Synthesis and electrochemical performance of 0.6Li3V2(PO4)3·0.4Li–V–O composite cathode material for lithium ion batteries. (10th April 2015)

• Record Type: Journal Article
• Authors: Li, Y.; Bai, W.Q.; Wang, D.H.; Niu, X.Q.; Zhang, Y.D.; Tang, H.; Wang, X.L.; Gu, C.D.; Tu, J.P.
• Is Part Of: Electrochimica acta. Volume 161(2015)
• Page Start: 252
• Page End: 260
• Publication Date: 2015-04-10
• Subjects: Lithium vanadium phosphate -- Lithium vanadium oxide -- Composite cathode -- Diffusion coefficient -- Lithium ion battery; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.02.073
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: A novel 0.6Li3 V2 (PO4 )3 ·0.4Li–V–O composite cathode material is synthesized by sol-gel method followed by solvothermal and solid state reaction. The morphology and structure of the composite are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photo-electron spectroscopy (XPS). The composite particles are well-crystallized and present uniform nanoplate alike. Except Li3 V2 (PO4 )3 phase, LiV2 O5 and VO2 are also present in the composite. The 0.6Li3 V2 (PO4 )3 ·0.4Li–V–O electrode delivers a discharge capacity of 149.3 mAh g −1 at 50 mAg −1 between 2.0 V and 4.3 V, and has higher rate property than Li3 V2 (PO4 )3 . The diffusion coefficients of Li ions in the composite are in the range of 10 −9.5 − 10 −7.5 cm 2 s −1 obtained from galvanostatic intermittent titration technique (GITT).