Amorphous Polymer Electrolyte Doping for High-Conductivity Li Batteries
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Solution Overview
Problem
Current polymer electrolytes for lithium secondary batteries have low ionic conductivity and mechanical strength, limiting their suitability for commercialization due to semi-crystalline structures that hinder ion movement and degrade energy characteristics.
Innovation Solution
A polymer electrolyte comprising a specific polymer structure represented by Formula 1 or Formula 2, combined with an electron-acceptor having at least one double bond, and optionally a lithium salt, forming a free-standing solid or hybrid polymer electrolyte with improved mechanical properties and ionic conductivity, enhancing battery safety and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene oxide is used as polymer electrolyte, then ion dissociation ability is improved, but ionic conductivity deteriorates due to semi-crystalline structure
Solution Approach 1:
The patent changes the physical state parameter of the polymer electrolyte from semi-crystalline to amorphous by controlling the polymer structure and composition. This parameter change eliminates the crystal structure that hinders ion movement while maintaining the polymer's ion dissociation ability, thereby improving ionic conductivity without sacrificing reliability
Solution Approach 2:
The patent creates a composite polymer electrolyte system combining polyethylene oxide with specific additives and fillers that prevent crystallization. This composite approach maintains the excellent ion dissociation properties of PEO while introducing components that disrupt crystal formation, resulting in improved ionic conductivity through the amorphous phase
2Reliability
If solid polymer electrolyte is used, then battery safety is improved, but ionic conductivity deteriorates compared to liquid electrolyte
Solution Approach 1:
The patent changes the structural parameter of the solid polymer electrolyte from crystalline to amorphous, which fundamentally alters the ion transport mechanism. The amorphous structure provides continuous pathways for ion conduction while maintaining the solid-state safety advantages, bridging the performance gap between solid and liquid electrolytes
Solution Approach 2:
The patent utilizes the phase transition concept by designing a polymer electrolyte that operates in an amorphous phase at operating temperatures. This phase state optimization enables high ionic conductivity typically associated with liquids while maintaining the solid-state safety profile, effectively decoupling safety from conductivity performance
3Volume of moving object
If thin-film battery design is implemented, then miniaturization is achieved, but mechanical strength deteriorates
Solution Approach 1:
The patent employs advanced thin-film technology by creating a uniformly thin polymer electrolyte layer with controlled amorphous structure. This thin-film design achieves miniaturization while the amorphous polymer matrix provides enhanced mechanical integrity and flexibility, preventing brittleness that would normally accompany reduced thickness
Solution Approach 2:
The patent uses composite polymer electrolyte materials that combine structural reinforcement with ion-conductive phases. This composite approach enables the thin-film design to maintain adequate mechanical strength while achieving the desired miniaturization, as the composite structure provides both structural support and ionic 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 polymer electrolyte achieves enhanced electrical and ionic conductivity, mechanical strength, and electrochemical stability at high voltage and temperature, enabling safer and more efficient lithium secondary battery operation.
Implementation Method 1
an electron-acceptor having at least one double bond, as a dopant
Implementation Method 2
cations of the alkali metal salt are stabilized while the cations are coordinated with oxygen atoms present in the polyethylene oxide to form a complex
Implementation Method 3
polymer electrolyte for a secondary battery having excellent mechanical strength and improved electrical conductivity and ionic conductivity
Data Source
AI summary
The present invention relates to a polymeric electrolyte for a secondary battery and a lithium secondary battery comprising the same. More specifically, the present invention relates to a polymeric electrolyte for a secondary battery, which comprises a polymer and an electron acceptor having at least one double bond as a dopant, such that mechanical properties, ionic conductivity, and electrical conductivity are improved; and a lithium secondary battery comprising the same, which has enhanced electrochemical stability under high temperature and high voltage.