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The study of aluminium anodes for high power density Al/Air batteries with brine electrolytes

The study of aluminium anodes for high power density Al/Air batteries with brine electrolytes
The study of aluminium anodes for high power density Al/Air batteries with brine electrolytes
Aluminium alloys containing small additions of both tin (~0.1 wt %) and gallium (~0.05 wt %) are shown to dissolve anodically at high rates in sodium chloride media at room temperatures; current densities >0.2 A cm-2 can be obtained at potentials close to the open circuit potential, ~-1500 mV vs SCE. The tin exists in the alloys as a second phase, typically as ~1 ?m inclusions (precipitates) distributed throughout the aluminium structure, and anodic dissolution occurs to form pits around the tin inclusions. Although the distribution of the gallium in the alloy could not be established, it is also shown to be critical in the formation of these pits as well as maintaining their activity. The stability of the alloys to open circuit corrosion and the overpotential for high rate dissolution, both critical to battery performance, is shown to depend on factors in addition to elemental composition; both heat treatment and mechanical working influence the performance of the alloy. The correlation between alloy performance and their microstructure has been investigated.
air batteries, hydrogen evolution, alloy anodes, activation, electrochemical-behavior, grain-boundary, brine-based batteries, penetration, al alloy electrochemistry, gallium, al dissolution, trace-element lead
0378-7753
445-455
Nestoridi, Maria
d9523d31-41a8-459a-8831-70e29ffe8a73
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Jones, Richard L.
f75642ae-5121-418e-ac38-dd2ff7ec9c3a
Stokes, Keith R.
5fb4e7f7-2f7e-4e6e-a045-6d7690626695
Wilcock, Ian
486e4b91-6ede-4d36-8a25-1f6380503501
Nestoridi, Maria
d9523d31-41a8-459a-8831-70e29ffe8a73
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Jones, Richard L.
f75642ae-5121-418e-ac38-dd2ff7ec9c3a
Stokes, Keith R.
5fb4e7f7-2f7e-4e6e-a045-6d7690626695
Wilcock, Ian
486e4b91-6ede-4d36-8a25-1f6380503501

Nestoridi, Maria, Pletcher, Derek, Wang, Shuncai, Jones, Richard L., Stokes, Keith R. and Wilcock, Ian (2008) The study of aluminium anodes for high power density Al/Air batteries with brine electrolytes. Journal of Power Sources, 178 (1), 445-455. (doi:10.1016/j.jpowsour.2007.11.108).

Record type: Article

Abstract

Aluminium alloys containing small additions of both tin (~0.1 wt %) and gallium (~0.05 wt %) are shown to dissolve anodically at high rates in sodium chloride media at room temperatures; current densities >0.2 A cm-2 can be obtained at potentials close to the open circuit potential, ~-1500 mV vs SCE. The tin exists in the alloys as a second phase, typically as ~1 ?m inclusions (precipitates) distributed throughout the aluminium structure, and anodic dissolution occurs to form pits around the tin inclusions. Although the distribution of the gallium in the alloy could not be established, it is also shown to be critical in the formation of these pits as well as maintaining their activity. The stability of the alloys to open circuit corrosion and the overpotential for high rate dissolution, both critical to battery performance, is shown to depend on factors in addition to elemental composition; both heat treatment and mechanical working influence the performance of the alloy. The correlation between alloy performance and their microstructure has been investigated.

Full text not available from this repository.

More information

Published date: 15 March 2008
Keywords: air batteries, hydrogen evolution, alloy anodes, activation, electrochemical-behavior, grain-boundary, brine-based batteries, penetration, al alloy electrochemistry, gallium, al dissolution, trace-element lead
Organisations: Engineering Mats & Surface Engineerg Gp, Chemistry

Identifiers

Local EPrints ID: 50109
URI: http://eprints.soton.ac.uk/id/eprint/50109
ISSN: 0378-7753
PURE UUID: f2461e1e-10f7-455d-8228-1b6b557f1a7c
ORCID for Maria Nestoridi: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 01 Feb 2008
Last modified: 10 Dec 2019 01:55

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