Synthesis and characterization of carbon-coated Li0.5Ni0.25TiOPO4 anode material
2009 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 0019-4686, Vol. 54, no 23, 5531-5536 p.Article, review/survey (Refereed) Published
Li0.5Ni0.25TiOPO4/C composite was synthesized by the co-precipitation method using polyethylene glycol as carbon source. X-ray diffraction study showed that the as-prepared material crystallizes in the monoclinic system (S.G. P21/c). This 3D structure exhibits an open framework favourable to intercalation reactions. The morphology and the microstructure characterisation was performed by scanning electron microscopy (SEM). Small particles (1 μm) coated by carbon were observed. Raman study confirms the presence of carbon graphite in the Li0.5Ni0.25TiOPO4/C composite. Cyclic voltammetry (CV) and charge–discharge galvanostatic cycling were used to characterize its electrochemical properties. The Li0.5Ni0.25TiOPO4/C composite exhibits excellent electrochemical performances with good capacity retention for 50 cycles. Approximately 200 mAh/g could be reached at C, C/2, C/5 and C/20 rates in the 0.5–3 V potential range. These results clearly evidenced the positive effect of the carbon coating on the electrochemical properties of the studied phosphate.
Place, publisher, year, edition, pages
Elsevier Ltd , 2009. Vol. 54, no 23, 5531-5536 p.
Lithium nickel oxyphosphate, Lithium ion batteries, Carbon coating, Raman spectroscopy
Research subject Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-108447DOI: 10.1016/j.electacta.2009.04.053ISI: 000268518500030OAI: oai:DiVA.org:uu-108447DiVA: diva2:235883
Department of Materials Chemistry, Uppsala University, Box 538, SE-75121 Uppsala, Sweden2009-09-182009-09-182011-01-19Bibliographically approved