Lithium Mimic Electrode Assemblies for Ambient Nondestructive Testing
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Solution Overview
Problem
Lithium metal anodes in electrochemical cells are highly reactive, making it challenging to develop nondestructive testing methods that can verify their quality and detect defects without special handling conditions, as they react with environmental humidity, leading to instability and safety concerns.
Innovation Solution
The use of non-reactive lithium mimic materials with similar electrical and thermal conductivity properties to lithium, such as indium, tin, iron, and chromium, which can be used in electrode assemblies to enable nondestructive testing in ambient conditions, allowing for the evaluation of testing technologies without the need for gloveboxes or dry rooms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal anodes are used in electrochemical cells, then the energy storage capacity and electrochemical performance are improved, but the reactivity with environmental humidity increases leading to instability and safety concerns
Solution Approach 1:
The patent creates mock-up samples that copy the structure and key properties of lithium metal anodes using non-reactive materials. These copies replicate the electrical conductivity, thermal conductivity, density, and mechanical properties of lithium metal, allowing NDT technology evaluation without using actual reactive lithium metal, thus resolving the contradiction between energy storage performance and environmental reactivity
Solution Approach 2:
The patent introduces non-reactive materials (such as aluminum, copper, or inert polymers) as intermediary substances that substitute for lithium metal in the mock-up samples. These intermediary materials provide similar electrical and thermal conductivity properties while being chemically stable in ambient conditions, eliminating the harmful reactivity issue while preserving the energy storage-related testing capabilities
2Ease of operation
If lithium metal anodes are handled in ambient conditions, then the ease of operation and testing accessibility are improved, but the chemical stability deteriorates due to reaction with oxidizing species
Solution Approach 1:
The patent creates mock-up samples that copy the structure and key properties of lithium metal anodes using non-reactive materials. These copies replicate the electrical conductivity, thermal conductivity, density, and mechanical properties of lithium metal, allowing NDT technology evaluation without using actual reactive lithium metal, thus resolving the contradiction between energy storage performance and environmental reactivity
Solution Approach 2:
The patent uses non-reactive materials to create an chemically inert environment within the mock-up sample structure. These materials inherently provide an inert atmosphere that prevents reactions with environmental oxidizing species, allowing the sample to be handled in ambient conditions while maintaining chemical stability
3Measurement precision
If nondestructive testing technologies are applied to lithium metal anodes, then the quality verification capability is improved, but the measurement precision deteriorates due to interference from reactive byproducts
Solution Approach 1:
The patent creates mock-up samples that copy the structure and key properties of lithium metal anodes using non-reactive materials. These copies replicate the electrical conductivity, thermal conductivity, density, and mechanical properties of lithium metal, allowing NDT technology evaluation without using actual reactive lithium metal, thus resolving the contradiction between energy storage performance and environmental reactivity
Solution Approach 2:
The patent converts the harmful reactivity of lithium metal into a benefit by using the same non-reactive materials in the mock-up samples that would normally be used as protective coatings on lithium metal. This substitution eliminates the formation of reactive byproducts that interfere with NDT measurements, while the mock-up samples still provide accurate measurement of the underlying electrode structure and defects
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
Enables safe handling and evaluation of lithium-containing battery samples for nondestructive testing, improving the safety and efficiency of testing processes by mimicking the properties of lithium metal, thus facilitating the detection of defects and quality verification in lithium metal anodes.
Implementation Method 1
the non-reactive lithium mimic material may have an electrical conductivity that is within about 10% of an electrical conductivity of lithium
Implementation Method 2
the non-reactive lithium mimic material may have a thermal conductivity that is within about 10% of a thermal conductivity of lithium
Data Source
AI summary
The present disclosure provides electrode assemblies for safe nondestructive testing in ambient conditions. In certain variations, the electrode assembly includes a current collector and a non-reactive lithium mimic material disposed on or near one or more surfaces of the current collector or embedded in the current collector. In other variations, the electrode assembly includes include a current collector, a lithium metal material disposed on or near one or more surfaces of the current collector or embedded in the current collector to form an electrode assembly, and a non-conductive pouch holding the electrode assembly.