High performing magnesium aluminate-coated separator for lithium batteries

A high performing and thermally stable magnesium aluminate (MgAl2O4) coated on both sides of Celgard 2320 for applications in lithium batteries was prepared. The MgAl2O4-coated membrane was thermally stable up to 440 degrees C and capable of up-taking electrolytes up to 250%. The contact angle of MgAl2O4-coated membrane was lower (21 degrees) than that of uncoated membrane. The MgAl2O4-coated ceramic separator exhibited appreciable ionic conductivity and better compatibility with lithium metal anode. Finally, a 2032-type coin cell comprising Li/MgAl2O4-coated separator/LiFePO4 was assembled and its charge-discharge behavior was analyzed at 0.1, 0.5, and 1C-rates. A stable discharge capacity was achieved even at 1C-rate which qualifies this MgAl2O4-coated membrane for lithium battery applications.