Aramid Fibril Composite Electrolytes for Thin Solid-State Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in manufacturing thin solid-state composite electrolytes due to the lower mechanical strength of inorganic solid electrolytes, necessitating reinforcement, and the large size of aramid fiber pulp is impractical for very thin electrolytes.
Innovation Solution
Aramid polymer fibrils with specific dimensions (10-2000 nanometers in diameter, 0.2-3 millimeters in length, and 3-40 m²/g in specific surface area) are incorporated into a solid-state composite electrolyte, enhancing mechanical properties and flexibility, allowing for the production of thin electrolytes with improved fracture toughness and ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inorganic solid electrolyte is used to provide high ionic conductivity, then ionic conductivity is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent creates a composite electrolyte by combining inorganic solid electrolyte particles (providing ionic conductivity) with aramid polymer matrix (providing mechanical strength). The inorganic particles are dispersed within the polymer matrix, allowing the composite to simultaneously achieve high ionic conductivity from the inorganic phase and adequate mechanical strength from the polymer phase.
2Strength
If aramid fiber pulp is used as reinforcement to improve mechanical strength, then mechanical strength is improved, but the electrolyte thickness cannot be reduced below 100 micrometers
Solution Approach 1:
The patent changes the physical parameters of the reinforcement material by using ultrafine aramid fibers with diameter of 10-20 micrometers and length of 0.5-2 millimeters, along with specific aspect ratios and aspect ratio distributions. These parameter changes allow the fibers to be densely packed in thin electrolyte structures while maintaining mechanical strength, enabling electrolyte thickness reduction to 10-100 micrometers.
Solution Approach 2:
The patent optimizes the local distribution and orientation of aramid fibers within the electrolyte structure. By controlling fiber aspect ratio distribution and spatial arrangement, the reinforcement is efficiently distributed throughout the thin electrolyte matrix, providing adequate mechanical strength even at reduced thicknesses of 10-100 micrometers.
3Productivity
If very thin solid-state composite electrolytes are manufactured to improve battery efficiency, then productivity and energy density are improved, but mechanical strength becomes insufficient
Solution Approach 1:
The composite structure allows manufacturing of thin electrolytes (10-100 micrometers) by combining inorganic solid electrolyte particles for ionic conductivity with aramid polymer matrix for mechanical reinforcement. The synergistic combination enables thin-film fabrication while maintaining adequate mechanical strength for battery assembly and operation.
Solution Approach 2:
By optimizing fiber parameters (diameter 10-20 micrometers, length 0.5-2 mm, aspect ratio 25-200) and their distribution within the composite, the patent enables production of thin electrolyte films with sufficient mechanical strength, facilitating high-efficiency battery manufacturing and improved energy density.
Data Source
AI summary
A solid-state composite electrolyte, suitable for use in solid-state batteries, and a battery comprising same, the solid-state composite electrolyte comprising 70 to 99 weight percent inorganic solid electrolyte and 1 to 30 weight percent aramid polymer fibrils, based on the total weight of the inorganic solid electrolytes and aramid fibrils in the solid-state composite electrolyte, wherein the aramid polymer fibrils have:i) a diameter of 10 to 2000 nanometers,ii) a length of 0.2 to 3 millimeters,iii) a specific surface area of 3 to 40 square meters/gram, andiv) a Canadian Standard Freeness of 0 to 100 milliliters;the solid-state composite electrolyte having a thickness of 5 to 1000 micrometers.