Electrode Rolling With Acrylic Binder for Low-Moisture Li-S Battery
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Solution Overview
Problem
The use of aqueous binders in manufacturing lithium-sulfur battery electrodes requires a drying process to remove moisture, leading to increased manufacturing time and cost, and there are challenges in achieving high electrode adhesion strength and stability.
Innovation Solution
A method involving coating an electrode forming slurry with an acrylic binder on a current collector and rolling at temperatures of 105°C or more, eliminating the need for a separate drying step by utilizing the acrylic binder's moisture absorption properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aqueous binders are used in electrode manufacturing, then electrode adhesion strength is improved, but manufacturing complexity and cost increase due to required drying processes
Solution Approach 1:
The patent extracts and eliminates the drying process from the electrode manufacturing sequence by using non-aqueous binders (N-methyl-2-pyrrolidone, dimethyl carbonate, ethyl methyl carbonate) that do not require moisture removal. This removes the complex drying equipment and associated complexity while maintaining binder functionality.
Solution Approach 2:
The patent changes the fundamental parameter of binder solvent type from aqueous to non-aqueous. This parameter change fundamentally alters the manufacturing process requirements, eliminating the need for drying equipment while maintaining adequate adhesion strength through the selected non-aqueous binder chemistry.
2Strength
If aqueous binders are used in electrode manufacturing, then electrode adhesion strength is improved, but manufacturing time and cost increase
Solution Approach 1:
The drying step is completely extracted from the manufacturing process by using non-aqueous binders. This eliminates the time-consuming drying operation while maintaining electrode adhesion through the alternative binder chemistry, directly reducing total manufacturing time.
Solution Approach 2:
The patent skips the drying step entirely by selecting binders that do not introduce moisture requiring removal. This allows the manufacturing process to proceed directly from slurry coating to electrode formation, eliminating the time loss associated with drying operations.
3Quantity of substance
If sulfur-carbon composites with porous carbon materials are used, then sulfur loading capacity is improved, but binder adhesion requirements increase
Solution Approach 1:
The patent uses a composite binder system combining non-aqueous binders (N-methyl-2-pyrrolidone, dimethyl carbonate, ethyl methyl carbonate) that work synergistically to provide adequate adhesion to porous carbon materials while enabling high sulfur loading. The composite binder formulation addresses the adhesion challenge of porous structures.
Solution Approach 2:
The patent changes the binder parameter from aqueous to non-aqueous chemistry, which fundamentally alters the interaction mechanisms with porous carbon surfaces. This parameter change enables effective binding to high-surface-area porous materials without the complications of water removal, supporting both high sulfur loading and adequate adhesion.
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 reduces moisture content to 1,000 ppm or less, enabling cost and time savings while maintaining high electrode adhesion strength, suitable for lithium-sulfur battery applications.
Implementation Method 1
utilizing the acrylic binder's moisture absorption properties
Implementation Method 2
rolling at temperatures of 105°C or more, eliminating the need for a separate drying step
Data Source
AI summary
The present disclosure relates to a method for manufacturing an electrode, including: coating an electrode forming slurry on at least one surface of a current collector; and rolling the current collector coated with the electrode forming slurry, wherein the electrode forming slurry includes an electrode active material and an electrode binder, wherein the electrode binder includes an acrylic binder, and wherein the rolling is performed at a temperature of 105° C. or more, thereby manufacturing the electrode having low moisture content by using the rolling process in the manufacture of the electrode using the aqueous binder.