Water-Based Cathode Coating With Interfacing Layer Adhesion
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Solution Overview
Problem
Existing electrochemical accumulator manufacturing methods using organic solvents are costly, require complex recycling, and pose flammability and explosion risks due to high vaporization temperatures, necessitating safer and more cost-effective alternatives.
Innovation Solution
A cathode composition for electrochemical accumulators using a water-based first composition with a pH greater than or equal to 10, comprising lithium-nickel-cobalt-manganese oxides, a water-soluble binder, and conductive additives, deposited on an interfacing layer with a second composition enhancing adhesion and conductivity, facilitating large-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic solvents (NMP) are used as base for cathode composition, then good visco-mechanical properties and high coating speed are achieved, but manufacturing cost increases, complex recycling is required, and flammability/explosion risks arise
Solution Approach 1:
The patent changes the fundamental parameter of the solvent base from organic (NMP) to aqueous (water-based). This substitution eliminates the need for complex recycling infrastructure and safety protection measures while maintaining coating processability through careful selection of water-soluble binders and additives that preserve visco-mechanical properties suitable for industrial coating operations
Solution Approach 2:
The patent adopts a water-based composition that can be easily disposed of or evaporated without requiring complex recycling systems. Water naturally evaporates at low temperatures and does not require specialized recycling infrastructure, effectively replacing the expensive and complex organic solvent recycling system
2Ease of manufacture
If organic solvents (NMP) are used as base for cathode composition, then good visco-mechanical properties are achieved, but manufacturing cost increases due to solvent elimination temperature and recycling requirements
Solution Approach 1:
The patent changes the solvent base from organic to aqueous, fundamentally altering the manufacturing process. Water-based compositions eliminate the need for high-temperature elimination and complex recycling systems, while the selection of appropriate water-soluble binders maintains the necessary visco-mechanical properties for effective coating operations
Solution Approach 2:
The patent employs a water-based composition that can be simply evaporated or disposed of without requiring complex recycling infrastructure. Water's natural properties allow for easy removal through low-temperature evaporation, eliminating the expensive recycling systems required for organic solvents
3Productivity
If organic solvents (NMP) are used as base for cathode composition, then coating can be performed at industrial scale, but safety risks of flammability and explosion increase due to high vaporization temperature
Solution Approach 1:
The patent changes the solvent base from organic (flammable) to aqueous (non-flammable). This fundamental parameter change eliminates fire and explosion hazards while maintaining industrial-scale coating capability through careful formulation of water-soluble binders and additives that preserve the composition's coating performance characteristics
Solution Approach 2:
The patent converts the potential harm of organic solvent flammability into a benefit by using water as the base. Water's high specific heat capacity and non-flammability provide inherent safety during industrial coating operations, while the formulation maintains adequate viscosity and coating properties through selection of appropriate water-soluble polymers and additives
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 water-based cathode composition reduces manufacturing costs, simplifies recycling, minimizes flammability risks, and improves electrochemical performance by enhancing adhesion and conductivity, making it suitable for large-scale production.
Implementation Method 1
The operating principle of such accumulators is based on the reversible storage of electrical energy into chemical energy by using two separate and coupled electrochemical reactions. The positive and negative electrodes bathe in the electrolyte and are the seat of electrochemical reactions, called faradic reactions.
Implementation Method 2
a binder that makes it possible to ensure the cohesion of the particles and the adhesion of the substrate
Implementation Method 3
conductive particles ensuring a good transport of the electrons to the set of active materials
Implementation Method 4
The two positive and negative electrodes are ionically linked by an electrolyte that can be liquid, in gel form or solid. During the discharge, the active material at the negative electrode oxidizes and releases part of the electrons that are conveyed by means of the current collector toward the outer circuit and on the other hand cations that migrate through the electrolyte toward the positive electrode.
Data Source
AI summary
The invention relates to a cathode for an electrochemical accumulator including a current collector, an interfacing layer, the interfacing layer being coated on the current collector, and an electrode, the electrode being formed by deposition, in particular by coating, of a first composition on the interfacing layer, the first composition having a hydrogen potential greater than or equal to 10, preferably greater than or equal to 12, the hydrogen potential being measured at a temperature of 25° C.