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Degradation of LiCoO 2 in aqueous lithium–air batteries
Author(s) -
Abdul Aziz Nur Azilina,
De Cunha Mabel,
Abdullah Tuti Katrina,
Mohamad Ahmad Azmin
Publication year - 2017
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.3625
Subject(s) - aqueous solution , lithium (medication) , degradation (telecommunications) , electrochemistry , cobalt oxide , cathode , cyclic voltammetry , dissolution , diffusion , materials science , lithium cobalt oxide , cobalt , cathodic protection , redox , oxide , anode , chemical engineering , analytical chemistry (journal) , electrode , chemistry , battery (electricity) , lithium ion battery , metallurgy , thermodynamics , chromatography , electrical engineering , medicine , physics , power (physics) , engineering , endocrinology
Summary The degradation behaviour of aqueous rechargeable lithium cobalt oxide–air batteries in 5 M LiNO 3 aqueous solution is observed by electrochemical characterizations. At lower scan rates of cyclic voltammetry, the three pairs of redox peaks at E SCE = 0.79/0.67, 0.89/0.85 and 1.15/0.97 V are proven to produce good reversibility. The small separation of the peaks is proportionally consistent with the Li + diffusion coefficients of 2.82 × 10 −7 cm 2 s −1 (anodic) and 1.76 × 10 −7 cm 2 s −1 (cathodic). The lithium cobalt oxide–air batteries have a higher initial specific discharge capacity of 114.35 mA h g −1 , which fades to 83% (after the first 10 cycles) and 52% (after 50 cycles). As the specific discharge capacity decreases, the resistance increases. The dissolution of Li + is mainly attributed to these degradations. Further analyses of the batteries' degradation are performed by morphological and structural characterizations of the cathode material. Copyright © 2016 John Wiley & Sons, Ltd.