Separator Coating Composition for Stable Battery Slurry Dispersion
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Solution Overview
Problem
Existing separators for electrochemical devices face issues with non-uniform distribution of components in the coating layer, leading to poor dispersibility and phase stability of the slurry, which affects the performance and safety of the device.
Innovation Solution
A separator with a coating layer containing a plate-shaped silicate-based composition, including SiO2, MgO, Li2O, or Na2O, along with polymer binder particles and inorganic particles, is used to improve uniformity and dispersibility, preventing phase separation and enhancing adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic substances are added to the coating layer to improve mechanical strength, then mechanical strength is improved, but the slurry viscosity decreases causing inorganic substances to precipitate and disperse poorly
Solution Approach 1:
A plate-shaped silicate-based composition is introduced as an intermediary substance between the polymer binder and inorganic particles. This silicate composition has a layered structure that can adsorb inorganic substances on its surface, preventing precipitation while maintaining slurry stability and uniform distribution during storage and coating processes.
2Stability of the object's composition
If the slurry viscosity is increased to prevent precipitation, then phase stability is improved, but the coating process becomes difficult and manufacturing complexity increases
Solution Approach 1:
The invention changes the chemical composition parameters of the slurry by incorporating a plate-shaped silicate-based composition with specific chemical formula ratios (SiO2: 50-80 wt%, Al2O3: 5-30 wt%, other oxides: 5-30 wt%). This compositional modification enables the slurry to maintain appropriate viscosity for coating while preventing inorganic substance precipitation through surface adsorption on the silicate layers.
3Strength
If a binder resin is added to improve adhesive strength between electrode and separator, then adhesive strength is improved, but the uniformity of coating layer decreases due to poor dispersibility
Solution Approach 1:
The plate-shaped silicate-based composition serves as a dispersing intermediary that prevents agglomeration of inorganic particles and binder resin in the slurry. Its layered structure provides steric hindrance and surface adsorption sites, ensuring uniform distribution of all components throughout the coating layer, which maintains both adhesive strength and coating uniformity.
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 solution results in a uniform coating layer that improves the performance and safety of electrochemical devices by ensuring consistent distribution of components and preventing electrical shorts, while maintaining mechanical strength and heat resistance.
Implementation Method 1
a plate-shaped silicate-based composition, which may improve dispersibility of a slurry for a coating layer and improve uniformity of the coating layer
Implementation Method 2
A separator with a coating layer containing a plate-shaped silicate-based composition, including SiO2, MgO, Li2O, or Na2O, along with polymer binder particles and inorganic particles, is used to improve uniformity and dispersibility, preventing phase separation
Data Source
Figure 1(a)~2
AI summary
The present disclosure relates to a separator for an electrochemical device and an electrochemical device including the same, and more particularly, to a separator for an electrochemical device including a plate-shaped silicate-based composition in a coating layer, thereby capable of improving dispersibility of a slurry for the coating layer and improving uniformity of the coating layer, and an electrochemical device including the same.