Metalized Separator Anode Assembly for Uniform Lithium Plating
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Solution Overview
Problem
Existing high-energy density batteries face issues with substrate-induced defects, non-uniform coating, interfacial resistance, and increased weight and volume due to copper substrates, which affect performance and energy density.
Innovation Solution
A metalized separator is developed with a single-sided deposition of metallic active anode material on a polymeric or solid-state separator, using PVD, allowing for a recess for a metallic tab and optional conductive or performance-enhancing layers, reducing the need for a separate passivation layer and minimizing copper usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If double-sided coating of substrate is used to create anode material, then the anode components are formed on both sides of the substrate, but the active material on one side is exposed to web-handling equipment and thermal effects which lead to defects and non-uniform properties
Solution Approach 1:
The patent divides the anode structure into separate components: a substrate and a current collector, with active material deposited only on the current collector side. This segmentation allows the substrate to serve as a structural support while the current collector provides the functional surface, avoiding the defects associated with double-sided coating.
Solution Approach 2:
The patent extracts the functional coating process from the substrate and applies it only to the current collector. By separating the substrate's structural role from the active material deposition, the invention eliminates the harmful exposure of active material to web-handling equipment and thermal effects during double-sided coating.
2Strength
If copper substrate is used as current collector, then the anode assembly is structurally stable, but the cell weight and volume increase, reducing specific energy and energy density
Solution Approach 1:
The patent employs a thin copper substrate that serves primarily as a structural support during manufacturing, which is then replaced or integrated with a lighter current collector material. This approach allows the use of structurally stable copper during production while achieving weight reduction in the final product.
Solution Approach 2:
The patent uses composite structures combining substrate materials with current collector materials, optimizing both structural stability and weight characteristics. The composite design allows different materials to fulfill different functions: structural support and electrical conduction with minimal weight.
3Duration of action of stationary object
If passivation layer is applied to anode active material surface to prevent reactions with ambient atmosphere, then shelf-life is extended, but additional materials are introduced to the interface which limit maximum cell performance
Solution Approach 1:
The patent applies passivation treatment during the manufacturing process immediately after active material deposition, creating a protective layer before the material is exposed to ambient atmosphere. This preliminary action prevents oxidation and degradation without requiring thick additional protective layers that would increase interfacial resistance.
Solution Approach 2:
The patent optimizes the thickness and composition of the passivation layer to achieve the minimum necessary protection against atmospheric reactions. By carefully controlling the passivation parameters, the invention extends shelf-life while minimizing the impact on electrical performance and interfacial contact.
4Manufacturing precision
If physical vapour deposition is used to deposit active anode material, then precise control of deposition thickness is achieved, but the top surface develops significant curvature and texture that negatively impact stripping and plating uniformity
Solution Approach 1:
The patent introduces a current collector as an intermediary layer between the substrate and the active material deposition surface. This intermediary provides a stable, flat base that compensates for surface curvature and texture developed during PVD processing, ensuring uniform stripping and plating performance.
Solution Approach 2:
The patent applies different surface treatment methods to different regions of the anode structure. The substrate and current collector receive treatments optimized for structural stability, while the active material surface receives localized processing to maintain flatness in the critical deposition zones without compromising overall thickness control.
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 enhances stripping and plating uniformity, reduces defects, and improves energy density by protecting the critical surface from atmospheric reactions and optimizing interfacial contact, while allowing for lightweight designs.
Implementation Method 1
a layer of metallic active anode material deposited on the first surface, such as by physical vapour deposition (PVD)
Data Source
AI summary
A metalized separator includes: a separator substrate having a first surface; and a layer of metallic active anode material deposited on the first surface. The layer of metallic active anode material may be deposited by physical vapour deposition (PVD). A separator assembly including the metalized separator, a battery cell containing one or more of the metalized separators, and a process of producing the metalized separator, are also disclosed.