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首页> 外文期刊>RSC Advances >Crystal growth kinetics, microstructure and electrochemical properties of LiFePO4/carbon nanocomposites fabricated using a chelating structure phosphorus source
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Crystal growth kinetics, microstructure and electrochemical properties of LiFePO4/carbon nanocomposites fabricated using a chelating structure phosphorus source

机译：使用螯合结构磷源制造的LiFePO4 /碳纳米复合材料的晶体生长动力学，微观结构和电化学性能

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摘要

LiFePO4/carbon (LFP/C) nanocomposites were fabricated using bis(hexamethylene triamine penta (methylene phosphonic acid)) (BHMTPMPA) as a new and environment-friendly phosphorus source. The activation energy of the fabricated LFP/C was first investigated in depth based on the theoretical Arrhenius equation and experimental results of the LFP/C composite particle size distribution to explore the grain growth dynamics of the LFP/C particles during the sintering process. The results indicate that the activation energy is lower than 3.82 kJ mol(-1) when the sintering temperature is within the range of 600-800 degrees C, which suggests that the crystal growth kinetics of the LFP/C particles is diffusion-controlled. The diffusion-controlled mechanism results from the mutual effects of chelation with Fe2+ cations, in situ formation of carbon layers and high concentration of hard aggregates due to the use of an organic phosphorous source (BHMTPMPA). The diffusion-controlled mechanism of the LFP/C effectively reduces the LFP particle size and hinders the growth of anomalous crystals, which may further result in nanosized LFP particles and good electrochemical performances. SEM and TEM analyses show that the prepared LFP/C has a uniform particle size of about 300 nm, which further confirms the effects of the diffusion-controlled mechanism of the LFP/C particle crystal growth kinetics. Electrochemical tests also verify the significant influence of the diffusion-controlled mechanism. The electrical conductivity and Li-ion diffusion coefficient (D-Li(+)) of the fabricated LFP/C nanocomposite are 1.56 x 10(-1) S cm(-1) and 6.24 x 10(-11) cm(2) s(-1), respectively, due to the chelating structure of the phosphorus source. The fabricated LFP/C nanocomposite exhibits a high reversible capacity of 166.9 mA h g(-1) at 0.2C rate, and presents an excellent rate capacity of 134.8 mA h g(-1) at 10C.
机译：的LiFePO 4 /碳（LFP / C）纳米复合材料使用双（六亚甲基三胺五（亚甲基膦酸））（BHMTPMPA）作为一种新的，环境友好型的磷源制造。的活化能制造LFP / C最早在深度研究基于理论Arrhenius方程和LFP / C复合材料的颗粒尺寸分布在烧结过程中，探索LFP / C粒子的晶粒生长动态的实验结果。结果表明，活化能低于3.82千焦耳摩尔（-1）时的烧结温度为600-800℃的范围内，这表明LFP / C颗粒的晶体生长动力学是扩散控制的范围内。从螯合与Fe2 +的阳离子，在碳层和硬的聚集体的高浓度的原位形成的相互影响的扩散控制的机制的结果，由于使用的有机磷源（BHMTPMPA）的。的LFP / C的扩散控制机制有效地降低了LFP颗粒尺寸和阻碍异常的晶体，这可以进一步导致纳米颗粒LFP和良好的电化学性能的生长。 SEM和TEM分析表明，制得的LFP / C具有约300nm的均匀的颗粒尺寸，这进一步证实了LFP / C颗粒晶体生长动力学的扩散控制机构的作用。电化学测试也验证了扩散控制机制的显著影响。导电性和锂离子扩散系数（d-李（+））的制造LFP / C纳米复合材料是1.56×10（-1）S厘米（-1）和6.24×10（-11）厘米（2） S（-1），分别，由于磷源的螯合结构。所制造的LFP / C纳米复合材料的展品166.9毫安ħ克（-1）以0.2C速率高的可逆容量，和礼物134.8毫安ħ克（-1）在10℃下极好的速率容量。

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  • 来源
    《RSC Advances》 |2018年第6期|共10页
  • 作者

    He Liping; Zha Wenke; Chen Dachuan;

  • 作者单位

    Hunan Univ Coll Mech &

    Vehicle Engn State Key Lab Adv Design &

    Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Mech &

    Vehicle Engn State Key Lab Adv Design &

    Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Civil Engn Changsha 410082 Hunan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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