Halogenated Alkyl Electrolyte Suppresses Gas in Lithium Ion Batteries
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Solution Overview
Problem
Lithium ion secondary batteries face challenges in high-temperature storage, where they are prone to gas generation and experience capacity retention issues.
Innovation Solution
An electrolytic solution containing specific halogenated alkyl groups, lithium salts, and cyclic dicarbonyl compounds, which are formulated to minimize gas generation and maintain capacity even under high-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic solutions are used in lithium ion secondary batteries, then the batteries can operate at high temperatures, but gas generation occurs and capacity retention deteriorates during high-temperature storage
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolytic solution by introducing specific compounds with formula (1) containing halogenated alkyl groups, lithium salts, and cyclic dicarbonyl compounds. These parameter changes in electrolyte composition suppress gas generation reactions and improve capacity retention during high-temperature storage, directly resolving the technical contradiction between reliability and harmful gas generation.
Solution Approach 2:
The patent employs a composite electrolytic solution formulation combining multiple components: compound (1) with halogenated alkyl groups, lithium salts, cyclic dicarbonyl compounds, and other additives. This composite material approach creates synergistic effects where each component contributes to suppressing gas generation and maintaining capacity retention, effectively resolving the contradiction between battery reliability and gas generation during high-temperature storage.
2Reliability
If the electrolytic solution contains halogenated alkyl groups, lithium salts, and cyclic dicarbonyl compounds, then capacity retention improves, but the complexity of the electrolyte formulation increases
Solution Approach 1:
The patent optimizes concentration parameters of each electrolyte component to achieve effective capacity retention. By carefully controlling the amounts of compound (1), lithium salts, and cyclic dicarbonyl compounds within specific ranges, the formulation achieves desired performance while managing complexity through parameter optimization rather than simply adding more components.
Solution Approach 2:
The patent designs compound (1) with multi-functional properties that simultaneously provide several benefits: suppressing gas generation, improving capacity retention, and maintaining electrochemical stability. This multi-functionality reduces the need for multiple separate additives, thereby managing formulation complexity while achieving reliable performance.
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 electrolytic solution effectively reduces gas generation and ensures high capacity retention in lithium ion secondary batteries during high-temperature storage.
Implementation Method 1
an electrolytic solution containing specific halogenated alkyl groups, lithium salts, and cyclic dicarbonyl compounds, which are formulated to minimize gas generation and maintain capacity even under high-temperature conditions
Implementation Method 2
The electrolytic solution preferably further contains at least one lithium salt (X) selected from the group consisting of: a compound (3) represented by formula (3)
Data Source
AI summary
The present invention provides an electrolytic solution capable of providing an electrochemical device (e.g., a lithium ion secondary battery) or a module that is less likely to generate gas even in high-temperature storage and has high capacity retention even after high-temperature storage. The present invention relates to an electrolytic solution which may contain a compound represented by Y21R21C-CY22R22 wherein R21 and R22 may be the same as or different from each other, and are each H, an alkyl group, or a halogenated alkyl group; Y21 and Y22 may be the same as or different from each other, and are each - OR23 or a halogen atom; and R23 is H, an alkyl group, or a halogenated alkyl group.