Corrugated Carbon Network Electrodes for Fast-Charging Micro-Supercapacitors
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Solution Overview
Problem
Current carbon-based materials for electrochemical capacitors (ECs) face limitations in achieving high power and energy densities due to restacking of carbon sheets during processing, leading to low specific capacitance and charge/discharge rates, and existing methods for producing high-quality carbon electrodes are costly and require expensive equipment.
Innovation Solution
An interconnected corrugated carbon-based network (ICCN) is created using a low-cost process involving laser reduction of graphite oxide (GO) films, allowing for high surface area and tunable electrical conductivity without the need for reducing agents or expensive equipment, using a common infrared laser and direct-to-disc labeling technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carbon-based materials are used for EC electrodes, then manufacturing cost is reduced, but specific capacitance and charge/discharge rates remain low due to restacking of carbon sheets
Solution Approach 1:
The patent introduces corrugation (curvature) into the carbon sheets to prevent restacking. The corrugated structure creates physical separation between sheets while maintaining high surface area, directly addressing the restacking problem that limits specific capacitance in conventional flat carbon-based EC electrodes
Solution Approach 2:
The invention transitions from flat two-dimensional carbon sheets to three-dimensional corrugated structures. This dimensional change increases the surface area available for charge storage and prevents sheet-to-sheet contact, thereby improving specific capacitance without requiring expensive materials
2Quantity of substance
If carbon sheets are processed to increase surface area, then energy density improves, but charge/discharge rates decrease due to slower ion transport
Solution Approach 1:
The corrugated structure creates a three-dimensional architecture with enhanced ion transport pathways. The curved surfaces and increased porosity allow electrolyte penetration throughout the electrode volume, enabling fast charge/discharge rates while maintaining high surface area for energy storage
Solution Approach 2:
The invention utilizes the porous nature of corrugated carbon structures to facilitate rapid ion diffusion. The interconnected pores and channels created by corrugation enable efficient ion transport across the entire electrode, simultaneously achieving high surface area and fast charge/discharge kinetics
3Reliability
If expensive reducing agents and equipment are used to produce high-quality carbon electrodes, then electrical conductivity improves, but manufacturing cost increases
Solution Approach 1:
The patent employs a self-service approach where the carbonization process itself generates the conductive carbon structure without requiring expensive external reducing agents. The controlled carbonization of precursor materials directly produces the corrugated carbon sheets with inherent electrical conductivity, eliminating the need for costly reduction steps
Solution Approach 2:
The invention uses inexpensive, readily available precursor materials that can be easily carbonized. These disposable precursors are transformed into durable conductive carbon electrodes through a simple thermal process, avoiding the need for expensive reducing agents and specialized equipment
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 ICCN achieves high surface area and electrical conductivity, enabling high power and energy densities while maintaining mechanical robustness, with improved charge/discharge rates and cycling stability, suitable for flexible electronic devices and energy storage applications.
Implementation Method 1
directing a light beam across the carbon-based oxide film in a predetermined pattern... generating a light beam having a power density sufficient to reduce portions of the carbon-based oxide film to an ICCN
Implementation Method 2
light beam having a power density sufficient to reduce portions of the carbon-based oxide film
Data Source
AI summary
Capacitors having electrodes made of interconnected corrugated carbon-based networks (ICCNs) are disclosed. The ICCN electrodes have properties that include high surface area and high electrical conductivity. Moreover, the electrodes are fabricated into an interdigital planar geometry with dimensions that range down to a sub-micron scale. As such, micro-supercapacitors employing ICCN electrodes are fabricated on flexible substrates for realizing flexible electronics and on-chip applications that can be integrated with micro-electromechanical systems (MEMS) technology and complementary metal oxide semiconductor technology in a single chip. In addition, capacitors fabricated of ICCN electrodes that sandwich an ion porous separator realize relatively thin and flexible supercapacitors that provide compact and lightweight yet high density energy storage for scalable applications.