Boron Nitride Nanotube Separator for Secondary Batteries
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Solution Overview
Problem
Secondary battery separators face challenges in achieving both excellent electrical insulation and thermal stability while also being lightweight and compact, with existing solutions often requiring additional processes and materials that increase complexity and cost.
Innovation Solution
A separator for secondary batteries is developed using a single layer of porous sheet composed of a polymer matrix with embedded boron nitride nanotubes, which form a network structure, providing improved electrical insulation, thermal stability, and mechanical strength, and reducing weight by eliminating the need for additional ceramic layers or coating processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a separator is made with traditional polymer materials to ensure flexibility and processing ease, then ease of manufacture is improved, but electrical insulation and thermal stability are insufficient
Solution Approach 1:
The separator is constructed as a composite material combining polymer matrix (providing flexibility and processability) with boron nitride nanotubes (providing electrical insulation and thermal stability). This composite structure resolves the contradiction by integrating materials with complementary properties, allowing the separator to maintain ease of manufacture while achieving the required reliability characteristics.
2Reliability
If additional ceramic layers or coating processes are added to improve electrical insulation and thermal stability, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention merges the functions of electrical insulation and thermal stability enhancement directly into the separator matrix through boron nitride nanotube incorporation, eliminating the need for separate ceramic layers or additional coating processes. This integration reduces device complexity and manufacturing steps while maintaining high reliability.
Solution Approach 2:
The boron nitride nanotubes serve multiple functions simultaneously: they provide electrical insulation, enhance thermal stability, and improve mechanical strength all within a single material system. This multi-functionality eliminates the need for separate components or processes, reducing overall device complexity.
3Reliability
If traditional separator materials are used to ensure adequate mechanical strength and thermal resistance, then reliability is maintained, but weight increases reducing battery compactness
Solution Approach 1:
The separator utilizes a porous structure with boron nitride nanotubes embedded in the polymer matrix. This porous architecture reduces the overall density and weight of the separator while maintaining adequate mechanical strength through the nanotube reinforcement and thermal resistance through the polymer-nanotube composite structure.
Solution Approach 2:
The composite material system combines lightweight polymer matrix with high-strength boron nitride nanotubes, achieving an optimal weight-strength-thermal resistance balance. The nanotubes provide reinforcement at minimal weight addition, enabling the separator to meet reliability requirements with reduced overall weight.
4Ease of manufacture
If a single layer structure is used to simplify manufacturing and reduce complexity, then ease of manufacture is improved, but achieving sufficient electrical insulation and thermal stability becomes difficult
Solution Approach 1:
The single-layer separator achieves sufficient electrical insulation and thermal stability through the composite material system of polymer matrix combined with boron nitride nanotubes. The nanotubes provide the necessary insulating and thermal properties within the single layer, eliminating the need for multiple layers while maintaining reliability.
Solution Approach 2:
The boron nitride nanotubes are strategically distributed within the polymer matrix to provide localized enhancement of electrical insulation and thermal stability properties. This local quality approach allows a single-layer structure to achieve the required performance by concentrating functional properties where needed rather than relying on multiple layers.
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 solution achieves enhanced thermal stability, mechanical strength, and electrical insulation, while reducing the weight and complexity of the battery, leading to improved long-term stability and compactness without the need for additional processing steps.
Implementation Method 1
the boron nitride nanotubes form a network in the polymer
Implementation Method 2
have a porosity and a pore size enough to smoothly ensure movement of lithium ions in the electrolyte
Implementation Method 3
When the separator for a secondary battery passes a softening temperature of the separator for a secondary battery due to temperature rise in the battery, the separator for a secondary battery shrinks so that it is desirable that less thermal shrinkage occurs at a high temperature
Data Source
AI summary
The present disclosure provides a separator for a secondary battery which is formed of a porous sheet which includes a binder polymer and boron nitride nanotubes to show excellent electrical insulation, thermal stability, mechanical strength, and reduced weight and contribute to compactness of the secondary battery