Polymer Solid Electrolyte Thin Films via Phase Separation
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Solution Overview
Problem
Current all-solid batteries face challenges with voids at the interface between electrodes and solid electrolytes, leading to reduced ionic conductivity and difficulties in manufacturing thin film solid electrolytes due to weakened strength and adhesion issues during the separation process.
Innovation Solution
A method involving the use of a polymer and a non-volatile liquid-phase compound with poor miscibility, forming a liquid-phase film and a polymer solid electrolyte film through phase-separation, allowing for the production of a uniform thin film solid electrolyte by separating the polymer solid electrolyte film from the substrate without resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the solid electrolyte is made thin to reduce battery thickness, then the battery thickness is reduced, but the strength of the solid electrolyte weakens making it difficult to separate from the release film
Solution Approach 1:
The patent divides the coating layer into two distinct phases: a polymer solid electrolyte film phase and a non-volatile liquid-phase compound film phase. This segmentation allows the thin solid electrolyte film to be separated from the substrate through the liquid-phase film without direct contact, preventing damage even at reduced thicknesses.
Solution Approach 2:
The non-volatile liquid-phase compound acts as an intermediary layer between the polymer solid electrolyte film and the substrate. During the separation process, this liquid-phase film serves as a mediator that enables the thin solid electrolyte film to be detached from the substrate without direct mechanical stress, thus maintaining film integrity despite reduced strength.
2Manufacturing precision
If a polymer and non-volatile liquid-phase compound with poor miscibility are used, then a uniform thin film is formed through phase-separation, but the manufacturing process becomes more complex
Solution Approach 1:
The patent utilizes phase separation during the drying process of the coating layer. The poor miscibility between the polymer and non-volatile liquid-phase compound causes spontaneous phase separation, forming a uniform thin film structure with distinct polymer solid electrolyte film and liquid-phase compound film regions without requiring additional processing steps.
3Reliability
If the solid electrolyte interface has voids, then the ionic conductivity decreases, but adding more material to fill voids increases battery thickness
Solution Approach 1:
The patent employs a thin film structure where the non-volatile liquid-phase compound film acts as a flexible intermediary layer that conforms to the substrate surface. This thin film configuration ensures complete coverage and eliminates voids at the interface, maintaining high ionic conductivity without increasing battery thickness, as the liquid-phase film itself is extremely thin.
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 enables the production of a polymer solid electrolyte in the form of a uniform thin film with improved ionic conductivity and enhanced manufacturing efficiency, maintaining the strength and integrity of the electrolyte film.
Implementation Method 1
a liquid-phase film and a polymer solid electrolyte film are formed by the phase-separation that occurs when mixing and drying the raw materials
Data Source
AI summary
A method for preparing a polymer solid electrolyte, the polymer solid electrolyte prepared thereby, and an all-solid battery comprising the polymer solid electrolyte are provided. The method uses a polymer and a non-volatile liquid compound having poor miscibility with each other as raw materials, and a liquid-phase film and a polymer electrolyte film are formed by phase-separation that occurs when mixing and drying the raw materials, and the polymer solid electrolyte film exhibits the form of a uniform thin film.