Secondary Battery Electrolyte Salt for Ion Conductivity and Cyclability
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Solution Overview
Problem
Current secondary battery configurations do not achieve sufficient battery characteristics, such as high ion conductivity and cyclability, due to limitations in electrolyte salts and decomposition reactions.
Innovation Solution
An electrolytic solution for secondary batteries incorporating an imide anion with specific fluorinated groups and light metal ions, which forms a high-quality film on electrodes to suppress decomposition and enhance cation migration, is used, along with additional electrolyte salts and additives to improve ion conductivity and cyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte salts are used, then the battery can operate, but ion conductivity and cyclability are insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the electrolyte salt by introducing specific imide anions with fluorinated alkyl groups and sulfonyl/imide functional groups. This structural modification optimizes the balance between ion conductivity and cyclability, allowing the battery to maintain high performance over extended charge-discharge cycles while preserving adequate ion transport capability.
Solution Approach 2:
The patent employs a composite electrolyte system combining the novel imide anion-containing electrolyte salt with specific solvents (cyclic carbonates, chain carbonates, and cyclic carboxylic acid esters). This composite approach creates synergistic effects where the electrolyte salt provides structural stability and the solvent system ensures ion mobility, collectively improving both cyclability and ion conductivity.
2Duration of action of stationary object
If electrolyte decomposition reactions occur, then battery operation continues, but battery characteristic deteriorates
Solution Approach 1:
The patent converts the potential harmful decomposition reactions into beneficial effects by designing the imide anion structure to preferentially undergo controlled decomposition that forms stable protective films on electrode surfaces. These films, containing fluorinated groups and sulfonyl/imide moieties, act as barriers that prevent further electrolyte decomposition while maintaining ion transport, thus extending battery operation duration without sacrificing reliability.
Solution Approach 2:
The fluorinated alkyl groups and sulfonyl/imide functional groups in the electrolyte salt create an electrochemically inert interface between the electrolyte and electrodes. This inert protective layer reduces parasitic reactions and stabilizes the electrolyte environment, allowing the battery to operate for extended periods while maintaining consistent performance characteristics.
3Productivity
If cation migration is enhanced, then battery performance improves, but decomposition reactions increase
Solution Approach 1:
The patent applies local quality modification by concentrating the protective function in specific molecular regions of the imide anion. The fluorinated alkyl groups and sulfonyl/imide functional groups are positioned to preferentially interact with electrode surfaces, creating localized protective zones that enable enhanced cation migration near the electrodes while preventing decomposition reactions at the same locations. This spatial separation of functions allows improved performance without increased decomposition.
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 electrolytic solution significantly improves battery characteristics by reducing decomposition reactions, enhancing cation migration, and achieving higher cyclability and storage retention rates, leading to superior battery performance.
Implementation Method 1
a high-quality film on electrodes to suppress decomposition
Implementation Method 2
enhance cation migration
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes an electrolyte salt. The electrolyte salt includes an imide anion represented by Formula (1).