Oxide-Electrolyte Mixture With Sulfone Interface Diffusion Boost
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Solution Overview
Problem
Existing electrochemical elements face challenges in enhancing the diffusibility of substances at the interface between oxides and electrolytic solutions, particularly in terms of ion conductivity and desolvation of cations.
Innovation Solution
A mixture containing an oxide and an electrolytic solution, where the electrolytic solution is formed of an electrolytic salt dissolved in a sulfone compound, with a self-diffusion coefficient at least 6 times higher than that of the same component not in contact with the oxide, and the oxide being alumina, to enhance diffusibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mixture containing oxide and electrolytic solution is used to improve safety and reduce leakage, then safety is improved, but ion conductivity and diffusibility at the interface deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolytic solution by selecting specific sulfone compounds (cyclic sulfone with 3-8 carbon atoms or chain sulfone with 4-12 carbon atoms) and controlling the oxide particle size (0.1-10 μm). These parameter changes optimize both the safety properties and the interfacial diffusibility, resolving the contradiction between safety improvement and diffusibility maintenance.
2Device complexity
If traditional electrolytic solutions are used to maintain simplicity, then device complexity is low, but ion conductivity and power density are insufficient
Solution Approach 1:
The patent modifies the electrolytic solution composition by selecting specific sulfone compounds and controlling oxide particle size parameters. These changes enhance ion conductivity and power density while maintaining a relatively simple mixture structure, thus resolving the contradiction between device simplicity and power performance.
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 enhanced diffusibility at the interface between the oxide and electrolytic solution improves the rate characteristics and power density of the electrochemical element, reducing interfacial resistance and increasing cycle life.
Implementation Method 1
The self-diffusion coefficient of at least one component contained in the electrolytic solution in contact with the oxide, as measured through pulsed field gradient nuclear magnetic resonance spectroscopy, is equal to or greater than 6 times the self-diffusion coefficient of the same component contained in the electrolytic solution which is not in contact with the oxide
Implementation Method 2
it is important to increase the diffusion rate of the components of the electrolytic solution near the interface between the oxide and the electrolytic solution, including desolvation of cations at the interface between the oxide and the electrolytic solution
Data Source
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AI summary
Provided are a mixture, a sheet, an electrochemical element, and a power storage device which can enhance the diffusibility of substances at the interface between an oxide and an electrolytic solution. A mixture (10) contains an oxide (19) and an electrolytic solution, wherein the electrolytic solution is formed of an electrolytic salt dissolved in a sulfone compound represented by a chemical formula (1). In the chemical formular (1), each of R1 and R2 independently represents a C1-C4 alkyl group, a C1-C4 alkenyl group, or a C1-C4 halogenated alkyl group, or two of the alkyl group, alkenyl group, and halogenated alkyl group are bonded to each other to form a ring structure. The self-diffusion coefficient of at least one component contained in the electrolytic solution in contact with the oxide, as measured through pulsed field gradient nuclear magnetic resonance spectroscopy, is equal to or greater than 6 times the self-diffusion coefficient of the component contained in the electrolytic solution which is not in contact with the oxide, measured at the same temperature as that in measurement of the former self-diffusion coefficient.