Secondary Battery Polymer Electrolyte for Energy Density
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Solution Overview
Problem
Current secondary batteries with gel electrolyte layers face limitations in achieving optimal battery characteristics, such as energy density and cycle stability, due to the configuration of the polymer compounds used in the electrolyte layer, which affects the performance and longevity of electronic devices and energy storage systems.
Innovation Solution
The use of a specific combination of polymer compounds, including first and second homopolymers and copolymers, such as polyvinylidene fluoride, hexafluoropropylene, and tetrafluoroethylene, in the electrolyte layer, which are designed to enhance the solubility and retention properties of the electrolytic solution, allowing for improved lithium ion mobility and battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymer compounds are used in the electrolyte layer, then the battery structure is simple, but the energy density and cycle stability are insufficient
Solution Approach 1:
The patent employs composite polymer materials in the electrolyte layer, combining multiple polymer compounds with specific solubility parameters (17-23 MPa¹/²) to achieve both high cycle stability and practical applicability. This composite approach allows the electrolyte to maintain structural integrity while enabling efficient ion transport, thereby improving reliability without excessive complexity
Solution Approach 2:
The patent systematically adjusts critical parameters of the polymer compounds, including solubility parameters (selecting polymers with 17-23 MPa¹/²), molecular weights (10,000-1,000,000 g/mol), and composition ratios (90-99.9% by weight). These parameter optimizations enable the electrolyte layer to achieve enhanced cycle stability while maintaining manufacturability and structural feasibility
2Use of energy by moving object
If the polymer compound configuration is optimized for better performance, then energy density improves, but the complexity of polymer compound selection and configuration increases
Solution Approach 1:
The patent optimizes energy density by carefully selecting polymer compounds within specific parameter ranges: solubility parameters of 17-23 MPa¹/², molecular weights between 10,000-1,000,000 g/mol, and composition ratios of 90-99.9% by weight. These controlled parameter changes enhance the electrolyte's ability to support high energy density while avoiding unnecessary complexity through systematic parameter selection
Solution Approach 2:
The patent applies local quality optimization by selecting polymer compounds with specific local properties (solubility parameters, molecular weights) that are tailored to the electrolyte layer's specific function. This localized optimization of material properties enables high energy density in the electrolyte layer without requiring complex configurations throughout the entire battery system
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 results in enhanced battery characteristics, including higher energy density and improved cycle stability, enabling more efficient energy storage and longer device operation in electronic devices and energy storage systems.
Implementation Method 1
The electrolytic solution is mounted in the secondary battery in a state of being held by a polymer compound
Implementation Method 2
In the secondary battery including this electrolyte layer, leakage of the electrolytic solution is prevented
Data Source
AI summary
The secondary battery includes an electrolyte layer including an electrolytic solution and a polymer compound, a positive electrode, and a negative electrode. The polymer compound includes one or both of a first polymer compound and a second polymer compound. The first polymer compound further includes a first homopolymer and one or both of a second homopolymer and a second copolymer. The second polymer compound further includes a third copolymer and one or both of a fourth homopolymer and a fourth copolymer.