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首页> 外文期刊>Materials Science and Engineering >High-rate performance of xLiFePO_4·yLi_3V_2(PO_4)_3/C composite cathode materials synthesized via polyol process
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High-rate performance of xLiFePO_4·yLi_3V_2(PO_4)_3/C composite cathode materials synthesized via polyol process

机译：多元醇法合成xLiFePO_4·yLi_3V_2（PO_4）_3 / C复合正极材料的高效率

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摘要

xLiFePO_4·yLi_3V_2(PO_4)_3/C composite cathode materials were synthesized via a polyol process, using LiOH·H_2O, Fe_3(PO_4)_z·8H_2O, V_2O_5 and H_3PO_4 as raw materials, citric acid and PEG as carbon sources, and TEG as both a solvent and a reductant. Structural and morphological characterizations of as-prepared materials were carried out by X-ray diffraction (XRD) as well as scanning electron microscopy (SEM), respectively. Furthermore, electrochemical properties of as-prepared materials were analyzed by charge-discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (E1S). XRD results indicated that the composites consisting of an olivine phase of LiFePO_4 and a monoclinic phase of Li_3V_2(PO_4)_3 are well-crystallized. It is found that the LF_(0.3)P·LV_(0.4)P/C composite exhibited better electrochemical performance than pristine LFP/C and LVP/C at 5C and IOC rate and delivered 126mAhg~(-1) and 110 mAh g~(-1), respectively. The favorable particles morphology with less than 100 nm size and low extent agglomeration is believed as a factor. In addition, the co-existence of V~(3+)-doped LiFePO_4/C and Fe~(2+)-doped Li_3V_2(PO_4)_3/C was supposed as another reason.
机译：以LiOH·H_2O，Fe_3（PO_4）_z·8H_2O，V_2O_5和H_3PO_4为原料，柠檬酸和PEG为碳源，TEG为多元醇，通过多元醇法合成xLiFePO_4·yLi_3V_2（PO_4）_3 / C复合阴极材料。既是溶剂又是还原剂。所制备材料的结构和形态表征分别通过X射线衍射（XRD）和扫描电子显微镜（SEM）进行。此外，通过充放电测试，循环伏安法（CV）和电化学阻抗谱（E1S）分析了所制备材料的电化学性能。 XRD结果表明，由LiFePO_4的橄榄石相和Li_3V_2（PO_4）_3的单斜晶相组成的复合材料结晶良好。结果表明，LF_（0.3）P·LV_（0.4）P / C复合材料在5C和10C速率下比原始的LFP / C和LVP / C表现出更好的电化学性能，并输送126mAhg〜（-1）和110mAh g〜。 （-1）。认为具有小于100nm尺寸和低程度团聚的有利的颗粒形态是一个因素。此外，另一个原因是掺有V〜（3+）的LiFePO_4 / C和掺有Fe〜（2+）的Li_3V_2（PO_4）_3 / C。

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  • 来源
    《Materials Science and Engineering》 |2013年第4期|272-276|共5页
  • 作者

    Chao Gao; Heng Liu; Guobiao Liu; Jun Zhang; Wei Wang;

  • 作者单位

    College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China;

    College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China;

    College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China;

    College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China;

    College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China;

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  • 正文语种 eng
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  • 关键词

    xLiFePO_4·yLi_3V_2(PO_4)_3/C; polyol process; cathode materials; lithium ion battery;

    机译：xLiFePO_4·yLi_3V_2（PO_4）_3 / C;多元醇工艺阴极材料;锂离子电池;

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