Triptycene Arylene Diimide Frameworks for Stable Li-Ion Electrodes
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Solution Overview
Problem
Current lithium ion batteries rely on heavy metals like cobalt for cathodes, which are costly, unsustainable, and sourced from politically unstable regions, and anode materials like graphite have low capacity and safety concerns due to dendrite formation, while new materials face challenges with volume expansion and cycling stability.
Innovation Solution
Development of triptycene-based electroactive materials with arylene diimide groups forming a crosslinked network, providing high capacity and stability through specific molecular structures and production processes, suitable for use in lithium ion batteries and other energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If cobalt-based cathode materials are used, then high energy density is achieved, but cost and sustainability are worsened due to heavy metal usage and political supply chain issues
Solution Approach 1:
The patent changes the chemical composition parameters of cathode materials by using organic molecules with redox-active groups (perylenediimide, naphthalenediimide, anthraquinone) instead of cobalt-based compounds, maintaining electrochemical performance while eliminating heavy metal dependencies
Solution Approach 2:
The patent creates composite organic electrode materials combining triptycene frameworks with redox-active diimide groups, achieving both high energy density and sustainability through molecular-level composite design
2Ease of manufacture
If graphite anode materials are used, then manufacturing is simple, but capacity is limited to approximately 300 mAh g−1
Solution Approach 1:
The patent changes the anode material composition from graphite to organic compounds containing benzimidazole or triptycene groups, enabling lithium insertion at low potentials and achieving capacities exceeding 500 mAh g−1 while maintaining ease of organic synthesis manufacturing
3Quantity of substance
If silicon, germanium, or phosphorus anode materials are used, then theoretical capacity greater than 1000 mAh g−1 is achieved, but volume expansion greater than 300% occurs leading to low cycling stability
Solution Approach 1:
The patent employs organic molecular structures with inherent flexibility and adaptability that can accommodate lithium insertion/extraction without rigid structural constraints, preventing the severe volume expansion seen in silicon-based materials
Solution Approach 2:
The patent changes from inorganic materials with fixed rigid structures to organic materials whose molecular frameworks can dynamically adapt to lithium loading, maintaining structural integrity over 500 cycles while achieving high capacity
4Quantity of substance
If lithium metal anodes are used, then capacity of 3842 mAh g−1 is achieved, but dendrite formation occurs creating safety concerns
Solution Approach 1:
The patent uses organic anode materials that function as stable, non-metallic lithium hosts, avoiding the dendrite formation issues of lithium metal while maintaining high capacity through reversible lithium insertion into organic frameworks
Solution Approach 2:
The patent creates composite organic anode structures combining conductive frameworks with lithium-hosting groups, achieving safe alternative to lithium metal with capacities exceeding 500 mAh g−1 without dendrite formation
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 triptycene-based materials achieve high capacity retention over 500 cycles and offer a sustainable alternative to traditional battery components, addressing cost, sustainability, and safety issues by providing a stable energy storage solution.
Implementation Method 1
When a lithium ion battery is assembled using redox-active cathode materials such as perylene diimide triptycene framework material, a capacity of 75.9 mAh g−1 (78.7% of the theoretical value) may be obtained.
Implementation Method 2
these materials have challenges associated with the large volume expansion upon lithiation
Data Source
AI summary
The present disclosure relates to electroactive materials that are useful for secondary battery electrode materials and the secondary battery device including thereof. Further, the disclosure relates to cathode and anode materials obtained via the polymerization of triptycene-based organic molecules having one or more arylene diimide groups attached forming a crosslinked network.