Ordered Polyblock Copolymer Synthesis for Uniform Battery Electrolytes
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Solution Overview
Problem
Existing methods for synthesizing block copolymers are complex, costly, and result in inconsistent block lengths and properties, limiting their application in high-performance batteries due to inefficient ion conduction and mechanical stability.
Innovation Solution
A sequential and convergent synthesis method using a Li organyl initiator with a pKa greater than or equal to 45 for nonpolar blocks and epoxy functionalization of polar blocks in a single step, eliminating the need for solvent exchange and toxic gases, allowing for highly reproducible and uniform block copolymers with defined structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sequential anionic polymerization methods are used to synthesize block copolymers, then polymer blocks can be formed, but the block lengths and properties are inconsistent and polydispersity is high
Solution Approach 1:
The patent changes the chemical parameters of the polymerization system by using organolithium compounds with pKa ≥ 45 as initiators, which fundamentally alters the polymerization kinetics and mechanism. This parameter change enables precise control over block length and narrows polydispersity, directly resolving the contradiction between manufacturing precision and property consistency
Solution Approach 2:
The patent performs preliminary functionalization of polar monomers with epoxy groups before polymerization. This preliminary action ensures that the polar blocks are formed with uniform structure and controlled molecular weight, preventing inconsistencies during the polymerization process and achieving reliable property consistency
2Adaptability or versatility
If complex multi-step synthesis procedures are used to produce block copolymers, then various block structures can be achieved, but the synthesis process becomes costly and time-consuming
Solution Approach 1:
The patent merges the synthesis of polar blocks and nonpolar blocks into a single sequential polymerization process. By using compatible initiators and conditions for both block types, the method eliminates intermediate purification and solvent exchange steps, significantly improving productivity while maintaining block structure diversity
Solution Approach 2:
The patent employs a universal organolithium initiator system with pKa ≥ 45 that can initiate polymerization of both polar and nonpolar monomers. This multi-functional initiator system allows versatile block copolymer synthesis through a unified procedure, reducing process complexity and cost while maintaining adaptability to different block structures
3Manufacturing precision
If solvent exchange and purification steps are included in the synthesis process, then product purity can be improved, but the process complexity and cost increase
Solution Approach 1:
The patent conducts the entire polymerization process in an inert atmosphere using dry, oxygen-free conditions. This inert environment prevents side reactions and maintains product purity without requiring complex solvent exchange or purification steps, as the reaction mixture remains stable throughout the process
Solution Approach 2:
The polymerization system is designed to be self-purifying through the inherent stability of the organolithium-mediated reaction. The controlled polymerization conditions and inert atmosphere ensure that no extraneous contaminants are introduced, and the product precipitates cleanly, eliminating the need for additional purification equipment and procedures
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 method produces block copolymers with narrow polydispersity and uniform chain lengths, enabling fast lithium ion conduction and improved mechanical stability, suitable for high-performance batteries with enhanced conductivity across a wide temperature range.
Implementation Method 1
the nonpolar block is constructed from specific monomers via a living sequential anionic polymerization using a Li organyl initiator with a pKa value greater than or equal to 45
Implementation Method 2
the polar polymer block is synthesized in one step via an epoxy functionalization of one of the monomers of the polar block, obtained by a reaction of this monomer with epichlorohydrin
Implementation Method 3
Through the interaction of the polymer segments of the individual block polymers, they undergo self-assembly, forming an ordered network of ion-conducting domains in which consistently decoupled, fast lithium-ion conduction with a simultaneously high transfer number is present
Data Source
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AI summary
The present invention relates to a method for sequential and convergent production of ordered block copolymers which at least comprise a non-polar and a polar polymer block, wherein the non-polar block is constructed by means of living sequential anionic polymerisation from specific monomers using a Li organyl initiator having a pKa value greater than or equal to 45, and the polar block is a polymer block having a molecular weight greater than or equal to 350 g/mol and less than or equal to 5000 g/mol and is selected from monomers from the group consisting of C2-C10 oxacyclo- compounds, derivatives thereof or mixtures of at least two different monomers therefrom, wherein the polar polymer block is convergently covalently bonded in one step to the non-polar block anion by means of epoxy functionalisation of one of the monomers of the polar block, obtained by reacting this monomer with epichlorohydrin, in a non-polar solvent in the presence of free Li ions. The present invention also relates to specific block copolymers having short polar chains of very uniform chain lengths, to polymer electrolytes and to the use of the block copolymers as polymer electrolytes in secondary alkaline batteries.