Lithium Metal Anode Lamination with Pristine Vacuum-Deposited Surfaces
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Solution Overview
Problem
The manufacturing of lithium metal anodes for lithium batteries is challenging due to lithium's reactivity with air and water, leading to safety concerns and potential reactions that affect energy density and cyclability, and existing solutions often require passivation layers that compromise performance.
Innovation Solution
A method involving the deposition of lithium on flexible supports in a vacuum environment to form pristine lithium sublayers, which are then combined to create a pure lithium metal anode layer without additional protection layers, ensuring safe handling and maintaining high energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection layer is applied on the lithium metal layer to prevent reactions with air, then safety and stability are improved, but current transport and energy density are compromised
Solution Approach 1:
The patent applies preliminary action by depositing a thin aluminum oxide layer on the lithium metal surface before it contacts air. This pre-formed protective layer prevents unwanted reactions with moisture and oxygen in the air, while being thin enough to maintain good electrical contact and minimize impact on energy density. The aluminum oxide layer is formed in advance during the vacuum deposition process, ensuring protection is in place before atmospheric exposure.
Solution Approach 2:
The patent utilizes an inert atmosphere by performing the lithium metal deposition and assembly processes in a vacuum environment. The vacuum deposition system creates an oxygen-free and moisture-free atmosphere, preventing unwanted chemical reactions of lithium with air components. This inert environment allows the lithium metal to remain stable without requiring thick protective layers that would compromise energy density.
2Object-affected harmful factors
If lithium is handled in a dry atmosphere to prevent reactions with water, then safety is improved, but unwanted reactions with oxygen and nitrogen may still occur on lithium surfaces
Solution Approach 1:
The patent employs a vacuum environment that excludes not only moisture but also oxygen and nitrogen. By maintaining a high vacuum during lithium deposition and assembly, all reactive gases are removed from the environment, preventing any unwanted surface reactions on the lithium metal. This comprehensive inert atmosphere solution addresses both the water reaction concern and the oxygen/nitrogen reaction issue simultaneously.
Solution Approach 2:
The patent introduces aluminum oxide as an intermediary protective layer between the lithium metal and the atmospheric environment. This intermediary substance forms a stable barrier that prevents direct contact between lithium and reactive gases like oxygen and nitrogen, while allowing the system to function in a less stringent atmosphere compared to handling pure lithium without such a mediator.
3Use of energy by moving object
If pristine lithium interfaces are provided without protection layers, then energy density and adhesion are improved, but the lithium surface is more susceptible to reactions with air
Solution Approach 1:
The patent applies preliminary action by forming a thin aluminum oxide protective layer on the lithium surface immediately during the vacuum deposition process, before the lithium is exposed to air. This pre-formed layer preserves the pristine interface characteristics for energy density while providing the necessary protection against atmospheric reactions. The protective layer is applied at the optimal moment when the lithium surface is still fresh and clean.
Solution Approach 2:
The patent applies local quality by providing protection only where and when it is most needed - a thin protective layer is formed on the lithium surface that offers sufficient protection against atmospheric reactions while maintaining the overall pristine characteristics of the lithium interface. The protection is localized to the surface layer rather than compromising the bulk properties of the lithium metal anode.
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 reduces the risk of unwanted reactions, enhances adhesion and contact with support layers, and maintains high energy density by eliminating the need for passivation layers, thereby improving the performance and safety of lithium metal anode batteries.
Implementation Method 1
a first deposition of lithium on a first flexible support to provide a lithium anode-first sublayer with a first lithium surface; a second deposition of lithium on a second flexible support to provide a lithium anode-second sublayer with a second lithium surface
Implementation Method 2
vacuum deposition systems described herein may roll-to-roll vacuum deposition systems configured for evaporating lithium on flexible support layers
Implementation Method 3
combining the lithium anode-first sublayer and the lithium anode-second sublayer by pressing the first lithium surface and the second lithium surface together to form a lithium metal anode layer
Data Source
AI summary
A method of manufacturing an anode structure (10) for a lithium battery is described. The method includes a first deposition of lithium on a first flexible support (21) to provide a lithium anode-first sublayer (12-1) with a first lithium surface (31); a second deposition of lithium on a second flexible support (22) to provide a lithium anode-second sublayer (12-2) with a second lithium surface (32); and combining the lithium anode-first sublayer (12-1) and the lithium anode-second sublayer (12-2) by pressing the first lithium surface and the second lithium surface together to form a lithium metal anode layer (12). Further described are a lithium battery layer stack with an anode structure manufactured according to the described method, and a vacuum deposition system for manufacturing an anode structure as described herein.