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Effects of Fe2+ ion doping on LiMnPO4 nanomaterial for lithium ion batteries

机译:Fe2 +离子掺杂对锂离子电池Limnpo4纳米材料的影响

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摘要

To improve the electrochemical performance of LiMnPO4, a modified polyol reaction has been successfully developed for the preparation of LiMnxFe1-xPO4/C samples (x = 0.2, 0.5, 0.8). The secondary particles of the acquired LiMnxFe1-xPO4/C samples are spherical or annular, and the primary particles are nano-sized (20-80 nm). The LiMn0.8Fe0.2PO4/C has a higher energy density of 637 W h kg(-1) compared with LiMn0.2Fe0.8PO4/C (575 W h kg(-1)) and LiMn0.5Fe0.5PO4/C (584 W h kg(-1)). The TEM image shows that the primary particles of LiMn0.8Fe0.2PO4/C are uniformly covered by a 3 nm carbon layer, and it can deliver a high discharge capacity of 161 mA h g(-1) at 0.05C. At a 0.5C discharge rate, the LiMn0.8Fe0.2PO4/C can maintain 80.4% of its initial capacity after 900 cycles, and it also maintains 90% and 83% of its initial capacity at 45 degrees C and 55 degrees C respectively after 100 cycles. The results demonstrate that the modified polyol process is feasible for Fe-doping and carbon-coating to enhance the electrochemical performance of LiMnPO4.
机译:为了提高LiMnPO4的电化学性能,已成功开发改性多元醇反应以制备LiMnXFe1-XPO4 / C样品(x = 0.2,0.5,0.8)。所获得的LiMnxFe1-XPO4 / C样品的二次颗粒是球形的或环形的,并且初级颗粒是纳米大小(20-80nm)。与LiMn0.2Fe0.8PO4 / C(575WH kg(-1))和LiMn0.5Fe0.5po4 / c相比,LiMn0.8Fe0.2PO4 / C具有637WH kg(-1)的能量密度为637WH kg(-1)。 584 W H kg(-1))。 TEM图像表明,LiMn0.8Fe0.2PO4 / C的主要颗粒均匀地覆盖3nm碳层,可在0.05℃下提供161mA H G(-1)的高放电容量。在0.5℃放电速率下,900次循环后,LiMn0.8Fe0.2PO4 / C可以保持其初始容量的80.4%,并且在45摄氏度下,它也将其初始容量的90%和83%保持在55℃ 100周期。结果表明,改性多元醇过程可用于Fe-掺杂和碳涂层,以提高LiMnPO4的电化学性能。

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  • 来源
    《RSC Advances》 |2016年第32期|共6页
  • 作者单位

    Tianjin Univ Sch Chem Engn Tianjin 300072 Peoples R China;

    Tianjin Inst Power Sources Natl Key Lab Power Sources Tianjin 300384 Peoples R China;

    Tianjin Inst Power Sources Natl Key Lab Power Sources Tianjin 300384 Peoples R China;

    Tianjin Inst Power Sources Natl Key Lab Power Sources Tianjin 300384 Peoples R China;

    Tianjin Inst Power Sources Natl Key Lab Power Sources Tianjin 300384 Peoples R China;

    Tianjin Univ Sch Chem Engn Tianjin 300072 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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