Solvent-Free Electrostatic Coating for Battery Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for coating substrates in lithium secondary batteries require solvents, leading to increased costs, handling and storage burdens, and reduced product yield due to drying procedures.
Innovation Solution
A method involving charging inorganic particles to form a coating layer on a substrate without solvents, using heat and pressure to fix the layer, and optionally incorporating surface-modifying compounds or polymer binders for enhanced adhesion and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional slurry coating method with solvent is used, then proper dispersion of active materials and inorganic particles is achieved, but purchase costs and handling/storage costs increase, and product yield decreases due to drying procedure
Solution Approach 1:
The invention extracts and removes the solvent component from the conventional slurry coating process. By using a solvent-free dry coating method with electrostatic charging, the harmful solvent is completely eliminated from the system, thereby eliminating purchase costs, handling/storage costs, and the need for drying procedures that reduce product yield.
Solution Approach 2:
The invention replaces the chemical-based slurry coating mechanism with an electrostatic-based dry coating mechanism. Instead of using solvent to carry particles, the system uses electrostatic charging to attract and deposit charged inorganic particles onto the substrate, substituting a mechanical/electrical field-based approach for the chemical solvent-based approach.
2Ease of manufacture
If conventional slurry coating method with solvent is used, then flexibility and proper dispersion are achieved, but additional costs for handling and storing harmful solvents incur
Solution Approach 1:
The invention extracts and removes the harmful solvent component from the coating process. By implementing a solvent-free dry coating method using electrostatic charging, the system eliminates the source of harmful factors while maintaining the ability to achieve proper coating flexibility through controlled particle deposition.
Solution Approach 2:
The invention converts the potential harm of solvent use into a benefit by completely eliminating solvent from the process. The electrostatic charging mechanism not only removes the harmful solvent but also provides precise control over particle deposition, improving coating quality while eliminating environmental and safety concerns associated with solvent handling.
3Reliability
If drying procedure is performed after slurry coating, then coating fixation is achieved, but product yield is reduced
Solution Approach 1:
The invention replaces the thermal drying fixation mechanism with an electrostatic adhesion mechanism. Instead of using heat to evaporate solvent and fix the coating, the system uses electrostatic charging to attract and hold particles onto the substrate, eliminating the need for drying procedures that cause product yield reduction through evaporation losses and energy consumption.
Solution Approach 2:
The invention avoids the phase transition process (evaporation of solvent during drying) by using electrostatic adhesion to directly fix particles in their solid state. This eliminates the need for thermal energy input and prevents product yield loss associated with solvent evaporation and potential particle degradation during drying.
4Ease of manufacture
If solvent-based slurry coating is used, then appropriate viscosity is achieved, but purchase costs and storage burdens increase
Solution Approach 1:
The invention extracts and removes the solvent component that provides viscosity in conventional slurry coating. By using electrostatic charging to deposit dry, charged inorganic particles directly onto the substrate, the system eliminates the need for viscosity control through solvent selection, thereby eliminating purchase costs and storage burdens associated with solvent management.
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
This approach eliminates solvent-related costs and drying steps, enabling rapid and effective coating of lithium secondary battery components, reducing production costs and improving performance.
Implementation Method 1
charging the inorganic particles to form charged inorganic particles
Implementation Method 2
fixing the coating layer with heat and pressure
Data Source
AI summary
The present invention provides a method of coating a substrate for a lithium secondary battery with inorganic particles, comprising charging the inorganic particles to form charged inorganic particles; transferring the charged inorganic particles on the substrate for a lithium secondary battery to form a coating layer; and fixing the coating layer with heat and pressure. Such a coating method according to one embodiment of the present invention uses electrostatic force without the addition of a solvent, and therefore, non use of a solvent can result in cost-reducing effects since there is no burden on the handling and storing of the solvent, and since a drying procedure after slurry coating is not needed, it allows for the preparation of a lithium secondary battery in a highly effective and rapid manner.