title: Investigation of Co-incorporated pristine and Fe-doped Li3V2(PO4)3cathode materials for lithium-ion batteries.
abstract: Monoclinic Li3V2(PO4)3/C (LVP/C) and Li3V1.95Fe0.05(PO4)3/C (LVFP/C) composites were successfully modified by cobalt incorporation. The effects of cobalt incorporation on the structure, morphology and electrochemical performance of the LVP/C and LVFP/C composites were systematically investigated. The results show that most Co exists in the form of CoO and forms a hybrid layer with the carbon coating on the surface of the LVP and LVFP particles; moreover, a small part of Co enters into the LVP or LVFP lattices due to atomic diffusion. Compared with LVP/C and LVFP/C, Co-incorporated samples exhibit better electrochemical performance. In particular, under the common effect of doping and a hybrid layer (carbon and metal oxides) coating, the LVFP/C-Co electrode displays a prominent initial capacity of 124.7 mA h g-1and a very low capacity fading of ∼0.04% per cycle even after 500 cycles at 20 C. This novel co-modification method with cation doping and a hybrid layer (carbon and metal oxide) coating is a highly effective way to improve the electrochemical performance and has great potential to be easily used to modify other cathode materials with poor electrical conductivity.
authors.affiliation: College of Materials and Chemical Engineering, Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China. zlljoy@126.com xlyang@ctgu.edu.cn.
authors.forename: Hua-Bin
authors.initials: HB
authors.lastname: Sun
authors.forename: Lu-Lu
authors.initials: LL
authors.lastname: Zhang
authors.forename: Xue-Lin
authors.initials: XL
authors.lastname: Yang
authors.forename: Gan
authors.initials: G
authors.lastname: Liang
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li