Polymer Electrolyte Monomer for Flame-Retardant Li Battery Conduction
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Solution Overview
Problem
Existing lithium secondary batteries using gel polymer or composite polymer electrolytes face issues with ignition stability and require improved flame retardancy and ionic conductivity.
Innovation Solution
A monomer for an electrolyte comprising specific alkylene and oxyalkylene groups, combined with a phosphorus compound, is used to form a polymer that enhances flame retardancy and ionic conductivity, integrated with a lithium salt and inorganic electrolyte to create a composite electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel polymer electrolytes or composite polymer electrolytes are used in lithium secondary batteries, then the batteries can be solidified to enhance stability against ignition and explosion, but the flame retardancy is insufficient compared to oxide- or sulfide-based electrolytes
Solution Approach 1:
The patent uses composite polymer electrolytes combining polyethylene oxide (PEO) with inorganic fillers (alumina, silica, or titania particles) to create a material that maintains the solidified stable structure while incorporating flame-retardant inorganic components. This composite approach allows simultaneous achievement of structural stability and improved flame retardancy
Solution Approach 2:
The patent introduces specific functional groups (phosphorus-containing groups, nitrogen-containing groups, or fluorine-containing groups) at local positions within the polymer electrolyte structure. These localized functional groups provide flame retardancy without compromising the overall solidified structure, allowing different regions of the material to serve different functions
2Reliability
If solid-state electrolytes are used to enhance stability, then safety against ignition and explosion is improved, but ionic conductivity may be reduced
Solution Approach 1:
The patent incorporates inorganic filler particles (alumina, silica, or titania) that create porous structures within the polymer electrolyte matrix. These pores facilitate ion transport pathways while the solid polymer matrix maintains structural stability, thus balancing ionic conductivity with stability
Solution Approach 2:
The patent modifies the polymer electrolyte composition by adding specific additives and changing the molecular structure (introducing flexible spacers, adjusting crosslinking density) to optimize the balance between stability and ionic conductivity. The inorganic fillers also serve to enhance ionic conductivity through their surface effects and created 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 electrolyte exhibits improved stability, ionic conductivity, and electrochemical characteristics, enhancing safety and performance of lithium secondary batteries.
Implementation Method 1
a first monomer represented by Formula 1; and a second monomer represented by Formula 2
Implementation Method 2
electrolyte for secondary battery including same... improving flame retardancy and ionic conductivity
Data Source
Figure 1~3
Figure 4
AI summary
A monomer for an electrolyte according to embodiments of the present disclosure may include a first monomer represented by Formula 1 and a second monomer represented by Formula 2. A lithium secondary battery according to embodiments of the present disclosure may include a cathode, an anode, and an electrolyte layer, wherein the electrolyte layer may include a polymer derived from a compound represented by Formula 1.