Electrolytic Solution with Sulfonic Acid Ester for Battery Cycle Life
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Solution Overview
Problem
Existing electrolytic solutions for secondary batteries do not achieve sufficient battery characteristics, particularly in terms of cycle life and volume change, despite the addition of various additives.
Innovation Solution
A nonaqueous electrolytic solution comprising a sulfonic acid ester compound represented by formula (1) and a dicarboxylate ester compound represented by formula (2) or (3), which form films on electrode surfaces to suppress decomposition and enhance battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If various additives are added to electrolytic solutions to improve secondary battery performance, then battery characteristics are enhanced, but sufficient cycle life and volume stability are not achieved
Solution Approach 1:
The invention changes the chemical parameters of the electrolytic solution by introducing a specific compound (formula 1) with unique molecular structure containing heteroatoms (O, N, S) and specific functional groups. This compound modifies the SEI film composition and properties, leading to improved cycle life and volume stability while maintaining good battery characteristics.
Solution Approach 2:
The invention creates a composite electrolytic solution system that combines the new compound (formula 1) with conventional electrolyte components (lithium salt, cyclic carbonate, chain carbonate). This composite approach leverages the synergistic effects of the novel compound and traditional additives to achieve superior cycle life and volume stability compared to single-component systems.
2Reliability
If various additives are added to electrolytic solutions to improve secondary battery performance, then battery characteristics are enhanced, but volume change control is insufficient
Solution Approach 1:
The invention modifies the physical-chemical parameters of the electrolyte by introducing compound (formula 1) with specific molecular weight, functional groups, and heteroatom composition. These parameter changes result in formation of a more stable SEI film that effectively suppresses electrode expansion and contraction, thereby controlling volume change during charge-discharge cycles.
Solution Approach 2:
The compound (formula 1) acts as an intermediary substance that mediates between the electrolyte and electrode surfaces. It forms a protective interface layer that prevents direct contact between electrolyte and electrodes, reducing side reactions and volume expansion, thus controlling overall battery volume change during cycling.
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 solution provides a lithium secondary battery with excellent cycle characteristics, high capacity retention, and minimal volume change, effectively addressing the limitations of previous electrolytic solutions.
Implementation Method 1
a nonaqueous electrolytic solution comprising a sulfonic acid ester compound represented by formula (1) and a dicarboxylate ester compound represented by formula (2) or (3), which form films on electrode surfaces to suppress decomposition and enhance battery performance
Data Source
AI summary
The present invention relates to an electrolytic solution comprising a cyclic disulfonic acid ester represented by the specific formula and a cyclic dicarboxylic acid ester represented by the specific formula, and the secondary battery using the same. According to the present invention, the electrolytic solution which can improve a cycle characteristics in a secondary battery and a secondary battery using the same can be provided.