Solid-State Battery Electrode Using Melted Electrolyte Impregnation
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Solution Overview
Problem
Existing methods for manufacturing all solid batteries face challenges such as high interfacial resistance, poor dispersion of electrode materials, and pore generation due to solvent evaporation, leading to increased resistance and contact issues between the electrode and electrolyte.
Innovation Solution
A method involving a polyimide-based high heat-resisting binder and a solid electrolyte with a melting temperature of 50° C to 500° C is used, where the solid electrolyte is melted and impregnated into the electrode pores, forming well-defined electron and ion pathways and improving bonding with the active material, eliminating the need for solvent drying and reducing pore-related resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dry-mixing method is used to manufacture solid battery electrode, then manufacturing process is simple, but interfacial resistance between current collector/electrode/electrolyte is high and contact between electrode material and electrolyte is not maintained
Solution Approach 1:
The patent introduces a binder as an intermediary substance that mediates between the electrode materials (active material and conductive material) and the solid electrolyte. This binder creates effective point contacts and maintains continuous contact between all components, resolving the high interfacial resistance issue while keeping the dry-mixing manufacturing approach
Solution Approach 2:
The patent creates a composite electrode structure by combining four components: active material, conductive material, solid electrolyte, and binder. This composite approach ensures proper dispersion and maintains continuous contact between all components, solving the interfacial resistance problem inherent in simple three-component dry-mixing methods
2Stability of the object's composition
If wet-mixing method is used to manufacture solid battery electrode, then electrode material can be evenly dispersed, but solvent vaporization generates pores and increases resistance
Solution Approach 1:
The patent extracts and eliminates the solvent component from the wet-mixing process, achieving even material dispersion through dry-mixing of all components including the binder. This removes the source of pore formation while maintaining the dispersion benefits of wet-mixing
Solution Approach 2:
The binder serves as an intermediary that enables uniform material distribution without requiring solvent. It facilitates even dispersion of electrode materials while preventing pore formation, achieving the dispersion uniformity of wet-mixing without its harmful side effects
3Device complexity
If three kinds of electrode materials are mixed without binder, then manufacturing process is simple, but particles are not well dispersed and contact resistance is large
Solution Approach 1:
The binder acts as an intermediary substance that promotes uniform dispersion of particles and maintains continuous contact between electrode materials and solid electrolyte. It reduces contact resistance by ensuring effective point contacts without significantly complicating the manufacturing process
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 interfacial resistance, enhances bonding between the active material and electrolyte, and minimizes pore formation, resulting in improved electron and ion transfer pathways and increased battery performance.
Implementation Method 1
the solid electrolyte can be melted and impregnated into the pores in the electrode
Implementation Method 2
the solid electrolyte can be melted and impregnated into the pores in the electrode
Implementation Method 3
the solid electrolyte can be brought into contact with the surface of the active material in a wetting manner
Data Source
AI summary
A method for manufacturing an electrode for an all solid battery including the steps of coating a current collector with a slurry including an active material, a conductive material, and a polyimide-based binder; and melting a solid electrolyte having a melting temperature of 50° C. to 500° C. and applying it onto the coating layer and an electrode manufactured therefrom.