Stacked Electrode Assembly With Mesh Collectors for Irreversible Capacity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium batteries face challenges in achieving high capacity and energy density due to increased irreversible capacity at the outermost electrodes, leading to reduced battery life and performance.
Innovation Solution
Employing a stacked electrode assembly with mesh electrode current collectors at the uppermost and/or lowermost portions, which includes a lowermost electrode, an uppermost electrode, and unit stacked bodies with separators in between, where the lowermost and/or uppermost electrodes feature a mesh electrode current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode structures are used in lithium batteries, then manufacturing is simpler, but irreversible capacity increases at outermost electrodes reducing battery life and performance
Solution Approach 1:
The electrode assembly is segmented into multiple unit stacked bodies arranged in sequence, with mesh electrode current collectors positioned at specific locations (uppermost and/or lowermost portions) rather than uniformly throughout. This segmentation allows the beneficial mesh structure to be applied only where it most effectively reduces irreversible capacity, while maintaining simpler conventional structures in intermediate sections.
Solution Approach 2:
The mesh electrode current collector is applied locally at the uppermost and/or lowermost portions of the electrode assembly rather than throughout the entire structure. This local application targets the specific regions where bending phenomena and irreversible capacity loss occur most severely, optimizing performance improvement while minimizing structural complexity and manufacturing difficulty.
2Reliability
If mesh electrode current collectors are used at uppermost and lowermost portions, then irreversible capacity is reduced and energy density is improved, but manufacturing precision requirements increase
Solution Approach 1:
Instead of applying mesh electrode current collectors to all electrodes in the assembly, the invention uses partial action by positioning them only at the uppermost and/or lowermost portions. This partial application achieves the majority of the beneficial effects (reducing irreversible capacity and bending phenomena) while significantly reducing the cumulative manufacturing precision requirements compared to universal application.
3Quantity of substance
If mesh electrode current collectors are employed, then capacity and energy density increase, but device structure becomes more complex
Solution Approach 1:
The electrode assembly is divided into multiple unit stacked bodies with mesh electrode current collectors positioned at specific segments (uppermost and/or lowermost portions). This segmentation enables the high-performance mesh structure to be implemented only where it provides the greatest capacity and energy density benefits, while maintaining simpler structures elsewhere to minimize overall device complexity.
Solution Approach 2:
The mesh electrode current collector structure is applied locally at strategic positions (uppermost and/or lowermost portions) rather than uniformly throughout the entire electrode assembly. This local quality approach maximizes capacity and energy density improvements at critical regions while avoiding the unnecessary structural complexity that would result from universal mesh application.
Data Source
AI summary
Provided is a stacked electrode assembly including: a lowermost electrode arranged on a lowermost portion of the stacked electrode assembly; an uppermost electrode arranged on an uppermost portion of the stacked electrode assembly; at least one unit stacked body arranged between the lowermost electrode and the uppermost electrode and including a positive electrode, a negative electrode, and a separator, the separator being arranged between the positive electrode and the negative electrode; and a separator arranged between the lowermost electrode and the at least one unit stacked body, and between the at least one unit stacked body and the uppermost electrode. A capacity and energy density of a lithium battery may be improved by employing an electrode including a mesh electrode current collector as the lowermost electrode or the uppermost electrode of the stacked electrode assembly.