Ferroelectric Ceramic Separator Structure for Dendrite Suppression
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Solution Overview
Problem
Current separators in secondary batteries face challenges in simultaneously improving safety and cycle performance due to issues like dendrite formation, interface impedance, and side reactions with electrode materials, which can lead to short circuits and capacity loss.
Innovation Solution
A separator comprising a porous base material with a first region containing ferroelectric ceramic particles, which generates a reverse electric field to reduce dendrite formation and enhance ion migration, while minimizing side reactions by distributing the particles evenly and reducing interface impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferroelectric ceramic particles are added to the separator, then safety and cycle performance are improved, but device complexity increases
Solution Approach 1:
The separator is constructed as a composite material system consisting of a porous base material (first polymer) with dispersed ferroelectric ceramic particles (second polymer matrix). This composite structure combines the mechanical integrity and porosity of the base material with the electric field regulation capability of the ferroelectric particles, achieving both safety improvement and structural simplicity.
Solution Approach 2:
The ferroelectric ceramic particles are selectively dispersed within the porous base material at specific locations (first region) rather than uniformly throughout the entire separator. This localized distribution targets the areas most critical for dendrite prevention while minimizing overall complexity and maintaining manufacturing efficiency.
2Object-affected harmful factors
If ferroelectric ceramic particles are dispersed in the separator, then dendrite formation is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The separator utilizes a porous base material structure that naturally facilitates the uniform dispersion of ferroelectric ceramic particles throughout its matrix. The porous architecture provides numerous pathways and spaces for particle distribution, reducing aggregation and achieving homogeneous dispersion without requiring extremely precise manufacturing control.
Solution Approach 2:
The first polymer base material acts as an intermediary matrix that hosts and distributes the ferroelectric ceramic particles. This intermediary structure simplifies the manufacturing process by providing a pre-formed porous framework into which particles can be easily incorporated through conventional mixing and coating techniques, rather than requiring direct precision placement.
3Reliability
If the separator thickness is increased to improve safety, then dendrite puncture resistance is enhanced, but ion conduction efficiency decreases
Solution Approach 1:
The invention changes the functional parameters of the separator by incorporating ferroelectric ceramic particles with specific dielectric properties (dielectric constant between 200 and 3640). These particles generate internal electric fields that actively regulate ion distribution and dendrite growth, allowing for thinner separator designs that maintain both safety and ion conduction efficiency through enhanced electric field management rather than relying solely on increased thickness.
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 effectively reduces the risk of short circuits and enhances safety, capacity, and cycle performance by regulating electric fields and maintaining ion conduction channels, thus improving the overall performance of secondary batteries.
Implementation Method 1
the centers of positive and negative charges inside the ferroelectric particles may be excited to shift, to generate the reverse electric field that can polarize the separator to promote the accelerated movement of active ions
Implementation Method 2
the ferroelectric ceramic particles have a dielectric constant ε, and the ferroelectric ceramic particles satisfy: 200≤ε≤3640. the relatively high dielectric constant of the ferroelectric ceramic particles in the present application is conducive to exerting the ferroelectric effect of the ferroelectric ceramic particles, and can improve the electric field distribution at the separator
Data Source
AI summary
A separator, a method for preparing the same, and a secondary battery and an electrical device related thereto. The separator includes a porous base material and ferroelectric ceramic particles, the porous base material includes a first region and a second region disposed in a thickness direction of the separator, and the ferroelectric ceramic particles are dispersed in the first region.