Mo doping of layered Li (NixMnyCo1-x-y-zMz)O-2 cathode materials for lithium-ion batteries


PİŞKİN B., Uygur C. S. , AYDINOL M. K.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, vol.42, no.12, pp.3888-3898, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 12
  • Publication Date: 2018
  • Doi Number: 10.1002/er.4121
  • Journal Name: INTERNATIONAL JOURNAL OF ENERGY RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3888-3898
  • Keywords: doping, layered cathode materials, Li-ion batteries, rate capability and cycle life, spray pyrolysis, DEGRADATION MECHANISMS, XPS DETERMINATION, OXIDE CATHODE, RICH, SPECTROSCOPY, CHALLENGES, OXIDATION
  • Middle East Technical University Affiliated: Yes

Abstract

We systematically investigated the effects of Mo doping on the structure, morphology, and the electrochemical performance of Li (NixMnyCo1-x-y-zMz)O-2 (NMC) cathode materials for Li-ion batteries. Layered NMC cathodes were synthesized with the ratio of 111, 622, and 226 via spray pyrolysis yielding submicron-sized aggregates in the shape of hollow spherical particles. We performed X-ray diffraction analyses to determine the present phases and the ordering in structure. X-ray diffraction pattern of Mo-doped 111, 226, and 622 cathodes showed well-defined [006]/[102] and [108]/[110] doublets, indicating the layered structure, and good hexagonal ordering. Galvanostatic charge/discharge and electrical impedance spectroscopy measurements were carried out to reveal the effect of Mo doping on the electrochemical performance of the cathodes. Charge/discharge measurements after 20cycles indicated that the Mo-doped 111 and 622 NMC cathodes performed a capacity retention of 80% and 81% respectively. Present findings reveal the stabilization effect of Mo in layered NMC structure, especially in the case of Ni-rich NMC cathodes.