Electrolyte additives for capacitor-assisted battery
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Solution Overview
Problem
Capacitor-assisted batteries face challenges with low energy densities and susceptibility to undesirable side reactions due to large surface area and contact with electrolyte solvents, limiting their performance in applications requiring both high power and energy capabilities.
Innovation Solution
An electrolyte system for capacitor-assisted batteries incorporating 3-trimethylsilylphenylboronic acid (TMSPB) and succinic anhydride (SA) additives, with specific coatings on electroactive and capacitor materials to enhance lithium-ion conductivity and stability, along with a lithium salt concentration of 0.6 M to 2.0 M in a solvent mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If capacitor-assisted materials are used to supply crank current during engine startup, then power capabilities are enhanced, but energy densities decrease due to increased electrolyte requirements
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing specific additives (TMSPB and SA) that modify the electrolyte's interaction with capacitor materials. This allows the system to maintain high power capabilities while reducing electrolyte consumption, thereby improving energy density.
Solution Approach 2:
The patent creates a composite electrolyte system combining traditional lithium salt components with novel organic additives (TMSPB and SA). This composite approach enables the electrolyte to simultaneously support high power delivery and reduce overall electrolyte requirements in capacitor-assisted batteries.
2Power
If capacitor-assisted materials with large surface area are used, then power density is improved, but susceptibility to side reactions increases
Solution Approach 1:
The patent introduces TMSPB and SA additives as intermediary substances that mediate between the electrolyte solvent and capacitor-assisted materials. These additives form protective interfacial layers that prevent direct harmful interactions while allowing beneficial lithium-ion transport, thus suppressing side reactions like gassing.
Solution Approach 2:
The patent converts the potentially harmful large surface area of capacitor materials into a benefit by using the additives to form protective films that increase surface stability. The large surface area that initially caused increased side reactions now provides enhanced reaction sites for the protective film formation, which then prevents further harmful reactions.
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 electrolyte system improves energy density and reduces side reactions, enhancing the overall performance and stability of capacitor-assisted batteries.
Implementation Method 1
The 3-trimethylsilylphenylboronic acid (TMSPB) and the succinic anhydride (SA) may together define a first coating on the electroactive material and a second coating on the capacitor material
Implementation Method 2
The electrolyte system may include a lithium-ion conducting component
Data Source
AI summary
A capacitor-assisted battery includes an electrolyte having a lithium-ion conducting component and one or more additives. The one or more additives include a first additive that includes 3-trimethylsilylphenylboronic acid and a second additive that includes succinic anhydride. The capacitor-assisted battery includes an electrode having an electroactive material and a capacitor material. The electroactive material has a first coating defined thereon, and the capacitor material has a second coating defined thereon. The first and second coatings are defined by the first and second additives. The first coating is a substantially continuous coating that covers greater than or equal to about 80% of a total exposed surface area of the electroactive material. The second coating is a discontinuous coating covers greater than or equal to about 20% to less than or equal to about 80% of a total exposed surface area of capacitor material.