Sealing L-alloys/FeS(x) cells for a bipolar battery
Abstract
Progress in cell design and materials development has led to the initial tests of sealed Li-alloy/metal sulfide cells for a bipolar battery configuration. Earlier efforts attempted to contain the molten electrolyte by a compressed peripheral gasket. The innovative design approach is to build the cell around a hermetic peripheral seal. This seal consists of metal components bonded to an insulating ceramic ring (e.g., MgO). Prototypic seals maintained secure bonds and showed little apparent reactivity in compatibility tests conducted for more than 1000 h at 450 C in melts with high lithium or sulfur activity. Single sealed FeS bipolar cells were operated for 1000 h and 100 cycles. Efforts are now being concentrated on the Li-alloy/FeS2 bipolar cell with molybdenum positive electrode current collector. Seal compositions that have a good matching of thermal expansion coefficient with molybdenum were developed. Over a dozen seals consisting of steel/ceramic/molybdenum were fabricated based on a 3 cm diameter, bipolar cell design. The bipolar battery is expected to double specific power and increase specific energy by 30 percent over the monopolar battery configuration for (gt)500 W/kg and 200 Wh/kg in an electric-vehicle application.
- Publication:
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Presented at the Electrochemical Society Fall Meeting
- Pub Date:
- October 1989
- Bibcode:
- 1989ecs..meetR..15K
- Keywords:
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- Bipolarity;
- Chemical Analysis;
- Electric Batteries;
- Fabrication;
- Iron Compounds;
- Lithium Sulfur Batteries;
- Performance Tests;
- Sealing;
- Ceramics;
- Electric Motor Vehicles;
- Electrolytes;
- Gaskets;
- Molybdenum;
- Electronics and Electrical Engineering