Nonaqueous Electrolyte Additives for Low-Resistance Battery Cycling
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Solution Overview
Problem
Nonaqueous electrolyte solution batteries face challenges in maintaining low initial resistance and preventing resistance increases during high-temperature cycles, despite improvements from specific compounds with sulfonylimide structures.
Innovation Solution
Incorporating specific compounds represented by Formulas (1), (2), and (3) into the nonaqueous electrolyte solution, which form conductive films on electrodes, reducing direct contact with solvents and minimizing cation dissociation energy, thereby lowering initial resistance and stabilizing resistance during high-temperature cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If additives are used to prevent electrolyte decomposition at electrode surfaces, then cycle characteristics are improved, but the complexity of the electrolyte composition increases
Solution Approach 1:
The patent designs Component B (fluorinated cyclic carbonate compound) to perform multiple functions simultaneously: it acts as a cycle life improvement additive, a resistance stabilization agent during high-temperature cycles, and works synergistically with Component A to enhance overall battery performance. This multi-functionality reduces the need for multiple separate additives.
Solution Approach 2:
The patent introduces specific structural features (fluorinated cyclic carbonate structure) into Component B that provide targeted protection at the electrode-electrolyte interface. The fluorinated cyclic carbonate structure specifically addresses high-temperature resistance stability, while Component A addresses initial resistance, creating localized functional improvements without throughout the entire electrolyte bulk.
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 use of these compounds effectively reduces initial resistance and suppresses resistance increases in nonaqueous electrolyte solution batteries, especially during high-temperature operations, enhancing their performance and durability.
Implementation Method 1
form conductive films on electrodes
Implementation Method 2
minimizing cation dissociation energy
Data Source
AI summary
The present disclosure provides a nonaqueous electrolyte solution containing: (I) at least one selected from the group consisting of a compound represented by Formula (1) described in the specification, a compound represented by Formula (2) described in the specification, and a compound represented by Formula (3) described n the specification, and a nonaqueous electrolyte solution battery including at least a positive electrode, a negative electrode, a separator, and the above nonaqueous electrolyte solution.