Synthesis and Electrochemical Characteristics of Li₃V₂(PO₄)₃/C Cathode Materials for Li-Ion Batteries

Abstract:

Li₃V₂(PO₄)₃/C composites were synthesized by sol-gel routine with citric acid as chelates and carbon sources at different preparation conditions , meanwhile saccharose has been used to separate the Li₃V₂(PO₄)₃/C particles When it dissolve out in the process of solvent volatilizing. The effects of different preparation conditions and the existence of saccharose on crystal structure and electrochemical performance were characterized by XRD, SEM and electrochemical workstation. The results shows that all the Li₃ V₂ (PO₄)₃ samples are pure monoclinic phase; The crystal structure and the lattice parameters remain unchanged in different conditions, but it has effects on their average size of particles. The existence of saccharose suppress the growth of particle size and particle aggregation, and then affect electrochemical performances indirectly. In addition , the cycling performances of all samples displayed well at 3.0~4.2V on low rate charge/discharge, but the rate performance become worse with the increasing of average size of particle and particle aggregation and the capacity reduces seriously on high rate charge/discharge.

• Periodical: Advanced Materials Research (Volumes 912-914)
• Pages: 356-361
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.912-914.356
• Online since: April 2014
• Authors: Lu Zheng*, Hony Yuan Peng, Jian Hua Wang, Yu Zhong Guo
• Keywords: Cathode Material, Li₃ V₂ (PO₄)₃/C, Lithium-Ion Battery, Saccharose

References

[1] H. Huang, S. C. Yin, T. Kerr, N. Taylor, L.F. Nazar, Nanostructured composites: A high capacity, fast rate Li3V2 (PO4)3/carbon cathode for rechargeable lithium batteries, Advanced Materials, 2002, 14 (21): 1525-1528.

DOI: 10.1002/1521-4095(20021104)14:21<1525::aid-adma1525>3.0.co;2-3

[2] Saidi M Y, Barker J, Huang H, et a1, Performance characteristics of lithium vanadium phosphate as a cathode material for lithium-ion batteries, Journal Power Source, 2003, 119-121: 266-272.

DOI: 10.1016/s0378-7753(03)00245-3

[3] Li Li, Guohua Li, Shiquan Wang, et al , The preparation and performance study of Li3V2(PO4)3 , Chinese Journal of Inorganic Chemistry , 2010, 26 (1): 126-131.

[4] Li-ying Liu, Lian Chen, HaiYan Zhang, et al , Synthesis and Electrochemical Characteristics of Li3V2(PO4)3/C by sol-gel method , Electrochemistry, 2010, 16(4) : 450-453.

[5] Xiaodong Guo , Benhe Zhong, Yang Song, et al, Effects of Carbon Content on Lithium Vanadium Phosphate Cathode Materials, Rare Metal Materials and Engineering, 2011, 40 (1): 130-133.

[6] Morgan D, Ceder G, Saidi M Y, Experimental and computational study of the structure and electrochemical properties of Li3M2(PO4)3 compounds with the monoclinic and rhom bohedral structure, J Chem Mater , 2002, 14: 4684-4693.

DOI: 10.1021/cm020348o

[7] Franger S, Le C F, Bourgbon C, Comparison between different LiFePO4 synthesis routes and their influence on its physico-chemical properties , Journal Power Sources , 2003, 119: 252-257.

DOI: 10.1016/s0378-7753(03)00242-8

[8] Sato M, Ohkawa H, Yoshida K, et al, Enhancement of discharge capacity of Li3V2(PO4)3 by stabilizing the orthorhombic phase at room temperature , Solid State Ionic, 2000, 135: 137-142.

DOI: 10.1016/s0167-2738(00)00292-7

[9] Zhiyuan Tang, Wei Yuan, Ji Yan, et al, Preparation and performance research on Li3V2(PO4)3/C cathode materials doped with molybdenum element, Electrochemistry, 2012, 18 (2): 113-117.

[10] Zhu X J, Liu Y X, Geng L M, Synthesis and characteristics of Li3V2(PO4)3 as cathode materials for lithium-ion batteries, Solid State Ionics, 2008, 179 : 1679–1682.

DOI: 10.1016/j.ssi.2007.11.025

[11] Fu P, Zhao Y M, Dong Y Z, Low temperature solid-state synthesis routine and mechanism for Li3V2(PO4)3 using LiF as lithium precursor, Electrochemica Acta, 2006 , 52: 1003-1008.

DOI: 10.1016/j.electacta.2006.06.039