| 摘要 |
<p>An annular cathode electrode structure for a sodium-sulphur cell comprising a porous matrix material, typically of carbon fibre material, impregnated with sulphur or sulphur/sodium polysulphides is formed, as shown in Figure 2, by compressing, either in a mould or by rolling, impregnated matrix material or impregnating compressed matrix material, at a temperature at which the impregnant is liquid, to form a plurality of segments 20 of trapezoidal section, preferably joined by webs 21 along the sides of the longer of the two parallel faces, cooling the assembly to a temperature at which the impregnant is solid so that the segments retain their shape, and then folding the assembly to form an annulus which is put in the cell and which, on heating in the cell to melt the impregnant, expands to fill the cathode region.</p> |
