Binder composition for secondary battery electrode, conductive material paste composition for secondary battery electrode, slurry composition for secondary battery electrode, electrode for secondary battery, and secondary battery
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Solution Overview
Problem
Conventional binder compositions for secondary battery electrodes face challenges in achieving high dispersibility of conductive materials and dispersion stability at high temperatures, leading to increased internal resistance in secondary batteries.
Innovation Solution
A binder composition containing a polymer with a nitrile group-containing monomer unit, an aromatic vinyl monomer unit, and a linear alkylene structural unit, with a residual mercaptan content between 1 ppm and 50 ppm, is used to enhance dispersibility and stability, reducing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binder composition is used, then electrode structure is maintained, but dispersibility of conductive material is insufficient and dispersion stability at high temperatures deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the binder polymer by incorporating specific monomer units (nitrile group-containing, aromatic vinyl, and linear alkylene structural units) and controlling residual mercaptan content within 1-50 ppm. This compositional modification enables the binder to achieve both high dispersibility of conductive materials and stable dispersion at high temperatures, resolving the contradiction between these two properties.
2Reliability
If conventional binder composition is used, then manufacturing process is simple, but internal resistance of secondary battery increases
Solution Approach 1:
The patent modifies the binder composition by specifying precise chemical parameters: a polymer containing nitrile group-containing monomer units, aromatic vinyl monomer units, and linear alkylene structural units, with residual mercaptan content controlled at 1-50 ppm. This parameter optimization improves electrical conductivity (reduces internal resistance) while maintaining manufacturing feasibility through established polymerization and purification processes.
3Stability of the object's composition
If residual mercaptan content is increased to improve dispersibility, then dispersion stability at high temperatures decreases
Solution Approach 1:
The patent identifies and optimizes the residual mercaptan content parameter within a specific range of 1-50 ppm. This controlled parameter range achieves the optimal balance between dispersibility (sufficiently high due to mercaptan's surfactant-like properties) and dispersion stability at high temperatures (maintained by limiting excessive mercaptan that would cause degradation). This precise parameter control resolves the contradiction between these opposing requirements.
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 effectively increases dispersibility and stability of conductive materials, resulting in reduced internal resistance and improved performance of secondary batteries.
Implementation Method 1
it is possible to produce a conductive material paste having sufficiently high dispersibility of a conductive material
Implementation Method 2
dispersion stability at high temperatures
Data Source
AI summary
A binder composition for a secondary battery electrode contains a polymer that includes a nitrile group-containing monomer unit, an aromatic vinyl monomer unit, and a linear alkylene structural unit and that has a residual mercaptan content, by mass, of not less than 1 ppm and not more than 50 ppm.