Composite Solid-State Electrolyte Film for Low Interface Impedance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries face issues with liquid electrolytes such as leakage, corrosion, flammability, poor safety, and low reliability, while solid electrolytes suffer from low ionic conductivity and high interface impedance, hindering their performance and safety.
Innovation Solution
A solid-state electrolyte film comprising a first lithium salt, first and second polymers, and a solid-state electrolyte with specific molecular weights and particle sizes, integrated into a single film structure, along with a gel and buffer structure to enhance ionic conductivity and reduce interface impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolytes are used in lithium-ion batteries, then high energy density and rapid charging are achieved, but safety issues arise including leakage, corrosion, flammability, and low reliability
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid, fundamentally altering the safety characteristics. The solid-state electrolyte film eliminates the harmful properties of liquid electrolytes (leakage, flammability, corrosion) while maintaining ionic conductivity through careful selection of solid materials and their compositional ratios
Solution Approach 2:
The patent creates a composite solid-state electrolyte film incorporating multiple components: lithium salts (providing ionic conductivity), polymers (providing structural framework and flexibility), and inorganic solid-state electrolyte particles (enhancing ionic conductivity and stability). This composite structure achieves both safety and performance requirements
2Reliability
If solid electrolytes are used to improve safety, then reliability is improved, but ionic conductivity at room temperature decreases and interface impedance increases
Solution Approach 1:
The patent combines organic polymers with inorganic solid-state electrolyte particles to create a composite structure that leverages the advantages of both materials. The inorganic particles provide high ionic conductivity pathways, while the polymer matrix ensures flexibility and good interfacial contact, collectively overcoming the low conductivity limitation of pure solid electrolytes
Solution Approach 2:
The patent optimizes the local composition and structure of the solid-state electrolyte film by controlling particle size distribution (50 nm to 2 μm) and spatial arrangement of different components. This creates localized regions with enhanced ionic conductivity while maintaining overall structural integrity and reducing interface impedance through improved contact with electrodes
3Ease of manufacture
If solid-state electrolyte film is integrated into a single film structure, then manufacturing process is simplified, but achieving high ionic conductivity and low interface impedance becomes more challenging
Solution Approach 1:
The patent merges multiple functional components (lithium salts, polymers, inorganic electrolyte particles) into a single integrated film structure. This consolidation simplifies the manufacturing process by eliminating the need for separate assembly steps while maintaining high ionic conductivity and low interface impedance through optimized internal architecture and component distribution
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
The solid-state electrolyte film achieves high ionic conductivity at room temperature, improves battery performance by reducing interface impedance, and simplifies manufacturing processes.
Implementation Method 1
the solid-state electrolyte film can have a high ionic conductivity at room temperature
Data Source
AI summary
A solid-state electrolyte film includes a first lithium salt, a first polymer, a second polymer, and a solid-state electrolyte. The first polymer has a weight average molecular weight of between 60,000 g/mol and 1,800,000 g/mol. The second polymer has a granular shape. The solid-state electrolyte has a granular shape and a particle size (D50) of between 50 nm and 2 μm.