Lithium-Ion Electrode Calendering With Atmospheric Plasma Deposition
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Solution Overview
Problem
Current methods for manufacturing lithium-ion cell electrodes are inefficient, leading to material wastage, high capital investment, and health and environmental hazards due to solvent use, with existing plasma deposition methods also experiencing significant material loss through overspray.
Innovation Solution
A method involving atmospheric plasma deposition of active electrode material and metal particles onto a lithium-ion cell substrate between calendering rolls, where the particles are surface-activated to form a coherent electrode layer, eliminating the need for solvents and reducing material loss by directly depositing and compressing the material into a coherent layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If liquid slurry coating method is used, then electrode material can be deposited on current collector, but significant material wastage occurs through overspray and solvent evaporation
Solution Approach 1:
The patent replaces the liquid slurry coating mechanical system with an atmospheric plasma deposition system that uses ionized gas to transport and deposit electrode material particles. This substitution eliminates solvent-based coating and significantly reduces material loss through overspray, as particles are directly deposited onto the current collector surface through plasma-mediated transport.
Solution Approach 2:
The patent changes the physical state of the deposition medium from liquid slurry to atmospheric plasma. By utilizing plasma's unique properties (ionized gas state, reactive species, and particle transport capability), the process achieves precise material deposition with minimal waste while maintaining manufacturing feasibility.
2Loss of substance
If atmospheric plasma deposition is used, then material loss is reduced, but equipment complexity and capital investment increase
Solution Approach 1:
The atmospheric plasma deposition system utilizes ambient air as the plasma medium, eliminating the need for vacuum systems or specialized gas handling infrastructure. The plasma process self-regulates particle deposition through ionization and recombination mechanisms, reducing the need for complex control systems while minimizing material loss.
Solution Approach 2:
The patent employs atmospheric plasma in ambient air conditions, creating a controlled reaction environment that protects electrode material from oxidation and contamination while simplifying equipment requirements compared to vacuum-based deposition systems.
3Manufacturing precision
If conventional coating and drying process is used, then electrode layer can be formed, but high energy consumption occurs particularly in drying step
Solution Approach 1:
The atmospheric plasma deposition process performs material deposition and bonding in a single continuous step without requiring separate drying or curing stages. The plasma's thermal and chemical energy simultaneously deposits particles and activates adhesion to the current collector, eliminating the energy-intensive drying step while maintaining precise electrode layer formation.
Solution Approach 2:
The patent utilizes plasma's phase transition properties to deposit electrode material directly from gaseous/plasma state onto the current collector surface. This phase transition approach eliminates the need for solvent evaporation and subsequent drying, significantly reducing energy consumption while ensuring precise layer formation.
4Ease of manufacture
If liquid solvent system is used, then electrode slurry can be applied, but health and fire hazards and regulated emissions are introduced
Solution Approach 1:
The patent replaces the liquid solvent-based application system with atmospheric plasma deposition. This substitution eliminates harmful solvents entirely, removing associated health hazards, fire risks, and environmental emissions while maintaining the ability to apply electrode material effectively through plasma-mediated particle transport and deposition.
Solution Approach 2:
The patent converts the potential harm of material overspray into a benefit by using atmospheric plasma to control particle deposition. The plasma's ionization and recombination mechanisms ensure particles deposit precisely where intended, transforming what was previously a waste stream into a controlled deposition process with no harmful emissions.
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 method minimizes wasteful overspray, reduces production costs, and allows for high-throughput, efficient production of electrodes with controlled thickness and density, avoiding solvent use and environmental hazards.
Implementation Method 1
The metal particles (or metal portions of the composite particles) are surface-activated, surface-softened, and/or surface-melted (hereinafter referred to together as 'surface-activated') by the atmospheric plasma
Implementation Method 2
The metal particles (or metal portions of the composite particles) are surface-activated, surface-softened, and/or surface-melted (hereinafter referred to together as 'surface-activated') by the atmospheric plasma
Implementation Method 3
depositing particles of an active electrode material and a metal (referred to together as 'electrode material') from an atmospheric plasma onto a lithium-ion cell substrate
Implementation Method 4
depositing particles of an active electrode material and a metal (referred to together as 'electrode material') from an atmospheric plasma onto a lithium-ion cell substrate
Implementation Method 5
compressed between the calendering rolls into a coherent electrode layer adhering to the substrate
Implementation Method 6
as the substrate enters a gap between opposing calendering rolls
Data Source
AI summary
Disclosed is a method and apparatus for making a lithium-ion electrochemical cell component by advancing a substrate for a lithium ion cell between opposing first and second calendering rolls, depositing by atmospheric plasma deposition particles of electrode material comprising an active electrode material and a metal into a gap between a first side of the substrate and the first calendering roll, wherein the metal is surface-activated by the atmospheric plasma; and pressing the deposited particles of the active electrode material and the metal particles between the first and second calendering rolls into an electrode layer on the first side of the substrate. The apparatus includes a pair of opposing calendering rolls, a path for advancing the substrate between the calendering rolls, and at least one atmospheric plasma deposition device connected to a supply of the particles of the electrode material positioned to deposit particles of the electrode material into the gap between the substrate and one of the pair of opposing calendering rolls.