Lithium Metal Anode Protective Film for Dendrite Suppression
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Solution Overview
Problem
Lithium metal anodes in batteries face issues with lithium dendrite growth during charging and discharging, leading to reduced lifespan, internal short-circuits, and safety risks such as fires and explosions, due to unstable film formation and high reactivity with the electrolyte.
Innovation Solution
A lithium metal anode protective film comprising lithium nitride (Li3N) nanoparticles, lithium-magnesium (Li-Mg) alloy nanoparticles, or a combination thereof, is formed on the lithium metal layer to induce uniform electrodeposition and suppress dendrite growth, using an in-situ reaction to stabilize the lithium metal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is formed on the lithium metal layer to suppress dendrite growth, then safety and stability are improved, but unnecessary material formation occurs and energy density is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the protective film by using lithium nitride and lithium-magnesium alloy nanoparticles instead of conventional thick protective layers. This chemical parameter change enables effective dendrite suppression with minimal material quantity, thus improving stability while maintaining energy density.
Solution Approach 2:
The patent employs a composite protective film structure combining lithium nitride nanoparticles and lithium-magnesium alloy nanoparticles. This composite material approach provides synergistic effects where both components work together to suppress dendrite growth more effectively than single materials, reducing the total amount of protective material needed and preserving energy density.
2Object-generated harmful factors
If conventional protective materials are used to stabilize the lithium metal layer, then dendrite growth is suppressed, but unnecessary material formation occurs and electrochemical performance is reduced
Solution Approach 1:
The patent applies local quality by using nanoscale particles (1-100 nm) that can be uniformly distributed on the lithium metal layer surface. This localized nanoscale protection provides targeted dendrite suppression at critical sites without forming thick unnecessary layers, thereby maintaining excellent electrochemical performance while effectively suppressing dendrite growth.
Solution Approach 2:
The patent uses small quantities of lithium nitride and lithium-magnesium alloy nanoparticles that form a thin protective layer. This approach replaces conventional thick protective materials with minimal amounts of functional nanoparticles that provide sufficient protection against dendrites while maintaining high electrochemical performance, effectively using 'less is more' strategy.
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 protective film enhances electrochemical performance and stability, preventing unnecessary material formation and improving energy density and safety by ensuring uniform lithium ion distribution and reducing dendrite growth.
Implementation Method 1
forming a material for protecting a surface of a lithium metal layer on the surface of the lithium metal layer by an In-situ reaction
Implementation Method 2
induce uniform electrodeposition behavior and distribution of lithium ions
Data Source
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AI summary
A lithium metal anode protective film includes lithium nitride (Li3N) nanoparticles, lithium-magnesium (Li-Mg) alloy nanoparticles, or a combination thereof. The lithium metal anode protective film may induce uniform electrodeposition behavior and distribution of lithium ions, thereby effectively suppressing growth of lithium dendrites during battery a battery charging/discharging process.