Composite Solid Electrolyte for Low-Resistance Battery Interfaces
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Solution Overview
Problem
All-solid-state batteries face limitations in improving ion conductivity and electrical conductivity due to interfacial resistance in commercially available solid electrolytes, which restricts the enhancement of energy density and lifetime.
Innovation Solution
A solid electrolyte is developed using a mixed conducting polymer, ceramic, and lithium salt, with specific weight ratios and compositions, such as poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), oxide-based ceramics like ZnO, and lithium bis(trifluoromethanesulphonyl)imide (LiTFSI), to reduce interfacial resistance and enhance conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a commercially available solid electrolyte is used, then the battery structure is simple and easy to manufacture, but the ion conductivity and electrical conductivity are slightly decreased due to interfacial resistance
Solution Approach 1:
The patent applies composite materials by combining a polymer matrix with ceramic particles (such as TiO2, ZnO, SiO2, Al2O3, ZrO2, BaTiO3, Pb(Zr,Ti)O3, Pb1-xLaxZr1-yTiyO3, or SrTiO3) to create a solid electrolyte that achieves both high ion conductivity and electrical conductivity while reducing interfacial resistance. The ceramic particles dispersed in the polymer matrix provide multiple conduction pathways that overcome the limitations of single-material electrolytes.
Solution Approach 2:
The patent employs parameter changes by optimizing the composition ratios, particle sizes, and distribution of ceramic particles within the polymer matrix. By adjusting these parameters, the solid electrolyte achieves enhanced ion conductivity and electrical conductivity while maintaining manufacturability. The specific weight ratios and compositional ranges mentioned in the patent represent systematic parameter optimization.
2Ease of manufacture
If a commercially available solid electrolyte is used, then the battery structure is simple and easy to manufacture, but the energy density and lifetime are limited
Solution Approach 1:
The composite structure of polymer-ceramic solid electrolyte provides improved lifetime by combining the flexibility and processability of polymers with the stability and conductivity of ceramics. This composite approach creates a more durable electrolyte that maintains performance over extended battery operation cycles.
Solution Approach 2:
By optimizing compositional parameters and structural characteristics of the solid electrolyte, the patent extends battery lifetime while maintaining ease of manufacture. The controlled parameters include ceramic particle concentration, size distribution, and polymer-ceramic interface characteristics.
3Ease of manufacture
If a commercially available solid electrolyte is used, then the battery structure is simple and easy to manufacture, but the electrical conductivity is slightly decreased
Solution Approach 1:
The patent uses composite materials with conductive ceramic particles (such as TiO2, ZnO, SiO2, Al2O3, ZrO2, BaTiO3, Pb(Zr,Ti)O3, Pb1-xLaxZr1-yTiyO3, or SrTiO3) dispersed in a polymer matrix to create multiple electrical conduction pathways. This composite structure significantly enhances electrical conductivity while preserving the ease of manufacture associated with polymer-based electrolytes.
Solution Approach 2:
The patent optimizes electrical conductivity by systematically adjusting parameters including ceramic particle type, concentration, size distribution, and dispersion uniformity within the polymer matrix. These parameter changes enable high electrical conductivity to be achieved without complicating the manufacturing process.
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 solid electrolyte exhibits improved adhesive force and strength, leading to enhanced ion and electrical conductivity, thereby increasing the energy density and lifetime of all-solid-state batteries.
Implementation Method 1
a mixed conducting polymer having mixed conducting properties including ion conductivity and electrical conductivity
Implementation Method 2
The solid electrolyte exhibits improved adhesive force and strength
Implementation Method 3
a lithium salt comprised in the mixed conducting polymer matrix while being dissociated therein
Data Source
AI summary
A solid electrolyte and a method for manufacturing the same are provided. The solid electrolyte comprises a mixed conducting polymer having mixed conducting properties including ion conductivity and electrical conductivity, a ceramic, and a lithium salt, and provides improved adhesive force and strength, thereby reducing interfacial resistance, and thus improving ion conductivity and electrical conductivity.