2026-04-23T00:23:24Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/113662026-02-17T11:22:54Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

00925njm 22002777a 4500 dc Ventosa Arbaizar, Edgar author Xia, Wei author Klink, Stefan author La Mantia, Fabio author Muhler, Martin author Schuhmann, Wolfgang author 2012-01 Commercial carbon cloth made of PAN-based carbon fibres was used as free-standing anode for lithium intercalation. The role of surface functional groups on the specific irreversible charge loss and reversible charge during the intercalation and de-intercalation of lithium ions into carbon cloth has been investigated. Oxygen groups have been introduced by nitric acid vapour treatment and subsequently gradually removed by thermal treatment at different temperatures in He or H2 atmosphere as confirmed by X-ray photoelectron spectroscopy. A clear correlation between the amount of surface-bound oxygen groups and the irreversible specific charge was observed. Three irreversible processes were distinguished during the first cathodic scan: (i) reduction of oxygen groups, (ii) formation of the solid electrolyte interphase (SEI) and (iii) presumably exfoliation. The latter one was only observed for samples with low surface oxygen concentration, and its contribution to the irreversible capacity was small due to the low graphitization degree of the samples. An increased specific reversible charge upon increasing the amount of oxygen-containing groups was observed with the main improvement above 1.5 V. 0013-4686 https://hdl.handle.net/10259/11366 10.1016/j.electacta.2011.12.128 Carbon cloth Surface electrochemistry Lithium batteries Exfoliation SEI formation Influence of surface functional groups on lithium ion intercalation of carbon cloth