Introduction

Some industries need to have a good correlation between the size and the shape characterisation. In the battery industry, the shape and the size of the particles are very important for the electrical properties of the final product. The particle’s morphology can influence their behaviour, their conduction properties, their mechanical resistance, their life time…

The purpose is to find the best size and shape of the Zinc and Manganese Dioxide particles in order to improve the oxidation reaction.

Purpose of analysis

A battery provides electrical energy due to a chemical reaction between the anode and the cathode. The cathode is made of a manganese dioxide mixture. The anode is made of Zinc which is oxided. For the battery industry, the purpose is to find the best ratio between the size and the shape of the Zinc and Manganese Dioxide in order to improve the oxidation The purpose of the analysis is to determine the shape and the size of the different particles of the battery. The results obtained by CCD analysis will be compared with laser analysis.

Measurement principle

The Expert Shape package

post37The Expert Shape Package includes a CCD microscope, a liquid flow-through cell and the Expert Shape Software. The CCD microscope is completely integrated in the 930e Particle Size Analyzer. The powder sample can be analysed by both CCD and laser channels with fully automated protocol in real time.

The Cilas 930e

The CILAS 930e Particle Size Analyzer (figure 1) is ideal for repetitive, high quality measurements of particle size and shape. Its integrated wet and dry dispersion modes, built in video camera and short optical path make it the most versatile instrument available anywhere. The unique design of the 930 provides a measurement range of 0.3 to 500 μm while maintaining an extremely small footprint.

Standard Operating Procedure

The analysis have been done in wet mode (Table 1 ).

Results correlation (d50 in μm)

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Major benefits of the CILAS Laser and CCD Technologies

CILAS – Particle Shape Analysis Parameters
Threshold value : 130
Perimeter : 72.1505 μm
Surface : 392.2425 μm2
Equivalent Diameter : 19.5 μm
Shape Factor : 0.7328
Diam Feret Min : 16.7443 μm
Diam Feret Max : 24.8985 μm
Aspect Ratio : 0.6979
Orientation : 72.5346°
Heywood Circularity Factor : 1.1653
Fibre Width : 7.6307 μm
Fibre Length : 16.7697 μm
Fibre Curl : 0.3568

 

Benefits for other applications of Size and Shape technology

Abrasives,

Carbon,

Fertilizers,

Food,

Ceramics…

Shape and size analysis simultaneous in real time with automated instrument

Direct comparison of results with the same software on the same curve

Fast calibration build in procedure (ISO 13320)

Batch processing of pictures Data Base

Size distribution results in Number, Volume and Surface

 Custom design filters allows to select given values of the particles parameters for analysis

Full automated routine analysis

Interactive, user friendly software, prevention of operator errors

Conclusion

Those two complementary technologies improve the development process of long lifetime batteries.