Non-Aqueous Electrolyte Composition for Short-Circuit Heat Reduction
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Solution Overview
Problem
Lithium secondary batteries face issues with heat generation during short-circuit and performance deterioration, which existing non-aqueous electrolytic solutions fail to adequately address.
Innovation Solution
A non-aqueous electrolytic solution comprising a compound represented by Formula (P) and a sulfuric ester compound, with specific ratios and types of these components, is used to reduce heat generation during short-circuit while maintaining battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-aqueous electrolytic solution containing phosphoric ester compounds (such as TBP or TPP) is used to achieve flame-retarding effect and high temperature charge-discharge cycle characteristics, then the flame-retarding performance is improved, but the heat generation rate at the time of short-circuit increases
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolytic solution by introducing a specific sulfuric ester compound (cyclic structure with formula (C)) in combination with phosphoric ester compound (P). This parameter change modifies the electrolyte's chemical properties to simultaneously achieve flame-retarding effect and reduced heat generation during short-circuit, resolving the contradiction between safety and thermal stability.
Solution Approach 2:
The patent creates a composite electrolytic solution system by combining phosphoric ester compound (P) with sulfuric ester compound (C) in specific ratios. This composite approach leverages the flame-retarding properties of phosphoric ester while the sulfuric ester component suppresses heat generation during short-circuit, achieving both benefits simultaneously.
2Reliability
If conventional non-aqueous electrolytic solutions are used to maintain battery performance, then the battery can operate normally, but performance deterioration occurs during storage at high temperatures
Solution Approach 1:
The sulfuric ester compound (C) acts as an intermediary substance that mediates between the phosphoric ester compound (P) and the battery components during high-temperature storage. It forms protective films on electrode surfaces, preventing direct harmful interactions and reducing performance deterioration while maintaining normal battery operation.
Solution Approach 2:
The patent modifies the electrolytic solution composition by adding sulfuric ester compound (C) with specific structural parameters (cyclic structure, specific molecular weight range). This parameter change enhances the solution's thermal stability and its ability to protect battery components during high-temperature storage, extending the battery's service life.
Data Source
AI summary
A non-aqueous electrolytic solution for a battery includes a compound represented by Formula (P) and a sulfuric ester compound. In Formula (P), each of R1 to R4 independently represents an alkyl group having from 1 to 6 carbon atoms or an aryl group having from 6 to 12 carbon atoms, L1 represents an alkylene group having from 1 to 6 carbon atoms or an arylene group having from 6 to 12 carbon atoms, and n represents an integer from 0 to 2. In a case in which n is 2, two R4s may be the same as or different from each other, and two L1s may be the same as or different from each other.