Hybrid Capacitor Redox Polymer In-Situ Formation
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Solution Overview
Problem
The traditional method of manufacturing hybrid capacitors with redox polymer modified positive electrodes requires additional equipment and time for polymer deposition, and risks damaging the polymer layer during assembly, leading to degraded electrochemical properties.
Innovation Solution
A method involving soaking a porous conductive material in a solution containing a metal complex to form a stacked redox polymer, followed by assembly and hermetic sealing with an electrolyte solution, where polymerization occurs during charging-discharging cycles, eliminating the need for separate polymer deposition and reducing process duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polymer deposition method is used to form redox polymer layer on positive electrode, then polymer layer can be formed, but additional equipment and time are required, and polymer layer may be damaged during assembly
Solution Approach 1:
The metal complex is pre-loaded into the porous electrode structure before assembly, so that polymerization occurs in-situ during charging-discharging cycles rather than requiring preliminary polymer deposition equipment and processes
Solution Approach 2:
The capacitor performs its normal charging-discharging function while simultaneously forming the redox polymer layer through in-situ polymerization, eliminating the need for separate polymer deposition equipment and processes
2Reliability
If traditional polymer deposition method is used, then polymer layer can be formed, but process duration is extended
Solution Approach 1:
The polymerization process is merged with the normal charging-discharging cycling process of the capacitor, so that forming the redox polymer layer does not require separate time but occurs concurrently with operational conditioning
Solution Approach 2:
The metal complex is pre-loaded into the electrode before assembly, enabling immediate in-situ polymerization during first charging-discharging cycles rather than requiring separate polymer deposition time
3Ease of manufacture
If in-situ polymerization is used during charging-discharging cycles, then manufacturing complexity is reduced and polymer properties are preserved, but polymer layer formation must occur within sealed capacitor
Solution Approach 1:
The porous structure of the electrode material is utilized to load and retain the metal complex within the electrode matrix, ensuring sufficient concentration is maintained for effective in-situ polymerization during charging-discharging cycles
Solution Approach 2:
The concentration of metal complex in the electrolyte is optimized to balance between providing sufficient precursor for polymerization and avoiding excessive concentration that would complicate the manufacturing process
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 method reduces the complexity and duration of hybrid capacitor manufacturing, preserves polymer properties, and avoids the need for special equipment, while forming an energy-accumulating redox polymer layer on the positive electrode within the sealed capacitor.
Implementation Method 1
The porous electrically conductive material is saturated by soaking it in a solution containing a metal complex
Implementation Method 2
a layer of energy-accumulating redox polymer is formed on a substrate of the positive electrode as the hybrid capacitor is conditioned
Data Source
AI summary
The present invention relates to methods of manufacturing an electrochemical energy storage device, such as a hybrid capacitor. The method comprises saturating a porous electrically conductive material in a solution comprising an organic solvent and a metal complex or a mixture of metal complexes; assembling a capacitor comprising the positive electrode made of porous electrically conductive material saturated with a metal complex, a negative electrode, and a separator in a casing; introducing the electrolyte solution into the casing; sealing the casing; and subsequent charge-discharge cycling of the capacitor. The charge-discharge cycling deposits a layer of an energy-accumulating redox polymer on the positive electrode. The electrolyte solution for filling the hybrid capacitor contains an organic solvent, a metal complex, and substances soluble to a concentration of no less than 0.01 mol/L and containing ions that are electrochemically inactive within the range of potentials between −3.0 V to +1.5 V.