Battery Electrode Binder Gradient for High-Temperature Endurance
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Solution Overview
Problem
Conventional lithium-ion secondary battery electrodes suffer from poor adhesiveness between the active material layer and the collector, leading to reduced lifespan and output characteristics, especially under high temperature conditions.
Innovation Solution
The battery electrode incorporates a collector with an active material layer containing multiple binders of different specific gravities, where the binders are predominantly present at the collector side, improving adhesiveness and lifespan characteristics by optimizing the distribution and terminal velocity of binder particles during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single type of binder is used in the active material layer, then the manufacturing process is simple, but the adhesiveness between the active material layer and collector is poor
Solution Approach 1:
The patent applies composite materials by combining multiple binders with different specific gravities in the active material layer. This composite binder system improves adhesiveness between the active material layer and collector, resolving the technical contradiction between strength and device complexity.
Solution Approach 2:
The patent implements local quality by creating a gradient distribution of binders within the active material layer. Binders with different specific gravities are strategically positioned at different depths, with heavier binders concentrating near the collector and lighter binders toward the surface, optimizing adhesion at the critical collector interface.
2Duration of action of stationary object
If the active material layer is coated uniformly on the collector, then the manufacturing process is simple, but the lifespan characteristic is reduced
Solution Approach 1:
The patent applies local quality by creating a non-uniform, gradient distribution of binders within the active material layer. Heavier binders with higher specific gravities concentrate near the collector, while lighter binders are positioned toward the surface, optimizing adhesion at the collector interface without requiring complex manufacturing processes.
Solution Approach 2:
The patent utilizes parameter changes by exploiting the specific gravity difference of binders. During the coating and drying process, the specific gravity parameter causes natural segregation of binders, with heavier binders settling near the collector and lighter binders remaining toward the surface, achieving optimized distribution through physical property variations rather than complex manufacturing control.
3Temperature
If conventional binder materials are used, then the manufacturing cost is low, but the high-temperature endurance is poor
Solution Approach 1:
The patent applies composite materials by combining multiple binder types with different specific gravities and thermal properties. This composite binder system provides superior high-temperature endurance compared to conventional single-binder systems, resolving the contradiction between temperature resistance and device complexity.
Solution Approach 2:
The patent employs PVDF and PTFE binders, which are copies or alternatives to conventional binder materials. These fluoropolymer binders replicate and enhance the adhesive functionality of traditional binders while providing superior thermal stability and high-temperature endurance, maintaining low manufacturing cost through the use of established materials.
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 configuration enhances the adhesiveness between the active material layer and the collector, leading to improved cycle characteristics and high-temperature endurance, maintaining battery performance over extended cycles.
Implementation Method 1
the binders are more present at the collector side in the active material layer
Data Source
AI summary
The invention provides a battery electrode capable of improving a lifespan characteristic (cycle characteristic at the time of high temperature endurance). The battery electrode has a collector and an active material layer formed on a surface of the collector. The active material layer includes a plurality of binders having different specific gravities. The binders are more present at the collector side of the active material layer.