Oriented Fiber Polymer Film for Low-Impedance Solid Electrolytes
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Solution Overview
Problem
Existing polymer solid electrolytes for lithium-ion secondary batteries face challenges in achieving both low impedance and high strength, particularly at high temperatures, as reinforcement structures often increase impedance and may lead to short-circuiting.
Innovation Solution
A fiber-containing polymer film with a host polymer and oriented fibrous substances, where the fibrous substance is aligned parallel to the main surface, improving strength and reducing impedance, and incorporating specific polymer compounds for enhanced heat resistance and elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcement structures (fibrous substances) are introduced into polymer solid electrolyte to improve strength, then heat resistance and strength are improved, but impedance increases
Solution Approach 1:
The patent uses a composite structure combining polymer matrix with fibrous substances (organic or inorganic) to achieve both high strength and low impedance. The fibrous reinforcement provides mechanical strength and heat resistance, while the polymer matrix maintains ion conductivity, creating a synergistic composite material that resolves the contradiction between strength enhancement and impedance control
Solution Approach 2:
The fibrous substances are distributed within the polymer matrix to provide localized reinforcement where mechanical strength is needed, while maintaining the overall polymer structure's ion-conducting properties. This local reinforcement approach ensures strength improvement without uniformly increasing impedance throughout the entire electrolyte structure
2Ease of manufacture
If fibrous substances are arranged randomly in polymer solid electrolyte, then manufacturing is simplified, but strength and anisotropy are insufficient
Solution Approach 1:
The patent transitions from random three-dimensional distribution of fibers to a controlled two-dimensional oriented arrangement where fibers are aligned in substantially the same direction parallel to the main surface. This dimensional organization enhances mechanical strength and creates beneficial anisotropy while maintaining manufacturing feasibility through techniques like extrusion or stretching processes
3Strength
If fiber length in surface direction is increased to improve strength, then heat resistance improves, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates fibrous substances with predetermined lengths and orientations into the polymer matrix during the manufacturing process itself, rather than attempting to arrange longer fibers after fabrication. This preliminary incorporation of appropriately sized fibers during extrusion or casting achieves the desired surface-direction strength while avoiding the complexity of post-manufacturing fiber alignment
Data Source
AI summary
A fiber-containing polymer film contains a host polymer and fibrous substances. The fiber-containing polymer film has an orientation area where the fibrous substances are oriented in a direction substantially parallel to a main surface of the fiber-containing polymer film and in substantially the same direction.