Composite Battery Separator With Slow-Release Electrolyte Additives
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary batteries face challenges with increased viscosity of electrolyte solutions due to high additive amounts, leading to difficulties in liquid injection and uneven additive distribution, which affect cycle life and safety performance.
Innovation Solution
A composite separator with a solid organic additive layer on a substrate, allowing for continuous addition of organic additives to the electrolyte solution, improving cycle life and safety by controlling additive distribution and reducing internal pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of additives in the electrolyte solution is increased to improve cycle performance, then the cycle performance is improved, but the viscosity of the electrolyte solution increases leading to difficulty in liquid injection and uneven distribution
Solution Approach 1:
The additive is divided into two parts: a small initial amount added to the electrolyte solution and a large amount coated on the separator. This segmentation allows the separator to continuously release additives over time, maintaining effective concentration without increasing initial viscosity or injection difficulty.
Solution Approach 2:
The separator is pre-coated with a large amount of additive before battery assembly. This preliminary action ensures that the separator is ready to continuously release additives during battery operation, eliminating the need for high initial additive concentration in the electrolyte solution.
2Reliability
If the amount of additives in the electrolyte solution is increased to improve cycle performance, then the cycle performance is improved, but the additive distribution becomes uneven
Solution Approach 1:
The separator is designed with localized additive coating on its surface. This local quality approach ensures uniform additive release across the electrolyte solution contact area, preventing uneven distribution while maintaining high effective concentration for improved cycle performance.
3Reliability
If additives are added to improve safety performance, then the safety performance is improved, but the viscosity increases causing operational difficulties
Solution Approach 1:
The separator serves itself by continuously releasing additives from its coating during battery operation. This self-service mechanism ensures safety additives are continuously supplied without requiring high initial concentration in the electrolyte solution, avoiding viscosity increase and injection difficulties.
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 composite separator effectively addresses the viscosity issues by slowly releasing additives into the electrolyte solution, enhancing cycle life and safety performance while maintaining additive concentration for a longer period.
Implementation Method 1
the solid organic additive layer including an organic additive for an electrolyte solution... the electrolyte solution is supplemented with additives by another new way... can add organic additives to the electrolyte solution continuously for a long time
Data Source
AI summary
Provided is a composite separator for a secondary battery and a secondary battery including the composite separator. The composite separator is characterized by comprising a substrate and a solid organic additive layer provided on at least one surface of the substrate, the solid organic additive layer comprising an organic additive for an electrolyte solution. Additives can be added to the electrolyte solution through the composite separator for a secondary battery of the present application, which can improve the cycle life and safety performance of the battery.