Composite Solid Electrolyte for Flexible Cable Batteries
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Solution Overview
Problem
Existing secondary batteries face challenges with liquid electrolytes due to degradation of electrode materials, safety risks, and mechanical weaknesses, while solid polymer electrolytes offer poor ionic conductivity and mechanical properties, necessitating a solid electrolyte with high ionic conductivity and flexibility.
Innovation Solution
A composite solid electrolyte comprising a plastic crystal matrix doped with an ionic salt and a network of non-crosslinked and crosslinked polymers, specifically using succinonitrile with lithium salts and polymers like polyethylene oxide and polyvinylidene fluoride-co-hexafluoropropylene, formed through polymerization to create a semi-interpenetrating network matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolytes are used, then ionic conductivity is high, but safety risks and electrode material degradation occur
Solution Approach 1:
The patent uses a composite structure combining plastic crystal matrix (succinonitrile) with crosslinked polymer networks to create a solid electrolyte that integrates the high ionic conductivity of liquid electrolytes with the safety and structural stability of solid materials, eliminating solvent-based liquid electrolytes entirely
Solution Approach 2:
The patent changes the physical state parameter from liquid to solid by using plastic crystal matrix and crosslinked polymer structures, transforming the electrolyte from a liquid solution to a solid composite material that maintains ionic conductivity while eliminating safety hazards
2Reliability
If plastic crystal matrix electrolytes are used, then ionic conductivity is high, but mechanical strength is poor
Solution Approach 1:
The patent combines plastic crystal matrix electrolyte with crosslinked polymer networks to create a composite where the plastic crystal provides ionic conductivity and the crosslinked polymer provides mechanical strength, achieving both properties simultaneously
Solution Approach 2:
The crosslinked polymer network acts as an intermediary structural framework that provides mechanical support to the plastic crystal matrix, enabling the electrolyte to maintain both high ionic conductivity and sufficient mechanical strength without requiring additional separators
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 electrolyte achieves high ionic conductivity and mechanical strength, eliminating the need for solvents and drying processes, making it suitable for flexible and varied battery shapes like cable-type batteries with improved safety and performance.
Implementation Method 1
a plastic crystal matrix electrolyte which comprises succinonitrile and is doped with an ionic salt
Implementation Method 2
a crosslinked polymer structure formed in the plastic crystal matrix electrolyte, wherein the crosslinked polymer structure is obtained by polymerization of a monomer having two or more functional groups
Data Source
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AI summary
Disclosed is a solid electrolyte for an electrochemical device. The solid electrolyte includes a composite consisting of: a plastic crystal matrix electrolyte doped with an ionic salt; and a network of a non-crosslinked polymer and a crosslinked polymer structure. The electrolyte has high ionic conductivity comparable to that of a liquid electrolyte due to the use of the plastic crystal, and high mechanical strength comparable to that of a solid electrolyte due to the introduction of the non-crosslinked polymer/crosslinked polymer structure network. Particularly, the electrolyte is highly flexible. Further disclosed is a method for preparing the electrolyte. The method does not essentially require the use of a solvent. Therefore, the electrolyte can be prepared in a simple manner by the method. The electrolyte is suitable for use in a cable-type battery whose shape is easy to change due to its high ionic conductivity and high mechanical strength in terms of flexibility.