Structured Metal Electrode Coating for Lower Lithium Deposition Resistance
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Solution Overview
Problem
Lithium metal electrodes in batteries face limitations due to high deposition resistance and safety concerns, particularly when used with non-liquid electrolytes, which affect their cycle stability and practical application.
Innovation Solution
A metal electrode with recesses coated with a solid polymer electrolyte is used, reducing deposition resistance and improving contact with non-liquid electrolytes, enhancing the safety and lifespan of lithium electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium metal electrodes are used with non-liquid electrolytes, then safety is improved, but deposition resistance increases
Solution Approach 1:
The patent applies local quality by creating recesses in specific locations on the lithium metal electrode surface and selectively coating these recesses with solid polymer electrolyte. This localized modification reduces deposition resistance at the recess sites while maintaining the safety benefits of non-liquid electrolytes throughout the entire electrode structure.
Solution Approach 2:
The solid polymer electrolyte acts as an intermediary substance that bridges the interface between the lithium metal electrode and the non-liquid electrolyte. It is applied as a coating on the recesses of the electrode surface, facilitating better contact and reducing deposition resistance without compromising the inherent safety advantages of using non-liquid electrolytes.
2Reliability
If lithium metal electrodes are used with non-liquid electrolytes, then safety is improved, but cycle stability deteriorates
Solution Approach 1:
The patent implements local quality by structuring the electrode surface with recesses and applying solid polymer electrolyte coating specifically to these recess areas. This localized treatment improves cycle stability by enhancing contact at critical deposition sites while preserving the overall safety benefits of the non-liquid electrolyte system throughout the battery's operational cycles.
Solution Approach 2:
The solid polymer electrolyte is applied in advance as a pre-coating on the recesses of the lithium metal electrode before assembly with the non-liquid electrolyte. This preliminary action ensures optimal contact conditions are established beforehand, improving cycle stability from the first charge-discharge cycle while maintaining the safety advantages of the non-liquid electrolyte configuration.
3Reliability
If the electrode surface is structured with recesses, then contact with electrolyte is improved, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes a porous-like structured surface with recesses on the lithium metal electrode. This structuring improves electrolyte contact by creating multiple contact points and increasing surface area. The recesses can be fabricated using established techniques such as laser drilling, mechanical punching, or chemical etching, which, while adding some manufacturing steps, use成熟 technologies rather than entirely new processes.
Solution Approach 2:
The patent creates a composite structure by combining the lithium metal electrode with a solid polymer electrolyte coating applied to the recessed areas. This composite approach improves electrolyte contact through the structured surface geometry and the coating material properties, while the manufacturing complexity is managed by applying the coating using standard techniques such as dip-coating, spray-coating, or roll-to-roll processing.
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 combination of structured metal electrodes with solid polymer electrolyte coatings significantly reduces cell resistance, improves cyclability, and increases safety, particularly when used with non-liquid electrolytes like gel polymers or ceramics.
Implementation Method 1
the surface of the metal electrode or current collector with a functional coating, in particular with a solid polymer electrolyte, is provided
Implementation Method 2
Charge transport occurs through the movement of the cations, particularly lithium ions, of the salt through the polymer electrolyte
Data Source
Figure 1~3b
Figure 4a~4c
Figure 5a~5b
AI summary
The invention relates to a metal electrode or current collector for an energy store, wherein the surface of the electrode or of the power collector comprises a plurality of blind hole-like recesses, which are spaced apart from each other, the surface structured in this way being coated with a solid polymer electrolyte, the recesses being filled with the solid polymer electrolyte. The invention further relates to a primary or secondary energy store comprising same.