PFPE Gel Polymer Electrolyte for High-Loading Lithium Cathodes
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Solution Overview
Problem
The high viscosity of gel polymer electrolyte-forming compositions in lithium battery manufacturing makes it difficult to impregnate positive electrodes with high loading amounts, leading to deteriorated charging and discharging characteristics.
Innovation Solution
A gel polymer electrolyte is developed using a crosslinked product of a multifunctional acrylic first polymerizable monomer and a second polymerizable monomer with a perfluoropolyoxyalkylene unit, which adjusts the viscosity of the electrolyte-forming composition to facilitate easier impregnation of positive electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel polymer electrolyte is used to improve safety and stability, then reliability is improved, but viscosity increases making impregnation difficult
Solution Approach 1:
The patent modifies the chemical composition parameters of the gel polymer electrolyte by incorporating specific plasticizers and low-viscosity additives, changing the physical state parameters (viscosity, flexibility) to enable easier impregnation while preserving the gel structure's safety and stability benefits
Solution Approach 2:
The patent creates a composite electrolyte system combining gel polymer matrix with liquid electrolyte additives and plasticizers, forming a multi-phase composite material that exhibits both the safety of gel polymers and the low viscosity of liquid components, resolving the contradiction between reliability and ease of manufacture
2Quantity of substance
If high loading amount positive electrode is used to increase capacity, then quantity of substance is improved, but charging and discharging characteristics deteriorate due to impregnation difficulty
Solution Approach 1:
By adjusting the viscosity parameters of the electrolyte composition through additive selection and concentration optimization, the patent enables complete impregnation of high-loading electrodes, ensuring sufficient electrolyte penetration to maintain high charging and discharging rates while achieving increased capacity
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 improved ionic conductivity and reduced viscosity of the gel polymer electrolyte enhance the cycle characteristics and high-rate characteristics of lithium batteries, even when using positive electrodes with high loading amounts.
Implementation Method 1
the gel polymer is a crosslinked product of i) a multifunctional acrylic first polymerizable monomer including three or more polymerizable functional groups, and ii) a second polymerizable monomer including a perfluoropolyoxyalkylene (PFPE) unit and two or more polymerizable functional groups
Data Source
AI summary
A gel polymer electrolyte for a lithium battery, a lithium battery including the gel polymer electrolyte, and a method of manufacturing the lithium battery are provided. The gel polymer electrolyte includes a gel polymer and a liquid electrolyte, and the gel polymer is a crosslinked product of i) a multifunctional acrylic first polymerizable monomer including three or more polymerizable functional groups and ii) a second polymerizable monomer including a perfluoropolyoxyalkylene (PFPE) unit and two or more polymerizable functional groups.