Shear-Thickening Electrolyte for Impact-Resistant Batteries
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Solution Overview
Problem
Current solid electrolytes for batteries lack sufficient mechanical strength and conductivity, and their integration with electrodes is hindered by interfacial resistance, posing safety concerns due to the risk of battery fires and explosions from impact-induced short-circuiting.
Innovation Solution
A shear-thickening electrolyte solution is developed, comprising a polar solvent, an electrolyte, and functionalized ceramic fillers with an aspect ratio greater than 1:1, which form a solvation layer to enhance suspension and impart impact resistance while maintaining ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solid electrolytes are used to replace liquid electrolytes for impact resistance, then mechanical strength is improved, but ionic conductivity decreases
Solution Approach 1:
The patent creates a composite electrolyte system combining solid ceramic particles (providing mechanical strength and impact resistance) with liquid electrolyte (providing ionic conductivity). The ceramic particles are suspended in the liquid electrolyte to form a composite that exhibits both enhanced mechanical properties and maintained ionic conductivity, resolving the contradiction between strength and conductivity.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the electrolyte system by controlling ceramic particle size distribution, concentration, and surface treatment. These parameter changes optimize the balance between mechanical reinforcement from ceramic particles and ionic transport pathways through the liquid electrolyte, achieving both improved strength and maintained conductivity.
2Strength
If solid electrolytes are used to replace liquid electrolytes for impact resistance, then mechanical strength is improved, but electrochemical performance deteriorates due to interfacial resistance
Solution Approach 1:
The patent introduces surface treatment agents or coating layers on ceramic particles that act as intermediaries between the solid ceramic phase and the liquid electrolyte. These intermediaries reduce interfacial resistance by improving wetting and contact between phases, while maintaining the mechanical reinforcement benefits of the ceramic particles.
Solution Approach 2:
The composite structure with optimized phase distribution creates numerous interfaces between ceramic particles and liquid electrolyte, increasing the total interfacial area for ionic transport. This composite approach transforms the harmful interfacial resistance into beneficial multiple transport pathways.
3Strength
If stronger battery case is used to provide impact protection, then impact resistance is improved, but energy density decreases
Solution Approach 1:
The patent extracts the impact protection function from the battery case structure and transfers it to the electrolyte itself. By making the electrolyte shear-thickening through ceramic particle addition, the electrolyte provides its own impact resistance, eliminating the need for additional protective structural components and preserving energy density.
Solution Approach 2:
The electrolyte is given multiple functions: it serves as the ionic conductor for battery operation and simultaneously provides impact protection through shear-thickening behavior. This multi-functionality eliminates the need for separate protective structures, maintaining energy density while providing impact resistance.
4Strength
If ceramic filler is added to provide impact resistance, then mechanical strength is improved, but suspension stability deteriorates
Solution Approach 1:
The patent controls suspension stability by optimizing parameters including ceramic particle size distribution (using a mix of particle sizes), concentration, and surface treatment. These parameter changes create a stable suspension that maintains ceramic particle dispersion while providing shear-thickening impact resistance.
Solution Approach 2:
The patent applies different surface treatments or coatings to ceramic particles to modify their local properties. This local quality modification improves particle-electrolyte interactions and prevents aggregation, maintaining suspension stability while preserving the impact resistance properties of the ceramic filler.
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 shear-thickening electrolyte solution provides enhanced impact resistance and electrochemical stability, preventing short circuits and maintaining ionic conductivity, making it a potential replacement for commercial electrolytes in batteries.
Implementation Method 1
ceramic filler having an aspect ratio, length to width, of greater than 1:1 and being functionalized to provide terminal end groups that interact with the polar solvent to form a solvation layer around said ceramic filler and support the suspension of said ceramic filler in said polar solvent
Implementation Method 2
A shear-thickening electrolyte solution is developed, comprising a polar solvent, an electrolyte, and functionalized ceramic fillers with an aspect ratio greater than 1:1, which form a solvation layer to enhance suspension and impart impact resistance while maintaining ionic conductivity
Data Source
AI summary
A shear-thickening electrolyte solution includes a polar solvent; an electrolyte dissolved in said polar solvent; and ceramic filler dispersed in said polar solvent, said ceramic filler having an aspect ratio, length to width, of greater than 1:1 and being functionalized to provide terminal end groups that interact with the polar solvent to form a solvation layer around said ceramic filler and support the suspension of said ceramic filler in said polar solvent.