Carbonic Acid Ester Electrolyte for Secondary Battery Cyclability
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Solution Overview
Problem
The cyclability characteristic of secondary batteries remains insufficient despite various considerations in their development.
Innovation Solution
An electrolytic solution for secondary batteries is developed, incorporating a carbonic acid ester compound represented by Formula (1), which includes specific alkyl, alkoxy, hydroxyalkoxy, vinyl, vinyloxy, halogen, or hydroxyl groups, and hydrogen or halogen groups, forming a film on the negative electrode to reduce decomposition reactions during charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electrolytic solution includes carbonyloxy ester compound for high-temperature performance, then high-temperature lifetime performance improves, but cyclability characteristic remains insufficient
Solution Approach 1:
The patent creates a composite electrolytic solution system that combines carbonyloxy ester compounds (for high-temperature stability) with a specific chain carbonic acid ester compound (for cyclability improvement). This composite approach allows the electrolyte to simultaneously provide high-temperature lifetime performance through the carbonyloxy ester and superior cyclability through the chain carbonic acid ester that forms a stable SEI film, resolving the contradiction between these two performance aspects.
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 use of the carbonic acid ester compound in the electrolytic solution enhances the cyclability characteristic by forming a stable film that prevents discharge capacity decline, even after repeated charging and discharging, thereby improving the battery's performance.
Implementation Method 1
incorporating a carbonic acid ester compound represented by Formula (1), which includes specific alkyl, alkoxy, hydroxyalkoxy, vinyl, vinyloxy, halogen, or hydroxyl groups, and hydrogen or halogen groups, forming a film on the negative electrode to reduce decomposition reactions during charging and discharging
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution including a carbonic acid ester compound.