Alkylating Agent Additive for EDLC ESR Reduction
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Solution Overview
Problem
Current electric double-layer capacitors (EDLCs) face issues with nucleophilic species generation during operation, which react and impede their normal functioning, leading to increased equivalent series resistance (ESR) and capacitance loss.
Innovation Solution
Incorporating an alkylating or arylating agent additive in the EDLC electrolyte that scavenges nucleophilic species, such as tertiary amines and carboxylic acids, to prevent their reactive interference, thereby reducing ESR gain and enhancing capacitance retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If EDLCs operate normally, then power density is maintained at high levels, but nucleophilic species are generated that increase ESR and reduce capacitance
Solution Approach 1:
An alkylating or arylating agent additive is introduced as an intermediary substance in the electrolyte that reacts with nucleophilic species (such as tertiary amines and carboxylic acids) to neutralize them. This mediator prevents the harmful reactions between nucleophilic species and cell components, thereby maintaining high power density while improving capacitance retention and reducing ESR gain over time.
2Ease of operation
If nucleophilic species are present in the electrolyte, then the EDLC can function, but they react with cell components to impede normal functioning and increase ESR
Solution Approach 1:
The alkylating or arylating agent additive converts the harmful effect of nucleophilic species into a beneficial outcome by reacting with them to form stable, non-reactive products. The nucleophilic species that would normally cause ESR increase and capacitance loss are instead neutralized through alkylation or arylation reactions, transforming a harmful factor into a controlled chemical process that protects the cell.
3Ease of manufacture
If trace water is present in the electrolyte, then the EDLC can be manufactured, but hydroxide ions react with tetraethylammonium chloride to produce triethylamine that further reacts and impedes function
Solution Approach 1:
The alkylating or arylating agent additive is pre-introduced into the electrolyte during manufacturing to prevent future harmful reactions. This preliminary action ensures that when nucleophilic species are generated from trace water during normal operation, they are immediately neutralized by the pre-present additive, preventing the formation of harmful reaction products like triethylamine that would impede cell function.
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 addition of these agents effectively lowers ESR and improves capacitance stability, extending the life and performance of EDLCs by neutralizing reactive species generated during operation.
Implementation Method 1
an alkylating or arylating agent additive capable of scavenging nucleophilic species generated during operation of the EDLC
Data Source
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AI summary
Electric double layer capacitors (EDLCs) including an alkylating or arylating agent are described herein. The alkylating or arylating reagent comprises a compound of the formula I: R-X (I) wherein R and X are described herein.