Electrode Binder Composition for Internal Heat Resistance
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Solution Overview
Problem
Conventional techniques for forming an inorganic particle layer on electrodes in electrochemical devices only provide thermal protection to the surface portion, leaving the active material layer inside unprotected, which can lead to deterioration and inadequate heat resistance.
Innovation Solution
A binder comprising a re-emulsifiable resin powder coated with inorganic particles and a metal-crosslinking thickening agent, which forms a hydrophobic gel in an aqueous system, uniformly disperses inorganic particles across the electrode active material, creating a protective layer that enhances heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an inorganic particle layer is formed by applying slurry to the surface of an electrode, then the separator facing the electrode is protected, but the internal active material layer is not thermally protected and deteriorates
Solution Approach 1:
The invention applies a dual-layer structure where a first inorganic particle layer is formed on the electrode surface and a second inorganic particle layer is formed inside the active material layer. This nested configuration allows the external layer to protect the separator while the internal layer provides thermal protection to the active material, resolving the contradiction between surface protection and internal heat resistance.
2Temperature
If a porous inorganic particle layer is formed on the electrode surface, then heat resistance is improved, but the active material layer inside remains unprotected and deteriorates
Solution Approach 1:
The patent implements a nested structure with an first inorganic particle layer on the surface and a second inorganic particle layer embedded within the active material. This allows the external porous layer to provide heat resistance while the internal layer stabilizes the active material composition, simultaneously achieving both heat resistance and compositional stability.
3Ease of manufacture
If conventional slurry coating method is used to form inorganic particle layer, then surface protection is provided, but internal active material lacks thermal protection leading to deterioration
Solution Approach 1:
The patent extends the conventional slurry coating method by incorporating inorganic particles within the active material layer during the slurry preparation stage, in addition to forming a surface layer. This nested approach maintains the simplicity of the coating process while ensuring both surface and internal thermal protection of the active material.
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 binder effectively improves the heat resistance of electrodes by uniformly protecting both the surface and internal active material layers, enhancing storage and cycle characteristics, especially in high-temperature conditions.
Implementation Method 1
a metal-crosslinking thickening agent forming a hydrophobic gel by being crosslinked, in an aqueous system, via metal ions derived from an electrode active material
Implementation Method 2
forming a hydrophobic gel by being crosslinked
Implementation Method 3
a re-emulsifiable resin powder coated with inorganic particles
Implementation Method 4
the inorganic particles are resistant to heat
Data Source
AI summary
An aspect of the present invention provides a binder which makes it possible to obtain an electrode excellent in heat resistance. The binder contains: a re-emulsifiable resin powder coated with inorganic particles; and a metal-crosslinking thickening agent forming a hydrophobic gel by being crosslinked, in an aqueous system, via metal ions derived from an electrode active material.