caa a22 4500 463227581 CHVBK 20180405153231.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s10853-006-0905-y doi (NATIONALLICENCE)springer-10.1007/s10853-006-0905-y Iron-based composite oxides as alternative negative electrodes for lithium-ion batteries [Elektronische Daten] [I. Uzunov, S. Uzunova, D. Kovacheva, S. Vasilev, B. Puresheva] Nanosized lithiated iron oxides with 10 and 50wt.% SiO2 were prepared by a sol-gel method using 1M Fe(NO3)3·9H2O and 1M LiNO3 aqueous solutions in a stoichiometric ratio of 1:1 and colloidal silica. Dried xerogel was calcinated at 700°C for 4h in air. The X-ray data of samples synthesized using 10% and 50% SiO2 showed the presence of a mixture of two phases: α-LiFeO2 and Li1−x Fe5O8 (0<x≤0.1) for a sample containing 10% SiO2 and LiFe(SiO3)2 and Fe2O3 (h) for a sample with 50% SiO2. The electrochemical behaviour of the compounds was investigated galvanostatically within the 0.01-3.0V range at a current density of 0.80mAcm−2. The Li/Li x Fe y O z (10%)·SiO2 cell showed a high initial reversible capacity of 1,080mAhg−1 and a capacity of 600mAhg−1 at the 30th cycle. Accounting these results is the presence of a SiO2 phase which stabilizes the structure of the active mass on cycling. The mean charge voltage (1.8V) and the discharge voltage of 1.0V versus Li+ reference electrode as well as the high reversible capacity indicate that this material is suitable for use as anode in lithium-ion batteries. Springer Science+Business Media, LLC, 2007 Uzunov I. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut Uzunova S. Institute of Electrochemistry and Energy Systems (Former CLEPS), Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut Kovacheva D. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut Vasilev S. Institute of Electrochemistry and Energy Systems (Former CLEPS), Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut Puresheva B. Institute of Electrochemistry and Energy Systems (Former CLEPS), Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/10(2007-05-01), 3353-3357 0022-2461 42:10<3353 2007 42 10853 https://doi.org/10.1007/s10853-006-0905-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0905-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Uzunov I. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Uzunova S. Institute of Electrochemistry and Energy Systems (Former CLEPS), Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Kovacheva D. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Vasilev S. Institute of Electrochemistry and Energy Systems (Former CLEPS), Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Puresheva B. Institute of Electrochemistry and Energy Systems (Former CLEPS), Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/10(2007-05-01), 3353-3357 0022-2461 42:10<3353 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer