Asymmetric Ionic Compound for Battery Electrolyte Conductivity
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Solution Overview
Problem
Ionic compounds used in electrochemical devices and batteries lack sufficient solubility and chemical stability, limiting their conductivity and cycle characteristics.
Innovation Solution
An ionic compound with a structure incorporating a fluorine group, a fluorinated alkyl or aryl group, and an oxygen chelate ligand is introduced, enhancing dissociation and chemical stability, and used as an electrolyte salt in electrolytic solutions for improved conductivity and cycle characteristics in electrochemical devices and batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ionic compounds (e.g., LiPF6, LiBF4) are used as electrolyte salts, then electrochemical devices can be manufactured with existing technology, but the solubility and chemical stability are insufficient, limiting conductivity and cycle characteristics
Solution Approach 1:
The patent modifies the molecular structure of ionic compounds by introducing fluorinated alkyl groups (Formula 1) and optimizing the ratio of cyclic carbonate to chain carbonate solvents (Formula 2). These parameter changes in molecular structure and composition directly improve chemical stability and solubility, resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent creates a composite electrolytic system by combining specific ionic compounds (Formula 1) with a blended solvent system of cyclic and chain carbonates (Formula 2). This composite approach enhances both chemical stability and conductivity simultaneously, addressing the contradiction between reliability and compositional stability.
2Reliability
If electrolyte salts with higher solubility are used, then conductivity of electrolytic solutions improves, but chemical stability may be compromised
Solution Approach 1:
The patent changes the physical-chemical parameters of the electrolyte system by introducing fluorinated alkyl groups in Formula 1 and optimizing solvent ratios in Formula 2. These parameter modifications enhance both solubility and conductivity while maintaining chemical stability, resolving the contradiction between reliability and compositional stability.
3Productivity
If conventional electrolytic solutions are used, then manufacturing process is simple, but cycle characteristics of secondary batteries are insufficient
Solution Approach 1:
The patent optimizes specific parameters including the fluorinated alkyl group structure in Formula 1 and the precise ratio of cyclic to chain carbonates in Formula 2. These targeted parameter changes improve cycle characteristics without requiring complex manufacturing processes, resolving the contradiction between productivity and device complexity.
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 ionic compound improves solubility, chemical stability, and conductivity of electrolytic solutions, leading to enhanced cycle characteristics in electrochemical devices and batteries.
Implementation Method 1
an ionic compound including an anion such as PF6− or BF4− is used as an electrolyte salt
Implementation Method 2
Rf represents a fluorinated alkyl group or a fluorinated aryl group having a carbon number of 1 to 10
Implementation Method 3
Y represents ZC(CR2)dCZ, O2S(CR2)eSO2 or OC(CR2)eSO2
Data Source
AI summary
A battery capable of improving cycle characteristics is provided. An electrolytic solution impregnated with a separator includes an ionic compound with an asymmetric structure such as fluorotrifluoromethyl[oxalage-O,O′] lithium borate as an electrolyte salt. Thereby, compared to the case where an ionic compound with a symmetric structure such as bis[oxalate-O,O′] lithium borate or difluoro[oxalate-O,O′]lithium borate is included as an electrolyte salt, the conductivity of the electrolytic solution is improved.