Cross-Linked Polymer Solid Electrolyte for Low-Crystallinity Ion Transport
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Solution Overview
Problem
Conventional polymer solid electrolytes face limitations in ionic conductivity due to high crystallinity, which reduces polymer chain mobility and hinders the movement of lithium ions, and the use of plasticizers complicates the preparation process.
Innovation Solution
A polymer solid electrolyte with a cross-linked structure and amorphous polymer chains is formed by cross-linkages between cross-linkable functional groups, solvents, and lithium salts, achieved through a method involving solution preparation, coating, freezing/thawing, and solvent exchange to enhance ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-temperature drying process is used to form a coating film, then the coating film can be formed, but the crystallization degree increases and ionic conductivity decreases
Solution Approach 1:
The patent changes the drying temperature parameter from high temperature (80°C or higher) to low temperature (room temperature or lower). This parameter change prevents the formation of hydrogen bonds between hydroxyl groups, thereby reducing crystallization degree and maintaining high ionic conductivity in the polymer solid electrolyte.
2Stability of the object's composition
If the crystallization degree of the polymer is increased, then the structural stability is improved, but the polymer chain mobility decreases and ionic conductivity is reduced
Solution Approach 1:
The patent changes the processing temperature parameter to maintain the polymer in an amorphous state with low crystallization degree. This parameter change simultaneously achieves structural stability through cross-linking while preserving polymer chain mobility and ionic conductivity.
3Reliability
If a plasticizer is added to improve polymer chain mobility, then ionic conductivity is improved, but the preparation process becomes more complex
Solution Approach 1:
The patent extracts and eliminates the need for plasticizers from the system. Instead of adding external plasticizing agents, the invention achieves high ionic conductivity through low-temperature processing that maintains amorphous structure and polymer chain mobility intrinsically.
Solution Approach 2:
The polymer solid electrolyte system serves itself by maintaining high ionic conductivity through controlled crystallization degree achieved via low-temperature drying. The system does not require external plasticizers to achieve the desired mobility and conductivity properties.
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 resulting electrolyte exhibits improved ionic conductivity, reduced brittleness, and increased ductility, maintaining stability and performance in all-solid-state batteries.
Implementation Method 1
a cross-linkage between cross-linkable functional groups
Implementation Method 2
freezing and thawing, and solvent exchange
Implementation Method 3
freezing and thawing
Implementation Method 4
exchanging the first solvent in the first polymer solid electrolyte with a second solvent
Data Source
AI summary
The present disclosure relates to a polymer solid electrolyte and a preparation method thereof. The polymer solid electrolyte includes a polymer including a cross-linkable functional group; a lithium salt; and a solvent including a first solvent and a second solvent, wherein the polymer solid electrolyte having a cross-linked structure and an amorphous polymer chain including the cross-linkable functional group, and wherein the cross-linked structure includes (a) a cross-linkage between cross-linkable functional groups, (b) a cross-linkage between the cross-linkable functional group and the first solvent, and (c) a linkage between the cross-linkable functional group and the lithium salt.