Secondary Battery Electrolyte Layer Composite Design
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving high energy density and long cycle life due to limitations in electrolyte layer configuration, leading to suboptimal battery characteristics for applications requiring high performance and multi-functionality.
Innovation Solution
A secondary battery design incorporating a polymer compound with vinylidene fluoride and hexafluoropropylene, along with inorganic particles, in the electrolyte layer, optimizing the weight ratio of electrolytic solution to polymer compound within a specific range (2.5 to 50) to enhance ionic conductivity and physical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer compound is used in the electrolyte layer to prevent leakage, then reliability is improved, but device complexity increases due to additional material components
Solution Approach 1:
The electrolyte layer is formed as a composite material comprising a polymer compound (such as polyvinylidene fluoride or polyacrylonitrile) and an inorganic compound (such as lithium oxide, beryllium oxide, or magnesium oxide). This composite structure combines the leakage-preventing properties of the polymer with the ionic conductivity and structural stability of the inorganic compound, achieving both reliability improvement and controlled complexity through material integration rather than separate components
Solution Approach 2:
The invention optimizes the weight ratio of the polymer compound to the inorganic compound within a specific range (0.3 to 3.0) to achieve the desired balance between leakage prevention and ionic conductivity. By controlling this parameter, the electrolyte layer maintains appropriate physical strength and ionic transport properties without requiring complex multi-layer structures or additional additives
2Use of energy by moving object
If the weight ratio of electrolytic solution to polymer compound is increased to improve ionic conductivity, then energy density is improved, but physical strength deteriorates
Solution Approach 1:
The invention optimizes the weight ratio of electrolytic solution to polymer compound within a specific range (2.5 to 50) to achieve the desired balance between ionic conductivity and physical strength. By controlling this parameter, the electrolyte layer maintains appropriate viscosity and structural integrity while ensuring sufficient ionic transport for high energy density
Solution Approach 2:
The addition of inorganic compounds to the polymer compound creates a composite electrolyte layer that provides structural reinforcement. This composite structure allows the system to maintain physical strength even when the electrolytic solution content is increased for improved ionic conductivity, as the inorganic compound acts as a structural scaffold
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
This configuration significantly improves the battery's cycle retention rate and discharge capacity, even under severe conditions, providing excellent battery characteristics for various applications including electric vehicles and power tools.
Implementation Method 1
the electrolytic solution may be mounted, in the secondary battery, being held by a polymer compound
Implementation Method 2
The electrolyte layer includes an electrolytic solution, a polymer compound, and a plurality of inorganic particles
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolyte layer. The electrolyte layer includes an electrolytic solution, a polymer compound, and a plurality of inorganic particles. The polymer compound includes a copolymer including vinylidene fluoride and hexafluoropropylene, and a ratio W2/W1 of a weight W2 of the electrolytic solution to a weight W1 of the polymer compound is from 2.5 to 50.