductivity while being non-corrosive to production equipment.
Solution Approach 2:
The patent applies different functional materials in specific regions or proportions within the electrode film structure. The ion conductor composition is optimized locally to provide necessary conductivity in critical areas while using non-corrosive materials in other regions, balancing performance requirements with equipment protection.
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 effectively reduces equipment corrosion and odor occurrence, enabling high-capacity electrode production for various electrochemical devices.
Implementation Method 1
an ion conductor having an ion conductivity at a temperature of 5° C. of 10−4 S/cm or less, wherein the ion conductor includes a low molecular weight organic compound
Implementation Method 2
forming an electrode including a composite layer having a porosity of 10 volume % or less
Data Source
AI summary
Provided is a method of producing an electrode for an electrochemical device in which problems of corrosion of production equipment and odor have a low tendency to occur. The method of producing an electrode for an electrochemical device includes a step of forming an electrode including a composite layer having a porosity of 10 volume % or less using a shaping material for an electrode that contains an active material and an ion conductor having an ion conductivity at a temperature of 5° C. of 10−4 S/cm or less. The ion conductor includes a low molecular weight organic compound having a molecular weight of less than 10,000. The proportion constituted by a compound having an equal or higher volatilization rate than N-methylpyrrolidone among the low molecular weight organic compound is not less than 0 mass % and not more than 20 mass %.