Free-Standing Electrode Film Lamination for Breakage-Free Dry Manufacturing
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Solution Overview
Problem
Existing dry processes for manufacturing electrodes for energy storage devices face challenges in producing uniform, thin, and flexible free-standing electrode films without breaking, especially when using materials like lithium nickel manganese cobalt oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, graphite, and silicon, which are difficult to handle due to their brittleness.
Innovation Solution
An apparatus comprising a pair of mill lines with adjustable presses and conveyors that apply shear force and controlled pressure to produce and laminate free-standing electrode films on both sides of a current collector, using fibrillizable binders to enhance film strength and prevent breakage, with a modular design allowing customization for various material types and specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If dry processes are used to manufacture free-standing electrode films, then solvent expense and drying time are eliminated, but the films are difficult to handle and prone to breaking
Solution Approach 1:
The patent applies preliminary action by laminating the free-standing electrode film to a current collector immediately after film formation, before the film becomes too fragile to handle. The lamination process is integrated into the same production line, so the film is supported and reinforced while still warm and pliable, preventing breakage during subsequent handling operations.
2Volume of moving object
If thinner electrode films are produced, then energy storage device size is reduced, but the films become more difficult to handle and more prone to breaking
Solution Approach 1:
The current collector serves as an intermediary that provides mechanical support to the thin electrode film. By laminating the fragile thin film to the stronger current collector, the system enables handling of thinner films without increasing film thickness, as the current collector bears the mechanical stress during handling operations.
3Quantity of substance
If electrode films are made less flexible using battery active materials, then energy storage capacity is improved, but the films become more difficult to work with and more prone to breaking
Solution Approach 1:
The patent creates a composite structure by laminating the electrode film containing battery active materials to a current collector. This composite provides both the energy storage capacity from the active materials and the mechanical flexibility and handleability from the current collector, resolving the contradiction between high active material content and ease of operation.
4Productivity
If continuous process is implemented for producing and laminating electrode films, then productivity is improved, but the complexity of producing uniform films and handling them increases
Solution Approach 1:
The patent merges the film formation process and the lamination process into a single integrated continuous operation. Both processes occur on the same production line without interruption, eliminating the need for separate handling steps between film formation and lamination, thus reducing operational complexity despite high productivity requirements.
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 apparatus efficiently produces high-strength, thin, and uniform free-standing electrode films with controlled porosity and density, enabling the production of energy storage devices with improved mechanical strength and flexibility, capable of handling fragile materials without breakage, and allowing for a wide range of energy storage device applications.
Implementation Method 1
by subjecting the first powder mixture to a shear force
Implementation Method 2
pressing the first powder mixture into a first free-standing electrode film
Implementation Method 3
using fibrillizable binders to enhance film strength and prevent breakage
Implementation Method 4
laminating the first free-standing electrode film on a first side of a current collector
Data Source
AI summary
An apparatus for manufacturing an electrode for an energy storage device includes at least one laminator for simultaneously laminating two free-standing electrode films on opposite sides of a current collector and a pair of mill lines operable to produce, respectively, the two films and to feed the two films simultaneously to the laminator. Each mill line may have at least one press including working rolls arranged horizontally for pressing a powder mixture into a respective one of the films and at least one press including working rolls (typically arranged vertically) for reducing the thickness of the respective film. The apparatus may include a mill line expansion module that is insertable into a mill line and has at least one additional press including working rolls for reducing the thickness and controlling other key parameters of the respective film. Films may have elongation below 4% and tensile strength below 250 kPa.