Cross-Linked Microporous Anode Layer for Lithium Dendrite Suppression
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Solution Overview
Problem
Existing lithium metal anode-based batteries face instability due to lithium dendrite formation and poor interfacial characteristics, leading to reduced Coulombic efficiency and potential explosions, while current polymer-based protection layers fail to provide both high ionic conductivity and mechanical strength.
Innovation Solution
A cross-linked film is formed by mixing carboxylated polymer of intrinsic microporosity with epoxy resin, applied to the lithium metal anode surface, ensuring uniform lithium ion conductivity and improved interfacial characteristics through a 1-component composition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If poly(ethyleneoxide) (PEO) polymer is used as anode protection layer, then lithium ion conduction is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent combines PEO polymer with inorganic particles (such as Al2O3, SiO2, TiO2, or their composites) to create a composite protection layer. This composite structure allows the PEO to provide lithium ion conduction pathways while the inorganic particles provide mechanical strength and structural stability, resolving the contradiction between ion conduction and mechanical properties
Solution Approach 2:
The patent introduces a porous structure in the protection layer with controlled pore size (1-10 nm) and porosity (30-70%). The porous structure provides channels for lithium ion transport, improving ion conduction, while the porous framework maintained by inorganic particles preserves mechanical integrity, thus resolving the contradiction between ion conduction and mechanical strength
2Reliability
If degree of crystallinity in PEO is reduced to improve ionic conductivity, then lithium ion movement is improved, but mechanical properties are degraded
Solution Approach 1:
By incorporating inorganic particles into the PEO matrix, the patent creates a composite where the amorphous PEO regions provide high ionic conductivity while the inorganic particle network provides mechanical strength, allowing reduced crystallinity without mechanical degradation
Solution Approach 2:
The patent changes the physical and chemical parameters of the protection layer by controlling the ratio of crystalline to amorphous regions, adjusting pore size distribution, and modifying cross-linking density to achieve optimal balance between ionic conductivity and mechanical properties
3Reliability
If artificial anode protection layer is introduced to suppress lithium dendrite, then battery stability is improved, but device complexity increases
Solution Approach 1:
The patent employs a porous structure with specific pore size (1-10 nm) that acts as physical barriers to lithium dendrite growth while allowing lithium ion transport. This porous architecture provides dendrite suppression functionality without requiring complex multi-layer structures, thus improving battery stability while maintaining relatively simple device structure
Solution Approach 2:
The patent creates local variations in the protection layer properties, such as different pore sizes, particle distributions, or cross-linking densities in different regions, to optimize both dendrite suppression and ion conduction locally, achieving high battery stability without overall structural complexity
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 cross-linked film stabilizes lithium metal batteries by suppressing dendrite growth, enhancing long-term life and performance, with superior mechanical properties and uniform lithium ion movement.
Implementation Method 1
mixing carboxylated polymer of intrinsic microporosity with a cross-linking agent and a solvent to prepare a film-forming composition, applying the film-forming composition to electrode surface, and drying the solvent at room temperature to cause cross-linking reaction
Implementation Method 2
primarily uses polymer favorable for lithium ion conduction and interfacial characteristics
Implementation Method 3
drying the solvent at room temperature to cause cross-linking reaction
Data Source
AI summary
The present invention relates to an electrode protection layer based on a carboxylated polymer of intrinsic microporosity, and a manufacturing method therefor, and, more specifically, to an electrode protection layer based on a polymer of intrinsic microporosity, and a manufacturing method therefor, the layer being manufactured by mixing a carboxylated polymer of intrinsic microporosity with a cross-linking agent and a solvent so as to form a film-forming composition, forming a film therefrom, and then cross-linking the film.