Alkaline Battery Negative Electrode Composition Particle Size Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing alkaline secondary battery technologies face a challenge in achieving a balance between high output characteristics and durability (cycle life).
Innovation Solution
A negative-electrode composition for alkaline secondary batteries is developed, comprising an active material, a binder resin, and an electrically conductive carbon agent, with specific particle size distributions and ratios, applied to a sheet-shaped metal substrate to form a laminate structure, enhancing both output and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the particle size of active material is reduced to improve output characteristics, then the output characteristics are improved, but the cycle life deteriorates
Solution Approach 1:
The invention changes the particle size parameters of the active material, specifically controlling D50 to be 10 μm or less and D20 to be 30-70% of D50. This parameter optimization resolves the contradiction by finding the optimal particle size range that simultaneously improves output characteristics while maintaining cycle life
Solution Approach 2:
The invention uses a composite negative electrode composition containing active material, binder resin, and electrically conductive carbon material in specific ratios. This composite structure allows the system to achieve both high output characteristics and good cycle life by combining materials with complementary properties
2Power
If the facing area of electrodes is increased to improve output characteristics, then the output characteristics are improved, but the device complexity increases
Solution Approach 1:
Instead of increasing electrode facing area, the invention changes the particle size parameters of the active material (D50 ≤ 10 μm, D20 = 30-70% of D50) to improve output characteristics. This approach achieves the same goal without increasing device complexity
3Power
If the particle size distribution of active material is uniformed to improve output characteristics, then the output characteristics are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The invention specifies precise particle size distribution parameters (D50 ≤ 10 μm, D20 = 30-70% of D50) that optimize output characteristics while establishing clear manufacturing targets. These quantified parameters provide guidance for manufacturing processes, balancing performance improvement with manufacturability
Data Source
AI summary
An alkaline secondary battery negative electrode and a composition forming the negative electrode, containing an active material, a binder resin, and an electrically conductive agent containing an electrically conductive carbon material. When a value of D50 is defined to be an average particle size X and a value of D20 is defined to be a particle size Y in a cumulative particle size distribution obtained by measuring the active material using a laser diffractometry particle size distribution meter, the average particle size X is 10 μm or less, and the particle size Y is in the range of 30% to 70% of the average particle size X.