Lithium-Air Battery Anode Sealing Structure Against Dendrite Growth
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Solution Overview
Problem
Lithium-air batteries face degradation in charge-discharge performance due to the deposition of dendrites on the anode terminal and the dispersion of minute lithium powder in the electrolytic solution, which reduces the effectiveness of the anode active material.
Innovation Solution
An anode composite structure is developed for lithium-air batteries, comprising a solid electrolyte, an air electrode, an anode current collector, an anode layer made of metallic lithium or its alloys, and a separator that seals the anode layer and prevents direct contact with the solid electrolyte, thereby reducing dendrite formation and lithium powder dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If metallic lithium is used as anode active material to achieve high energy density, then energy density is improved, but dendrite formation and lithium powder dispersion occur causing performance degradation
Solution Approach 1:
A separator is introduced as an intermediary component between the metallic lithium anode layer and the solid electrolyte. This separator prevents direct contact and interaction between the lithium metal and solid electrolyte, thereby suppressing dendrite formation and lithium powder dispersion while maintaining the high energy density benefits of metallic lithium anode
Solution Approach 2:
A thin film separator is used to isolate the metallic lithium anode from the solid electrolyte. This thin film structure provides effective physical separation to prevent harmful interactions (dendrite formation and lithium powder dispersion) while maintaining compact battery structure and high energy density
2Reliability
If separator is introduced to prevent dendrite formation, then reliability is improved, but device complexity increases
Solution Approach 1:
A thin film separator is employed rather than a thick or complex barrier structure. This thin film approach provides the necessary isolation function to prevent dendrite formation and lithium powder dispersion while minimizing the increase in device complexity and maintaining a compact overall structure
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 anode composite structure enhances the charge-discharge performance of lithium-air batteries by minimizing the production of dead lithium and maintaining the integrity of the anode active material, leading to more stable and efficient battery operation.
Implementation Method 1
a separator stacked on the anode layer, wherein the anode layer is sealed in by the separator and the anode current collector
Implementation Method 2
The anode composite structure comprises an electron conducting layer on an inner side of the separator
Data Source
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AI summary
An objective is to provide an anode composite structure for use in a lithium-air battery to make the lithium-air battery less likely to degrade in charge-discharge performance. Provided is an anode composite structure for a lithium-air battery, including: an anode current collector; an anode layer stacked on the anode current collector, the anode layer being metallic lithium, an alloy containing lithium as a main component, or a chemical compound containing lithium as a main component; and a separator stacked on the anode layer. The anode layer is sealed in by the separator and the anode current collector.