Electrode Assembly Host-Guest Adhesive Layer Misalignment
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Solution Overview
Problem
Lithium secondary batteries face issues with electrode and separator misalignment, differing adhesive strengths between electrodes and separators, leading to reduced lifespan and stability, and increased risk of short-circuits upon impact.
Innovation Solution
An electrode assembly with a host-guest chemistry-based adhesive layer, using materials like cyclodextrin and ferrocene, is applied to ensure equal adhesive strength between electrodes and separators, enhancing electrolyte wettability and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive methods are used to bond electrodes and separators, then manufacturing simplicity is maintained, but adhesive strength between electrodes and separators becomes uneven and misalignment occurs
Solution Approach 1:
The adhesive layer is divided into multiple distinct layers including a first adhesive layer between the positive electrode and separator, and a second adhesive layer between the negative electrode and separator. Each layer can be independently formulated to optimize adhesion to specific electrode materials, thereby achieving uniform and strong bonding without requiring complex overall structures.
Solution Approach 2:
Different adhesive compositions are used at different locations within the adhesive layer. The first adhesive layer uses a composition tailored for positive electrode adhesion, while the second adhesive layer uses a composition optimized for negative electrode adhesion. This local customization ensures optimal adhesive strength at each interface without compromising the other.
2Reliability
If electrodes and separator are stacked without proper fixation, then manufacturing process is simple, but misalignment and detachment occur reducing battery stability
Solution Approach 1:
Adhesive layers are pre-formed on the separator before electrode stacking. This preliminary preparation ensures that when electrodes are subsequently positioned, they are immediately secured by the adhesive, preventing misalignment and detachment during the manufacturing process and throughout battery operation.
Solution Approach 2:
The adhesive layer acts as an intermediary substance between the electrodes and separator, providing a bonding interface that secures all components in their proper positions. This intermediary layer prevents direct contact issues and ensures stable fixation without requiring complex mechanical fixation systems.
3Reliability
If adhesive strength between electrodes and separator is uneven, then manufacturing is easier, but electrolyte wettability is compromised and lifespan is reduced
Solution Approach 1:
The adhesive composition is locally optimized for each electrode type. The first adhesive layer is formulated with properties that ensure both strong adhesion to the positive electrode and appropriate electrolyte wettability. Similarly, the second adhesive layer is formulated for negative electrode adhesion and wettability. This local optimization ensures uniform electrolyte distribution throughout the battery without requiring overly complex overall compositions.
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 effectively fixes electrodes and separators in proper positions, improves adhesive strength, reduces the risk of short-circuits, and maintains electrolyte wettability, thereby enhancing the battery's stability and lifespan.
Implementation Method 1
the host and the guest are materials bound to each other by molecular recognition or self-assembly, thereby forming a complex
Implementation Method 2
the host and the guest are materials bound to each other by molecular recognition or self-assembly, thereby forming a complex
Data Source
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AI summary
The present invention provides an electrode assembly, which includes a first electrode, an adhesive layer disposed on the first electrode and including a host layer comprising a host and a guest layer comprising a guest, a separator disposed on the adhesive layer, and a second electrode disposed on the separator, a method of manufacturing the same, and a secondary battery including the same.