Ceramic-Adhesive Battery Separator Layers for Thin Cell Reliability
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Solution Overview
Problem
Conventional battery separators face challenges with thermal stability, mechanical flexibility, and adhesion issues, leading to potential shorting and reduced cycle life, especially in thinner designs required for modern devices.
Innovation Solution
The development of battery cell components with multiple layers, including a ceramic first separator layer and an adhesive second layer, which can be formed directly over electrode materials, providing improved mechanical integrity, reduced stress, and enhanced adhesion, while maintaining porosity and air permeability through the use of porogens or microencapsulated materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the separator is made thinner to reduce battery thickness, then the volumetric density improves, but the mechanical strength and thermal stability deteriorate
Solution Approach 1:
The separator is constructed as a composite material combining organic polymer matrix with inorganic ceramic particles (such as alumina, silica, or boehmite). This composite structure provides both the thin profile needed for high volumetric density and the enhanced mechanical strength and thermal stability required for safe operation. The ceramic particles reinforce the polymer matrix, preventing deformation and maintaining structural integrity even at reduced thickness.
Solution Approach 2:
The separator incorporates ceramic particles distributed throughout the polymer matrix to provide localized reinforcement. This creates regions of enhanced mechanical and thermal properties within the thin separator structure, allowing it to maintain strength and stability without increasing overall thickness. The ceramic particles are strategically positioned to address specific stress points and thermal vulnerability areas.
2Volume of moving object
If the separator is made thinner to improve volumetric density, then the battery size reduces, but the adhesion to electrodes deteriorates
Solution Approach 1:
The composite structure of organic polymer and inorganic ceramic particles creates a multi-functional separator that maintains strong adhesion to electrodes while remaining thin. The ceramic particles enhance surface roughness and chemical bonding sites, improving interfacial adhesion between the separator and electrode materials, even when the overall separator thickness is reduced for high volumetric density.
3Ease of manufacture
If conventional separator materials are used, then the manufacturing process is simple, but the thermal stability and cycle life are insufficient
Solution Approach 1:
The separator uses a composite of organic polymer and inorganic ceramic particles that can be manufactured using conventional coating and drying processes. The ceramic particles are dispersed in the polymer matrix through standard mixing techniques, and the layer is applied to electrodes using existing coating equipment. This approach maintains manufacturing simplicity while dramatically improving thermal stability and cycle life through the enhanced material properties.
Solution Approach 2:
The invention changes the material parameters of the separator by incorporating ceramic particles with high thermal stability and mechanical strength. This parameter change allows the separator to withstand higher temperatures and repeated charging cycles without degradation, extending cycle life and improving reliability while maintaining compatibility with existing manufacturing processes.
4Volume of moving object
If the separator thickness is reduced, then the battery becomes more flexible, but the stress during cycling increases
Solution Approach 1:
The composite structure with ceramic particles embedded in the polymer matrix provides enhanced mechanical reinforcement that allows the thin separator to withstand cycling stress. The ceramic particles act as structural support elements that prevent excessive deformation and stress concentration, enabling the separator to remain thin while maintaining flexibility and resisting stress during charge-discharge cycles.
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
This approach results in battery separators with improved thermal stability, reduced thickness, and enhanced operational characteristics, allowing for the production of thinner, more flexible, and reliable battery cells with reduced stress and protection against cut burrs.
Implementation Method 1
a first separator layer including a ceramic material
Implementation Method 2
a second separator layer including an adhesive material
Implementation Method 3
exposing the first separator layer to an energy source to dissolve at least a portion of the porogen
Implementation Method 4
the separator allows ionic transmission for charging and discharging
Data Source
AI summary
Energy storage devices, battery cells, and batteries may include a battery cell component produced by methods including depositing a first separator layer over an electrode material, where the first separator layer includes a ceramic material. The methods may include depositing a second separator layer over the first separator layer, where the second separator layer includes an adhesive material. The methods may also include drying the second separator layer to form the battery cell component.