Nonaqueous Electrolyte Additive Film for High-Temperature Battery Cycling
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Solution Overview
Problem
Existing nonaqueous electrolyte solutions in batteries face challenges in improving high-temperature cycle characteristics and suppressing resistance increases, despite the use of sulfonic acids and sulfonates as additives.
Innovation Solution
A nonaqueous electrolyte solution containing a compound represented by Formula (1), a solute, and a nonaqueous organic solvent, which forms a film on the electrode surface to prevent direct contact and reduce cation dissociation energy, thereby enhancing high-temperature cycle characteristics and suppressing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfonic acids and sulfonates are added to improve cycle characteristics, then high-temperature storage characteristics improve, but resistance increase is not sufficiently suppressed
Solution Approach 1:
The patent uses a composite additive system comprising multiple components: a hydroxyalkyl sulfonate (Component 1), a cyclic carbonate (Component 2), and a chain carbonate (Component 3). This composite approach creates synergistic effects where the hydroxyalkyl sulfonate forms protective films on electrode surfaces, the cyclic carbonate enhances film stability, and the chain carbonate improves ionic conductivity, collectively addressing both cycle characteristics and resistance suppression
Solution Approach 2:
The patent optimizes specific parameter ranges for each additive component to achieve the desired balance. The hydroxyalkyl sulfonate is used at 0.01-5% by mass, cyclic carbonate at 5-50% by volume, and chain carbonate at 50-99% by volume. These parameter optimizations ensure sufficient film formation for cycle stability while maintaining low resistance through proper ionic conductivity
2Reliability
If film formation on electrode surface is enhanced to prevent decomposition, then cycle characteristics improve, but ionic conductivity may be reduced
Solution Approach 1:
The patent applies local quality by using the hydroxyalkyl sulfonate to form protective films specifically at the electrode-solution interface where decomposition occurs, while the bulk electrolyte maintains high ionic conductivity through the chain carbonate component. This localized film formation protects electrodes without impeding overall ion transport in the electrolyte bulk
Solution Approach 2:
The cyclic and chain carbonates act as intermediary substances that mediate between the electrode surface and the bulk electrolyte. They facilitate the formation of stable interfacial films that prevent decomposition while maintaining pathways for ionic conduction, thus bridging the protective function and conductive function
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 improves high-temperature cycle characteristics and suppresses resistance increases in nonaqueous electrolyte batteries, while maintaining effective ionic conductivity.
Implementation Method 1
forms a film on the electrode surface to prevent direct contact
Implementation Method 2
maintaining effective ionic conductivity
Data Source
AI summary
Provided are a nonaqueous electrolyte solution containing: (I) a compound represented by Formula (1) described in the specification (for example, a compound represented by the following Formula (a-1)); (II) a solute; and (III) a nonaqueous organic solvent, a nonaqueous electrolyte solution and a nonaqueous electrolyte solution battery that can improve high-temperature cycle characteristics and suppress an increase in battery resistance by using the compound represented by Formula (1) and an additive for nonaqueous electrolyte solution, and a compound and an additive for nonaqueous electrolyte solution that can be suitably used in the nonaqueous electrolyte solution described above.