Crosslinked Acrylic Copolymer for Stable Secondary Cell Electrodes
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Solution Overview
Problem
The existing crosslinked poly(meth)acrylic acid nitroxide compounds used in secondary cells have stability issues with solvents, leading to poor processability and reduced capacity due to cracking when applied to current collectors, requiring excessive solvent amounts and potentially lowering the electrode's performance.
Innovation Solution
A crosslinked (meth)acrylic acid-type copolymer is developed through the polymerization of (meth)acrylic acid imino compounds and (meth)acrylic acid esters in the presence of a crosslinking agent, followed by nitroxidation, which improves solvent stability and prevents cracking during drying, allowing for a high coating property with reduced solvent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a crosslinked poly(meth)acrylic acid nitroxide compound is used to improve solvent stability, then stability to solvent is improved, but cracks occur on the composition-applied surface after drying and processability becomes poor
Solution Approach 1:
The invention changes the chemical composition parameters by introducing specific functional groups (carboxyl groups from (meth)acrylic acid and ester groups from (meth)acrylic acid esters) into the polymer structure. This compositional modification allows the polymer to maintain crosslinked solvent stability while improving coating properties and preventing cracks during drying, thus resolving the contradiction between solvent stability and processability
Solution Approach 2:
The invention creates a composite polymer structure by copolymerizing (meth)acrylic acid imino compounds with (meth)acrylic acid esters in the presence of crosslinking agents. This composite material combines the solvent stability of crosslinked structures with the coating benefits of ester groups, achieving both improved solvent resistance and enhanced processability without cracking
2Stability of the object's composition
If a crosslinked poly(meth)acrylic acid nitroxide compound is used to improve solvent stability, then stability to solvent is improved, but the amount of solvent required increases and capacity may be lowered
Solution Approach 1:
The invention modifies the polymer's chemical parameters by incorporating ester functional groups that enhance coating properties. This allows the formation of stable coatings with reduced solvent content, eliminating the need to use excessively large amounts of solvent while maintaining excellent solvent stability of the crosslinked structure
3Reliability
If conventional radical compounds are used to increase capacity, then capacity is improved, but stability to solvent is insufficient and the electrode active material is dissolved
Solution Approach 1:
The invention develops a composite polymer material that integrates radical-containing (meth)acrylic acid imino compounds with crosslinking agents and ester groups. This composite structure provides both the high capacity needed for energy storage and excellent solvent stability, preventing dissolution of the electrode active material while maintaining high capacity performance
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 new copolymer exhibits excellent solvent stability and prevents cracking, enhancing the production processability and capacity of secondary cells while maintaining stability over time, making it suitable for high-energy-density applications like lithium ion secondary cells.
Implementation Method 1
polymerization of a (meth)acrylic acid imino compound represented by the general formula (I) and a (meth)acrylic acid ester in the presence of a crosslinking agent
Implementation Method 2
nitroxidation
Data Source
AI summary
It is an object of the present invention to provide a crosslinked (meth)acrylic acid-type copolymer excellent in stability to a solvent, which causes substantially no crack due to drying when applied onto the surface of a current collector, and a secondary-cell electrode using the copolymer.The present invention relates to a crosslinked (meth)acrylic acid-type copolymer obtained by the steps of: polymerization of a (meth)acrylic acid imino compound represented by the general formula (1):(in the formula (1), R represents a hydrogen atom or a methyl group) and a (meth)acrylic acid ester in the presence of a crosslinking agent, and nitroxidation.