Patterned Gel Polymer Electrolyte for High-Rate Lithium Batteries
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Solution Overview
Problem
Lithium polymer batteries face challenges with reduced high-rate battery characteristics due to increased film thickness and non-uniform distribution of electrolyte solutions, leading to degraded basic battery performance such as high-rate discharge and life characteristics.
Innovation Solution
A lithium secondary battery is developed with a patterned gel polymer electrolyte layer on one or both surfaces of at least one structure of the positive electrode, negative electrode, or separator, featuring line-type or dot-type coating portions and uncoated portions to enhance ionic conductivity and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the gel polymer electrolyte film is increased to improve mechanical strength, then structural stability is improved, but high-rate battery characteristics are rapidly reduced
Solution Approach 1:
The gel polymer electrolyte layer is divided into multiple thin sub-layers (first gel polymer electrolyte layer and second gel polymer electrolyte layer) separated by a porous layer. This segmentation allows the total electrolyte function to be distributed across multiple thinner interfaces, reducing the effective thickness for ion transport while maintaining overall structural integrity through the porous layer framework.
Solution Approach 2:
A porous layer is introduced as an intermediate dimension between the two gel polymer electrolyte layers. This porous layer provides a three-dimensional network structure that supports ion transport pathways, effectively decoupling the mechanical strength function (provided by the gel layers) from the ion conduction function (enhanced by the porous structure).
2Reliability
If the amount of non-aqueous electrolyte solution is increased to improve ionic conductivity, then ionic conductivity is improved, but uniform distribution of the electrolyte solution becomes difficult
Solution Approach 1:
The porous layer is strategically positioned at the interface between the two gel polymer electrolyte layers, creating a localized region with enhanced porosity and electrolyte solution retention. This local structural modification ensures that the electrolyte solution is concentrated where it is most needed for ion transport, improving ionic conductivity at the critical interface without requiring excessive electrolyte throughout the entire battery structure.
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 patterned gel polymer electrolyte layer improves mechanical strength, overvoltage safety, and rate capability of the lithium secondary battery by ensuring uniform distribution of the non-aqueous electrolyte solution and maintaining structural stability.
Implementation Method 1
a patterned gel polymer electrolyte layer is included on one surface or both surfaces of at least one structure of the positive electrode, the negative electrode, or the separator
Implementation Method 2
an electrolyte solution... basic battery performance, such as high-rate discharge and life characteristics
Data Source
AI summary
The present invention relates to a lithium secondary battery which includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein a patterned gel polymer electrolyte layer is included on one surface or both surfaces of at least one structure of the positive electrode, the negative electrode, or the separator.