Al-Se batteries with high theoretical specific capacity and discharge voltage are promising energy storage devices. However, the detrimental shuttle effect occurring in conventional ionic liquid electrolytes (ILEs) challenges their development. Herein, a thicker cathode/electrolyte interphase (CEI) is constructed via employing locally concentrated ionic liquid electrolytes (LCILEs) to overcome these issues. It is demonstrated that LCILEs facilitate the incorporation of Emim+ into the electrode/electrolyte interphases, and, meanwhile, more Al-Cl species deposits are observed in the CEI. The formed CEI effectively prevents the dissolution of poly-selenides and inhibits their related parasitic reactions. These result in Al-Se cells, employing the LCILE, to deliver a specific discharge capacity of 218 mAh g-1 at 0.5 A g-1 after 100 cycles at 20 °C, while the cell using the neat ILE only maintains 38 mAh g-1 under the same conditions. Moreover, an Al-S cell operated in LCILEs reaches 578 mAh g-1 at 0.1 A g-1 after 150 cycles, which is also significantly better than 317 mAh g-1 in the neat ILE. This study provides an LCILE-based strategy to reinforce the CEI in order to suppress the shuttle effect, realizing Al-chalcogen batteries with better performance.