Nonaqueous Electrolyte Additives for Lower Battery Initial Resistance
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Solution Overview
Problem
Existing nonaqueous electrolyte solutions for batteries exhibit increased internal resistance and lack significant improvement in initial input/output characteristics when containing isocyanuric acid derivatives.
Innovation Solution
Incorporation of specific compounds represented by general formulas (1) and (2) into the nonaqueous electrolyte solution, which form a film on electrode surfaces to reduce direct contact and cation dissociation energy, thereby lowering initial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isocyanuric acid derivatives (compounds with alkyl groups substituted with fluorosulfonyl group or vinylsulfonyl groups bonded to three nitrogen atoms of an isocyanurate ring) are added to the nonaqueous electrolyte solution, then durability such as cycle characteristics and high-temperature storage characteristics is improved, but initial resistance value increases and initial input/output characteristic shows no or small improvement
Solution Approach 1:
The patent changes the chemical structure parameters of the isocyanuric acid derivative by replacing alkyl groups or vinyl groups with fluorinated alkyl groups (containing CF3, CF2, or CHF2 groups). This structural modification alters the electrochemical properties of the additive, enabling it to form electrode surface films with different resistance characteristics while maintaining the durability-improving effects
Solution Approach 2:
The patent combines fluorinated isocyanuric acid derivatives with specific electrolyte solvents (cyclic carbonates, chain carbonates, cyclic carboxylic acid esters) and lithium salts to create a composite electrolyte system. This composite approach synergistically improves both initial resistance and durability, as the fluorinated additive works cooperatively with the solvent system to form optimized electrode interfaces
2Stability of the object's composition
If conventional isocyanuric acid derivatives are used to prevent deterioration due to decomposition of the nonaqueous electrolyte solution at electrode surfaces, then storage stability is improved, but internal resistance increases
Solution Approach 1:
The patent modifies the physical and chemical parameters of the isocyanuric acid derivative by introducing fluorinated alkyl groups with specific carbon chain lengths (1-4 carbons) and fluorine substitution patterns. These parameter changes alter the film-forming behavior and resistance characteristics while preserving the protective function against electrolyte decomposition
Solution Approach 2:
The patent creates a modified version (fluorinated derivative) that copies the core protective function of the conventional isocyanuric acid derivative while improving the resistance characteristic. The fluorinated compound replicates the film-forming protection mechanism but with optimized electrical properties
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 compounds effectively reduce the initial resistance of nonaqueous electrolyte batteries, enhancing their performance and stability.
Implementation Method 1
which form a film on electrode surfaces to reduce direct contact and cation dissociation energy, thereby lowering initial resistance
Data Source
AI summary
The present disclosure provides a nonaqueous electrolyte solution containing at least one selected from the group consisting of a compound represented by the following general formula (1) and a compound represented by the following general formula (2): and a nonaqueous electrolyte solution battery including at least a positive electrode, a negative electrode, a separator, and the nonaqueous electrolyte solution. In the general formula (1), R1 to R3 represent groups which may be the same or different and at least one of R1 to R3 represents a -SO2F group. In the general formula (2), R4 to R6 represent groups which may be the same or different and at least one of R4 to R6 represents a -SO2F group.