Study of La0.8Sr0.2Co0.2Cr0.8O3 − δ as a candidate coating material for the positive current collector in Na/S battery

Perovskite La0.8Sr0.2Co0.2Cr0.8O3 − δ (LSCC) ceramic synthesized by the conventional ceramic processing technique was studied as a novel coating material for the cathode current collector in Na/S battery. Its structure, electrical conductivity, density and thermal expansion coefficient (TEC) were investigated. The corrosion performance of LSCC was in particular evaluated by electrochemical techniques in combination with long-term dip-immersion tests. The results indicated that LSCC exhibited excellent corrosion resistance in molten sodium tetrasulfide at 350 °C. The corrosion current density icorr (0.081 mA cm− 2) was much lower than that of 316 L stainless steel by approximately two orders of magnitude. The corrosion rate of LSCC deduced from immersion test was as low as about 12 μm year− 1.