Ceramic-Polymer Battery Separator Coating for Heat and Ion Transport
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Solution Overview
Problem
Current lithium-ion battery separators face challenges in improving thermal stability, mechanical properties, reducing gas permeability, enhancing electrolyte wettability, and maintaining high lithium ion conductivity while minimizing internal resistance.
Innovation Solution
A composite separator is developed, comprising a porous matrix membrane coated with a ceramic and polymer composite, where the ceramic enhances heat resistance and bonding with electrodes, and the polymer improves mechanical properties and electrolyte wettability, synergistically reducing gas permeability and internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a polymer coating is introduced to improve heat resistance and bonding strength, then thermal stability and bonding strength are improved, but gas permeability increases and ionic conductivity decreases
Solution Approach 1:
The patent uses a composite coating containing both polymer and ceramic particles. The polymer provides heat resistance and bonding strength, while the ceramic particles maintain porosity and ionic conductivity. This composite structure resolves the contradiction by combining materials with complementary properties to achieve both improved thermal stability and maintained ionic conductivity.
2Temperature
If a polymer coating is introduced to improve heat resistance and bonding strength, then thermal stability and bonding strength are improved, but gas permeability increases
Solution Approach 1:
The composite coating with ceramic particles embedded in the polymer matrix creates a structure that reduces gas permeability while maintaining heat resistance. The ceramic particles provide thermal stability and help control gas transport through the coating layer.
3Productivity
If the coating process is simplified to improve production efficiency, then productivity is improved, but manufacturing precision may be compromised
Solution Approach 1:
The patent combines ceramic particles and polymer into a single composite coating slurry that is applied in one coating step. This merging of materials and processes simplifies the manufacturing procedure, improves productivity, while the synergistic interaction between ceramic and polymer ensures uniform coating formation with good bonding and controlled porosity.
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 achieves improved thermal stability, mechanical strength, low gas permeability, and high lithium ion conductivity, effectively reducing internal resistance and enhancing the safety and performance of lithium-ion batteries.
Implementation Method 1
the composite coating includes a ceramic and a polymer which are mutually dispersed
Implementation Method 2
its role is to block the contact between the positive and negative electrodes and provide a lithium ion transport channel
Implementation Method 3
the ceramic enhances heat resistance and bonding with electrodes
Implementation Method 4
the polymer improves mechanical properties and electrolyte wettability
Data Source
AI summary
The present application relates to a composite separator and a preparation method therefor and use thereof. The composite separator comprises a base film and a composite coating coated on at least one side of the base film, wherein the composite coating comprises ceramics and polymers which are mutually dispersed. The ceramics and the polymers are mutually dispersed, such that the composite separator has good thermal stability, electrolyte wettability and good mechanical properties; and in addition, the hardness of a battery is improved, such that the safety performance of a lithium ion battery is significantly improved.