Gel Electrolyte Composition for Smooth, High-Conductivity Sheets
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Solution Overview
Problem
Conventional gel electrolytes face challenges in forming thin layers with high conductivity and smoothness, and their conductivity is insufficient.
Innovation Solution
An electrolyte composition comprising polymers with specific structural units, oxide particles, electrolyte salts, and an ionic liquid, with a polymer content exceeding 90% by mass and a solvent that enhances conductivity and smoothness, allowing for the formation of an electrolyte sheet with excellent tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gel electrolytes are used, then the electrolyte can suppress combustion by reducing released amount, but the conductivity is insufficient and it is difficult to form thin layers with high smoothness
Solution Approach 1:
The patent changes the chemical composition parameters of the gel electrolyte by incorporating specific polymers (polyacrylonitrile, polyvinylidene fluoride, carboxymethyl cellulose) in optimized ratios, along with lithium salts and cyclic carbonates. This composition optimization enables the electrolyte to achieve both high conductivity and excellent sheet formation properties with smooth surfaces, while maintaining combustion suppression capabilities.
Solution Approach 2:
The patent creates a composite gel electrolyte system combining multiple polymer matrices (polyacrylonitrile, polyvinylidene fluoride, carboxymethyl cellulose) with lithium salts and cyclic carbonate solvents. This composite structure synergistically improves conductivity, sheet smoothness, and safety properties, resolving the contradiction between combustion suppression and manufacturing precision.
2Reliability
If conventional gel electrolytes are used, then combustion can be suppressed, but the conductivity remains insufficient
Solution Approach 1:
The patent optimizes the chemical composition parameters by incorporating lithium salts (such as LiClO4, LiBF4, LiPF6) at specific concentrations (1-5 mol/L) within the gel matrix. This parameter optimization significantly enhances ionic conductivity while the gel structure maintains combustion suppression, resolving the contradiction between safety and conductivity.
Solution Approach 2:
The composite gel electrolyte combines conductive lithium salt components with flame-retardant polymer matrices and cyclic carbonate solvents. This composite approach enables the electrolyte to simultaneously achieve high conductivity for battery performance and combustion suppression for safety, eliminating the trade-off between these properties.
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 composition achieves high conductivity and smoothness, enabling the production of a lithium secondary battery with improved discharge rate characteristics and initial capacity close to design capacity.
Implementation Method 1
the solvent is an ionic liquid
Implementation Method 2
The gel electrolyte layer is formed by swelling a matrix polymer with an electrolyte solution
Data Source
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AI summary
Provided is an electrolyte composition, comprising one or two or more polymers, oxide particles, at least one electrolyte salt selected from the group consisting of a lithium salt, a sodium salt, a calcium salt, and a magnesium salt, and a solvent, wherein structural units constituting the one or two or more polymers comprises a first structural unit selected from the group consisting of tetrafluoroethylene and vinylidene fluoride, and a second structural unit selected from the group consisting of hexafluoropropylene, acrylic acid, maleic acid, ethyl methacrylate, and methyl methacrylate, a content of the one or two or more polymers is more than 90% by mass based on a total amount of polymers in the electrolyte composition, and a mass ratio of a content of the first structural unit to a content of the second structural unit in the one or two or more polymers is 50/50 or more.