Nanoporous Separator Anode Coating for Higher-Density Batteries
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Solution Overview
Problem
Lithium batteries face limitations in energy and power density due to thick separators and metal substrates, which also increase manufacturing complexity and costs, particularly in high-power applications like electric vehicles.
Innovation Solution
The use of nanoporous separators with a thin, heat-resistant structure allows direct coating of anode layers, reducing the thickness of metal substrates and increasing the proportion of electroactive material, while simplifying the manufacturing process by using less complex equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick separators and metal substrates are used to maintain mechanical strength and alignment, then structural integrity is improved, but energy density and power density deteriorate due to reduced volume of electroactive material
Solution Approach 1:
The patent employs nanoporous separators with controlled pore structures that provide mechanical strength while maintaining thin profiles. The porous architecture allows the separator to achieve sufficient structural integrity through its three-dimensional network, reducing the need for thick non-active materials and increasing the proportion of electroactive material in the battery assembly.
Solution Approach 2:
The patent utilizes composite structures combining organic-inorganic hybrid materials in the separator and coating layers. These composite materials provide enhanced mechanical properties and thermal stability at reduced thicknesses, allowing thinner separators and substrates that maintain strength while increasing electroactive material volume fraction.
2Reliability
If thick separators and metal substrates are used to ensure alignment and quality, then manufacturing reliability is improved, but device complexity and manufacturing cost worsen due to requirements for complex automated equipment
Solution Approach 1:
The patent integrates multiple functions into the separator and coating layers, combining mechanical separation, alignment guidance, and structural support functions. By merging these functions into fewer components with multifunctional designs, the patent reduces the number of separate parts requiring precise alignment and simplifies the manufacturing process, eliminating the need for complex automated interleaving equipment.
Solution Approach 2:
The separator and coating layers are designed as universal components that simultaneously perform multiple functions: electrical insulation, mechanical separation, alignment reference, and structural support. This multi-functionality reduces the overall component count and simplifies manufacturing by eliminating the need for specialized equipment for each function.
3Strength
If thick separators and metal substrates are used to achieve sufficient mechanical strength, then structural integrity is improved, but energy density deteriorates due to lower proportion of electroactive material
Solution Approach 1:
The nanoporous separator structure provides high structural integrity through its three-dimensional porous network, which maintains mechanical strength at significantly reduced thickness compared to solid separators. This allows the battery design to allocate more volume to electroactive materials while maintaining sufficient structural support.
Solution Approach 2:
The patent changes the physical and chemical parameters of the separator and coating materials to achieve higher strength-to-thickness ratios. By optimizing pore size, wall thickness, and material composition, the separator achieves sufficient mechanical strength at thinner profiles, increasing the proportion of electroactive material in the overall battery structure.
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 enhances energy and power densities of lithium batteries and reduces manufacturing costs by enabling thinner, more efficient battery construction suitable for high-power applications like electric vehicles.
Implementation Method 1
nanoporous separators with a thin, heat-resistant structure allows direct coating of anode layers
Implementation Method 2
direct coating of anode layers, reducing the thickness of metal substrates
Implementation Method 3
nanoporous separators with a thin, heat-resistant structure
Data Source
AI summary
Provided are methods of preparing a separator/anode assembly for use in an electric current producing cell, wherein the assembly comprises an anode current collector layer interposed between a first anode layer and a second anode layer and a porous separator layer on the side of the first anode layer opposite to the anode current collector layer, wherein the first anode layer is coated directly on the separator layer.