Bio-assisted synthesis of mesoporous Li3V2(PO4)3 for high performance lithium-ion batteries

W. He, X.D. Zhang, X.Y. Du, Y. Zhang, Yuanzheng Yue, S.J. Shen, M. Li

Research output: Contribution to journalJournal articleResearchpeer-review

29 Citations (Scopus)

Abstract

The mesoporous biocarbon coated Li3V2(PO4)3(MBC-LVP) cathode material is synthesized by abiotemplate-assisted sol–gel reaction process using low-cost beer waste brewing yeasts (BWBYs) as bothstructural template and biocarbon source. The structure and electrochemical performances of MBC-LVPwere investigated using Raman spectra, thermogravimetric measurements (TGA), adsorption–desorptionisotherms and pore-size-distribution curves, X-ray diffraction (XRD), transmission electron microscope(TEM and HRTEM), and electrochemical methods. The results show that the MBC-LVP synthesized at750C has a hierarchical nanostructure, which consist of Li3V2(PO4)3crystal nanoparticles and amor-phous biocarbons network (11.5%) with hierarchical mesoporous structures (slit shape mesopores, openwormlike mesopores and plugged mesopores). This hierarchical nanostructure facilitates electron andlithium ion diffusion. The MBC-LVP electrode has high discharge capacity (about 205 mAh g−1) at a cur-rent density of 0.2 C in the voltage region of 3.0–4.8 V and the diffusion coefficient of Li+-ions determinedby CV and EIS is higher than those of olivine LiFePO4. We have revealed the formation mechanism of MBC-LVP, the possible lithium pathways in the MBC-LVP and established a relation between the structure andthe ionic and electronic transport properties.

Original languageEnglish
JournalElectrochimica Acta
Volume112
Pages (from-to)295–303
Number of pages9
ISSN0013-4686
DOIs
Publication statusPublished - 2013

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