US EPA

7763087 

Journal Article 

Charge-transfer reaction at the lithium phosphorus oxynitride glass electrolyte/lithium manganese oxide thin-film interface and its stability on cycling 

Iriyama, Y; Nishimoto, K; Yada, C; Abe, T; Ogumi, Z; Kikuchi, K 

2006 

1 

Journal of Electrochemical Society
ISSN: 0013-4651
EISSN: 1945-7111 

ELECTROCHEMICAL SOC INC 

PENNINGTON 

153 

5 

A821-A825 

English 

10.1149/1.2178647 

WOS:000236516000003 

Charge-transfer reaction at a lithium manganese oxide (LiMn2 O4) thin-film electrode/lithium phosphorus oxynitride glass electrolyte (LiPON) interface was investigated using all-solid-state thin-film batteries (LiLiPON LiMn2 O4). X-ray diffraction measurements revealed that the crystal structure of the thin-film LiMn2 O4 electrode changed on depositing the LiPON thin-film electrode, but a thermal treatment at 498 K for 60 min re-formed the original crystal structure. The potential sweep curve of the thermally treated film battery was identical to the cyclic voltammogram of a LiMn2 O4 thin-film electrode in a conventional organic electrolyte (1 mol dm-3 LiClO4 dissolved in propylene carbonate). In contrast to a LiPON LiCoO2 interface, the charge-transfer resistance at the LiPON LiMn2 O4 interface did not decrease sufficiently after the thermal treatment relative to the charge-transfer resistance of the organic electrolyte LiMn2 O4 interface. This indicates that there should be a compatible electrode and LiPON film electrolyte combination to obtain an effective decrease in the charge-transfer resistance. Charge-discharge tests revealed that the resultant film battery repeated stable charge-transfer reaction on its cycling compared with the organic electrolyte system. Also, this electrochemical stability was maintained at a high temperature (333 K), which is probably because the formation of the LiMn2 O4 LiPON interface inhibited Mn dissolution from the LiMn2 O4 thin-film electrode. © 2006 The Electrochemical Society. All rights reserved.