Sea-Island Organic Electrode Layer for Separator-Free Li Batteries
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density and capacity, and there is a need for improved manufacturing processes that enhance battery life retention and stability.
Innovation Solution
The integration of an organic layer with a sea-island region, comprising an island and sea region, directly with the active material layer, eliminates the need for a separate separator, thereby simplifying the manufacturing process and enhancing adhesion and reducing heat shrinkage, thus increasing battery stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional separator is used and laminated with the active material layer, then the battery structure is stable, but the manufacturing process is complex and costly
Solution Approach 1:
The patent merges the separator and the organic layer into a single integrated layer. The organic layer is formed directly on the separator through electrospinning, creating a composite structure that combines the functions of both components. This eliminates the need for separate lamination processes and reduces manufacturing complexity while maintaining structural stability.
2Reliability
If the organic layer is integrated with the active material layer, then adhesion is high and heat shrinkage is low, but the manufacturing process requires electrospinning
Solution Approach 1:
The patent controls the electrospinning parameters (voltage, distance, solution concentration) to optimize the formation of the organic layer. By adjusting these parameters, the process achieves high adhesion and low heat shrinkage while remaining manufacturable. The controlled parameter changes ensure reproducible results that meet reliability requirements.
3Strength
If the island region area percentage is increased, then adhesion to active material layer is improved, but heat shrinkage rate increases
Solution Approach 1:
The patent creates a sea-island structure where the organic layer contains dispersed island regions within a continuous sea matrix. The island regions provide localized adhesion points to the active material layer, while the sea region maintains overall structural integrity and resists heat shrinkage. This local differentiation of structure and function optimizes both adhesion and thermal stability.
Data Source
AI summary
The present disclosure relates to an electrode for a rechargeable lithium battery, and a rechargeable lithium battery including the electrode. The electrode for a rechargeable lithium battery includes an active material layer for a rechargeable lithium battery, and an organic layer integrated with the active material layer. The organic layer includes a sea-island region including an island region and a sea region, and the area percentage of the island region in the sea-island region is in a range of about 1% to about 20%.