Binder Composition for Non-Aqueous Battery Electrode Slurry
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Solution Overview
Problem
Conventional binder compositions for non-aqueous secondary battery electrodes face challenges in achieving excellent viscosity stability and cycle characteristics, particularly in maintaining stability over time and preventing electrolyte solution resistance and internal resistance issues.
Innovation Solution
A binder composition comprising a polymer with a monomer unit bondable to a cationic group and a (meth)acrylic acid ester monomer unit, combined with an organic compound having at least two cationic groups, which maintains a viscosity change rate of 400% or less at 60°C for 30 days, enhancing the slurry composition's viscosity stability and the battery's cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional binder composition is used, then the electrode mixed material layer can be formed, but the viscosity stability of the slurry composition deteriorates over time
Solution Approach 1:
The patent changes the chemical parameters of the binder composition by introducing a polymer with specific functional groups (carboxyl, hydroxyl, or phosphate groups) that can form strong interactions with the cationic groups in the electrolyte solution. This chemical parameter change enables the binder to maintain viscosity stability over time by preventing degradation through these strong interactions.
Solution Approach 2:
The patent creates a composite binder system combining a polymer with specific functional groups and an organic compound with cationic groups. This composite material approach allows the functional groups to work synergistically with the cationic groups, forming a stable network structure that maintains viscosity stability over extended periods.
2Reliability
If a conventional binder composition is used, then the electrode can be manufactured, but the cycle characteristics of the battery deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the binder to include polymers with carboxyl, hydroxyl, or phosphate groups. These parameter changes enhance the binder's ability to form stable interactions with electrode materials and electrolyte solution, thereby improving cycle characteristics and extending battery life through repeated charge-discharge cycles.
Solution Approach 2:
The patent replaces conventional short-lived binder materials with a specially designed polymer-based binder system that maintains its binding function over extended periods. This substitution transforms a short-lived component into a durable one, enabling the battery to withstand numerous cycles while maintaining performance.
3Reliability
If a conventional binder composition is used, then the slurry can be applied, but the electrolyte solution resistance increases
Solution Approach 1:
The patent changes the chemical parameters of the binder composition by incorporating polymers with specific functional groups that have high affinity for the electrolyte solution. This parameter change reduces electrolyte solution resistance by enhancing the wettability and interaction between the binder and electrolyte, thereby improving ionic conductivity.
4Reliability
If a conventional binder composition is used, then the electrode mixed material layer can be formed, but the internal resistance of the battery increases
Solution Approach 1:
The patent employs a composite binder system where the polymer with functional groups works synergistically with the organic compound containing cationic groups. This composite structure creates a stable interface between the electrode active material and the electrolyte solution, reducing internal resistance by facilitating efficient charge transfer and minimizing interfacial barriers.
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 proposed binder composition significantly improves the viscosity stability and cycle characteristics of non-aqueous secondary battery electrodes, reducing electrolyte solution resistance and internal resistance, while maintaining stability over extended periods.
Implementation Method 1
a polymer that includes a monomer unit including a functional group that is bondable with a cationic group
Data Source
AI summary
Provided is a binder composition for a non-aqueous secondary battery electrode that can form a slurry composition for a non-aqueous secondary battery electrode having excellent viscosity stability and a non-aqueous secondary battery having excellent cycle characteristics. The binder composition for a non-aqueous secondary battery electrode contains: a polymer that includes a monomer unit including a functional group that is bondable with a cationic group and a (meth)acrylic acid ester monomer unit; and an organic compound that includes at least two cationic groups. The binder composition for a non-aqueous secondary battery electrode has a viscosity change rate of 400% or less when left at rest at a temperature of 60° C. for 30 days.