Ionic Liquid Polymer Composite Electrolyte for Solid-State Battery Interfaces
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Solution Overview
Problem
Inorganic solid electrolytes exhibit high brittleness, poor flexibility, complex preparation processes, and poor interface contact with electrodes, leading to high internal resistance in solid-state batteries, while organic-inorganic composite electrolytes face issues like low mechanical strength, poor room-temperature ionic conductivity, and interface compatibility.
Innovation Solution
A polymer with a special molecular structure, comprising blocks represented by Formulas 1 and 2, is introduced, featuring ionic liquid groups for improved ion transport and urea groups for enhanced interface compatibility with inorganic solid electrolytes, forming a composite electrolyte with excellent electrochemical and mechanical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic solid electrolytes are used, then ionic conductivity and mechanical strength are improved, but flexibility and interface contact are worsened
Solution Approach 1:
The patent creates an organic-inorganic composite electrolyte by combining polymer electrolyte (organic) with inorganic solid electrolyte particles. This composite structure integrates the high mechanical strength of inorganic materials with the flexibility and processability of polymers, resolving the contradiction between strength and flexibility.
2Reliability
If inorganic solid electrolytes are used, then ionic conductivity is improved, but interface contact with electrodes is worsened
Solution Approach 1:
The composite electrolyte combines inorganic solid electrolyte particles (providing high ionic conductivity) with polymer matrix (providing good interface contact and flexibility). The polymer phase ensures intimate contact with electrode surfaces while the inorganic particles maintain high ionic conductivity pathways.
Solution Approach 2:
The patent creates different regions with different properties: the polymer matrix provides flexibility and interface contact at the boundaries with electrodes, while the inorganic solid electrolyte particles provide high ionic conductivity in the bulk. This local differentiation resolves the interface contact problem.
3Ease of operation
If polymer electrolytes are introduced to improve flexibility, then flexibility and processability are improved, but mechanical strength and room-temperature ionic conductivity are worsened
Solution Approach 1:
The patent reinforces the polymer electrolyte matrix by dispersing inorganic solid electrolyte particles throughout it. The inorganic particles act as reinforcing fillers that enhance mechanical strength while the polymer continuous phase maintains flexibility and processability.
4Ease of manufacture
If polymer electrolytes are introduced to improve flexibility, then processability is improved, but room-temperature ionic conductivity is worsened
Solution Approach 1:
The composite structure allows the polymer phase to provide excellent processability and flexibility, while the inorganic solid electrolyte particles create continuous pathways for ion transport, maintaining high ionic conductivity at room temperature despite the polymer matrix.
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 polymer-enhanced composite electrolyte improves ionic conductivity, mechanical strength, and interface compatibility, resulting in better electrochemical performance and extended service life of batteries.
Implementation Method 1
R3 is an ionic liquid-containing group... the polymer to have excellent electrochemical performance and mechanical strength when applied to a composite electrolyte
Implementation Method 2
urea groups for enhanced interface compatibility with inorganic solid electrolytes
Data Source
AI summary
The present application provides a polymer and use thereof. The polymer includes a first block represented by Formula 1 and a second block represented by Formula 2; R1 is selected from a substituted or unsubstituted C1-C30 alkyl, a substituted or unsubstituted polyether group, a substituted or unsubstituted C1-C30 alkoxy, and a substituted or unsubstituted C6-C60 aryl; R2 is selected from a substituted or unsubstituted polyether group, a substituted or unsubstituted C1-C30 alkyl, a substituted or unsubstituted C1-C30 alkoxy, a substituted or unsubstituted C6-C60 aryl and *-b1-S—S-b2-*; b1 and b2 are each independently selected from a substituted or unsubstituted C2-C15 chain alkyl or a substituted or unsubstituted C6-C60 aryl; and R3 is an ionic liquid-containing group. The special molecular structure of the polymer enables the polymer to have excellent electrochemical performance and mechanical strength when applied to a composite electrolyte.