Crosslinked Solid Electrolyte Composition for Stable Li-Ion Conduction
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Solution Overview
Problem
Current solid polymer electrolytes for lithium secondary batteries face challenges with low ion conductivity at room temperature and electrochemical stability due to high crystallinity, limiting their application in lithium secondary batteries.
Innovation Solution
A solid electrolyte composition is developed by grafting a monomer with an alkylene oxide group and a crosslinkable functional group onto a fluorine-based polymer, which is then thermally cured to form a crosslinked structure, enhancing ion conductivity and electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid polymer electrolyte is used to improve stability, then electrochemical stability is improved, but ion conductivity at room temperature decreases significantly
Solution Approach 1:
The invention uses a composite structure combining PEO (polyethylene oxide) with a crosslinkable monomer containing an alkylene oxide group and crosslinkable functional group. This composite approach allows the electrolyte to maintain the electrochemical stability of solid polymers while achieving higher ion conductivity through the synergistic effects of PEO's lithium ion coordination ability and the crosslinked network's enhanced chain fluidity
Solution Approach 2:
The invention changes the physical and chemical parameters of the polymer electrolyte by introducing a crosslinked structure through thermal curing of the crosslinkable functional groups. This crosslinking process transforms the linear PEO chains into a three-dimensional network, which reduces crystallinity and increases chain mobility, thereby significantly improving ion conductivity at room temperature
2Quantity of substance
If polyethylene oxide is used as solid polymer electrolyte to conduct lithium ions, then lithium ion conduction ability is improved, but crystallinity increases causing low conductivity at room temperature
Solution Approach 1:
The invention changes the structural parameters of PEO by grafting a crosslinkable monomer containing an alkylene oxide group onto the PEO chains. The resulting crosslinked structure reduces the crystallinity of PEO while maintaining its lithium ion conduction ability, enabling high ion conductivity at room temperature
Solution Approach 2:
The invention creates a composite material system where PEO is combined with a crosslinkable monomer containing both alkylene oxide groups and crosslinkable functional groups. This composite structure allows the PEO to maintain its lithium ion conduction capability while the crosslinked network reduces crystallinity and enhances chain fluidity
3Reliability
If a monomer with alkylene oxide group and crosslinkable functional group is grafted on fluorine-based polymer, then ion conductivity and electrochemical stability are enhanced, but device complexity increases
Solution Approach 1:
The invention applies local quality by incorporating specific functional groups (alkylene oxide groups and crosslinkable functional groups) at specific locations on the polymer chain. The alkylene oxide groups are positioned to coordinate with lithium ions for enhanced conduction, while the crosslinkable functional groups are positioned to form the crosslinked network, creating localized functional regions that improve performance without requiring complete structural redesign
Solution Approach 2:
The crosslinkable monomer serves multiple functions: the alkylene oxide groups provide lithium ion coordination and conduction pathways, while the crosslinkable functional groups form the three-dimensional crosslinked network. This multi-functionality allows a single monomer structure to address both ion conductivity and structural stability requirements
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 approach significantly improves ion conductivity and electrochemical stability of the electrolyte, making it suitable for lithium secondary batteries by reducing crystallinity and maintaining mechanical strength.
Implementation Method 1
a monomer comprising an alkylene oxide group and a crosslinkable functional group is grafted on a fluorine-based polymer
Implementation Method 2
A solid electrolyte for a secondary battery formed by thermally curing the composition
Implementation Method 3
enhancing ion conductivity and electrochemical stability of the electrolyte are enhanced, and have completed the present invention
Data Source
AI summary
The present invention relates to a solid electrolyte composition for a lithium secondary battery in which a monomer comprising alkylene oxide group and a crosslinkable functional group is grafted on a fluorine-based polymer, and a solid electrolyte for a secondary battery formed by thermally curing the composition. By graft copolymerizing a monomer comprising alkylene oxide group and a crosslinkable functional group on a fluorine-based polymer having high lithium ion conductivity, the solid electrolyte of the present invention is capable of providing a solid electrolyte for a secondary battery having significantly enhanced solid electrolyte ion conductivity and electrochemical stability.