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Core–shell Ni0.5TiOPO4/C composites as anode materials in Li ion batteries
Authors:XJ Zhang  Y Zhang  Z Zhou  JP Wei  R Essehli  B El Bali
Affiliation:aInstitute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China;bSUBATECH, Unité Mixte de Recherche 6457, École des mines de Nantes, CNRS/IN2P3, Université de Nantes, BP 20722, 44307 Nantes cedex 3 France;cLaboratory of Mineral Solid and Analytical Chemistry “LMSAC”, Department of Chemistry, Faculty of Sciences, University Mohamed I, PO Box 624, 60000 Oujda, Morocco
Abstract:Pristine Ni0.5TiOPO4 was prepared via a traditional solid-state reaction, and then Ni0.5TiOPO4/C composites with core–shell nanostructures were synthesized by hydrothermally treating Ni0.5TiOPO4 in glucose solution. X-ray diffraction patterns indicate that Ni0.5TiOPO4/C crystallizes in monoclinic P21/c space group. Scanning electron microscopy and transmission electron microscopy show that the small particles with different sizes are coated with uniform carbon film of ∼3 nm in thickness. Raman spectroscopy also confirms the presence of carbon in the composites. Ni0.5TiOPO4/C composites presented a capacity of 276 mAh g−1 after 30 cycles at the current density of 42.7 mA g−1, much higher than that of pristine Ni0.5TiOPO4 (155 mAh g−1). The improved electrochemical performances can be attributed to the existence of carbon shell.
Keywords:Ni0  5TiOPO4/C  Lithium-ion batteries  Core&ndash  shell  Anode materials
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