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7190 |
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Glass sealants for liquid sodium metal batteries |
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Emre Gülbahar / Forschungszentrum Jülich GmbH
, Germany Gerald Dück / Forschungszentrum Jülich GmbH / IEK-1, Germany Sonja-Michaela Groß-Barsnick/ Forschungszentrum Jülich GmbH / ZEA-1, Germany Thomas Koppitz/ Forschungszentrum Jülich GmbH / ZEA-1, Germany Ghaleb Natour/ Forschungszentrum Jülich GmbH / ZEA-1, Germany Christian Roos/ RWTH Aachen University / Institute of Mineral Engineering, Germany |
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As an energy storage solution, liquid Na / NaI-I2 cells are a low cost option for rechargeable batteries at operating temperatures of 100°C. In these systems, molten sodium makes up for anode, a NaSICON ceramic as separator, and cathode is comprised of iodine-based solution. To realize these batteries, tight sealings and electrically insulating properties of the sealing materials are needed. In this work, two glass compositions of B2O3-Al2O3-Na2O-SiO2 system are investigated as joining material for Ti (Grade 2) as battery body material and NaSICON as cell separator. Dilatometry measurements were conducted for sintered glass bars and elongation behavior was compared to titanium housing and ceramic separator material. Viscosity behaviors of glasses were examined by thermo-optical microscopy using TOMMIplus. Suitable sealing temperatures for both glasses were selected from differential scanning calorimetry and TOMMIplus measurements. Joining experiments were carried out with Ti (30 x 30 mm2) metal plates, glasses and NaSICON (20 x 20 mm2) separators, followed by He-leakage test of the joined samples. The interaction between ceramic/sealant/titanium was investigated by means of SEM/EDS. Both glass compositions demonstrated reliable sealing at joining temperatures in the range of 650-700°C. |