Anionic Polymer Solid Electrolyte for Low-Temperature Ion Conductivity
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Solution Overview
Problem
Existing solid electrolyte materials face a decrease in ion conductivity when stored at low temperatures due to crystallization of plastic crystals and insufficient plastic crystal structure effects in molecular crystals.
Innovation Solution
A solid electrolyte material comprising a polymer electrolyte, an inorganic filler, and succinonitrile, where the polymer electrolyte contains an anionic polymer, and the inorganic filler is SiO2 or Al2O3, is used to suppress crystallization and maintain ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic crystal is used to improve ion conductivity of the solid electrolyte, then high ion conductivity can be exhibited even in a low temperature range, but the plastic crystal is crystallized when the solid electrolyte is stored for a long term at low temperature, resulting in a decrease in ion conductivity
Solution Approach 1:
The patent uses a composite material system consisting of a polymer electrolyte matrix combined with a plastic crystal (1,3-propanesultone). The polymer electrolyte provides structural stability and prevents crystallization, while the plastic crystal maintains high ion conductivity. This composite approach resolves the contradiction by combining the stabilizing effect of the polymer with the conductive effect of the plastic crystal.
Solution Approach 2:
The patent changes the physical and chemical parameters of the solid electrolyte system by introducing specific plastic crystals (1,3-propanesultone) with controlled melting points and molecular structures. By adjusting the composition ratio and molecular parameters, the system maintains a stable amorphous or liquid crystalline state at low temperatures, preventing crystallization while preserving ion conductivity.
2Ease of operation
If a molecular crystal is used to provide flexibility and ion conductivity, then the solid electrolyte shows improved flexibility, but a sufficient plastic crystal structure effect cannot be exerted
Solution Approach 1:
The patent creates a composite system where the polymer electrolyte provides flexibility and the plastic crystal (1,3-propanesultone) provides ion conductivity. The synergistic combination allows both properties to be achieved simultaneously, with the polymer matrix enabling mechanical flexibility and the plastic crystal domains maintaining efficient ion transport pathways.
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 proposed solid electrolyte material effectively suppresses a decrease in ion conductivity even when stored for extended periods at low temperatures, maintaining high conductivity.
Implementation Method 1
the inorganic filler suppresses crystallization of the polymer electrolyte
Implementation Method 2
a solid electrolyte material comprising a polymer electrolyte, an inorganic filler and succinonitrile
Data Source
Figure 1
AI summary
A solid electrolyte material (3) configured to suppress a decrease in ion conductivity, the solid electrolyte material comprising a polymer electrolyte, an inorganic filler and succinonitrile, the polymer electrolyte comprises an anionic polymer.