Aluminum Organic Cathode Composition for Reversible Ion Intercalation
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Solution Overview
Problem
Current lithium-ion batteries (LIBs) are unsuitable for renewable energy storage due to limited cycle life, safety concerns, and high cost, while rechargeable aluminum batteries (ALBs) face challenges in designing electrode materials for reversible aluminum ion intercalation and stable electrolytes.
Innovation Solution
Development of cathode materials comprising a macrocycle with substituted or unsubstituted phenanthrenequinone units in a triangular arrangement, combined with graphite flakes, and an aluminum halide electrolyte, such as tetrachloroaluminate, to enhance the performance of rechargeable aluminum organic batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium-ion batteries are used for energy storage, then high energy density is achieved, but cycle life is limited and safety concerns arise
Solution Approach 1:
The patent changes the fundamental parameters of the battery system by replacing lithium ions with aluminum ions, transitioning from Li-ion to Al-ion battery chemistry. This parameter change enables higher theoretical volumetric capacity (8056 mAh cm−3 for Al vs. Li) while improving safety and cycle life, as aluminum is more abundant and less prone to thermal runaway issues
Solution Approach 2:
The patent employs composite electrode materials combining organic cathode materials with conductive additives and binder systems. The cathode comprises organic compounds with redox-active groups combined with conductive carbon materials, creating a composite structure that maintains high capacity while improving electrical conductivity and structural stability for longer cycle life
2Quantity of substance
If rechargeable aluminum batteries are designed, then higher theoretical volumetric capacity is achieved, but electrode materials for reversible aluminum ion intercalation are difficult to design
Solution Approach 1:
The patent changes the approach to aluminum ion intercalation by using organic cathode materials with specific redox-active functional groups that can reversibly accommodate Al3+ ions. The organic materials' flexible structures and tunable redox potentials enable reversible intercalation, solving the complexity of finding suitable electrode materials while maintaining high volumetric capacity
Solution Approach 2:
The patent introduces local functional groups with specific redox activity into the organic cathode structure. These localized redox-active sites (such as quinone, hydroquinone, or other electron-accepting groups) provide specific binding locations for aluminum ions, enabling reversible intercalation while the rest of the organic framework maintains structural integrity and conductivity
3Reliability
If organic cathode materials are used in aluminum batteries, then reversible aluminum ion intercalation is achieved, but electrical conductivity is reduced
Solution Approach 1:
The patent creates composite cathode materials by combining organic redox-active compounds with conductive carbon materials (such as graphene, carbon nanotubes, or conductive carbon black). This composite structure provides dual functionality: the organic component enables reversible aluminum ion intercalation while the conductive carbon network maintains high electrical conductivity for power delivery
Solution Approach 2:
The conductive carbon material acts as an intermediary between the organic cathode material and the current collector. It facilitates electron transport while allowing aluminum ions to access the organic redox-active sites, thereby mediating between the requirements for reversible intercalation and electrical conductivity
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 proposed solution achieves a reversible specific capacity of 126 mAh/g with improved cyclability and conductivity, addressing the limitations of existing LIBs and ALBs by enabling efficient intercalation of aluminum ions and enhancing energy storage capabilities.
Implementation Method 1
The cathodic materials used herein comprise a macrocycle comprising a substituted or unsubstituted phenanthrenequinone unit and a graphite flake
Implementation Method 2
Suitably, the electrolyte comprises an aluminum halide. In certain embodiments, the aluminum halide is tetrachloraluminate
Data Source
AI summary
Disclosed herein are rechargeable aluminum organic batteries and active materials used therein. The cathodic materials used herein comprise a macrocycle comprising a substituted or unsubstituted phenanthrenequinone unit and a graphite flake.