Title :
Thin film Li-LiMn2O4 batteries
Author :
Bates, J.B. ; Lubben, D. ; Dudney, N.J.
Author_Institution :
Oak Ridge Nat. Lab., TN, USA
Abstract :
Thin-film rechargeable Li-LiMn2O4 batteries have been fabricated and characterized. Following deposition, by electron beam evaporation of LiMn2O4, the amorphous as-deposited cathode films 1 cm2 in area by 0.3 to 4 μm thick were annealed at 700°C to 800°C in oxygen in order to form the crystalline spinel phase. The capacity of the cells between 4.5 V to 3.8 V depended on the annealing conditions and ranged from 50 μAh/mg to 120 μAh/mg. When cycled over this range, the batteries exhibited excellent secondary performance with capacity losses as low as 0.001% per cycle. On charging to 5.3 V, a plateau with a median voltage of 5.1 V was observed. The total charge extracted between 3.8 V to 5.3 V corresponded to about 1Li/Mn2O4
Keywords :
annealing; electrochemical electrodes; electrochemistry; electron beam deposition; lithium; lithium compounds; manganese compounds; secondary cells; thin film devices; 0.3 to 4 mum; 3.8 to 5.3 V; 4.5 to 3.8 V; 5.1 V; 5.3 V; 700 to 800 C; Li-LiMn2O4; amorphous cathode films; annealing conditions; capacity losses; characterization; charging; crystalline spinel phase; deposition; electron beam evaporation; fabrication; secondary performance; thin-film rechargeable batteries; Amorphous materials; Annealing; Batteries; Cathodes; Crystallization; Current density; Laboratories; Lithium; Transistors; Voltage;
Conference_Titel :
Battery Conference on Applications and Advances, 1995., Proceedings of the Tenth Annual
Conference_Location :
Long Beach, CA
Print_ISBN :
0-7803-2459-5
DOI :
10.1109/BCAA.1995.398519
