Annular cathode electrode structures for sodium sulphur cells

Chemistry: electrical current producing apparatus – product – and – Fluid active material or two-fluid electrolyte combination... – Active material in molten state

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429 94, 429122, 429209, H01M 480

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active

043605753

ABSTRACT:
For a cylindrical sodium sulfur cell, a cathode electrode structure is provided with improved electronic conductivity in the radial direction, compared with other directions, by forming a block of fibre material, e.g. graphite fibres, with the fibres aligned in one direction, slicing the block to form a sheet with fibres normal to the plane of the sheet, moulding the sheet and impregnating it with cathodic reactant in a heated mould having a plurality of ribs, to form a plurality of trapezoidal segments with the fibres normal to the planes of the parallel surfaces of the trapezoids, cooling the mould so that the impregnant is solidified and then forming the trapezoids into an annular structure. Preferably the mould is such that thin webs are left joining adjacent trapezoidal sections along parallel edges of the wider of the two parallel faces so that the webs form hinges for folding the segments into the annular assembly.

REFERENCES:
patent: 4052535 (1977-10-01), Robinson et al.
patent: 4076902 (1978-02-01), Senoo
patent: 4118545 (1978-10-01), Jones et al.
patent: 4243733 (1981-01-01), Brennan

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