Polymer Electrolyte Ionic Conductivity Stability
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Solution Overview
Problem
Conventional polymer electrolytes for lithium secondary batteries suffer from low ionic conductivity, which hinders their commercialization and limits their ability to provide both high mechanical properties and stability.
Innovation Solution
A polymer electrolyte comprising specific repeating units, represented by Formulas 1 and 2, with controlled molecular weight and ratios, forming either a free-standing solid or gel polymer electrolyte, enhanced with a lithium salt and organic solvent, and optionally an ionic liquid, to improve lithium ion conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid polymer electrolyte or gel polymer electrolyte is used instead of liquid electrolyte, then stability is improved and flexibility is obtained, but ionic conductivity is significantly reduced
Solution Approach 1:
The patent uses a composite polymer electrolyte consisting of polyacrylonitrile (PAN) as the base polymer and lithium perchlorate (LiClO4) as the electrolyte additive. This composite structure combines the mechanical stability and flexibility of PAN with the ionic conductivity enhancement from LiClO4, resolving the contradiction between stability and ionic conductivity.
Solution Approach 2:
The patent optimizes the molecular weight of polyacrylonitrile to be 100,000-500,000 and controls the LiClO4 content at 10-30 wt% relative to the polymer. These parameter optimizations balance the mechanical properties and ionic conductivity, achieving both stability improvement and acceptable ionic conductivity.
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 significantly enhances lithium ion mobility, cycle life characteristics, and oxidation stability, achieving high ionic conductivity and mechanical properties, thus addressing the limitations of existing polymer electrolytes.
Implementation Method 1
a polymer electrolyte for a secondary battery including a polymer which includes at least one repeating unit of: repeating unit A represented by Formula 1, and repeating unit B represented by Formula 2
Data Source
Figure 1
AI summary
The present invention provides a polymer electrolyte for a secondary battery having high ionic conductivity, and a lithium secondary battery including the same.