3D Skeleton Separator Coating for Thermal-Stable Battery Cycling
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Solution Overview
Problem
Current methods for improving thermal safety in secondary batteries often compromise electrochemical performance, making it difficult to achieve high thermal stability and long cycle life simultaneously.
Innovation Solution
A separator with a coating comprising a three-dimensional skeleton structure and fillers having a porous structure, where at least part of the fillers are filled into the skeleton, enhancing thermal resistance, adhesion, and ion-conductivity, while maintaining good electrolyte infiltration and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If current methods for improving thermal safety are used, then thermal stability is improved, but electrochemical performance deteriorates
Solution Approach 1:
The patent applies composite materials by combining a three-dimensional skeleton structure (made of polyacrylonitrile nanofibers) with porous filler particles (such as氧化铝, 二氧化硅, or molecular sieves) to create a coating layer that simultaneously provides thermal stability and maintains electrochemical performance. The skeleton structure offers high-temperature resistance while the porous fillers preserve ion conductivity and electrolyte retention, resolving the contradiction between thermal safety and electrochemical performance.
Solution Approach 2:
The patent utilizes porous materials by incorporating filler particles with porous structures into the coating layer. These porous fillers (with pore sizes of 0.1-1.5 nm) maintain high ion conductivity and electrolyte infiltration while the overall coating structure provides thermal stability. The porous structure allows ion transport channels to remain open even at elevated temperatures, thus improving thermal stability without sacrificing electrochemical performance.
2Temperature
If the coating structure is made more complex to improve thermal resistance, then thermal stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the coating layer into two distinct functional components: a three-dimensional skeleton structure formed by polyacrylonitrile nanofibers, and dispersed porous filler particles. This segmentation allows each component to be optimized independently for its specific function (thermal resistance and ion conductivity respectively) while simplifying the overall manufacturing process through a straightforward coating and drying procedure.
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 separator achieves high thermal stability, long cycle life, and good dynamic performance by forming an integrated structure that improves thermal resistance, adhesion, and ion-conductivity, thereby enhancing the performance of secondary batteries.
Implementation Method 1
at least part of the fillers having the porous structure are filled into the three-dimensional skeleton structure
Implementation Method 2
the coating includes a three-dimensional skeleton structure and fillers having a porous structure... high ion-conductivity
Implementation Method 3
good electrolyte infiltration and retention performance
Implementation Method 4
high adhesion
Data Source
AI summary
A separator, a method for preparing the same, and a secondary battery and an electrical device related the same are described. The separator includes a porous substrate and a coating disposed on at least one surface of the porous substrate, in which the coating includes a three-dimensional skeleton structure and fillers having a porous structure, and at least part of the fillers having the porous structure is filled into the three-dimensional skeleton structure.