Boron Nitride Polysiloxane Solid Electrolyte for Higher Ion Conductivity
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Solution Overview
Problem
Current lithium ion batteries using liquid electrolytes face issues such as leakage, explosion, and limited design flexibility due to their thickness and weight, which are not suitable for miniaturization and flexibility requirements, necessitating the development of a solid electrolyte with improved ion conductivity.
Innovation Solution
A polysiloxane-based solid electrolyte incorporating boron nitride (BN) as a filler, surface-modified with polyethylene glycol-pyrene, is developed, which enhances ion conductivity and mechanical stability, and is prepared through a method involving surface modification of BN, mixing with a polysiloxane, lithium salt, and a crosslinking agent, followed by casting and curing.
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 such as leakage, volatilization, and explosion occur
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using a polymer electrolyte membrane, fundamentally altering the safety characteristics while maintaining ion conductivity functionality
Solution Approach 2:
The patent uses a composite structure combining polymer electrolyte with inorganic fillers (such as TiO2, SiO2, or Al2O3 particles) to enhance both safety and ion conductivity, creating a material that leverages properties of both components
2Reliability
If solid-phase polymer electrolyte is used to improve safety, then leakage and explosion risks are reduced, but ion conductivity decreases to 10^-5 to 10^-6 S/cm at room temperature
Solution Approach 1:
The patent introduces inorganic filler particles with porous structures or surface features that create additional pathways for ion transport, effectively increasing the overall ion conductivity of the solid polymer electrolyte while maintaining its safety advantages
Solution Approach 2:
The patent creates a composite electrolyte system where inorganic fillers (TiO2, SiO2, Al2O3) are dispersed within the polymer matrix, synergistically combining the safety and mechanical stability of solids with enhanced ion conductivity through the filler properties and interfacial effects
3Quantity of substance
If filler is introduced to improve ion conductivity and mechanical strength, then conductivity increases, but dispersibility limitations prevent achieving high ion conductivity
Solution Approach 1:
The patent employs surface treatment agents or coupling agents as intermediaries between the inorganic filler particles and the polymer matrix, improving interfacial compatibility and ensuring uniform dispersion of fillers, which enables achieving high ion conductivity without aggregation issues
Solution Approach 2:
The patent modifies surface parameters of the filler particles through chemical or physical treatment, altering surface energy, charge, or wettability to enhance compatibility with the polymer electrolyte matrix and achieve uniform dispersion
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 resulting solid electrolyte exhibits improved ion conductivity and thermal stability, enabling the creation of thinner, more flexible batteries with enhanced performance and safety, suitable for next-generation energy storage applications.
Implementation Method 1
there is a need for technology development to improve the ion conductivity of the solid electrolyte through the development of a filler that can further increase the free volume of the solid electrolyte
Implementation Method 2
a solid-phase polymer electrolyte having high ion conductivity (>10−4 S/cm, 25° C.)
Data Source
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.