Cyclic Sulfonic Ester Precursors for Stable Li-Ion SEI Formation
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Solution Overview
Problem
Current nonaqueous electrolyte additives for lithium secondary batteries, such as 1,3-propane sultone and 1,4-butane sultone, face issues related to toxicity, gas production, and stability, necessitating the development of a cyclic sulfonic acid ester derivative compound that can form a stable electrode-electrolyte interface at high temperatures and improve battery life.
Innovation Solution
A compound represented by Formula I, which is a precursor for a cyclic sulfonic acid ester derivative, is synthesized through a method involving reactions with sodium metabisulfite, thionyl halide, and hydrolysis to introduce a derivative at the gamma or delta position of 1,3-propane or 1,4-butane sultone, facilitating the formation of a stable SEI layer in lithium secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 1,3-propane sultone or 1,4-butane sultone is used as nonaqueous electrolyte additive, then the battery can operate, but toxic issues and gas production occur
Solution Approach 1:
The patent extracts and removes the harmful sultone functional group from the molecular structure, replacing it with a sulfonic acid ester derivative structure that maintains the desired electrochemical performance while eliminating toxicity and gas production issues
Solution Approach 2:
The invention creates a composite molecular structure combining the beneficial cyclic ester framework with a sulfonic acid ester group, achieving a material that provides both operational reliability and environmental safety
2Reliability
If conventional cyclic sulfonic acid ester derivatives are used, then battery operation is achieved, but stability and life characteristics are insufficient
Solution Approach 1:
The patent introduces specific substituent groups at designated positions (gamma or delta position) of the cyclic sulfonic acid ester derivative structure, creating local structural modifications that enhance overall stability and battery life characteristics
Solution Approach 2:
The invention modifies molecular parameters by changing the substituent groups and their positions, thereby altering the electrochemical properties to achieve improved stability and extended battery operational life
3Reliability
If derivative introduction at gamma or delta position is attempted, then improved stability is achieved, but preparation complexity increases
Solution Approach 1:
The patent employs preliminary protection strategies where specific positions are protected or activated in advance, allowing for controlled and simplified derivative introduction at the desired gamma or delta positions without requiring complex multi-step synthesis procedures
Solution Approach 2:
The invention utilizes intermediary compounds or reagents that facilitate the selective introduction of derivatives at specific positions, acting as mediators that simplify the overall synthesis process while achieving the desired structural modifications
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 proposed solution enables the stable introduction of a derivative at the carbon position beside oxygen in the ring structure of cyclic sulfonic acid ester compounds, enhancing the stability and life characteristics of lithium secondary batteries by forming a thin and stable SEI layer when used in nonaqueous electrolytes.
Implementation Method 1
reacting a compound represented by Formula 1 with sodium metabisulfite or sodium hydrogen sulfite to prepare a compound represented by Formula 2
Implementation Method 2
reacting the compound represented by Formula 2 with thionyl halide to prepare a compound represented by Formula 3
Implementation Method 3
a step of hydrolyzing the compound represented by Formula 3 to prepare the compound represented by Formula I
Data Source
AI summary
Provided is a precursor compound of Formula I used for preparing a cyclic sulfonic acid ester derivative compound, and a method for preparing same,wherein all the variables are described herein.