Investigation of Co-incorporated pristine and Fe-doped Li3V2(PO4)3 cathode materials for lithium-ion batteries. Issue 39 (15th August 2016)

• Record Type: Journal Article
• Authors: Sun, Hua-Bin; Zhang, Lu-Lu; Yang, Xue-Lin; Liang, Gan; Li, Zhen
• Is Part Of: Dalton transactions. Volume 45:Issue 39(2016)
• Page Start: 15317
• Page End: 15325
• Publication Date: 2016-08-15
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c6dt02058e
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Co was first employed to modify Fe-doped Li3 V2 (PO4 )3 /C. Under the common effect of doping and a hybrid layer (C + CoO + FeO) coating, the as-obtained composite showed a remarkable rate capability and low capacity fading. Abstract : Monoclinic Li3 V2 (PO4 )3 /C (LVP/C) and Li3 V1.95 Fe0.05 (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 −1 and 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.