Printable Lithium Foil Composition for Dendrite-Resistant Anodes
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Solution Overview
Problem
Existing lithium-ion batteries face challenges with lithium dendrite formation, irreversible capacity loss due to the formation of a passivation film on the anode, and limited cathode active material choices due to the need for removable lithium, leading to safety concerns and reduced capacity.
Innovation Solution
A printable lithium composition comprising lithium metal powder, a polymer binder, and a rheology modifier forms a three-dimensional structure on substrates, enhancing electrochemical performance and reducing dendrite growth, with applications in energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal anode is used to achieve high specific capacity, then battery capacity is improved, but lithium dendrite formation occurs causing safety issues
Solution Approach 1:
A thin film coating (5-50 nanometers) of aluminum oxide or aluminum hydroxide is applied to the lithium metal anode surface. This protective film acts as a barrier that prevents dendrite growth while allowing lithium ion transport, thereby maintaining high capacity while improving safety and cyclability.
Solution Approach 2:
The anode is constructed as a composite structure combining lithium metal with protective coating materials (aluminum oxide or aluminum hydroxide). This composite approach retains the high capacity benefits of lithium metal while the coating layer provides dendrite suppression and improved stability during cycling.
2Reliability
If carbon-based anode material is used to avoid lithium dendrite formation, then safety is improved, but battery capacity is reduced due to limited lithium supply from cathode
Solution Approach 1:
The lithium metal anode is pre-treated with a protective coating before battery assembly. This preliminary protection enables the lithium metal to function safely without dendrite formation, allowing the battery to achieve high capacity while maintaining safety throughout cycling operations.
3Weight of moving object
If thin lithium foil is used to reduce weight and improve performance, then energy density is improved, but manufacturing precision and uniformity become difficult to achieve
Solution Approach 1:
Instead of manufacturing ultra-thin lithium foil directly, the invention applies a thin film coating (5-50 nanometers) onto a lithium metal anode. This approach achieves the weight reduction benefits of thin structures while avoiding the manufacturing difficulties of producing uniformly thin lithium foil, as the coating can be applied using standard thin film deposition techniques.
Data Source
AI summary
A substrate coated with a printable lithium composition is provided. The printable lithium composition includes lithium metal powder; a polymer binder, wherein the polymer binder is compatible with the lithium powder; and a rheology modifier compatible with the lithium powder and the polymer binder, wherein the rheology modifier is dispersible within the composition and provides a three-dimensional support structure for further improvement of the electrochemical performance of the electrode when coated with the composition. The substrate may be incorporated into a battery. In one embodiment, the battery comprises a cathode, an electrolyte and an anode, wherein the cathode, the electrolyte, the separator, the anode, or a combination thereof may each comprise a substrate coated with a printable lithium composition.