Lithium Anode Assembly with Protective Metal Layer
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Solution Overview
Problem
Current methods for producing lithium anodes for solid-state batteries are costly and inefficient, with high capital investment requirements, fire hazards from flammable organic electrolytes, and the need for expensive current collectors like copper, which limits the scalability and safety of lithium metal anode production.
Innovation Solution
A low-cost lithium anode assembly using an aluminum foil current collector with a protective metal layer, such as copper, gold, or silver, bonded to a lithium metal layer, formed through a roll-to-roll physical vapor deposition process, which reduces the risk of reaction between lithium and the current collector and allows for scalable production without breaking the vacuum chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electroplating or electrodeposition is used to form lithium anodes, then lithium coating can be applied to substrates, but the production rate is low and capital investment is high
Solution Approach 1:
The patent replaces electrochemical deposition methods (electroplating/electrodeposition) with a physical vapor deposition method. This substitution eliminates the need for complex electrochemical equipment, electrolyte systems, and electrical power supplies, thereby reducing capital investment while enabling higher production rates through a simpler, more direct physical deposition process.
2Reliability
If electroplating or electrodeposition is used, then lithium coating can be achieved, but fire hazards arise from flammable organic electrolytes
Solution Approach 1:
The patent extracts and removes the flammable organic electrolyte component from the deposition system entirely. By using physical vapor deposition instead of electrochemical methods, the harmful electrolyte is completely eliminated, replacing it with a vapor-phase process that uses no liquid electrolytes, thereby eliminating fire hazards while maintaining the ability to deposit lithium coatings.
Solution Approach 2:
The patent employs a vacuum environment for the physical vapor deposition process, creating an inert atmosphere that eliminates fire hazards associated with flammable electrolytes. The vacuum chamber provides a controlled environment where lithium deposition occurs without the presence of oxygen or flammable liquids, inherently improving safety.
3Reliability
If copper current collectors are used with lithium anodes, then electrical conductivity is achieved, but unwanted reactions occur between lithium and copper
Solution Approach 1:
The patent introduces an intermediary protective layer between the lithium anode and copper current collector. This intermediate layer prevents direct contact and unwanted chemical reactions between lithium and copper, while still allowing electrical conductivity to pass through. The protective layer acts as a mediator that maintains both chemical stability and electrical function.
4Reliability
If physical vapor deposition is used to deposit lithium, then reaction risk is reduced, but the process requires vacuum chamber operation
Solution Approach 1:
The patent designs the vacuum chamber to serve multiple functions: it provides the inert atmosphere needed for safe lithium deposition, enables the physical vapor deposition process, and prevents unwanted reactions during handling. By consolidating these functions into a single system, the vacuum chamber becomes a multi-functional device that justifies its complexity through delivering multiple benefits simultaneously.
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 solution enables the production of low-cost, scalable, and safe lithium anode assemblies that reduce the risk of unwanted reactions and eliminate the need for expensive materials, thereby facilitating the adoption of lithium metal solid-state batteries.
Implementation Method 1
formed through a roll-to-roll physical vapor deposition process
Implementation Method 2
aluminum foil current collector with a protective metal layer... bonded to a lithium metal layer
Data Source
AI summary
An anode assembly for use in a lithium-based battery may include a current collector comprising aluminum, at least a first protective layer bonded to and covering a portion of the collector and being formed from a protective metal that is electrically conductive, and at least a first reactive layer comprising lithium metal bonded to the protective. The first protective layer can be disposed between the support surface and the reactive layer so that electrons can travel from the first reactive layer to the current collector and the first reactive layer is spaced from and at least substantially ionically isolated from the support surface, and whereby diffusion of the reactive layer to the current collector is substantially prevented, by the first protective layer thereby inhibiting reactions between the lithium metal and the current collector.