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纳米级橄榄石型LiFePO_4的可控合成 被引量：1

Controllable Synthesis of Nanoscale Olivine-type LiFePO_4
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摘要 以N,N-二甲基甲酰胺(DMF)/H2O为溶剂,FeSO4.7H2O,H3PO4和LiOH.H2O为原料,L-抗坏血酸(L-AA)为还原剂,溶剂热合成LiFePO4颗粒,为得到形貌规则的纳米级橄榄石型LiFePO4晶体,本文通过调节溶剂中DMF与H2O的比例,反应物浓度以及添加蔗糖来控制LiFePO4颗粒的形貌和尺寸。采用扫描电镜(SEM)和X射线衍射(XRD)对产物的形貌和晶体结构进行表征。结果表明,当溶剂中体积比DMF∶H2O=30∶10且FeSO4.7H2O浓度为0.05 mol/L(Fe∶P∶Li=1∶1∶3)时,可以得到规则的橄榄石型LiFePO4颗粒;此外,蔗糖的加入能够在一定程度上减小晶体的颗粒尺寸,并且当加入的蔗糖浓度为0.5 mg/mL时,得到尺寸为800 nm左右、分散性良好的正交晶系橄榄石型LiFePO4颗粒。 Olivine-type LiFePO4 was synthesized via solvothermal method, using N, N-dimethylformamide （DMF）/H20 as solvent, FeSO4· 7H20, H3PO4, LiOH · H20 as raw materials and L-ascorbic acid （L- AA） as the reductant. Regular nanoscale olivine-type LiFePO4 particles were obtained by adjusting the ratios of DMF to H20, the concentration of reactants and addition of sucrose. The morphology and structures of the composites were characterized by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The results indicated that the regular nanoscale olivine-type LiFePO4 particle could be synthesized when the ratio of DMF to H20 was 30： 10, the concentration of FeSO4 · 7H20 was 0.05 mol/L （ Fe： P： Li = 1 ： 1 ： 3 ） and concentration of additional sucrose was 0.5 mg/mL.
作者 庞瑞卿 杨永强 吴海霞
机构地区 上海交通大学微纳科学技术研究院
出处 《人工晶体学报》 EI CAS CSCD 北大核心 2013年第2期251-256,共6页 Journal of Synthetic Crystals
基金 国家自然科学青年基金(20906055)
关键词 LIFEPO4 溶剂热合成 形貌尺寸效应 LiFeP04 solvothermal synthesis morphology and size effects
分类号 TB34 [一般工业技术—材料科学与工程]
  • 相关文献

参考文献18

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二级参考文献12

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共引文献3

同被引文献17

  • 1Padhi A K /q K S, Goodenough J B. Phospho-olivines as Positive- Electrode Materials for Rechargeable Lithium Batteries[ J]. Journal of the Electrochemical Society, 1997,144 (4) : 1188.
  • 2Wang Z L, Su S R, Yu C Y, et al. Synthesises, Characterizations and Electrochemical Properties of Spherical-like LiFePO4 by Hydrothermal Method[J]. Journal of Power Sources,2008,184(2) :633-636.
  • 3Jiang J, Ouyang C Y, Li H, et al. First-principles Study on Electronic Structure of LiFePO4 [ J ]. Solid State Communications,2007,143 (3) : 144-148.
  • 4Xia Y G, Yoshio M, H N. Improved Electrochemical Performance of LiFePO4 by Increasing Its Specific Surface Area [ J ]. Electrechimica Acta, 2006,52 ( 1 ) : 240- 245.
  • 5Delaeourt C, Poizot P, Levasseur S, et al. Size Effects on Carbon- Free LiFePO4 Powders [ J ]. Electrochemical and Solid-State Letters, 2006,9(7) : A352-A355.
  • 6Herle P S, Ellis B, Coombs N, ct al. Nano-network Electronic Con- duction in Iron and Nickel Olivine Phosphates[ J]. Nature materials, 2004,3(3) :147-152.
  • 7Wang D Y, Li H, Shi S Q, et al. Improving the Rate Performance of LiFePO4 by Fe-site Doping[J]. Electroehimica Acta,2005,50(14) : 2955-2958.
  • 8Dominko R, Bele M, Gaberseek M, ct al. Impact of the Carbon Coat- ing Thickness on the Electrochemical Performance of LiFePO4/C Composites [ J ]. Journal of The Electrochemical Society, 2005,152 (3) :A607-A610.
  • 9Julien C M, Zaghib K, Manger A, et al. Characterization of the Car- bon Coating onto LiFePO4 Particles Used in Lithium Batteries [ J ]. Journal of Applied Physics, 2006,100 (6) : 63511 - 63517.
  • 10Hu ~ Q, Doeff M M, Kostecki R, et al. Electrochemical perform- ance of Sol-Gel synthesized LiFePO4 in lithium batteries[ J]. Journal of the Electrochemical Society,2004,15 l (8) : A1279-A1285.

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二级引证文献4

人工晶体学报
2013年 第2期

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