MOF Electrolyte Composition for CO2 Capture in Non-Aqueous Cells
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Solution Overview
Problem
Conventional non-aqueous electrolytic solutions for electrochemical devices, such as lithium ion batteries and electric double-layer capacitors, face safety and reliability issues due to gas generation, leading to swelling and potential rupture, as existing materials like zeolite absorb water and degrade electrolytes, and carbon dioxide suction is insufficient with metal-organic frameworks.
Innovation Solution
A non-aqueous electrolytic solution containing a metal-organic framework with an azole-based organic molecule and a metal atom, having a specific surface area to pore volume ratio of 0.55 Å−1 to 0.71 Å−1, effectively suctions and traps carbon dioxide, preventing swelling while maintaining a simple structure and avoiding electrolyte decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zeolite is used as a suctioning material to prevent swelling, then safety is improved, but the battery size increases, structure becomes complicated, and cost increases
Solution Approach 1:
The invention merges the gas suctioning function with the electrolyte solution by dissolving metal-organic framework compounds directly in the electrolyte. This eliminates the need for separate suctioning materials and their associated containers, thereby simplifying the overall battery structure while maintaining the swelling prevention function.
Solution Approach 2:
The invention extracts the gas suctioning function from separate physical materials (like zeolite) and integrates it into the electrolyte solution itself through the addition of metal-organic framework compounds. This extraction allows the electrolyte to perform dual functions: ion conduction and gas absorption.
2Reliability
If porous materials like zeolite are used to suction gas, then swelling prevention is improved, but water absorbability causes Li salt decomposition and characteristic deterioration
Solution Approach 1:
The invention changes the material parameters from traditional porous materials (zeolite) to metal-organic framework compounds with specific properties. These MOF compounds have controlled pore structures and chemical compositions that provide gas suctioning capability while exhibiting low water absorbability, thereby preventing Li salt decomposition.
Solution Approach 2:
The invention uses composite materials - metal-organic framework compounds - that combine the gas adsorption properties of porous materials with chemical stability against water. The MOF structure provides both the physical porosity needed for gas suction and the chemical stability required to avoid electrolyte degradation.
3Reliability
If metal-organic framework is used to suction carbon dioxide, then gas absorption is improved, but sufficient suction amount is not exhibited
Solution Approach 1:
The invention optimizes parameters including the specific surface area to pore volume ratio of the metal-organic framework (0.55-0.71 Å⁻¹), the type of azole-based organic molecules used, and the concentration of MOF in the electrolyte (0.01-10 wt%). These parameter adjustments maximize the CO2 suction capacity while maintaining electrochemical performance.
Solution Approach 2:
The invention enhances the local quality of the electrolyte by incorporating metal-organic framework compounds with specific structural characteristics. The MOF compounds provide localized high-surface-area regions within the electrolyte that are highly effective at CO2 adsorption, creating zones of enhanced gas absorption capability throughout the electrolyte volume.
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 solution provides a high carbon dioxide suction capacity, enhancing the safety and reliability of electrochemical devices by preventing swelling and maintaining electrochemical performance without complicating the device structure or degrading electrolytes.
Implementation Method 1
the metal-organic framework contained in the non-aqueous electrolytic solution of the present invention have a sufficiently high suction amount of carbon dioxide
Data Source
AI summary
A non-aqueous electrolytic solution that contains a metal-organic framework containing an azole-based organic molecule optionally having a hydrophobic group; and a metal atom, and wherein the metal-organic framework has a ratio of a specific surface area to a pore volume of 0.55 Å−1 to 0.71 Å−1