BaIn 0.3 Ti 0.7 O 2.85 (BIT07) is a new electrolyte material for solid oxide fuel cells (SOFC). Its use with the cathode material La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) is advantageous due to their reaction (above 1000°C) that leads to the formation of perovskite compounds called BLSITCFx (Ba x La 0.58(1−x) Sr 0.4(1−x) In 0.3x Ti 0.7x Co 0.2(1−x) Fe 0.8(1−x) O 3−δ , with 0≤x≤1) at the cathode/electrolyte interface. In this study, the influence of the cathode microstructure on its performance has been investigated, by varying the cathode parameters. An area specific resistance (ASR) value of 0.07Ωcm 2 at 700°C has been reached and more generally the cathodes exhibit good performance (below 0.2Ωcm 2 ) for a large range of thermal treatments, cathode grain sizes and thicknesses. An ageing study realised at 700°C for 320h showed an ageing rate of 0.125%h −1 .