Porous Polyimide Film for Solid Electrolyte Filling
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Solution Overview
Problem
All-solid-state batteries with solid electrolyte layers using porous polyimide films experience a decrease in battery capacity due to low filling performance and irregular pore diameters, leading to variations in lithium ion conductivity during repeated charge and discharge cycles.
Innovation Solution
The use of a porous polyimide film with a void ratio of 60% to 80% and a pore diameter of 0.1 μm to 10 μm, which enhances the filling performance of the solid electrolyte and ensures better contact between electrolyte particles, thereby maintaining battery capacity during repeated charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous polyimide film is used as a holding body for solid electrolyte, then the solid electrolyte can be held and structured, but the filling performance is low and pore diameter is irregular, leading to decreased battery capacity during repeated charge and discharge cycles
Solution Approach 1:
The patent employs a porous polyimide film as the holding body for solid electrolyte, utilizing the porous structure to accommodate and organize electrolyte particles. The porous material provides both structural support and adequate space for electrolyte filling, resolving the contradiction between holding capability and filling performance.
Solution Approach 2:
The patent optimizes specific parameters of the porous polyimide film, including void ratio (50-80%) and pore diameter (0.1-10 μm), to achieve uniform electrolyte distribution. By controlling these parameters, the patent ensures regular pore dimensions and improved filling performance, thereby maintaining battery capacity during repeated cycles.
2Stability of the object's composition
If the void ratio of porous polyimide film is too low (less than 60%), then the film structure is more compact, but the filling performance of solid electrolyte decreases and battery capacity deteriorates
Solution Approach 1:
The patent identifies and optimizes the void ratio parameter of the porous polyimide film, setting it within 50-80% to achieve optimal balance. This parameter control ensures sufficient space for electrolyte filling while maintaining adequate structural compactness, preventing both over-loose and over-dense structures.
Solution Approach 2:
The patent creates an optimized model of porous polyimide film with specific void ratio and pore diameter parameters, which serves as a template for achieving consistent electrolyte filling performance across production batches, ensuring reproducible battery capacity stability.
3Ease of manufacture
If the pore diameter of porous polyimide film is too large (over 10 μm), then the filling process is easier, but the contact between electrolyte particles is insufficient, leading to variations in lithium ion conductivity
Solution Approach 1:
The patent optimizes the pore diameter parameter within the range of 0.1-10 μm, finding the optimal balance between filling ease and particle contact. This parameter control ensures that pores are large enough for practical filling operations but small enough to ensure adequate contact between electrolyte particles for uniform lithium ion conductivity.
4Productivity
If the filling rate of solid electrolyte in pores is low (less than 55%), then the manufacturing process is simpler, but the lithium ion conductivity varies and battery capacity decreases
Solution Approach 1:
The patent determines and controls the filling rate parameter within 55% or higher, establishing this as the minimum threshold for acceptable performance. This parameter specification ensures sufficient electrolyte content for stable lithium ion conductivity while maintaining manufacturing feasibility.
Data Source
AI summary
An all-solid-state battery includes a positive electrode active material layer containing a positive electrode active material; a negative electrode active material layer containing a negative electrode active material; and a solid electrolyte layer containing a solid electrolyte and a porous polyimide film which holds the solid electrolyte. The porous polyimide film has a void ratio of 60% or more and 80% or less and a pore diameter of 0.1 μm or more and 10 μm or less.