Porous Aluminum Battery Anode Structure for Low Capacity Decay
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Solution Overview
Problem
The capacity decay rate of aluminum batteries is affected by the aluminum dissolution reaction on the negative electrode, and existing designs fail to effectively improve this performance for scale-up production.
Innovation Solution
A negative electrode structure comprising a hole material layer with a high specific surface area and an aluminum metal plating layer electroplated using aluminum salt-based ionic liquid, which increases reaction sites and reduces capacity decay to less than 5% per cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the negative electrode structure is optimized to improve aluminum dissolution reaction rate, then the capacity decay rate decreases, but the electrode structure complexity increases
Solution Approach 1:
The patent applies composite materials by combining a hole material layer (activated carbon, graphite, or carbon black) with an aluminum metal plating layer. This composite structure leverages the high surface area of hole materials and the reactive aluminum surface to synergistically improve aluminum dissolution reaction rate, reducing capacity decay rate to less than 5% per cycle while managing structural complexity through a two-layer design.
Solution Approach 2:
The patent utilizes porous materials by employing hole material layers with high specific surface area (100-3000 m²/g) as the base structure. The porous/holey structure provides numerous reaction sites that enhance aluminum dissolution kinetics. When combined with the aluminum plating layer, this porous architecture significantly improves battery reliability without requiring complex multi-component structures.
2Productivity
If the specific surface area of the hole material layer is increased to enhance reaction sites, then the aluminum dissolution reaction rate improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by specifying a range for specific surface area (100-3000 m²/g) and weight ratio (2-100 mg/cm²) rather than requiring precise single-value control. This approach allows manufacturers to achieve improved aluminum dissolution reaction rates while accommodating variations in manufacturing processes. The electroplating method further enables controlled deposition within this range without demanding extreme precision.
Solution Approach 2:
The patent uses ionic liquid as an intermediary medium for electroplating the aluminum metal layer onto the hole material layer. This intermediary approach enables controlled aluminum deposition that achieves the desired weight range (2-100 mg/cm²) and surface area characteristics without requiring direct, high-precision control of the complex multi-parameter electrode structure, thus improving productivity while managing manufacturing precision requirements.
3Reliability
If the weight of the metal plating layer is increased to improve reaction activity, then the capacity decay rate decreases, but the cost of materials increases
Solution Approach 1:
The patent applies parameter changes by defining an optimal weight range for the aluminum metal plating layer (2-100 mg/cm²) rather than using excessive amounts. This controlled parameter approach ensures sufficient reaction activity to achieve capacity decay rate of less than 5% per cycle while avoiding unnecessary material consumption. The electroplating process enables precise control within this range, optimizing the balance between reliability improvement and material quantity.
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 composite electrode design enhances the performance of aluminum batteries by reducing capacity decay and facilitating scale-up production through increased reaction sites and efficient aluminum dissolution.
Implementation Method 1
the metal plating layer is electroplated on the hole material layer by ionic liquid
Implementation Method 2
the metal plating layer is electroplated on the hole material layer by ionic liquid. the ionic liquid includes aluminum salt-based ionic liquid
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A negative electrode structure applied to an aluminum battery includes a hole material layer (111) and a metal plating layer (112). The metal plating layer (112) is located on the hole material layer (111) such that the capacity decay rate of the aluminum battery is less than 5% per cycle.