Dry-Processed Solid-State Battery Electrode Film With Uniform Shear
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Solution Overview
Problem
The challenge in manufacturing all-solid state battery electrodes lies in achieving uniformity due to differences in particle sizes of the binder, electrode active material, and solid electrolyte, leading to irregular shear stress during the dry-manufacturing process, which is exacerbated by the need to reduce binder particle size, complicating the formation of a uniform electrode.
Innovation Solution
A method is developed to prepare an electrode active material complex by coating a solid electrolyte on the electrode active material, followed by mixing with a binder, ensuring a controlled particle size ratio and minimizing irregular shear stress, thereby forming a uniform electrode using a reduced amount of binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the binder particle size is reduced to improve uniformity of shear stress distribution, then the uniformity of electrode manufacturing is improved, but the binder becomes difficult to fiberize due to lowered molecular weight
Solution Approach 1:
The binder is pre-treated through a specific process before being mixed with electrode active material and solid electrolyte. This preliminary treatment modifies the binder's physical properties to enable better fiberization while maintaining the ability to achieve uniform shear stress distribution in the final electrode structure.
2Manufacturing precision
If the wet-manufacturing manner is used to achieve uniform mixing of materials, then the uniformity of electrode composition is improved, but the manufacturing process becomes more complex and costly due to additional drying steps
Solution Approach 1:
The patent replaces the wet-manufacturing mechanical system (slurry preparation, coating, drying) with a dry-manufacturing approach that uses mechanical mixing and fiberization processes. This substitution eliminates the need for solvent-based slurry and subsequent drying steps, simplifying the overall manufacturing process while maintaining composition uniformity.
3Ease of manufacture
If the dry-manufacturing manner is used to reduce process costs by eliminating drying steps, then the manufacturing cost is reduced, but the uniformity of shear stress application deteriorates due to different particle sizes of mixed materials
Solution Approach 1:
The patent changes the physical parameters of the binder (through pre-treatment) and controls the particle size relationships between binder, electrode active material, and solid electrolyte. By adjusting these parameters, the mixture achieves clay-like status with uniform shear stress distribution during rolling, maintaining manufacturing precision while keeping the dry-manufacturing cost advantage.
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 results in a uniformly distributed solid electrolyte, enhancing electrode uniformity and performance, allowing for stable electrode film formation with a smaller binder content, thus improving the efficiency and stability of the all-solid state battery.
Implementation Method 1
preparing an electrode active material complex by coating a solid electrolyte on the electrode active material
Implementation Method 2
the uniformity of a shear stress applied to the mixture during the needing process
Data Source
AI summary
Provided are a method for dry-manufacturing an electrode for an all-solid state battery, an electrode free standing membrane prepared through the manufacturing method, an electrode, and an all-solid state battery including the same. This dry process eliminates solvents, making it environmentally friendly and efficient. The method involves forming an electrode active material complex by mixing the active material with a solid electrolyte, combining it with a conductive material and binder, and then rolling the mixture into an electrode film. The film is bonded to a current collector, ensuring strong adhesion and mechanical stability. The free-standing membrane enhances ion and electron conductivity, improving overall battery performance. The resulting all-solid-state battery offers higher energy density, longer cycle life, and increased safety, making it well-suited for electric vehicles, portable electronics, and advanced energy storage applications.