Impact Resistant Electrolyte via Shear Thickening
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Solution Overview
Problem
Advanced high energy batteries face stability and safety issues due to the volatility and flammability of current electrolyte materials, leading to potential fires and catastrophic combustion, which hinders widespread implementation in automotive and aeronautic applications.
Innovation Solution
A passively impact-resistant composite electrolyte composition is developed, incorporating shear thickening ceramic particles with specific characteristics, such as a polydispersity index of no greater than 0.1 and an absolute zeta potential of greater than ±40 mV, combined with an electrolyte solvent and up to 2M of an electrolyte salt, to provide mechanical resistance and enhance safety by preventing electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional organic electrolyte materials (dimethyl carbonate, ethylene carbonate, propylene carbonate) are used in advanced batteries, then high energy density is achieved, but volatility and flammability increase leading to fire hazards
Solution Approach 1:
The patent combines conventional organic electrolyte materials with shear-thickening ceramic particles to create a composite electrolyte system. This composite approach allows the battery to maintain high energy density from the organic electrolyte while the ceramic particles provide fire resistance and impact protection, directly resolving the contradiction between energy density and flammability.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the electrolyte system by incorporating ceramic particles with specific properties (polydispersity index ≤ 0.1, particle size 50 nm to 1 μm, zeta potential > ±40 mV). These parameter changes enable the electrolyte to exhibit shear-thickening behavior, transforming from a purely flammable liquid to a composite material with fire-resistant characteristics while maintaining high energy density.
2Reliability
If shear thickening ceramic particles are added to the electrolyte, then impact resistance and fire safety are improved, but manufacturing precision requirements increase due to specific particle specifications
Solution Approach 1:
The patent specifies precise particle parameters (polydispersity index ≤ 0.1, size 50 nm to 1 μm, zeta potential > ±40 mV) to optimize shear-thickening behavior. By carefully controlling these parameters, the invention achieves reliable impact resistance while providing clear manufacturing specifications that balance precision requirements with manufacturability.
Solution Approach 2:
The patent applies local quality by specifying particular properties for the ceramic particles at different stages of the manufacturing process. The heat treatment step (≥80°C under negative pressure) and the controlled addition to electrolyte (20-40 wt%) ensure that the ceramic particles achieve the desired local properties for shear-thickening while maintaining overall manufacturing feasibility.
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 solution significantly improves the stability and safety of batteries by forming a solid barrier upon impact, preventing cathode-anode contact and reducing the risk of fires, while maintaining compatibility with conventional manufacturing technologies and enhancing ionic conductivity.
Implementation Method 1
a passively impact resistant composite electrolyte composition that undergoes a passive shear thickening phenomenon upon application of an external force
Implementation Method 2
an absolute zeta potential of greater than ±40 mV
Data Source
AI summary
A passively impact resistant composite electrolyte composition includes an electrolyte solvent, up to 2M of an electrolyte salt, and shear thickening ceramic particles having a polydispersity index of no greater than 0.1, an average particle size of in a range of 50 nm to 1 μm, and an absolute zeta potential of greater than ±40 mV.