Polyether Porous Solid Electrolyte for Battery Flexibility
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Solution Overview
Problem
Solid electrolytes used in all-solid-state lithium secondary batteries have poor flexibility, making them prone to breakage under external forces and affecting battery cycle performance due to expansion and shrinkage of electrode active materials.
Innovation Solution
A solid electrolyte with a porous dielectric having interconnected pores of 20 nm to 100 nm diameter, filled with a metal salt and ionic or bipolar compounds, incorporating a polyether structure for enhanced flexibility and ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is made with inorganic porous dielectric (e.g., porous silica), then ionic conductivity can be improved, but flexibility deteriorates and the skeleton is prone to breakage under external force
Solution Approach 1:
The invention uses a composite material system consisting of inorganic porous dielectric particles (silica, alumina, etc.) combined with organic polymer materials (polyether, polycarbonate, etc.). This composite structure allows the inorganic component to provide ionic conductivity while the organic polymer component provides flexibility and mechanical strength, resolving the contradiction between ionic conductivity and flexibility.
Solution Approach 2:
The invention creates different regions with different properties: the inorganic porous dielectric particles provide localized high ionic conductivity pathways, while the organic polymer matrix provides localized flexibility and mechanical support. This local differentiation allows each material to contribute its superior property without being limited by the other's weaknesses.
2Productivity
If electrode active materials expand and shrink during charging and discharging, then battery capacity is improved, but solid electrolyte skeleton breaks due to poor flexibility
Solution Approach 1:
The organic polymer matrix acts as a cushioning layer that absorbs and accommodates the expansion and shrinkage of electrode active materials before they can damage the solid electrolyte skeleton. This beforehand cushioning effect protects the inorganic porous dielectric structure from mechanical breakage during battery cycling, maintaining cycle performance while allowing high capacity operation.
Solution Approach 2:
The invention changes the mechanical parameters of the solid electrolyte by introducing organic polymer components with appropriate glass transition temperatures and elastic moduli. These parameter changes allow the solid electrolyte to exhibit viscoelastic behavior, enabling it to accommodate volume changes of electrodes during charging and discharging without structural failure.
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 provides a solid electrolyte with improved flexibility and high ionic conductivity, effectively absorbing expansion and shrinkage of electrode active materials, enhancing battery cycle performance and mechanical durability.
Implementation Method 1
the porous dielectric includes a polyether structure
Implementation Method 2
an electrolyte including a metal salt and at least one selected from the group consisting of an ionic compound and a bipolar compound and at least partially filling an interior of the plurality of pores
Data Source
AI summary
A solid electrolyte of the present disclosure includes: a porous dielectric having a plurality of pores interconnected; and an electrolyte including a metal salt and at least one selected from the group consisting of an ionic compound and a bipolar compound and at least partially filling an interior of the plurality of pores. The porous dielectric includes a polyether structure. The plurality of pores have an average pore diameter of 20 nm or more and 100 nm or less.