Electrode Tab Protective Layer for Electrolyte Resistance
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Solution Overview
Problem
Current lithium-ion battery electrode tabs have limited electrolyte resistance, which affects their reliability in long-term packaging due to corrosion mechanisms when exposed to electrolytes.
Innovation Solution
An electrode tab design featuring a substrate with a protective layer composed of a non-metallic and metal element, with an atomic ratio between 10% to 30%, and a passivation layer, applied via electroplating or electroless plating, is used to enhance electrolyte resistance. The protective layer is strategically placed on the substrate's surface or in grooves, optimizing contact and thickness for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode tab structure is used, then the manufacturing process is simple, but the electrolyte resistance is insufficient leading to poor long-term reliability
Solution Approach 1:
The patent applies composite materials by creating a protective layer with specific atomic ratios of non-metallic elements (10-30%) and metal elements on the electrode tab substrate. This composite structure provides enhanced electrolyte resistance while maintaining manufacturing feasibility through controlled material composition rather than complex structural designs.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the atomic ratio of non-metallic to metal elements in the protective layer within a specific range (10-30%). This parameter optimization achieves the desired electrolyte resistance performance without requiring complex structural modifications, resolving the contradiction between reliability improvement and device complexity.
2Reliability
If the protective layer thickness is increased to improve electrolyte resistance, then the electrolyte resistance improves, but the peeling force and lamination stability may be affected
Solution Approach 1:
The patent optimizes the thickness of the protective layer as a controlled parameter, specifying it should be 2-10% of the electrode tab thickness. This parameter optimization ensures sufficient electrolyte resistance while maintaining adequate peeling force and lamination stability, preventing the contradiction between improved protection and structural integrity.
Solution Approach 2:
The patent applies local quality by positioning the protective layer specifically on the substrate surface where electrolyte contact occurs, with grooves designed to accommodate the protective layer in specific regions. This localized application ensures electrolyte resistance is enhanced where needed while preserving the overall structural strength and peeling force characteristics.
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 significantly improves electrolyte resistance and peeling force stability during high-temperature electrolyte immersion, maintaining performance over extended periods without lamination, thus enhancing the reliability of lithium-ion battery packaging.
Implementation Method 1
a passivation layer covering the outside of the protective layer is further included
Implementation Method 2
the plating layer is arranged outside the substrate by electroplating or electroless plating
Data Source
AI summary
According to embodiments of the present application, an electrode tab is provided comprising a substrate, a protective layer located outside the substrate, wherein the protective layer includes a first non-metallic element and a first metal element and the atomic ratio between the first non-metallic element and the first metal element is in the range of 10% to 30%. The embodiments of the present application further provide an electrode assembly and a battery. The object of the present application is to provide an electrode tab, an electrode assembly and a battery so as to at least achieve the improvement of electrolyte resistance under the immersion of electrolyte.