Extrusion of closed end tubes for applications in sodium-beta alumina solid electrolytes

Johnson, Nathan (2014). Extrusion of closed end tubes for applications in sodium-beta alumina solid electrolytes. University of Birmingham. M.Res.

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Abstract

The role of efficient energy storage in the distribution of domestic and industrial power is increasing with intermittent renewable energy sources. A method shown to have a low capital cost is the sodium-sulphur battery, which uses a conductive beta-alumina solid electrolyte (BASE) to transfer charge between the anode and cathode. Using paste extrusion to obtain the desired shape, followed by reaction sintering, capital savings could be made compared to the current method of production, electrophoretic deposition. This thesis investigates the role of both solid and liquid components in the paste formulation stage, as well as experimental considerations in the production of the required shape, a hollow tube with one end having a closed, domed shape. It was found that using sources of sodium ions with a high solubility led to undesirable characteristics associated with a change in binder rheology. Predictions for the pressure drop through the die were made with reasonable accuracy, although with such complex geometry, the ram displacement was difficult to predict. Using a die with so many pieces attached together was shown to have difficulties producing a straight extrudate consistently, although the formation of a closed domed end was demonstrated successfully.

Type of Work:

Thesis (Masters by Research > M.Res.)

Award Type:

Masters by Research > M.Res.

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