Non-Aqueous Battery Electrode Binder Layout for Even Electrolyte Retention
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face challenges in maintaining effective charge-discharge cycle characteristics due to uneven electrolyte distribution caused by gravitational effects, leading to deteriorated performance.
Innovation Solution
The battery design incorporates a positive and negative electrode assembly with a binder having varying swelling degrees in different regions, specifically making the swelling degree in the electrolyte higher in the upper half region than the lower half region, to maintain even electrolyte distribution and improve cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single binder is used uniformly throughout the electrode, then the manufacturing process is simple, but the electrolyte distribution becomes uneven due to gravitational effects, deteriorating charge-discharge cycle characteristics
Solution Approach 1:
The patent applies local quality by using binders with different swelling degrees in different vertical regions of the electrode. The upper half region (relative to the installed position) contains binders with higher swelling degrees, while the lower half region contains binders with lower swelling degrees. This regional differentiation compensates for gravitational effects on electrolyte distribution, improving charge-discharge cycle characteristics without requiring complex manufacturing processes.
2Quantity of substance
If binders with high swelling degree are used throughout the electrode, then electrolyte retention is improved, but the electrode structure becomes unstable and manufacturing precision decreases
Solution Approach 1:
The patent implements local quality by strategically placing binders with high swelling degrees only in the upper half region of the electrode, while using binders with lower swelling degrees in the lower half region. This spatially differentiated approach ensures adequate electrolyte retention in the upper region without compromising overall electrode structure stability, thereby maintaining manufacturing precision.
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 enhances the retention of non-aqueous electrolyte in the vertical direction, suppressing uneven distribution and thereby improving charge-discharge cycle characteristics.
Implementation Method 1
swelling degree in an electrolyte of the binder disposed in the upper half region is higher than swelling degree in the electrolyte of the binder disposed in the lower half region
Data Source
AI summary
A non-aqueous electrolyte secondary battery includes an electrode body in which a positive electrode and a negative electrode face each other across a separator. The positive electrode includes a positive electrode composite material layer containing a binder, and the negative electrode includes a negative electrode composite material layer containing a binder. The non-aqueous electrolyte secondary battery is characterized in that, in a case of use thereof in a fixed state, and the electrode body is equally divided into two of an upper half region and a lower half region with respect to a vertical direction in this fixed state, a swelling degree with an electrolyte is higher for the binder disposed in the upper half region than a swelling degree with the electrolyte for the binder disposed in the lower half region, in at least one of the positive electrode and the negative electrode.