Binder Composition With 10-50 Micrometer Particles
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Solution Overview
Problem
Existing technologies focus on removing large particles from electrical storage device binders to prevent defects, but this approach neglects the potential benefits of incorporating specific-sized particles for improved charge-discharge characteristics.
Innovation Solution
An electrical storage device binder composition that intentionally includes particles of 10 to 50 micrometers in number, enhancing charge-discharge characteristics by improving electron conductivity and capacity retention, while preventing voltage decrease at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large particles are removed from the binder composition, then defect occurrence is reduced, but charge-discharge characteristics deteriorate
Solution Approach 1:
The invention changes the particle size parameter from the conventional removal approach to a specific incorporation approach. By specifying particles with a diameter of 10 µm or more (but less than the separator thickness), the patent transforms the harmful effect of large particles into a beneficial one for improving charge-discharge characteristics while maintaining reliability.
Solution Approach 2:
The invention applies local quality by differentiating between particles of different sizes and their respective roles. Larger particles (10 µm or more) are intentionally incorporated to improve charge-discharge characteristics, while smaller particles are removed to prevent defects. This selective approach based on particle size creates local quality differentiation within the binder composition.
2Volume of moving object
If element thickness is reduced, then device size is reduced, but defect risk increases due to smaller interval between electrodes
Solution Approach 1:
The invention changes the particle size parameter to achieve a dual function: the incorporated particles improve charge-discharge characteristics while also serving as physical spacers that maintain safe intervals between electrodes. This parameter change allows thinning of electrode elements without increasing defect risk.
3Productivity
If particles are incorporated to improve charge-discharge characteristics, then electron conductivity improves, but risk of fatal defects increases
Solution Approach 1:
The invention precisely defines particle size parameters (diameter of 10 µm or more, but less than separator thickness) to achieve the optimal balance. This parameter specification ensures particles are large enough to improve electron conductivity and charge-discharge characteristics, yet small enough to prevent fatal defects by not penetrating the separator.
Data Source
AI summary
The present invention provides an electrical storage device binder composition that can produce an electrode that achieves improved charge-discharge characteristics. The composition includes a polymer (A) and a liquid medium (B), and further includes particles having a particle size of 10 to 50 micrometers in a number of 1,000 to 100,000 per mL.