Improved Electrochemical Cycling Behavior of ZnO-Coated Li[sub 1.05]Al[sub 0.1]Mn[sub 1.85]O[sub 3.95]F[sub 0.05] Spinel at 55°C

We report on electrochemical properties of ZnO -coated Li 1.05 Al 0.1 Mn 1.85 O 3.95 F 0.05 in nonaqueous lithium-ion cells over a range of ( 3.0 – 4.3 V ) at elevated temperature (55°C). A coating process was developed to modify the surface of spinel Li 1.05 Al 0.1 Mn 1.85 O 3.95 F 0.05 particles. The ZnO -coated Li 1.05 Al 0.1 Mn 1.85 O 3.95 F 0.05 by a hydrothermal process as the coating method gave homogeneous distribution of ZnO on the surface of Li 1.05 Al 0.1 Mn 1.85 O 3.95 F 0.05 particles. The resultant showed superior electrochemical cycling performance at elevated temperature in Li metal employing half-cells. Excellent cyclability was also observed with Li-ion cells adopting graphite as the anode. Possible reasons for the high capacity retention are discussed.