Patent ID: 8168058

Claim:
An electrochemical method for manufacturing a lithium phosphate thin film, comprising: preparing an electrodeposition solution comprising about 10 −2 M to about 10 −1 M lithium ion and about 10 −2 M to about 1 M monohydrogen phosphate ion (HPO 4 2− ) or dihydrogen phosphate ion (H 2 PO 4 − ); immersing a conductive substrate in the electrodeposition solution and electrodepositing the lithium phosphate thin film on the conductive substrate under following parameters: an Ag/AgCl reference electrode; an electrodeposition voltage of about 950-1150 mV; and an electrodeposition time about 5-10 minutes; drying the lithium phosphate thin film with a drying temperature of about 15-40° C. and a relative humidity of at least about 75%; heating the lithium phosphate thin film from 23-27° C. to about 70-100° C. at a first heating rate of about 2° C. per minute for about 60-180 minutes; heating the lithium phosphate thin film to about 150-500° C. at a second heating rate of about 2° C. per minute for about 60-180 minutes; and cooling the lithium phosphate thin film to about 23-27° C. at a cooling rate of about 2° C. per minute.