Rope-Shaped Supercapacitors with Braided Electrodes
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Solution Overview
Problem
Conventional supercapacitors face challenges with low volumetric and gravimetric energy densities due to limitations in electrode thickness, active material mass loading, and mechanical rigidity, which restrict their adaptability in compact and portable energy storage applications.
Innovation Solution
The development of a rope-shaped supercapacitor with filamentary anode and cathode electrodes formed into a braid or twist yarn structure, utilizing porous conductive rods with high surface area carbon materials like graphene and activated carbon, and a process that impregnates active materials and electrolytes into the pores of these rods, allowing for high active material loading and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional supercapacitors use rigid electrode structures to maintain structural integrity, then mechanical strength is improved, but flexibility and shape conformability deteriorate
Solution Approach 1:
The supercapacitor is divided into multiple thin electrode strips (e.g., 5-20 micrometers thick) that are individually flexible and can be bent without breaking. These segmented strips are then assembled into a complete supercapacitor device, allowing the final product to maintain both structural integrity and flexibility. The thin-strip architecture enables the supercapacitor to conform to curved surfaces while maintaining electrical functionality.
2Adaptability or versatility
If conventional supercapacitors use thin electrodes to maintain flexibility, then flexibility is improved, but volumetric energy density deteriorates
Solution Approach 1:
Multiple thin electrode strips are nested or stacked together in a layered configuration to form a complete supercapacitor. This nested arrangement allows the device to achieve higher volumetric energy density by packing more active material within a compact volume, while the individual thin strips maintain flexibility. The nested structure effectively combines the advantages of thin-film flexibility with the energy storage capacity of multiple layers.
3Quantity of substance
If conventional supercapacitors use low active material mass loading to maintain porosity, then porosity is improved, but gravimetric energy density deteriorates
Solution Approach 1:
The electrode strips utilize porous carbon materials (such as activated carbon, carbon nanotubes, or graphene-based materials) that provide high surface area and porosity for electrolyte penetration and ion transport. The porous structure enables efficient electrochemical reactions while maintaining a lightweight construction. The porosity is optimized to balance ion accessibility with active material density, achieving high gravimetric energy density without sacrificing electrochemical performance.
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 design achieves high volumetric and gravimetric energy densities while providing mechanical flexibility and shape conformability, overcoming the limitations of conventional supercapacitors in terms of energy storage and adaptability.
Implementation Method 1
utilizing porous conductive rods with high surface area carbon materials like graphene and activated carbon
Implementation Method 2
impregnates active materials and electrolytes into the pores of these rods
Implementation Method 3
a process that impregnates active materials and electrolytes into the pores of these rods
Implementation Method 4
The high volumetric capacitance density of an EC relative to conventional capacitors (10 to 100 times greater than conventional capacitors) derives from using porous electrodes to create a large effective 'plate area' and from storing energy in the diffuse double layer
Implementation Method 5
rope-shaped supercapacitor with filamentary anode and cathode electrodes formed into a braid or twist yarn structure
Data Source
AI summary
Provided is a process for producing a rope-shaped supercapacitor comprising: (a) impregnating a first mixture of a first electrode active material (e.g. activated carbon or isolated graphene sheets) and a first electrolyte into pores of a first porous rod to form a first electrode; (b) encasing a porous separator around the first electrode to form a separator-protected first electrode; (c) impregnating a second mixture of a second electrode active material and a second electrolyte into pores of a second conductive porous rod to form a second electrode; (d) combining the separator-protected first electrode and second electrode form a braid or twist yarn; and (e) wrapping or encasing a protective sheath around the braid or yarn to form the supercapacitor.