Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Synthesis and Electrochemical Properties of LiFePO4 Cathode Material obtained by Electrospinning Method

전기방사법을 이용한 LiFePO4 양극 활물질의 합성 및 전기화학적 특성

  • Lee, Seung-Byung (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University) ;
  • Cho, Seung-Hyun (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University) ;
  • Park, Sun-Il (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University) ;
  • Lee, Wan-Jin (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University) ;
  • Lee, Yun-Sung (Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University)
  • 이승병 (전남대학교 응용화학공학부, 기능성 나노 신화학소재 사업단) ;
  • 조승현 (전남대학교 응용화학공학부, 기능성 나노 신화학소재 사업단) ;
  • 박선일 (전남대학교 응용화학공학부, 기능성 나노 신화학소재 사업단) ;
  • 이완진 (전남대학교 응용화학공학부, 기능성 나노 신화학소재 사업단) ;
  • 이윤성 (전남대학교 응용화학공학부, 기능성 나노 신화학소재 사업단)
  • Published : 2008.11.30
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Abstract

$LiFePO_4$ material was synthesized by electrospinning method to obtain optimal particle size($50{\sim}100\;nm$) without carbon coating or ball milling. This material showed an orthorthombic structure with Pnma space group without any impurities, such as FeP or $Fe_2P$, in the XRD pattern. The particle morphology and particle shape were observed by SEM analysis. Li/$LiFePO_4$ cell showed a high initial discharge capacity of 135 mAh/g, at current density of $0.1\;mA/cm^2$ with a cut-off voltage of 2.8 to 4.0V. This cell exhibited a perfect cycle performance over 99.9% cycle retention rate up to 50 cycles.

본 연구에서는 $LiFePO_4$의 입자크기를 조절함으로써 우수한 전극특성을 나타낼 수 있도록 최적의 입자크기($50{\sim}100\;nm$)를 가지는 $LiFePO_4$ 양극 활물질을 전기방사법을 이용하여 합성하였다. XRD 분석결과 FeP, $Fe_2P$ 등의 불순물이 존재하지 않는 Pnma의 공간군을 가지는 잘 발달된 사방정 구조의 $LiFePO_4$가 합성됨을 확인하였으며, SEM 분석을 통하여 시료의 입자형태 및 크기를 관찰하였다. $0.1\;mA/cm^2$의 전류밀도와 $2.8{\sim}4.0\;V$의 전위영역에서 충 방전 테스트 수행시 135 mAh/g의 초기 방전용량을 나타내었으며, 50 싸이클 후에도 99.9% 이상의 용량 보존율을 보이는 우수한 싸이클 특성을 나타내었다.

Keywords

References

  1. A. K. Padhi, K. S. Nanjundaswamy, and J. B. Goodenough, 'Phospho-olivines as Positive-Electrode Materials for Rechargeable Lithium Batteries' J.Electrochem. Soc., 144, 1188 (1997) https://doi.org/10.1149/1.1837571
  2. T. Ohzuku, A. Ueda, M. Nagayama, Y. Iwakoshi, and H. Komori, 'Comparative Study of $LiCoO_{2}LiNi_{1/2}Co_{1/2}O_{2}$ and $LiNiO_{2}$ for 4 volt Secondary Lithium Cells' Electrochim. Acta, 38, 1159 (1993) https://doi.org/10.1016/0013-4686(93)80046-3
  3. K. Striebel, J. Shim, A. Sierra, H. Yang, X. Y. Song, R. Kostecki, and K. McCarthy, 'The Development of LOw Cost $LiFePO_{4}$ -based High Power Lithium-ion Batteries' J. Power Sources, 146, 33 (2005) https://doi.org/10.1016/j.jpowsour.2005.03.119
  4. N. Ravet, Y. Chouinard, J. F. Magnan, S. Besner, M. Gauthier, and M. Armand, 'Electroactivity of Natural and Synthetic Triphylite' J. Power Sources, 97, 503 (2001) https://doi.org/10.1016/S0378-7753(01)00727-3
  5. P. P. Prosini, M. Lisi, D. Zane, and M. Pasquali, 'Determination of the Chemical Diffusion Coefficient of Lithium in $LiFePO_{4}$' Solid State Ionics, 148, 45 (2002) https://doi.org/10.1016/S0167-2738(02)00134-0
  6. A. S. Andersson, B. Kalska, and J. O. Thomas, 'Lithium Extraction / Insertion in $LiFePO_{4}$ : an X-ray Diffraction and Mossbauer Spectroscopy Study' Solid-State Ionics, 130, 41 (2000)1 https://doi.org/10.1016/S0167-2738(00)00311-8
  7. M. Gaberscek, R. Dominko, M. Bele, M. Remskar, D. Hanzel, and J. Jamnik, 'PoRous, Carbon-decorated $LiFePO_{4}$ Prepared by Sol-gel Method Based on Citric Acid' Solid-State Ionics, 176, 1801 (2005) https://doi.org/10.1016/j.ssi.2005.04.034
  8. C. Delacourt, P. Poizot, S. Levasseur, and C. Masquelier, 'Size Effects on Carbon-Free $LiFePO_{4}$ Powders The Key to Superior Energy Density' Electrochem. Solid-State Lett, 9, A352 (2006) https://doi.org/10.1149/1.2201987
  9. H. Huang, S.-C. Yin, and L. F. Nazar, 'Approaching Theoretical Capacity of $LiFePO_{4}$ at Room Temperature at High Rates' Electrochem. Solid-State Lett, 4, A170 (2001) https://doi.org/10.1149/1.1396695
  10. S. Yang, Y. Song, P. Y. Zavalij, and M. S. Whittingham, 'Reactivity, Stability and Electrochemical Behavior of Lithium Iron Phosphates' Electrochem. Commun, 4, 239 (2002)
  11. F. Croce, A. D. Epifanio, J. Hassoun, A. Deptula, T. Olczac, and B. Scrosati, 'A Novel Concept for the Synthesis of an Improved $LiFePO_{4}$ Lithium Battery Cathode' Electrochem. Solid-State Lett, 5, A47 (2002) https://doi.org/10.1149/1.1449302
  12. R. Dominko, J. M. Goupil, M. Bele, M. Gaberseek, M. Remskar, D. Hanzel, and J. Jamnik, 'Impact of the Carbon Coating Thickness on the Electrochemical Performance of $LiFePO_{4}$/C Composites' J. Electrochem. Soc., 152, A607 (2005) https://doi.org/10.1149/1.1860492
  13. A. D. Spong, G. Vitins, and J. R. Owen, 'A Solution- Precursor Synthesis of Carbon-Coated $LiFePO_{4}$ for Li-Ion Cells' J. Electrochem. Soc., 152, A2376 (2005) https://doi.org/10.1149/1.2120427
  14. G. X. Wang, S. Bewlay, J. Yao, J. H. Ahn, S. X. Dou, and H.K. Liu, 'Characterization of $LiM_{x}Fe_{1-x}PO_{4}$ (M=Mg, Zr, Ti) Cathode Materials Prepared by the Sol-Gel Method' Electrochem. Solid-State Lett, 7, A503 (2002) https://doi.org/10.1149/1.1819867
  15. D. Choi, and P. N. Kumta, 'Surfactant bAsed Sol-gel Approach To Nanostructured $Lifepo_{4}$ For High Rate Li-ion Batteries' J. Power Sources, 163, 1064 (2007) https://doi.org/10.1016/j.jpowsour.2006.09.082
  16. N. Yu, C. Shoa, Y. Liu, H. Guan, and X. Yang, 'Nanofibers of $LiMn_{2}O_{4}$ by electrospinning' J. Colloid and Interface Science, 285, 163 (2005) https://doi.org/10.1016/j.jcis.2004.11.014
  17. C. Shao, N. Yu, Y. Liu, and R. Mu, 'Preparation of $LiCoO_{2}$ Nanofibers by Electronning Technique' J. Physics and Chemistry of Solids, 67, 1423 (2006) https://doi.org/10.1016/j.jpcs.2006.01.104
  18. A. S. Andersson and J. O. Thomas, 'The Source Of Firstcycle Capacity Loss in $LiFePO_{4}$' J. Power Sources, 97, 498 (2001) https://doi.org/10.1016/S0378-7753(01)00633-4

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