Multilayer Thin-Film Encapsulation for Battery Stack Volume Reduction
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Solution Overview
Problem
Current thin-film battery encapsulations are excessively thick, accounting for nearly 50% of the battery stack volume, which is inefficient for energy storage applications, and fail to provide adequate protection against ambient chemical reactants over long periods, compromising the anode's performance.
Innovation Solution
A multilayer thin-film encapsulation using alternating metal getter and ceramic diffusion blocker sub-layers, which are impenetrable to oxygen and moisture, reducing the overall thickness while maintaining high-temperature stability and protection performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current non-thin-film encapsulation is used, then protection against ambient chemical reactants is provided, but the encapsulation thickness accounts for nearly 50% of the overall battery stack thickness
Solution Approach 1:
The encapsulation is divided into multiple thin sub-layers (typically 3-7 layers) with alternating functions: metal getter sub-layers (e.g., Li, Al, Ti, Zr) for chemical absorption and ceramic diffusion blocker sub-layers (e.g., Al2O3, SiO2, Ta2O5) for physical barrier protection. This segmentation allows each layer to be optimized for its specific function while maintaining thin overall thickness
Solution Approach 2:
The encapsulation uses composite multilayer structures combining different material types (metallic getters and ceramic blockers) with complementary properties. The metal layers provide chemical reactivity to trap reactants while the ceramic layers provide dense physical barriers to diffusion, creating a synergistic protective system that achieves high performance at reduced thickness
2Quantity of substance
If encapsulation thickness is reduced, then energy density and stack volume efficiency are improved, but long-term protection performance against reactant transmission may be compromised
Solution Approach 1:
The metal getter sub-layers are designed to proactively absorb and trap ambient chemical reactants (O2, H2O, CO2, N2) before they can reach and damage the battery components. This preliminary chemical action prevents reactant accumulation over time, ensuring long-term protection despite reduced thickness
Solution Approach 2:
The alternating metal and ceramic sub-layers create multiple intermediate barriers that progressively impede reactant transmission. The metal layers chemically interact with reactants while the ceramic layers provide physical diffusion barriers, creating a staged defense system that maintains protection performance at reduced 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 multilayer encapsulation significantly reduces the thickness of thin-film batteries while ensuring long-term protection and high-temperature stability, enabling thinner battery stacks with improved energy density and extended shelf-life.
Implementation Method 1
alternating metal getter/metal nitride diffusion blocker sub-layers, which are substantially impenetrable by oxygen and moisture
Implementation Method 2
metal nitride diffusion blocker sub-layers, which are substantially impenetrable by oxygen and moisture
Data Source
AI summary
An electrochemical device is claimed and disclosed, including a method of manufacturing the same, comprising an environmentally sensitive material, such as, for example, a lithium anode; and a plurality of alternating thin metallic and ceramic, blocking sub-layers. The multiple metallic and ceramic, blocking sub-layers encapsulate the environmentally sensitive material. The device may include a stress modulating layer, such as for example, a Lipon layer between the environmentally sensitive material and the encapsulation layer.