GALVANIC HIGH ENERGY CELLS WITH MOLTEN SALT ELECTROLYTES
The development work during the period 1980 - 1983 was mainly directed towards the development of technical LiAl/FeS cells with molten salt electrolyte, the development of separators, tests of cells and modules, and more basic work. An important objective in the cell development was the improvement of cycle life at constant specific energy. Technical cells with 140 Ah nominal capacity at the five hour rate and 100 Wh. kg**-1 specific energy performed up to 400 full cycles (30 A discharge), while in 10 Ah test cells more than 2000 full cycles have been demonstrated. The improvement of cycle life of technical cells was achieved by the use of improved separators fabricated from MgO powder and by a vacuum tight electrical feedthrough. A design concept of a 10 cell module has been developed based upon 200 Ah cell with two positive and three negative plates. A detailed investigation of safety aspects showed that there is no specific risk related to the LiAl - molten salt - FeS system. Compared with conventional cells with mobile aqueous electrolyte the LiAl/FeS high temperature system seems to have some advantage. Thermal management of a 24 kWh battery was investigated and the Ohmic heat generated in the leads seems to be the critical factor. A range of total materials cost between 60 and 130 DM/kWh has been estimated depending on cell type and cell design. The price of LiAl/FeS batteries will most probably also be in the range of conventional secondary batteries. The cost - benefit analysis shows a considerable potential of energy conservation by the use of lightweight high energy batteries. Compared with a expected technical life of 7 years a pay-back period between 2 and 6 years seems attractive. However, the economy of the electric vehicle is strongly influenced by the higher purchase price of an electric vehicle and the present energy level.
Bibliographic Reference: EUR 9716 DE (1985) MF, 181 P., BFR 300, BLOW-UP COPY BFR 905, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123056300 / Last updated on: 1987-01-01
Available languages: de