Semi-IPN Solid Polymer Electrolyte for Conductive Flame-Retardant Batteries
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Solution Overview
Problem
Existing solid polymer electrolytes for lithium secondary batteries suffer from low ion conductivity, poor mechanical strength, narrow operating voltage range, and lack of flame-retardant characteristics, making them unsuitable for all-solid-state batteries.
Innovation Solution
A solid polymer electrolyte comprising multifunctional acrylate-based polymers cross-linked with C1 to C10 polyalkylene oxides to form semi-interpenetrating polymer networks (semi-IPN), blended with a flame-retardant polymer and a non-aqueous solvent, such as dimethyl sulfone or sulforane, to enhance ion conductivity, mechanical stability, and flame-retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If solid polymer electrolyte is used to replace liquid electrolyte, then leakage stability is improved, but ion conductivity deteriorates
Solution Approach 1:
The composite structure of polymer matrix with dispersed polyalkylene oxide phases maintains the leakage stability of solid polymers while introducing ion-conductive regions that compensate for the low ion conductivity, thus resolving the contradiction between leakage stability and ion conductivity.
Solution Approach 2:
The patent changes the physical and chemical parameters of the electrolyte system by incorporating polyalkylene oxide with specific molecular weights and concentrations into the polymer matrix. This parameter modification enables the system to maintain both leakage stability and adequate ion conductivity simultaneously.
2Ease of manufacture
If conventional solid polymer electrolyte materials are used, then manufacturing simplicity is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent creates a composite electrolyte system where polyalkylene oxide phases are distributed within a polymer matrix. This composite structure enhances mechanical strength through phase reinforcement while maintaining manufacturing simplicity by using a straightforward mixing and processing approach.
3Ease of manufacture
If conventional solid polymer electrolyte materials are used, then manufacturing simplicity is improved, but operating voltage range deteriorates
Solution Approach 1:
The composite structure of polymer matrix with polyalkylene oxide phases creates an electrolyte system with enhanced electrochemical stability and wider operating voltage range, while the manufacturing process remains simple through direct mixing and formation of the composite structure.
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 ion conductivity, mechanical strength, and voltage stability, with a high solid content, effectively preventing fires and ensuring stable battery operation.
Implementation Method 1
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 2
photo-polymerizing the electrolyte composition to obtain the solid polymer electrolyte
Data Source
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AI summary
The present invention relates to a solid polymer electrolyte and a method for preparing the solid polymer electrolyte, more particularly, to a solid polymer electrolyte comprising 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 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.