Electrochemical Capacitor with Non-Aqueous Electrolyte
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Solution Overview
Problem
Conventional electrochemical capacitors have low energy and power densities due to limitations in electrolyte stability and electrode conductivity, particularly with MnO2 electrodes, which restrict high-temperature operation and rapid redox reactions.
Innovation Solution
A non-aqueous electrolyte system using organic salts with acylamino groups and lithium salts, combined with nanostructured metal oxides deposited on 3D porous metal or carbonaceous materials, enhancing electrolyte penetration and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional aqueous electrolyte is used, then the capacitor cell voltage is limited to 1V, but the electrolyte provides good ionic conductivity
Solution Approach 1:
The patent changes the fundamental parameter of electrolyte composition from aqueous to non-aqueous (ionic liquid) system, enabling operation at higher voltages (2.5-3.0V vs 1V) while maintaining stability through the unique properties of ionic liquids that resist decomposition at elevated potentials
Solution Approach 2:
The patent creates a composite electrolyte system combining ionic liquid with specific metal oxide nanoparticles (MnO2, V2O5, MoO3) to achieve both high voltage stability and enhanced ionic conductivity, where the composite structure provides synergistic effects
2Temperature
If non-aqueous electrolytes such as organic solvents are used, then the cell can be operated at high temperatures, but the electrolyte is volatile, flammable, and thermally unstable
Solution Approach 1:
The patent employs ionic liquids as electrolytes, which create an inert chemical environment that is non-flammable and thermally stable, eliminating the safety hazards associated with conventional organic solvent-based electrolytes while enabling high-temperature operation
Solution Approach 2:
The patent uses metal oxide nanoparticles (MnO2, V2O5, MoO3) as electrode materials that are abundant, low-cost, and environmentally benign, replacing expensive or hazardous materials while providing sufficient operational lifetime
3Quantity of substance
If MnO2 films are used as electrode, then the energy density is high, but the electronic and ionic conductivity is low, limiting redox reaction rate
Solution Approach 1:
The patent utilizes porous metal foam substrates and porous metal oxide structures that provide high surface area to volume ratios, enabling increased energy density while the porous architecture facilitates rapid ion transport, thereby resolving the conductivity limitation
Solution Approach 2:
The patent transitions from conventional 2D planar electrodes to 3D hierarchical structures (metal foam + nanoparticle composites), creating multiple transport dimensions for ions and electrons that simultaneously enhance both energy capacity and reaction kinetics
4Stability of the object's composition
If cations adsorb only on electrode surface, then the electrode structure is maintained, but the penetration into bulk material is insufficient, reducing redox reaction efficiency
Solution Approach 1:
The patent employs porous metal oxide structures with controlled pore sizes and distributions that allow electrolyte penetration deep into the bulk material while maintaining structural integrity, enabling both high ion insertion rates and structural stability during cycling
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 solution achieves significantly higher energy and power densities, with superior cycling performance and expanded operating voltage, surpassing existing technologies in electrochemical energy storage systems.
Implementation Method 1
a small variation in the Mn oxidation state implies that a low percentage of Mn in the structures has undergone reduction-oxidation (redox) reaction
Implementation Method 2
a low rate of ion insertion
Implementation Method 3
a new electrode with properties that enhance penetration of an electrolyte
Implementation Method 4
The positive electrode and the negative electrode are immersed in the non-aqueous electrolyte
Data Source
AI summary
An electrochemical capacitor includes a positive electrode, a negative electrode disposed proximally to the positive electrode, and a non-aqueous electrolyte, wherein the positive electrode and the negative electrode are immersed in the non-aqueous electrolyte, and a case is presented in the energy storage system to accommodate the non-aqueous electrolyte, the positive electrode, and the negative electrode. The positive electrode has a porous matrix having a plurality of micrometer sized pores and nanostructured metal oxides, wherein the porous matrix is a 3-dimensional (3D) mesoporous metal or a 3D open-structured carbonaceous material, and the nanostructured metal oxides are coated inside the plurality of pores of the porous matrix. The non-aqueous electrolyte includes organic compounds having at least one acylamino group and lithium salts characterized as LiX, wherein Li is lithium and X comprises SCN−; the organic compounds are cyclic compounds; and the cyclic compounds comprise 2-oxazolidinone, ethyleneurea, or the combination thereof.