Nb2O5　is　added　to　a　borosilicate　sealing　system　to　improve　the　thermo-mechanical　stability　of　the　sealing　interface　between　the　glass　and　Fe-Cr　metallic　interconnect　(Crofer　22APU)　in　solid　oxide　fuel　cells　(SOFCs).　The　thermo-mechanical　stability　of　the　glass/metal　interface　is　evaluated　experimentally　as　well　as　by　using　a　finite　element　analysis　(FEA)　method.　The　sealing　glass　doped　with　4　mol.%　Nb2O5　shows　the　best　thermo-mechanical　stability,　and　the　sealing　couple　of　Crofer　22APU/glass/GDC　(Gd0.2Ce0.8O1.9)　remains　intact　after　50　thermal　cycles.　In　addition,　all　sealing　couples　show　good　joining　after　being　held　at　750　C-omicron　for　1000　h.　Moreover,　the　possible　mechanism　on　the　thermo-mechanical　stability　of　sealing　interface　is　investigated　in　terms　of　stress-based　and　energy-based　perspectives.