ISSN:
1572-8838
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract Manganese dioxides which are suitable as cathodes for Leclanché cells need (a) a high MnO2 content and (b) battery activity. In this study it is shown that thermogravimetric analysis is a valuable method of screening manganese dioxides for battery activity. The parameter used is the temperature, under standard conditions, at which the rate of decomposition to Mn2O3 is maximum. This is called peak decomposition temperature. Battery activity, which was assessed from actual battery discharges, correlated well with peak decomposition temperature for the 20 manganese dioxides examined. A low peak decomposition temperature indicates high battery activity. As the total range of peak decomposition temperatures is only about 130°C, it is essential that the standard conditions are chosen to ensure decomposition of any one material over a narrow temperature range. For this reason the effects on sharpness of decomposition of gaseous environment, rate of gas flow, sample weight, particle size and rate of temperature rise have been examined. A significant improvement was effected by the use of an oxygen rather than a nitrogen environment.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01111859
Permalink