Electrochemical Capacitor Electrolyte for Float-Charge Gas Suppression
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Solution Overview
Problem
Electrochemical capacitors degrade in performance during float charging due to electrolyte decomposition, leading to gas generation and degradation of floating characteristics.
Innovation Solution
Incorporating a lactone compound, such as γ-butyrolactone, with additives like siloxane and silyl fluoride compounds in the electrolyte to inhibit oxidative decomposition of the lactone compound, thereby reducing gas generation and improving floating characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If float charging is performed, then the electrochemical capacitor can maintain charged state, but electrolyte decomposition occurs leading to gas generation and performance degradation
Solution Approach 1:
A siloxane compound or silyl fluoride compound is introduced as an intermediary substance in the electrolyte. These compounds act as mediators that suppress the oxidative decomposition of the main electrolyte solvent (cyclic carbonate or chain carbonate), thereby preventing gas generation while maintaining the float charging function. The intermediary compounds react preferentially or inhibit the harmful oxidation reactions.
Solution Approach 2:
The harmful oxidative decomposition reaction is extracted or removed from the system by adding small amounts of siloxane or silyl fluoride compounds. These additives specifically target and eliminate the decomposition pathway that leads to gas generation, allowing the electrolyte to maintain stability during float charging without producing harmful gases.
2Productivity
If conventional electrolytes are used, then the electrochemical capacitor can operate, but performance degrades during float charging due to electrolyte decomposition
Solution Approach 1:
The chemical composition parameters of the electrolyte are changed by adding 0.01-5% by mass of siloxane or silyl fluoride compounds. This parameter change fundamentally alters the electrochemical stability of the electrolyte system, preventing decomposition during float charging while maintaining all operational functions. The additive concentration is optimized to achieve the best balance between stability and performance.
Solution Approach 2:
The electrolyte is formulated as a composite system combining the main solvent (cyclic carbonate or chain carbonate) with small amounts of siloxane or silyl fluoride compounds. This composite electrolyte structure leverages the beneficial properties of both components: the main solvent provides ionic conductivity and the siloxane/silyl fluoride additive provides oxidative stability, resulting in an electrolyte that maintains both operational function and reliability during float charging.
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 siloxane and silyl fluoride compounds in the electrolyte significantly suppresses gas generation during float charging, thereby inhibiting degradation and enhancing the electrochemical capacitor's floating characteristics.
Implementation Method 1
the electrolyte contains a lactone compound and an additive, and the additive is at least one selected from the group consisting of a siloxane compound and a silyl fluoride compound... inhibit oxidative decomposition of the lactone compound
Data Source
AI summary
An electrochemical capacitor includes a positive electrode, a negative electrode, and an electrolyte. The electrolyte contains a lactone compound and an additive. The additive is at least one selected from the group consisting of a siloxane compound and a silyl fluoride compound.