Electrode Coating Porosity Tuning After Calendering
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Solution Overview
Problem
The calendering process used to compact electrode coatings in energy storage cells obstructs electrolyte penetration, leading to longer electrolyte filling times, increased production costs, and reduced performance.
Innovation Solution
A method involving blasting, specifically CO2 snow blasting, is applied to the electrode coating after calendering to increase porosity and facilitate electrolyte penetration, thereby decoupling the compaction and porosity adjustment processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the coating is calendered to compact it and reduce cavity size, then the volumetric energy density is increased and particle contacting is improved, but the soaking of electrolyte into the coating is obstructed
Solution Approach 1:
The coating is blasted with CO2 snow jets before electrolyte filling to pre-create pores and increase porosity. This preliminary action prepares the coating structure in advance to facilitate rapid electrolyte penetration, resolving the contradiction between compacted structure for energy density and open structure for electrolyte soaking.
2Reliability
If the coating is calendered to improve particle contacting, then the electrode performance is enhanced, but the electrolyte distribution is slowed
Solution Approach 1:
CO2 snow blasting is performed as a preliminary treatment before electrolyte filling to create a porous structure that allows rapid electrolyte distribution. This maintains the benefits of calendering for particle contacting while pre-preparing the coating for fast electrolyte penetration.
Solution Approach 2:
The coating is transformed into a porous material through CO2 snow blasting, creating a network of pores that facilitate electrolyte penetration while maintaining structural integrity and particle contacting from the calendering process.
3Reliability
If complete and uniform permeation of pore volume with electrolyte is achieved, then the ionic conductivity and discharge capacity are improved, but the production time is increased
Solution Approach 1:
The coating is pre-treated with CO2 snow blasting to create an optimized pore structure before electrolyte filling. This preliminary pore creation ensures that electrolyte can rapidly and uniformly permeate the entire pore volume, achieving complete saturation faster and improving both ionic conductivity and production efficiency.
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 method accelerates electrolyte permeation and distribution within the electrode coating, reducing production time and costs while maintaining high performance standards.
Implementation Method 1
blasting the coating, in particular to activate or roughen it... The blasting result is substantially dependent on the type of the selected blasting agent... Depending on the type of the method control and the blasting agents used, greatly varying technical effects can be achieved. In the present case, blasting is preferably used to activate the coating, in particular to roughen it and/or to create pores.
Implementation Method 2
blasting by means of CO2 snow jets... CO2 snow particles are expediently accelerated with the aid of a compressed air jet onto the coating, where they have, inter alia, an abrasive effect. In this way, small channels and/or pores are created there, through which the electrolyte can penetrate and distribute itself.
Implementation Method 3
compressed air blasting is used in the present case. A preferably solid blasting agent is used in this case, which is accelerated by compressed air as it flows through a nozzle.
Implementation Method 4
the distribution of the electrolyte, driven by capillary forces, within the electrode structure
Data Source
AI summary
A method for producing an electrode for an electrical energy storage cell includes the steps of providing a carrier material, coating the carrier material with coating material for producing a coating, and blasting the coating, in particular for adjusting the porosity thereof.