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Characterization of the gas composition inside NiMH batteries during charge using GC-MS
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of the project was to develop a method to measure and studythe degree of activation of the negative electrode (MH) in a NiMH battery.This was done by characterization of the gases produced during charge of a battery – O2 and H2 – using a Gas Chromatograph. The current applied in the very first charge of the battery was varied in order to examine how this affects the gas evolution. In the developed method, batteries were charged to 8Ah with 9A, after which a gas sample was taken and analyzed with Gas Chromatography. An additional goal was to use the method to examine the difference in activation between virgin and recycled negative electrode material. A module charged stepwise with 0.07C followed by 0.2C had the lowest share of H2 after two cycles, indicated best activation. However, a higher amount of H2 in the beginning of the activation process could possibly enhance the degree of activation during the following cycles. The method indicated that the module with recycled MH was better activated than the virgin MH. To improve the technique, repeated measurements to get better statistics should be done. Gas samples should be taken at dV/dt=0 in order to take samples at same SoC. The charge current should be adjusted so that the same C rate is always used. This would make the results easier to interpret.

Place, publisher, year, edition, pages
2018. , p. 44
Series
UPTEC K, ISSN 1650-8297 ; 18005
Keywords [en]
NiMH batteries, Batteries, Nickel-metal hydride, Nickel hydroxide, Metalhydride, Gas evolution, Oxygen, Hydrogen, Electochemistry, Gas Chromatography
Keywords [sv]
NiMH-batterier, Batterier, Nickel-metalhydrid, Nickelhydroxid, Metalhydride, Gasutveckling, Syrgas, Vätgas, Elektrokemi, Gaskromatografi
National Category
Inorganic Chemistry Chemical Engineering Other Chemical Engineering Materials Chemistry Analytical Chemistry Other Chemistry Topics Chemical Sciences Other Chemistry Topics
Identifiers
URN: urn:nbn:se:uu:diva-347525OAI: oai:DiVA.org:uu-347525DiVA, id: diva2:1195237
External cooperation
Nilar AB
Subject / course
Chemistry
Educational program
Master Programme in Chemical Engineering
Presentation
2018-01-24, Uppsala, 13:00 (Swedish)
Supervisors
Examiners
Available from: 2018-06-21 Created: 2018-04-04 Last updated: 2018-06-21Bibliographically approved

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