Lithium Metal Protective Layer Composition for Dendrite Suppression
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Solution Overview
Problem
Lithium metal used in secondary batteries reacts with electrolytes, forming unstable films that lead to non-uniform current distribution, degraded ion conductivity, mechanical weakness, and potential for lithium dendrite growth, causing short circuits and explosions.
Innovation Solution
A composition for a lithium metal protective layer using nitromethane, dimethoxyethane, and lithium nitrate forms a protective layer on the lithium metal surface, enhancing ionic conductivity and mechanical strength by creating lithium nitride and oxide layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as anode material, then energy density and capacity are improved, but reactivity with electrolyte increases forming unstable films
Solution Approach 1:
The patent applies preliminary action by pre-forming a stable protective layer on the lithium metal surface before the battery operates. The protective layer composition containing nitromethane, dimethoxyethane, and lithium nitrate is applied to the lithium metal surface in advance, creating a stable film that prevents subsequent degradation and reactions with the electrolyte during charge-discharge cycles.
Solution Approach 2:
The patent uses composite materials by combining multiple components (nitromethane, dimethoxyethane, and lithium nitrate) to form a composite protective layer. This composite structure leverages the complementary properties of each component: nitromethane provides initial film formation, dimethoxyethane enhances stability, and lithium nitrate contributes to the overall protective characteristics, creating a synergistic effect that superiorly protects the lithium metal.
2Manufacturing precision
If unstable film forms on lithium metal surface, then current distribution becomes non-uniform, but ion conductivity and mechanical strength are degraded
Solution Approach 1:
The patent applies parameter changes by carefully controlling the composition ratios of nitromethane (30-70 wt%), dimethoxyethane (30-70 wt%), and lithium nitrate (0.01-3.0 wt%) in the protective layer. By optimizing these parameters, the protective layer achieves the right balance between uniformity (for current distribution) and ion conductivity, ensuring both homogeneous current distribution and high ionic transport capability.
3Reliability
If protective layer is formed on lithium metal, then stability and ion conductivity are improved, but manufacturing process complexity increases
Solution Approach 1:
The protective layer is formed as a preliminary step before battery assembly, simplifying the overall manufacturing process. By preparing the protective layer composition and applying it to the lithium metal surface in advance, the patent avoids the need for complex in-situ formation processes during battery operation, reducing overall process complexity while ensuring electrode stability.
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 layer suppresses lithium dendrite growth, improves interfacial resistance, and stabilizes the lithium electrode, leading to enhanced life-span and capacity of lithium secondary batteries.
Implementation Method 1
lithium nitride and lithium oxide may be formed by a reductive reaction of nitromethane and lithium nitrate
Data Source
AI summary
A composition for a lithium metal protective layer includes an organic solvent comprising nitromethane and dimethoxyethane, and lithium nitrate (LiNO3). A content of nitromethane is in a range from 30 wt % to 70 wt % based on a total weight of the organic solvent. In a method of fabricating a lithium electrode, a protective layer is formed on a surface of a lithium metal layer by immersing the lithium metal layer in the composition for a lithium metal protective layer.