Composite Solid Electrolyte Membrane Balancing Conductivity and Rigidity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current all-solid-state batteries face challenges with sulfide-based solid electrolytes having low mechanical rigidity and oxide-based solid electrolytes having low ionic conductivity, while polymer materials are unstable at high temperatures, limiting the performance and stability of the solid electrolyte membrane.
Innovation Solution
A method is developed to produce a composite solid electrolyte by electrospinning an oxide-based solid electrolyte membrane, removing the polymer, and impregnating it with a sulfide-based solid electrolyte using a precursor solution, repeating the impregnation and drying process multiple times to enhance ionic conductivity and mechanical properties without using polymer materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfide-based solid electrolyte is used, then ionic conductivity is improved, but mechanical rigidity deteriorates
Solution Approach 1:
The patent creates a composite solid electrolyte by combining oxide-based solid electrolyte (providing mechanical rigidity) and sulfide-based solid electrolyte (providing high ionic conductivity). The oxide-based electrolyte forms a porous support structure, while the sulfide-based electrolyte fills the pores, achieving synergistic effects that resolve the contradiction between mechanical strength and ionic conductivity.
2Strength
If oxide-based solid electrolyte is used, then mechanical properties are improved, but ionic conductivity deteriorates
Solution Approach 1:
The composite structure combines oxide-based solid electrolyte as a porous support framework (providing mechanical strength) with sulfide-based solid electrolyte as the active ionic conduction phase (providing high ionic conductivity). This composite approach allows the oxide component to provide structural integrity while the sulfide component delivers superior ionic transport properties.
3Ease of manufacture
If polymer materials are added to improve mechanical properties, then ease of manufacture is improved, but high-temperature stability deteriorates
Solution Approach 1:
The patent removes polymer materials from the solid electrolyte composition entirely. Instead of using polymers as binders or matrix materials, the invention employs an inorganic oxide-based electrolyte as the support structure, eliminating the high-temperature instability associated with organic polymers while maintaining manufacturability through the electrospinning process.
Solution Approach 2:
The patent changes the material composition parameters by using an inorganic oxide-based electrolyte instead of organic polymer materials. This parameter change fundamentally improves high-temperature stability by replacing temperature-sensitive organic components with thermally stable inorganic materials, while the electrospinning manufacturing process maintains ease of production.
4Use of energy by moving object
If sulfide-based solid electrolyte is used, then ionic conductivity is improved, but suppression of lithium dendrite formation deteriorates
Solution Approach 1:
The composite structure combines oxide-based solid electrolyte with high mechanical rigidity (which suppresses lithium dendrite formation) and sulfide-based solid electrolyte with high ionic conductivity. The rigid oxide framework physically constrains dendrite growth while the sulfide phase ensures efficient ion transport, resolving the contradiction between these two performance aspects.
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 composite solid electrolyte exhibits improved ionic conductivity and mechanical stability, enabling high-temperature performance and rapid charging capabilities for secondary batteries, with reduced voids and enhanced impregnation of the sulfide-based electrolyte.
Implementation Method 1
producing an oxide-based solid electrolyte membrane by electrospinning a mixture including an oxide-based solid electrolyte precursor and a polymer
Implementation Method 2
producing an oxide-based solid electrolyte support by removing the polymer inside the oxide-based solid electrolyte membrane
Implementation Method 3
causing the oxide-based solid electrolyte support to be impregnated with a sulfide-based solid electrolyte using a sulfide-based solid electrolyte precursor solution
Implementation Method 4
drying the solvent
Data Source
AI summary
Provided is a method of producing a composite solid electrolyte. The method includes step S10 of producing an oxide-based solid electrolyte membrane by electrospinning a mixture including an oxide-based solid electrolyte precursor and a polymer, step S20 of producing an oxide-based solid electrolyte support by removing the polymer inside the oxide-based solid electrolyte membrane, and step S30 of causing the oxide-based solid electrolyte support to be impregnated with a sulfide-based solid electrolyte using a sulfide-based solid electrolyte precursor solution including a sulfide-based solid electrolyte precursor and a solvent.