Conductive Primer Composition for Battery Current Collectors
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Solution Overview
Problem
Electrical energy storage devices with non-aqueous electrolytes face issues such as corrosion of metal current collectors and unsatisfactory adhesion of active coatings due to poor conductivity and reactivity of commercial conductive primer coatings, leading to reduced efficiency and lifespan.
Innovation Solution
A conductive primer composition comprising an organic polymeric binder with water-soluble polymers and phosphorus-based acid groups, combined with conductive particles, which forms a stable and adherent coating that maintains low electrical resistance and resistance to non-aqueous electrolytes, improving adhesion and electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If commercial conductive primer coatings are applied to current collectors, then adhesion of active coating is improved, but electrical conductivity of the coated current collector is reduced
Solution Approach 1:
The patent modifies the chemical composition parameters of the primer coating by incorporating specific conductive materials and optimizing their ratios to achieve both adhesion and conductivity requirements
Solution Approach 2:
The patent uses composite primer coatings combining multiple materials (e.g., conductive polymers, metal particles, binders) to simultaneously provide adhesion functionality and electrical conductivity, resolving the contradiction between these two properties
2Reliability
If metal current collectors are used, then electrical conductivity is improved, but corrosion by electrolyte occurs
Solution Approach 1:
The patent introduces primer coatings as intermediary layers between the metal current collector and the electrolyte, protecting the metal from direct contact and corrosion while maintaining electrical conductivity through the primer's conductive properties
Solution Approach 2:
The patent creates a chemically inert protective environment by applying corrosion-resistant primer coatings that prevent electrolyte attack on the metal current collector, effectively isolating the reactive metal from the corrosive electrolyte environment
3Strength
If primer coating is applied to improve adhesion, then adhesion of active coating is improved, but electrolyte attack on primer and current collector occurs
Solution Approach 1:
The patent designs the primer coating as a protective intermediary layer with enhanced chemical resistance that shields both the active coating and current collector from electrolyte attack while maintaining adhesion functionality
Solution Approach 2:
The patent modifies the chemical composition and cross-linking density of the primer coating to enhance its resistance to electrolyte penetration and chemical degradation, while preserving its adhesion properties
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 composition enhances the adhesion and stability of the conductive coating on current collectors, reducing electrolyte attack and electrical resistance, thereby improving the performance and lifespan of electrical energy storage devices.
Implementation Method 1
improved adhesion of the resultant conductive coating as deposited on a current collector
Implementation Method 2
lowered, or at least not increased, electrical resistance of the conductive coating / current collector combination
Implementation Method 3
improved resistance of the resultant dried primer or active coating to non-aqueous electrolyte
Data Source
AI summary
A conductive coating composition for use in electrical energy storage devices, which contain a non-aqueous electrolyte, is provided comprising an organic polymeric binder comprising one or more water-soluble polymers; water; solid conductive particles dispersed in the binder; and phosphorus based acid bound to at least one of the water-soluble polymers and present in a range of 0.025-10.0% by weight of the water-soluble polymers, as well as methods of making and using said conductive coating composition, coated current collectors and electrical energy storage devices made therefrom.