Woven Current Collector Structure for Flexible Lithium Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current flexible batteries lack sufficient cycle-life characteristics and capacities to meet industrial standards, and existing current collectors are either too rigid or lack the necessary flexibility and metal strength.
Innovation Solution
A lithium secondary battery with a current collector structured in a fabric form, where fiber bundles are cross-woven with polymer fibers and metal layers, enhancing flexibility and metal strength while expanding the interface area for improved electron transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid metal current collector is used, then metal strength is improved, but flexibility deteriorates
Solution Approach 1:
The current collector uses a composite structure combining polymer fibers and metal layers. The polymer fiber provides flexibility while the metal layer provides electrical conductivity and strength, resolving the contradiction between rigidity and flexibility
Solution Approach 2:
The current collector employs a fabric form with fiber bundles that can be bent and deformed. This flexible structure allows the battery to be shaped according to various forms while maintaining structural integrity through the metal layers
2Power
If the interface area between electrode and current collector is increased, then electron transfer is improved, but outermost irreversible capacity increases
Solution Approach 1:
The metal layer thickness is optimized to provide sufficient electrical conductivity at the interface while minimizing the volume of active material lost to irreversible reactions. The fabric structure creates localized contact points that improve electron transfer without requiring excessive interface area
Data Source
AI summary
The present invention relates to a lithium secondary battery comprising: a current collector comprising a structure in a fabric form in which fiber bundles are cross-woven, wherein each of the fiber bundles is formed of sets of fiber yarns and each of the fiber yarns includes a polymer fiber and a metal layer surrounding the polymer fiber; and an electrode including an active material layer disposed on at least one surface of the current collector.