A.C. impedance studies of the lithium/polymer electrolyte interface in solid-state lithium cells

✍ Scribed by C.C. Hunter; D.C. Sinclair; A.R. West; A. Hooper

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 468 KB
• Volume: 24
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(88)80099-5

✦ Synopsis

Cells containing either LiClO,/poly(ethylene oxide) or LiCF,SO,/ poly(ethylene oxide) complexes as the electrolyte with lithium metal and/or V601s-based composite electrodes have been assembled and their a.c. impedance measured at temperatures in the range of room temperature to 120 "c.

Two resistances are identified from the equivalent circuit analysis. One is attributed to the polymer and shows a characteristic, non linear, Arrhenius plot with a change in slope at about 70 "C. The other is attributed to the lithium/polymer interface and gives an essentially linear Arrhenius plot. The magnitude of this second resistance in Li/V,Ois cells decreases during an initial period of open circuit voltage stabilisation from about 3.5 to 3.2 V. Possible origins of this second resistance are discussed.