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ASTM D7129-09

Отменен
Standard Test Method for Determination of Ammonia Trapping in a Grafted Battery Separator (Withdrawn 2015) — 3 стр.
Причина отмены This test method covers the measurement of the ability of a material to capture ammonia.

Formerly under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials , this test method was withdrawn in April 2015. This standard is being withdrawn without replacement due to its lack of an established Precision and Bias statement, which was required to be provided on or before 2012.

Значение и использование

Nickel metal hydride (Ni-MH) cells/batteries can exhibit high self-discharge rates. Nitrate impurities in the positive electrode can be reduced to ammonia on the negative electrode. This causes rapid self-discharge. Technical publications have reported a link between the separator ammonia trapping capabilities and the cells charge retention. Grafted polyolefin separators can absorb or trap these impuritieshence, reducing self-discharge rates. The level of ammonia trapping from this method gives an indication of the efficiency of a separator to trap these contaminates, thus helping a battery self discharge ( charge retention). A higher value should allow a cell to have greater charge retention.

Область применения

1.1 This test method covers the measurement of the ability of a material to capture ammonia.

1.2 This test method is intended primarily for testing grafted polyolefin materials used as a battery separator, although other materials could be tested.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

ICS
29.220.01 Galvanic cells and batteries in general / Гальванические элементы и батареи в целом
Сборник ASTM
10.02 Electrical Insulation (II): D2519–latest / Электрическая изоляция (II): с D2518 и далее
Тематика
Electrical Insulating Materials