Rope-Shape Supercapacitor Braid Design
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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, particularly with graphene-based electrodes, which struggle with re-stacking and require high binder resin usage, leading to reduced specific surface area and capacitance.
Innovation Solution
A rope-shape supercapacitor design featuring filamentary anode and cathode electrodes combined in a braid or twist yarn structure, with porous separators and high surface area carbon materials like graphene, allowing for increased active material loading and accessibility of electrolyte, eliminating the need for binder resin and enabling flexible, shape-conformable energy storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional slurry coating procedure is used to increase electrode thickness, then active material mass loading increases, but electrode becomes brittle and structural integrity deteriorates
Solution Approach 1:
The patent employs porous conductive rods as electrode substrates with controlled porosity (50-90%) to maintain structural integrity while accommodating high active material loading. The porous structure provides mechanical flexibility and prevents brittleness even at thick electrode configurations, resolving the contradiction between mass loading and structural strength.
Solution Approach 2:
The patent creates composite electrode structures by impregnating porous conductive rods with active material-electrolyte mixtures. This composite approach combines the mechanical strength of the porous rod framework with the electrochemical functionality of the active material, enabling thick electrodes without sacrificing structural integrity.
2Strength
If binder resin is used to maintain electrode structural integrity, then mechanical strength improves, but specific surface area and capacitance decrease
Solution Approach 1:
The patent eliminates binder resin from the electrode structure entirely, extracting this non-functional component that blocked active material surface area. The porous conductive rod framework alone provides sufficient structural integrity, allowing 100% of the electrode surface to be electrochemically active, thus resolving the contradiction between strength and surface area.
3Stability of the object's composition
If conventional rigid supercapacitor design is used, then structural stability is maintained, but adaptability to confined spaces and wearable devices is reduced
Solution Approach 1:
The patent transforms the rigid supercapacitor structure into a flexible, dynamic configuration using porous conductive rods that can bend and conform to various shapes while maintaining structural stability. The rope-shape design with flexible porous framework allows the supercapacitor to adapt to confined spaces and wearable applications without compromising structural integrity.
Solution Approach 2:
The patent employs flexible porous conductive rod structures as the fundamental building blocks, replacing rigid electrode foils. These flexible porous structures maintain their integrity while allowing bending and shaping, enabling the supercapacitor to conform to various geometries for wearable and confined space applications.
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 rope-shape supercapacitor achieves high volumetric and gravimetric energy densities while maintaining flexibility and conformability, overcoming the limitations of traditional supercapacitors by maximizing active material utilization and minimizing re-stacking issues.
Implementation Method 1
A polarized double layer is formed at electrode-electrolyte interfaces providing high capacitance. This implies that the specific capacitance of a supercapacitor is directly proportional to the specific surface area of the electrode material.
Implementation Method 2
This surface area must be accessible by electrolyte and the resulting interfacial zones must be sufficiently large to accommodate the so-called electric double-layer charges.
Data Source
AI summary
Provided is a rope-shaped supercapacitor having a first and second conductive porous electrode in a rod shape, where the pores are filled with an electrolyte and an electrode active material. The pores of the first electrode may contain activated carbon or isolated graphene sheets. A porous separator encases the first electrode to form a separator-protected electrode. The two electrodes are combined to form a braid or twist yarn, and a protective sheath wrapps around or encases the braid or twist yarn.