Battery Separator Porosity Zoning for Capacity Retention Stability
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face challenges in maintaining optimal charge and discharge cycle characteristics, leading to deterioration over time.
Innovation Solution
A non-aqueous electrolyte secondary battery design featuring a separator with a porous substrate and a heat-resistant porous layer, where the porosity of specific regions is adjusted to ensure uniform electrolyte retention, with regions D and E having higher porosity than regions A and C, preventing gradient formation and enhancing cycle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the porosity of the porous filler layer at both ends of the separator is set to be smaller than the porosity at the center portion, then charge and discharge cycle characteristics are improved, but further improvement is still required
Solution Approach 1:
The separator is designed with non-uniform porosity distribution where the porosity of regions D and E (intermediate regions) is set to be larger than the porosity of regions A, B, and C (end and center regions). This local differentiation of porosity properties optimizes electrolyte distribution and prevents gradient formation, thereby improving charge and discharge cycle characteristics and capacity retention rate
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
This design effectively suppresses the deterioration of charge and discharge cycle characteristics by maintaining uniform electrolyte distribution and reaction between electrodes, resulting in improved capacity retention rates.
Implementation Method 1
the porosity of each of the region D and the region E is larger than a porosity of each of the region A, the region B and the region C
Data Source
AI summary
This non-aqueous electrolyte secondary battery is characterized by comprising: a wound electrode body in which a positive electrode and a negative electrode are wound via a separator. Said battery is also characterized in that: when the separator is divided into five parts in the width direction and the five divided regions are defined as a region A positioned on one end of the separator in the width direction, a region B positioned on the other end of the separator in the width direction, a region C positioned in the center of the separator in the width direction, a region D positioned between the region A and the region C, and a region E positioned between the region B and the region C, then the void ratio of the region D and the region E is greater than the void ratio of the region A, the region B, and the region C.