Open AccessDelayed Rapid Anode Potential Decrease During Fixed Resistive Load Overdischarge of LiFePO4/Graphite Lithium-Ion Cells
Author(s) -
Kyle R. Crompton
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab8730
Subject(s) - anode , electrolyte , lithium (medication) , graphite , inorganic chemistry , materials science , oxygen , electrochemistry , chemistry , electrode , composite material , organic chemistry , medicine , endocrinology
A lithium-ion 0.7 mAh LiFePO 4 /graphite pouch cell with 1.0 M LiPF 6 ethylene carbonate:ethyl methyl carbonate 1:1 v/v electrolyte was overdischarged by application of a fixed resistive load for 336 h after cell conditioning. A rapid ( 1.8 V vs Li/Li + during overdischarge, although oxygen deposition on the anode does occur, 2) fluorine, oxygen and phosphorous increases on the anode surface are not observed when the fixed resistive load is removed before the rapid anode potential decrease and 3) fluorine, copper and oxygen deposition occur without cell recharge. Collectively, results indicate the rapid anode potential decrease is an oxidative breakdown of the electrolyte on the surface of the anode that is initiated by copper oxidation.