Solvent-Free Amorphous Solid Electrolyte Films
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Solution Overview
Problem
Conventional lithium batteries rely on organic solvents for ionization and ion transport, leading to contamination, reduced shelf-life, and bulkiness, with solvent-free alternatives facing challenges in achieving both high ionic conductivity and mechanical integrity.
Innovation Solution
Development of solid electrolyte films formed from isotropic amorphous mixtures of succinonitrile (SCN), lithium salt, and crosslinkable polyether, which are crosslinked to create flexible, solvent-free films with high ionic conductivity and mechanical strength without relying on a plastic crystal matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic solvents are used for ionization and ion transport, then ionic conductivity is improved, but contamination occurs and shelf-life is reduced
Solution Approach 1:
The invention extracts and removes organic solvents from the electrolyte system, replacing them with a solvent-free solid polymer electrolyte composition consisting of lithium salt, crosslinkable polyether, and succinonitrile. This elimination of solvents directly addresses the contamination and shelf-life issues while maintaining ionic conductivity through the solid matrix.
Solution Approach 2:
The invention creates a composite solid polymer electrolyte material combining lithium salt (for ionization), crosslinkable polyether (for mechanical integrity and ion transport), and succinonitrile (for enhancing ionic conductivity). This composite approach achieves high ionic conductivity without solvents, resolving the contradiction between reliability and harmful factors.
2Reliability
If organic solvents are used, then ion transport is promoted, but the battery becomes heavy and bulky
Solution Approach 1:
The invention removes organic solvents from the battery system, replacing them with a lightweight solid polymer electrolyte matrix. This extraction eliminates the need for heavy metal containment structures while maintaining ion transport capability through the solid state, directly reducing battery weight.
Solution Approach 2:
The crosslinked solid polymer electrolyte forms a flexible, thin-film structure that provides mechanical integrity without the bulk of traditional solvent-based systems. This thin-film approach enables lightweight battery construction while preserving ion transport pathways.
3Reliability
If solvent-free solid electrolyte is created by doping with succinonitrile, then ionic conductivity is improved, but mechanical integrity is lost
Solution Approach 1:
The invention merges the roles of mechanical support and ion conduction into a single integrated solid polymer electrolyte matrix. The crosslinked polyether provides mechanical strength while simultaneously conducting ions, and succinonitrile is incorporated into this matrix to enhance conductivity without compromising the structural integrity provided by the crosslinked network.
Solution Approach 2:
The invention creates a composite solid polymer electrolyte where crosslinkable polyether provides the mechanical framework, lithium salt provides ionization, and succinonitrile enhances ionic conductivity. This composite structure achieves both mechanical integrity and high ionic conductivity simultaneously.
4Strength
If crosslinking is performed to improve mechanical strength, then tensile strength is improved, but phase separation or crystallization may occur
Solution Approach 1:
The invention carefully controls the composition parameters of the ternary system (lithium salt, succinonitrile, and crosslinkable polyether) to ensure the mixture remains in the isotropic amorphous region during crosslinking. By adjusting the ratios of components and selecting appropriate crosslinking conditions, the system achieves high tensile strength while maintaining complete amorphousness and compositional stability.
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 resulting films exhibit ionic conductivities of 10−3 S/cm at room temperature, tensile strengths of 0.4 MPa, and 80% elongation at break, suitable for applications in batteries and photovoltaic cells, while being lightweight and solvent-free.
Implementation Method 1
crosslinking the crosslinkable polyether to form a cured film
Implementation Method 2
ionic conductivities of 10−3 S/cm at room temperature
Data Source
AI summary
A method of creating an electrolyte film includes mixing succinonitrile (SCN), lithium salt and crosslinkable polyether addition to form an isotropic amorphous mixture; and crosslinking the crosslinkable polyether to form a cured film, wherein the cured film remains amorphous without undergoing polymerization-induced phase separation or crystallization.