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 and non-uniform current distribution due to increased film thickness and non-uniform electrolyte distribution, leading to degraded performance and higher manufacturing costs.
Innovation Solution
A lithium secondary battery design incorporating a patterned gel polymer electrolyte layer on one or both surfaces of the positive electrode, negative electrode, or separator, featuring line-type or dot-type coating portions with specific dimensions and arrangements to enhance ionic conductivity and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the film thickness is increased for battery molding, then mechanical strength is improved, but high-rate battery characteristics are rapidly reduced
Solution Approach 1:
The patent divides the electrolyte layer into multiple thin film layers (first electrolyte layer, second electrolyte layer, third electrolyte layer) instead of using a single thick film. This segmentation allows the battery to maintain mechanical strength while improving high-rate characteristics by reducing the overall thickness of the electrolyte film, enabling faster ion transport.
Solution Approach 2:
The patent applies different electrolyte materials with specific properties to different regions or layers. The first electrolyte layer uses a polymer electrolyte with specific molecular weight and structure, while the second and third layers use different polymer electrolytes or gel polymer electrolytes, optimizing local ionic conductivity and mechanical properties for overall performance.
2Reliability
If the amount of non-aqueous electrolyte solution is increased to improve ionic conductivity, then uniform current distribution is achieved, but manufacturing complexity and costs increase
Solution Approach 1:
The patent creates an asymmetric structure where the electrolyte is distributed unevenly across different layers. The first electrolyte layer has different thickness or composition characteristics compared to the second and third layers, allowing optimized electrolyte distribution that ensures uniform current density without requiring excessive electrolyte amount or complex manufacturing processes.
Solution Approach 2:
The patent changes the physical and chemical parameters of the electrolyte layers, including polymer molecular weight (10,000-1,000,000), electrolyte composition ratios, and layer thicknesses, to achieve optimal ionic conductivity and uniform current distribution while maintaining manageable manufacturing complexity.
3Strength
If gel-type polymer electrolyte is used to improve mechanical strength, then structural stability is enhanced, but ionic conductivity and wetting properties are reduced
Solution Approach 1:
The patent uses composite electrolyte structures combining different polymer electrolyte materials. The first electrolyte layer uses a polymer electrolyte with specific molecular weight, while the second and third layers use different polymer electrolytes or gel polymer electrolytes, creating a composite structure that balances mechanical strength and ionic conductivity through material composition optimization.
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 by ensuring uniform electrolyte distribution and excellent lithium ion permeability, thereby enhancing the battery's performance and safety.
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
These gel-type polymer electrolytes are prepared by adding a large amount of non-aqueous electrolyte solution to a polymer matrix, wherein these gel-type polymer electrolytes are known as systems that are close to the commercialization of the lithium polymer battery
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.