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Examination of the graphite additives to electrodes

✍ Scribed by A´. Veres; G. Csath

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
513 KB
Volume
18
Category
Article
ISSN
0378-7753

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✦ Synopsis

The electrodes of most power sources are made by some powder technology technique. To improve the characteristics of accumulators, we must find relationships between the characteristics of the powdered electrode materials and the electrochemical parameters of the accumulator. We have examined the connection between the features of powdered graphite and its applicability to power sources. A plastic bonded, NijCd accumulator, positive electrode was chosen as a model. We chose oxidation by heat treatment as a means of characterizing the electrochemical behaviour of the graphites. The features of powdered graphite, and the connection between the powder characteristics and the electrochemical behaviour of the final cell, may be characterized mathematically.

Physical tests and electrochemical measurements show that a graphite possessing an average oxidizability is the best material to use. If the graphite oxidizes easily it is reduced readily electrochemically. A graphite which is hard to oxidize, however, is usually very coarse and utilisation of the active material reduces exponentially with its addition.

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