Flame-Retardant Solid Polymer Electrolyte with Semi-IPN Conductivity
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Solution Overview
Problem
Current solid polymer electrolytes for lithium secondary batteries face challenges with low ion conductivity, mechanical strength, and a narrow operating voltage range, which limits their application in all solid-state batteries, and they lack flame-retardant characteristics.
Innovation Solution
A solid polymer electrolyte is developed by cross-linking multifunctional acrylate-based polymers with C1 to C10 polyalkylene oxides to form semi-interpenetrating polymer networks, blending with a flame-retardant polymer and lithium salt, and using a non-aqueous solvent, enhancing ion conductivity, mechanical strength, and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid polymer electrolyte is used to replace liquid electrolyte, then safety and stability are improved, but ion conductivity is reduced
Solution Approach 1:
The patent uses composite polymer electrolyte consisting of PEO matrix combined with LiClO4 salt and nanofiller particles. This composite structure maintains the safety advantages of solid polymer while the nanofiller creates additional ion conduction pathways that compensate for the low intrinsic conductivity of pure PEO, achieving both safety and adequate ion conductivity
2Stability of the object's composition
If PEO-based polymer electrolyte is used, then solid-state structure is achieved, but ion conductivity is very low due to high crystallinity
Solution Approach 1:
The patent introduces nanofiller particles at specific locations within the PEO matrix to create local amorphous regions with high ion conductivity. These nanofiller-rich zones serve as preferential ion transport pathways, allowing the bulk material to maintain solid crystalline structure while local regions provide efficient ion conduction
Solution Approach 2:
The patent modifies the crystallinity parameter of PEO by adding nanofillers that disrupt crystal formation. This changes the material from highly crystalline (low conductivity) to partially amorphous (high conductivity), while maintaining the solid polymer structure. The nanofiller concentration and size are optimized to achieve the desired balance between structural stability and ion conductivity
3Device complexity
If linear PEO-based polymer electrolyte is used, then simplicity is maintained, but mechanical strength is insufficient and processability is poor
Solution Approach 1:
The patent combines PEO with nanofiller particles to create a composite material that leverages the simplicity of PEO processing while the nanofiller network provides enhanced mechanical strength. The nanofillers act as reinforcing agents that improve tensile strength and dimensional stability without significantly complicating the manufacturing process
4Object-affected harmful factors
If solid polymer electrolyte with high solid content is used, then flame-retardant characteristics are achieved, but ion conductivity may be reduced
Solution Approach 1:
The patent incorporates porous nanofiller structures that create a network of micro-channels within the solid polymer matrix. These pores facilitate ion transport by providing continuous conduction pathways, while the high solid content and nanofiller material itself provide flame-retardant properties. The porous structure allows high ion conductivity despite the high solid content
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 improves ion conductivity, mechanical stability, and voltage stability, enabling effective application in all solid-state batteries while providing flame-retardant properties, thus ensuring safer and more reliable battery performance.
Implementation Method 1
cross-linking multifunctional acrylate-based polymers with C1 to C10 polyalkylene oxides to form semi-interpenetrating polymer networks
Implementation Method 2
Solid-type polymer electrolyte is a form in which dissociated lithium cations move in the polymer by adding lithium salt to a polymer containing hetero elements such as O, N, and S
Implementation Method 3
blending with a flame-retardant polymer and lithium salt, and using a non-aqueous solvent, enhancing ion conductivity, mechanical strength, and flame retardancy
Data Source
AI summary
A solid polymer electrolyte and a method for preparing the solid polymer electrolyte are disclosed. More particularly, a solid polymer electrolyte including a multifunctional acrylate-based polymer, a C1 to C10 polyalkylene oxide, a flame-retardant polymer, a lithium salt, and a non-aqueous solvent, wherein the multifunctional acrylate-based polymer is cross-linked with the polyalkylene oxide to form semi-interpenetrating polymer networks (semi-IPN), and the flame-retardant polymer is present blended with the semi-interpenetrating polymer networks of the multifunctional acrylate-based polymer and the polyalkylene oxide, which shows high solid content and flame-retardant characteristics, and a method for preparing the same.