Battery Electrode Binder Composition for Slurry Coatability
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Solution Overview
Problem
Existing binder compositions for non-aqueous secondary battery electrodes suffer from inadequate coatability and low-temperature cycle characteristics, leading to defects in the electrode mixed material layer and reduced performance at low temperatures.
Innovation Solution
A binder composition for non-aqueous secondary battery electrodes is formulated to have specific particle size and proportion controls, with particles between 5 µm and 15 µm limited to 2,000 particles/L and over 15 µm to 40% or less, enhancing coatability and low-temperature cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If binder composition is used to form electrode mixed material layer, then electrode can be formed, but coatability is insufficient causing craters and coating defects
Solution Approach 1:
The patent applies parameter changes by controlling the particle size distribution of the binder composition. Specifically, it limits particles of 5 µm or more to 0.1 wt% or less and particles of 15 µm or more to 0.05 wt% or less of the total binder composition weight. This precise control of particle size parameters improves coatability and prevents crater formation in the electrode mixed material layer.
2Reliability
If binder composition is used for electrode formation, then electrode can be formed, but low-temperature cycle characteristics are reduced
Solution Approach 1:
The patent improves low-temperature cycle characteristics by changing the particle size distribution parameters of the binder composition. By limiting fine particles (5 µm or more) to 0.1 wt% or less and coarse particles (15 µm or more) to 0.05 wt% or less, the binder composition maintains optimal flow and binding properties at low temperatures, enhancing battery cycle performance.
Solution Approach 2:
The patent applies local quality by creating a specific particle size distribution within the binder composition. The controlled low content of both fine and coarse particles creates an optimal local structure that enhances low-temperature performance while maintaining overall binder functionality.
3Ease of manufacture
If particles in binder composition are not controlled, then binder composition can be produced, but slurry composition coatability deteriorates
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges for particle size distribution in the binder composition. By controlling particles of 5 µm or more to 0.1 wt% or less and particles of 15 µm or more to 0.05 wt% or less, the binder composition remains easy to produce while achieving excellent slurry coatability and preventing coating defects.
Data Source
AI summary
A binder composition for a non-aqueous secondary battery electrode contains a polymer and a solvent. In a situation in which the binder composition for a non-aqueous secondary battery electrode is subjected to filtration using a mesh filter having an opening size of 5 µm, the number of particles having a maximum diameter of not less than 5 µm and not more than 15 µm that are observed on the mesh filter after the filtration is 2,000 particles/L or less, and the proportion of the number of particles having a maximum diameter of more than 15 µm relative to the total number of particles that are observed on the mesh filter after the filtration is 40% or less.