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  • ASTM
    D7129-09 Standard Test Method for Determination of Ammonia Trapping in a Grafted Battery Separator
    Edition: 2009
    $87.60
    Unlimited Users per year

Description of ASTM-D7129 2009

ASTM D7129 - 09

Standard Test Method for Determination of Ammonia Trapping in a Grafted Battery Separator

Active Standard ASTM D7129 | Developed by Subcommittee: D09.19

Book of Standards Volume: 10.02




ASTM D7129

Significance and Use

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 impurities hence, 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.

1. Scope

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.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D123 Terminology Relating to Textiles

E438 Specification for Glasses in Laboratory Apparatus

E1272 Specification for Laboratory Glass Graduated Cylinders


Keywords

ammonia; battery separator; grafted polyolefin, nonwoven; Ammonia; Battery separator;


ICS Code

ICS Number Code 29.220.01 (Galvanic cells and batteries in general)


DOI: 10.1520/D7129-09

ASTM International is a member of CrossRef.

ASTM D7129

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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