Annealing effect on phase composition and electrochemical properties of the Co-free La(2)MgNi(9) anode for Ni-metal hydride batteries
Present paper focuses on studies of the Co-free La(2)MgNi(9) alloys as active materials of negative electrodes in nickel-metal hydride (NiMH) batteries. The effect of annealing treatment on the phase composition, microstructure, hydrogen absorption-desorption and electrochemical properties was inves...
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Veröffentlicht in: | Electrochimica acta 2013-04, Vol.96, p.27-33 |
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creator | Hu, Wei-Kang Denys, Roman V Nwakwuo, Christopher C Holm, Thomas Maehlen, Jan Petter Solberg, Jan Ketil Yartys, Volodymyr A |
description | Present paper focuses on studies of the Co-free La(2)MgNi(9) alloys as active materials of negative electrodes in nickel-metal hydride (NiMH) batteries. The effect of annealing treatment on the phase composition, microstructure, hydrogen absorption-desorption and electrochemical properties was investigated. The phase-structural composition, microstructures and morphologies of the phases were analyzed by X-ray diffraction and by scanning electron microscopy. Increase of the annealing temperature to 950 degree C leads to a higher abundance of the La(2)MgNi(9) and La(3)MgNi(14) phases and an elimination of the present at lower temperatures LaNi(5-x) and LaMgNi(4) intermetallics. The hydrogen absorption-desorption behaviors, the electrochemical performance and electrochemical cycling stability significantly improve after the annealing. For pasted electrodes, the annealed alloys had a discharge capacity of 350-360 mAhg(-1) compared to 325 mAhg(-1) for the as-cast sample. The discharge capacity of the annealed samples remained high, almost 50% after 300 cycles with 100% depth of discharge (DOD) in half-cell tests. Pellet electrodes prepared from the annealed alloy and carbonyl nickel powder showed a discharge capacity of 396 mAh g(-1). In present work we also report the performance of a small prototype NiMH cell where the annealed alloy was used as the active material in the negative MH electrode and a sintered Ni electrode acted as the positive electrode. After 300 cycles at charge/discharge rates of 0.2 degree C the cell showed a very good cycling stability with its capacity remaining on the level of 87%. |
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The effect of annealing treatment on the phase composition, microstructure, hydrogen absorption-desorption and electrochemical properties was investigated. The phase-structural composition, microstructures and morphologies of the phases were analyzed by X-ray diffraction and by scanning electron microscopy. Increase of the annealing temperature to 950 degree C leads to a higher abundance of the La(2)MgNi(9) and La(3)MgNi(14) phases and an elimination of the present at lower temperatures LaNi(5-x) and LaMgNi(4) intermetallics. The hydrogen absorption-desorption behaviors, the electrochemical performance and electrochemical cycling stability significantly improve after the annealing. For pasted electrodes, the annealed alloys had a discharge capacity of 350-360 mAhg(-1) compared to 325 mAhg(-1) for the as-cast sample. The discharge capacity of the annealed samples remained high, almost 50% after 300 cycles with 100% depth of discharge (DOD) in half-cell tests. Pellet electrodes prepared from the annealed alloy and carbonyl nickel powder showed a discharge capacity of 396 mAh g(-1). In present work we also report the performance of a small prototype NiMH cell where the annealed alloy was used as the active material in the negative MH electrode and a sintered Ni electrode acted as the positive electrode. After 300 cycles at charge/discharge rates of 0.2 degree C the cell showed a very good cycling stability with its capacity remaining on the level of 87%.</description><identifier>ISSN: 0013-4686</identifier><language>eng</language><subject>Alloys ; Annealing ; Discharge ; Electrodes ; Hydrides ; Microstructure ; Nickel ; Phase composition</subject><ispartof>Electrochimica acta, 2013-04, Vol.96, p.27-33</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780</link.rule.ids></links><search><creatorcontrib>Hu, Wei-Kang</creatorcontrib><creatorcontrib>Denys, Roman V</creatorcontrib><creatorcontrib>Nwakwuo, Christopher C</creatorcontrib><creatorcontrib>Holm, Thomas</creatorcontrib><creatorcontrib>Maehlen, Jan Petter</creatorcontrib><creatorcontrib>Solberg, Jan Ketil</creatorcontrib><creatorcontrib>Yartys, Volodymyr A</creatorcontrib><title>Annealing effect on phase composition and electrochemical properties of the Co-free La(2)MgNi(9) anode for Ni-metal hydride batteries</title><title>Electrochimica acta</title><description>Present paper focuses on studies of the Co-free La(2)MgNi(9) alloys as active materials of negative electrodes in nickel-metal hydride (NiMH) batteries. The effect of annealing treatment on the phase composition, microstructure, hydrogen absorption-desorption and electrochemical properties was investigated. The phase-structural composition, microstructures and morphologies of the phases were analyzed by X-ray diffraction and by scanning electron microscopy. Increase of the annealing temperature to 950 degree C leads to a higher abundance of the La(2)MgNi(9) and La(3)MgNi(14) phases and an elimination of the present at lower temperatures LaNi(5-x) and LaMgNi(4) intermetallics. The hydrogen absorption-desorption behaviors, the electrochemical performance and electrochemical cycling stability significantly improve after the annealing. For pasted electrodes, the annealed alloys had a discharge capacity of 350-360 mAhg(-1) compared to 325 mAhg(-1) for the as-cast sample. The discharge capacity of the annealed samples remained high, almost 50% after 300 cycles with 100% depth of discharge (DOD) in half-cell tests. Pellet electrodes prepared from the annealed alloy and carbonyl nickel powder showed a discharge capacity of 396 mAh g(-1). In present work we also report the performance of a small prototype NiMH cell where the annealed alloy was used as the active material in the negative MH electrode and a sintered Ni electrode acted as the positive electrode. After 300 cycles at charge/discharge rates of 0.2 degree C the cell showed a very good cycling stability with its capacity remaining on the level of 87%.</description><subject>Alloys</subject><subject>Annealing</subject><subject>Discharge</subject><subject>Electrodes</subject><subject>Hydrides</subject><subject>Microstructure</subject><subject>Nickel</subject><subject>Phase composition</subject><issn>0013-4686</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqVjTtOxDAURV2AxPDZwyszRSSHBAdKNAJRwFT0I-NcT4wcv-DnKVgA-8YFG6C60rm_M7XRuuvbwdybC3Up8qm1Hs2oN-rnMSXYGNKR4D1cIU60zlZAjpeVJZRQiU0TIVY7s5uxBGcjrZlX5BIgxJ7KDNpx6zNAr7a53b4d96F52NYqTyDPmfahXVBqc_6ecqjww5aCXAeu1bm3UXDzp1eqeX5637209ePrBCmHJYhDjDaBT3LoBjPcmc6Mff-P6C8Q0FTL</recordid><startdate>20130430</startdate><enddate>20130430</enddate><creator>Hu, Wei-Kang</creator><creator>Denys, Roman V</creator><creator>Nwakwuo, Christopher C</creator><creator>Holm, Thomas</creator><creator>Maehlen, Jan Petter</creator><creator>Solberg, Jan Ketil</creator><creator>Yartys, Volodymyr A</creator><scope>7SR</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20130430</creationdate><title>Annealing effect on phase composition and electrochemical properties of the Co-free La(2)MgNi(9) anode for Ni-metal hydride batteries</title><author>Hu, Wei-Kang ; Denys, Roman V ; Nwakwuo, Christopher C ; Holm, Thomas ; Maehlen, Jan Petter ; Solberg, Jan Ketil ; Yartys, Volodymyr A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_miscellaneous_14645616733</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Alloys</topic><topic>Annealing</topic><topic>Discharge</topic><topic>Electrodes</topic><topic>Hydrides</topic><topic>Microstructure</topic><topic>Nickel</topic><topic>Phase composition</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hu, Wei-Kang</creatorcontrib><creatorcontrib>Denys, Roman V</creatorcontrib><creatorcontrib>Nwakwuo, Christopher C</creatorcontrib><creatorcontrib>Holm, Thomas</creatorcontrib><creatorcontrib>Maehlen, Jan Petter</creatorcontrib><creatorcontrib>Solberg, Jan Ketil</creatorcontrib><creatorcontrib>Yartys, Volodymyr A</creatorcontrib><collection>Engineered Materials Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Electrochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hu, Wei-Kang</au><au>Denys, Roman V</au><au>Nwakwuo, Christopher C</au><au>Holm, Thomas</au><au>Maehlen, Jan Petter</au><au>Solberg, Jan Ketil</au><au>Yartys, Volodymyr A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Annealing effect on phase composition and electrochemical properties of the Co-free La(2)MgNi(9) anode for Ni-metal hydride batteries</atitle><jtitle>Electrochimica acta</jtitle><date>2013-04-30</date><risdate>2013</risdate><volume>96</volume><spage>27</spage><epage>33</epage><pages>27-33</pages><issn>0013-4686</issn><abstract>Present paper focuses on studies of the Co-free La(2)MgNi(9) alloys as active materials of negative electrodes in nickel-metal hydride (NiMH) batteries. The effect of annealing treatment on the phase composition, microstructure, hydrogen absorption-desorption and electrochemical properties was investigated. The phase-structural composition, microstructures and morphologies of the phases were analyzed by X-ray diffraction and by scanning electron microscopy. Increase of the annealing temperature to 950 degree C leads to a higher abundance of the La(2)MgNi(9) and La(3)MgNi(14) phases and an elimination of the present at lower temperatures LaNi(5-x) and LaMgNi(4) intermetallics. The hydrogen absorption-desorption behaviors, the electrochemical performance and electrochemical cycling stability significantly improve after the annealing. For pasted electrodes, the annealed alloys had a discharge capacity of 350-360 mAhg(-1) compared to 325 mAhg(-1) for the as-cast sample. The discharge capacity of the annealed samples remained high, almost 50% after 300 cycles with 100% depth of discharge (DOD) in half-cell tests. Pellet electrodes prepared from the annealed alloy and carbonyl nickel powder showed a discharge capacity of 396 mAh g(-1). In present work we also report the performance of a small prototype NiMH cell where the annealed alloy was used as the active material in the negative MH electrode and a sintered Ni electrode acted as the positive electrode. After 300 cycles at charge/discharge rates of 0.2 degree C the cell showed a very good cycling stability with its capacity remaining on the level of 87%.</abstract></addata></record> |
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subjects | Alloys Annealing Discharge Electrodes Hydrides Microstructure Nickel Phase composition |
title | Annealing effect on phase composition and electrochemical properties of the Co-free La(2)MgNi(9) anode for Ni-metal hydride batteries |
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