Composed Ionic Liquid Electrolyte for Dye-Sensitized Solar Cells
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Solution Overview
Problem
Current optoelectronic and electrochemical devices, such as dye-sensitized solar cells, face limitations in achieving high power conversion efficiency and long-term stability due to the properties of traditional ionic liquids, which often have high melting points and low conductivity at room temperature.
Innovation Solution
The development of composed ionic liquids comprising three or more component salts, where at least one salt has a melting point above room temperature, and includes cations with charged atoms like N+, P+, C+, S+, and anions like I-, [B(CN)4]-, and NCS-, allowing for improved conductivity and stability at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ionic liquids are used as electrolytes, then thermal stability and low vapor pressure are achieved, but melting points are high and conductivity is low at room temperature
Solution Approach 1:
The patent applies composite materials by combining multiple ionic liquid components (at least three different ionic liquids) to create a composed ionic liquid system. This composite approach allows the electrolyte to achieve low melting points (below room temperature) while maintaining the thermal stability and low vapor pressure characteristics of individual ionic liquid components, thereby resolving the contradiction between thermal reliability and low melting temperature.
Solution Approach 2:
The patent employs parameter changes by systematically varying the composition ratios of different ionic liquid components to optimize the melting point and conductivity parameters. By adjusting the proportions of various ionic liquids in the composed system, the electrolyte achieves optimal room-temperature conductivity while maintaining thermal stability, effectively resolving the parameter trade-off between melting point and conductivity.
2Reliability
If traditional ionic liquids are used as electrolytes, then thermal stability is achieved, but conductivity at room temperature is low
Solution Approach 1:
The patent uses composite materials by formulating an electrolyte from at least three different ionic liquid components in specific ratios. This composite ionic liquid system achieves high conductivity at room temperature by combining components with complementary properties, while simultaneously maintaining the thermal stability characteristic of ionic liquids, thus resolving the contradiction between conductivity and thermal reliability.
Solution Approach 2:
The patent applies parameter changes by optimizing the concentration and composition ratios of different ionic liquid components to maximize conductivity at room temperature. By carefully adjusting these compositional parameters, the electrolyte achieves power conversion efficiencies of up to 8.2% while maintaining thermal stability, effectively resolving the contradiction between conductivity and thermal reliability.
3Productivity
If composed ionic liquids with three or more component salts are used, then power conversion efficiency increases to 8.2%, but device complexity increases
Solution Approach 1:
The patent applies composite materials by combining at least three different ionic liquid components to achieve high power conversion efficiency (up to 8.2%). While this increases compositional complexity, the systematic approach to selecting and combining specific ionic liquid components with complementary properties creates a optimized electrolyte system that justifies the increased complexity through superior performance.
Solution Approach 2:
The patent employs universality by designing a composed ionic liquid system where multiple components work together to achieve multiple functions: low melting point, high conductivity, thermal stability, and high power conversion efficiency. This multi-functional electrolyte composition resolves the contradiction by making the increased compositional complexity worthwhile through achieving superior overall performance.
Data Source
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AI summary
The present invention refers to using the principal of a room temperature molten ionic liquid, to an electrolyte, to devices comprising the ionic liquid co-melting, and to the preparation of a room temperature ionic liquid via various physical and chemical methods. The room temperature molten ionic liquid comprises at least two component salts, at least one of which is not molten at room temperature, but, if combined with another salt, is in the molten state at room temperature.