Solid-State Electrolyte Film for Safer Lithium Batteries
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Summary
Problems
Lithium-ion batteries face issues with liquid electrolytes, such as leakage, stability, corrosion, flammability, and safety concerns, while solid electrolytes have low ionic conductivity and high interface impedance, which hinder their performance and reliability.
Innovation solutions
A solid-state electrolyte film comprising a lithium salt, two polymers with specific molecular weights and granular shape, and a solid-state electrolyte with controlled particle size, integrated into a single film to enhance ionic conductivity and mechanical strength, along with a gel structure and buffer structure to reduce interface impedance.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If polymer molecular weight is increased to improve mechanical strength, then film strength is improved, but film-forming capability and ion transport deteriorate
Why choose this principle:
The patent applies parameter changes by optimizing the molecular weight of PVDF within a specific range (60,000-1,800,000 g/mol) and controlling the weight ratio of polymer to solid electrolyte (1:0.05-1:2). These parameter optimizations balance mechanical strength, film-forming capability, and ion transport properties.
Principle concept:
If solid electrolyte particle size is reduced to improve ionic conductivity, then ionic conductivity is improved, but manufacturing precision and uniformity deteriorate
Why choose this principle:
The patent applies parameter changes by optimizing the particle size of solid electrolyte within a specific range (50 nm – 2 μm) and controlling the weight ratio parameters. These optimized parameters enable effective ion conduction while maintaining uniform dispersion and manufacturability.
Application Domain
Data Source
AI summary:
A solid-state electrolyte film comprising a lithium salt, two polymers with specific molecular weights and granular shape, and a solid-state electrolyte with controlled particle size, integrated into a single film to enhance ionic conductivity and mechanical strength, along with a gel structure and buffer structure to reduce interface impedance.
Abstract
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.