Title :
Thin-film Li-LiMn2O4 batteries
Author :
Bates, J.B. ; Lubben, D. ; Dudney, N.J.
Author_Institution :
Oak Ridge Nat. Lab., TN, USA
fDate :
4/1/1995 12:00:00 AM
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 0.3to 4-μm thick were annealed at 700/spl deg/C to 800/spl deg/C in oxygen in order to form the crystalline spinet phase. The specific capacity of the cells between 4.5 V to 3.8 V 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 1 Li/Mn2O4.
Keywords :
annealing; electron beam deposition; lithium; lithium compounds; order-disorder transformations; secondary cells; thin film devices; vapour deposited coatings; 0.3 to 4 mum; 3.8 to 5.3 V; 4.5 to 3.8 V; 5.3 V; 700 to 800 C; Li-LiMn/sub 2/O/sub 4/; Li-LiMn/sub 2/O/sub 4/ batteries; amorphous as-deposited cathode films; annealing; capacity losses; crystalline spinet phase; electron beam evaporation; low current electronic devices; secondary performance; thin-film rechargeable batteries; total charge; Aerospace and Electronic Systems Society; Amorphous materials; Annealing; Batteries; Cathodes; Crystallization; Current density; Lithium; Transistors; Voltage;
Journal_Title :
Aerospace and Electronic Systems Magazine, IEEE
