Polysiloxane Solid Electrolyte With Modified BN for Ion Conductivity
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Solution Overview
Problem
Current lithium ion batteries using liquid electrolytes face safety issues such as leakage, volatility, and explosion, and solid electrolytes with fillers like boron nitride suffer from low ion conductivity due to limited free volume and dispersibility, hindering their application in high-energy density and flexible batteries.
Innovation Solution
A polysiloxane-based solid electrolyte is developed with surface-modified boron nitride using polycyclic aromatic hydrocarbons like pyrene, combined with a lithium salt, organic solvent, and crosslinking agent, enhancing ion conductivity through improved dispersibility and free volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolyte is used in lithium ion battery, then high ion conductivity is achieved, but safety problems occur such as leakage, volatility, and explosion
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using a polysiloxane polymer matrix, thereby eliminating safety issues associated with liquid electrolytes such as leakage, volatility, and explosion while maintaining ion conductivity through the solid polymer structure
Solution Approach 2:
The patent creates a composite solid electrolyte system by combining polysiloxane polymer with boron nitride filler and lithium salt, where the composite structure provides both the safety of solid state and the ion conductivity needed for battery operation
2Strength
If boron nitride filler is introduced to improve mechanical strength, then mechanical strength is enhanced, but ion conductivity remains low due to limited free volume and dispersibility
Solution Approach 1:
The patent applies local quality modification by specifically treating the surface of boron nitride particles with polycyclic aromatic hydrocarbon, creating a surface layer with different properties that improves dispersibility and maintains free volume for ion transport while preserving the bulk mechanical strength benefits
Solution Approach 2:
The patent introduces polycyclic aromatic hydrocarbon as an intermediary substance that mediates between the boron nitride filler and the polysiloxane matrix, improving the interface compatibility and dispersibility of the filler while maintaining pathways for ion conduction
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 modified solid electrolyte exhibits enhanced ion conductivity, enabling the production of flexible and high-energy density batteries with improved safety and mechanical stability.
Implementation Method 1
boron nitride (BN) surface-modified with a polycyclic aromatic hydrocarbon
Implementation Method 2
improved dispersibility and free volume
Implementation Method 3
lithium salt, organic solvent; a crosslinking agent; and boron nitride (BN) as a filler
Data Source
Figure 1
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AI summary
The present invention relates to a polymer electrolyte and a method for manufacturing same. More specifically, a polymer electrolyte with improved ion conductivity can be produced by adding boron nitride to a solid electrolyte comprising polysiloxane.