Lithium Battery Electrode Layout for Heat-Absorbing Short-Circuit Safety
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Solution Overview
Problem
Ensuring safety and reliability while minimizing the decrease in energy density during operation of high-energy density rechargeable lithium batteries is challenging.
Innovation Solution
The development of an electrode for rechargeable lithium batteries featuring an uncoated portion, an active material layer, and an endothermic ceramic layer sequentially applied on a single surface of the current collector, which provides excellent insulation and heat absorption properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high energy density active materials are used to increase battery capacity, then energy density is improved, but safety and reliability deteriorate due to increased heat generation and short circuit risks
Solution Approach 1:
The patent applies different properties to different parts of the electrode: the active material layer provides high energy density in the functional area, while the uncoated current collector portions provide electrical insulation in critical areas. This local differentiation allows the electrode to simultaneously achieve high energy density and safety by having different regions serve different purposes.
Solution Approach 2:
The electrode is segmented into distinct functional regions: active material layers for energy storage and uncoated current collector portions for insulation. This segmentation creates clear functional zones that prevent short circuits while maintaining high energy density in the active material regions.
2Reliability
If insulation layers are added to improve safety, then reliability is improved, but energy density decreases due to additional material layers
Solution Approach 1:
The current collector serves multiple functions: it provides structural support, electrical conductivity in needed areas, and electrical insulation in uncoated areas. This multi-functionality eliminates the need for separate insulation layers, maintaining energy density while ensuring safety through the inherent insulating properties of the uncoated current collector portions.
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 configuration minimizes energy density loss, reduces heat generation during short circuits, and enhances safety and reliability of the lithium batteries.
Implementation Method 1
an endothermic ceramic layer are provided sequentially from one end to the other end on the same single surface of the current collector
Implementation Method 2
The electrode for a rechargeable lithium battery according to some embodiments has excellent insulation and heat absorption effects
Data Source
AI summary
Disclosed are an electrode for a rechargeable lithium battery, an electrode assembly including the same, and a rechargeable lithium battery, the electrode including an uncoated portion; an active material layer; and an endothermic ceramic layer which are provided sequentially from one end to the other end on the same single surface of the current collector.