Layered Electrode Binder Structure for High-Temperature Battery Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery capacity degradation and increased resistance occur when stored at high temperatures due to binder swelling, which affects adhesiveness and electron conductivity.
Innovation Solution
A multi-layered electrode structure with a first layer containing a binder with a low degree of swelling and a second layer with a higher degree of swelling, where the first layer contacts the current collector and the second layer enhances conductive material coverage, reducing resistance and improving high-temperature storage resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer electrode structure with conventional binder is used, then the manufacturing process is simple, but the battery capacity degrades and resistance increases under high-temperature storage due to binder swelling
Solution Approach 1:
The electrode layer is divided into multiple layers (first layer and second layer) with different binder compositions. The first layer contains a binder with low swelling properties to maintain structural integrity, while the second layer contains a binder with high swelling properties to maintain adhesiveness, thereby resolving the contradiction between capacity durability and structural complexity.
Solution Approach 2:
Different regions of the electrode layer are assigned different binder properties: the first layer (closer to current collector) uses low-swelling binder for structural stability, while the second layer (outer layer) uses high-swelling binder for adhesion maintenance. This local differentiation allows each layer to perform its specific function optimally under high-temperature storage.
2Strength
If a binder with high swelling degree is used, then adhesiveness is maintained, but electron conductivity is lost due to excessive swelling under high temperature
Solution Approach 1:
The electrode is segmented into two layers with different binder characteristics. The first layer uses a binder with low swelling degree to preserve electron conductivity and structural framework, while the second layer uses a binder with high swelling degree to ensure adhesiveness, thus resolving the contradiction between maintaining strength and reliability.
Solution Approach 2:
Different binder properties are applied locally to different layers: the first layer's binder is optimized for conductivity preservation (low swelling), while the second layer's binder is optimized for adhesion (high swelling). This local quality differentiation allows simultaneous achievement of both adhesiveness and electron conductivity under high-temperature conditions.
3Reliability
If a binder with low swelling degree is used, then electron conductivity is maintained, but adhesiveness degrades under high-temperature storage
Solution Approach 1:
The electrode structure is segmented into two functional layers: the first layer contains low-swelling binder to maintain electron conductivity and structural framework, while the second layer contains high-swelling binder to provide adhesiveness. This segmentation resolves the contradiction by distributing different functional requirements to different layers.
Solution Approach 2:
Different binder properties are assigned to different local regions (layers) of the electrode. The first layer's binder is locally optimized for conductivity (low swelling), while the second layer's binder is locally optimized for adhesion (high swelling), allowing both electron conductivity and adhesiveness to be maintained simultaneously under high-temperature storage.
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 electrode structure effectively inhibits adhesiveness degradation and electron conductivity loss, maintaining capacity durability and reducing battery resistance, especially under high-temperature storage conditions.
Implementation Method 1
a degree of swelling of the first binder to a liquid electrolyte is lower than a degree of swelling of the second binder to the liquid electrolyte
Implementation Method 2
a degree of swelling of the first binder to a liquid electrolyte is lower than a degree of swelling of the second binder to the liquid electrolyte
Implementation Method 3
maintaining capacity durability and reducing battery resistance, especially under high-temperature storage conditions
Data Source
AI summary
A main object of the present disclosure is to provide an electrode capable of reducing the resistance of a battery and also capable of improving resistance to high temperature storage. The present disclosure achieves the object by providing an electrode to be used for a battery, the electrode including a current collector and an electrode layer, wherein the electrode layer includes layers in the order of a first layer and a second layer; the first layer contains a first binder, the second layer contains a second binder, and a degree of swelling of the first binder is lower than a degree of swelling of the second binder.