Asymmetric Ionic Compound Electrolyte for Battery Cycle Life
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Solution Overview
Problem
Existing ionic compounds used in electrochemical devices, such as lithium ion secondary batteries, face limitations in solubility and chemical stability, which restrict the performance of electrolytic solutions and secondary batteries in terms of cycle characteristics.
Innovation Solution
An ionic compound with a specific structure, incorporating a central element like boron and asymmetric anions with oxalic acid and oxygen chelate ligands, is introduced to enhance solubility and chemical stability, forming an electrolytic solution that improves the dissociation properties and prevents decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing ionic compounds are used as electrolyte salts, then the electrolytic solution can be formed, but the solubility and chemical stability are insufficient, limiting the cycle characteristics of secondary batteries
Solution Approach 1:
The patent changes the chemical parameters of the ionic compound by introducing specific ligand structures (oxalate and oxygen chelate ligands) and controlling the oxidation state of the central metal element. These parameter changes in the molecular structure directly improve both solubility and chemical stability, resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent creates a composite ionic compound structure combining a central metal element (Mn, Co, Ni, or Zn) with specific organic ligands (oxalate and oxygen chelate ligands). This composite structure achieves synergistic effects where the metal center provides chemical stability while the ligand structure enhances solubility, thereby improving cycle characteristics without sacrificing compositional stability.
2Quantity of substance
If existing ionic compounds are used as electrolyte salts, then the electrolytic solution can be formed, but the solubility is insufficient, limiting the performance of secondary batteries
Solution Approach 1:
The patent modifies the solubility parameters by changing the ligand structure to include oxalate and oxygen chelate ligands with specific molecular configurations. These structural parameter changes enhance the interaction between the ionic compound and solvent molecules, improving solubility while maintaining the chemical stability needed for good cycle characteristics.
3Reliability
If existing ionic compounds are used as electrolyte salts, then the electrolytic solution can be formed, but sufficient chemical stability cannot be obtained, limiting the performance of secondary batteries
Solution Approach 1:
The patent designs a composite ionic compound where the central metal element (with specific oxidation states) provides chemical stability and the organic ligand structure (oxalate and oxygen chelate ligands) provides solubility. This composite approach simultaneously achieves both sufficient chemical stability and adequate solubility, resolving the contradiction between reliability and quantity of substance.
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 improved solubility and chemical stability of the ionic compound lead to enhanced cycle characteristics and chemical stability of the electrolytic solution, resulting in better performance of secondary batteries.
Implementation Method 1
an ionic compound containing an anion such as PF6− and BF4− has been used as an electrolyte salt making much account of the solubility, the ion dissociation property
Data Source
AI summary
A battery capable of improving the cycle characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The electrolytic solution is impregnated in a separator provided between the cathode and the anode. The electrolytic solution contains an ionic compound such as (2,2-difluoromalonate oxalate)lithium borate and [bis(3,3,3-trifluoromethyl)glycolate oxalate]lithium borate as an electrolyte salt. In the ionic compound, an anion has an asymmetric structure, and a ligand having an oxygen chelate structure in the anion has a halogen as an element. In the battery, the chemical stability of the electrolytic solution is improved, compared to a battery in which the electrolytic solution contains bis(oxalate)lithium borate or the like as an electrolyte salt.