Synthesis, Characterization and Electrochemical Performance of Nb Doped LiFePO4/C Cathodes by Mechanochemical Activation

Year 2018, Volume: 5 Issue: 1, 49 - 55, 28.03.2018

Cengiz Bagci , Oncu Akyildiz

https://doi.org/10.17350/HJSE19030000077

Cited By: 2

Abstract

We synthesized Nb-doped LiFePO4 /C nano composite cathode materials by mechanochemical activation followed by a single step calcination. The starting chemicals of Li2 CO3 , FeC2 O4 .2H2O, NH4 H2 .PO4 and C6 H8 O7 as lithium, iron, phosphate, and carbon sources are mixed in a high energy ball mill 250 rpm, 5h and calcined at 650 °C and 10 hours. The resultant materials are structurally XRD, SEM, TEM and electrochemically characterized and high purity LiFePO4 with high electrochemical performance is obtained. Voltage vs. specific capacity, discharge capacity vs. cycle number in manufactured battery is presented. An initial specific discharge capacity of 153 mAhg−1 and a specific discharge capacity of 128.4 mAhg−1 after the 8th charge/discharge cycling at 1C is recorded.

Keywords

LiFePO4, Lithium ion battery, Mechanochemical activation, Nb doping

References

• Ma Z, Shao G, Wang G, Zhang Y and Du J. Effects of Nb- doped on the structure and electrochemical performance of LiFePO4/C composites. Journal of Solid State Chemistry 210 (1) (2014) 232–237.
• Zhang, Q, Wang S, Zhou Z, Ma G, Jiang W, Guo X, Zhao S. Structural and electrochemical properties of Nd-doped LiFePO4/C prepared without using inert gas. Solid State Ionics 191 (2011) 40–44.
• Zhuang D, Zhao X, Xie J, Tu J, Zhu T, Cao G. One-step Solid- state Synthesis and Electrochemical Performance of Nb- doped LiFePO4/C. ActaPhys.Chim.Sin. 22 (2006) 840–844.
• Morales J, Trócoli R, Rodríguez-Castellón E, Franger S, Santos-Peña J. Effect of C and Au additives produced by simple coaters on the surface and the electrochemical properties of nanosized LiFePO4. Journal of Electroanalytical Chemistry 63 (2009) 29–35.
• Suo L, Han W, Lu X, Gu L, Hu YS, Li H, Chen D, Chen L, Tsukimoto S and Ikuhara Y. Highly ordered staging structural interface between LiFePO4 and FePO4. Phys Chem Chem. Phys. 14 (2012) 5363-5367.
• Zhang D, Yu X, Wang Y, Cai R, Shao Z, Liao X-Z, and Ma Z-F. Ball milling-assisted synthesis and electrochemical performance of LiFePO4/C for lithium-ion battery adopting citric acid as carbon precursor. Journal of the Electrochemical Society 156 (10) (2009) A802- A808.
• Li M, Xie K, Li D, and Pan Y. Synthesis of LiFePO4 by one- step annealing under the vacuum condition. Journal of Materials Science 40 (2005) 2639–2641.
• Kim J-K, Choi J-W, Chauhan GS, Ahn J-H, Hwang G-C, Choi J-B and Ahn H-J. Enhancement of electrochemical performance of lithium iron phosphate by controlled sol–gel synthesis. Electrochimica Acta 53 (28) (2008) 8258–8264.
• Koltypin M, Aurbach D, Nazar L and Ellis B. More on the performance of LiFePO4 electrodes—the effect of synthesis route, solution composition, aging, and temperature. Journal of Power Sources 174 (2) (2007) 1241–1250.
• Kosova N, Devyatkina E. On mechanochemical preparation of materials with enhanced characteristics for lithium batteries. Solid State Ionics 172 (1-4) (2004) 181–184.
• Lee J, Kumar P, Lee G, Moudgil BM and Singh RK. Electrochemical performance of surfactant-processed LiFePO4 as a cathode material for lithium-ion rechargeable batteries. Ionics, 19(2) (2012) 371–378.
• Ojczyk W, Marzec J, Świerczek K, Zając W, Molenda M, Dziembaj R and Molenda J. Studies of selected synthesis procedures of the conducting LiFePO4-based composite cathode materials for li-ion batteries. Journal of Power Sources 173(2) (2007) 700–706.
• Fey GTK, Chen YG and Kao HM. Electrochemical properties of LiFePO4 prepared via ball-milling. Journal of Power Sources 189 (1) (2009) 169–178.
• Fey GTK and Lu TL. Morphological characterization of LiFePO4/C composite cathode materials synthesized via a carboxylic acid route. Journal of Power Sources 178 (2) (2008) 807–814.
• Yun NJ, Ha HW, Jeong KH, Park HY and Kim K. Synthesis and electrochemical properties of olivine-type LiFePO4/C composite cathode material prepared from a poly(vinyl alcohol)-containing precursor. Journal of Power Sources 160 (2) (2006) 1361–1368.
• Wang D, Li H, Wang Z, Wu X, Sun Y, Huang X and Chen L. New solid state synthesis routine and mechanism for LiFePO4 using LiF as lithium precursor. Journal of Solid State Chemistry, 177(12) (2004) 4582–4587.
• Lv YJ, Su J, Long YF, Cui XR, Lv XY and Wen YX. Effects of ball-to-powder weight ratio on the performance of LiFePO4/C prepared by wet-milling assisted carbothermal reduction. Powder Technology 253 (2014) 467–473.
• Chen Z, Ren Y, Qin Y, Wu H, Ma S, Ren J, He X, Sun YK, Amine K. Solid state synthesis of LiFePO4 studied by in situ high energy x-ray diffraction. Journal of Materials Chemistry 21(15) (2011) 5604–5609.
• Kayyar A, Huang J, Samiee M, Luo J. Construction and testing of coin cells of lithium ion batteries. J Vis Exp 66 (e4104) (2012) 1–5.
• Kim HS, Kam DV, Kim VS, Koo HJ. Synthesis of the LiFePO4 by a solid-state reaction using organic acids as a reducing agent. Ionics 17 (4) (2011) 293–297.