Lithium Battery Electrode Hole Structure for Fast Charge
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in achieving high power and fast charge characteristics due to limitations in electrolyte immersion ability and lithium ion mobility.
Innovation Solution
The development of an electrode with an active material layer featuring a combination of first and second holes, where the second hole has a greater depth than the first hole, with a depth ratio of about 1:2 to 1:5, enhancing electrochemical characteristics by increasing reaction surface area and improving electrolyte impregnation and lithium ion mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode uses a conventional flat active material layer structure, then the manufacturing process is simple, but the electrolyte immersion ability and lithium ion mobility are insufficient
Solution Approach 1:
The active material layer is designed with a porous structure containing multiple holes of different depths (first holes and second holes), which increases electrolyte immersion ability and lithium ion mobility while maintaining manufacturing feasibility through controlled hole formation processes
2Device complexity
If the electrode uses a conventional flat active material layer structure, then the structure is simple, but the high power and fast charge characteristics are insufficient
Solution Approach 1:
The electrode structure incorporates local variations in hole depth (first holes and second holes at different depths) within the active material layer, creating localized regions with different electrolyte access and ion transport properties that enhance overall power and fast charge characteristics
3Quantity of substance
If the electrode uses a conventional flat active material layer structure, then the active mass density is sufficient, but the lithium ion mobility is limited
Solution Approach 1:
The electrode structure transitions from a two-dimensional flat surface to a three-dimensional porous structure with holes at different depths, creating additional pathways for lithium ion transport through the active material layer while preserving active mass density
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
This configuration results in improved high power and fast charge capabilities by compensating for ion resistance and active mass density issues, leading to enhanced battery performance.
Implementation Method 1
improving electrolyte impregnation and lithium ion mobility
Data Source
AI summary
An electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The electrode includes an active material layer including an active material and having a first hole and a second hole, the second hole having a depth greater than a depth of the first hole, wherein a ratio of the depth of the first hole to (:) the depth of the second hole is about 1:2 to about 1:5.