Cross-Linked Polyrotaxane Solid Electrolyte for Safe Ion Conduction
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Solution Overview
Problem
Lithium secondary batteries face challenges with liquid electrolytes due to electrode material deterioration, volatility, combustion risks, and limited ion conductivity of solid electrolytes, which affect their stability and performance in diverse environments.
Innovation Solution
A solid electrolyte composition incorporating a polyrotaxane compound, a cross-linking agent, and a lithium salt, thermally cured to enhance ion conductivity and mechanical properties, forming a flexible and stable electrolyte for improved lithium secondary battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid electrolyte is used, then ion conductivity is high, but safety deteriorates due to combustion risk and volatility
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid by using cross-linked polyrotaxane gel, thereby eliminating combustion risk and volatility while maintaining functional performance
Solution Approach 2:
The patent creates a composite gel electrolyte system combining polyrotaxane polymer matrix with lithium salt and cross-linking agents, achieving both safety of solid and ion conductivity of liquid through synergistic material combination
2Reliability
If a solid electrolyte is used, then safety is improved, but ion conductivity deteriorates at room temperature
Solution Approach 1:
The patent modifies the molecular structure parameter by introducing cross-linking bonds in the polyrotaxane gel, creating a three-dimensional network that facilitates ion transport pathways while maintaining solid-state safety
Solution Approach 2:
The patent creates a gel phase that exhibits properties intermediate between solid and liquid, allowing ion mobility characteristic of liquids while maintaining the structural stability and safety of solids
3Productivity
If ion conductivity of solid electrolyte is increased, then productivity is improved, but electrochemical window deteriorates
Solution Approach 1:
The patent optimizes the cross-linking density parameter to achieve a balance between ion conductivity and electrochemical stability, preventing excessive cross-linking that would reduce the electrochemical window
Solution Approach 2:
The patent creates localized ion transport channels within the cross-linked gel structure, allowing high ion conductivity in specific regions while maintaining overall electrochemical stability of the bulk material
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 enhanced flexibility, tensile strength, and ion conductivity, leading to improved stability and performance of lithium secondary batteries, addressing the limitations of existing electrolytes.
Implementation Method 1
a cross-linking agent, a lithium salt, and an organic solvent, wherein the cross-linking agent includes a compound represented by Formula 1 below and a compound represented by Formula 2
Implementation Method 2
a lithium salt, and an organic solvent
Implementation Method 3
a method for preparing a solid electrolyte for a lithium secondary battery including thermal-curing the composition for preparing a solid electrolyte
Data Source
Figure 1(a)~2(b)
Figure 3~4
Figure 5(a)~5(b)
AI summary
The present invention relates to a composition for preparing a solid electrolyte including a polyrotaxane compound, a cross-linking agent, a lithium salt, and an organic solvent, wherein the cross-linking agent includes a compound represented by Formula 1 and a compound represented by Formula 2, a method for preparing a solid electrolyte for a lithium secondary battery including thermal-curing the composition, a solid electrolyte for a lithium secondary battery including a thermo-cured product of the composition, and a lithium secondary battery including the solid electrolyte.