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稀土金屬離子摻雜對(duì)LiFePO4結(jié)構(gòu)和性能的影響
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湖南省科技計(jì)劃項(xiàng)目(2010GK3152)；湖南省教育廳優(yōu)秀青年基金項(xiàng)目(09B024)


Effect of Rare Earth Ions Doping on the Structure and Performance of LiFePO4
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    摘要:

    采用稀土金屬離子 (Er3+、Y3+、Nd3+)分別對(duì)LiFePO4的Li、Fe原子位進(jìn)行摻雜，通過X射線衍射 (XRD)、恒電流充放電及電化學(xué)阻抗(EIS)法系統(tǒng)地研究摻雜對(duì)LiFePO4結(jié)構(gòu)和性能的影響。結(jié)果表明：摻雜試樣的微觀結(jié)構(gòu)和性能與摻雜離子半徑、取代位置密切相關(guān)。LiFe0.99Y0.01PO4試樣具有最佳的電化學(xué)性能，在15 mA·g-1放電電流密度下首次放電容量達(dá)到149.8 mAh·g-1，當(dāng)電流密度增加到300 mA·g-1時(shí)，放電容量為134.3 mAh·g-1，經(jīng)過50次循環(huán)充放電后，放電容量保持率為99.1%

    Abstract:

    Li and Fe atom sites of LiFePO4 were doped by rare earth ions (Er3+, Y3+, Nd3+), respectively. The change of structure and performance of LiFePO4 was investigated by XRD, galvanostatic charge and discharge experiments and electrochemical impedance tests. The results show that the microstructure and performance of doped samples are interrelated with radii of doping ions and doping site. LiFe0.99Y0.01PO4 displays the excellent electrochemical performance. Its initial discharge capacity is 149.8 mAh·g-1 under the current density of 15 mA·g-1. When 300 mA·g-1 current is applied, its discharge capacity is 134.3 mAh·g-1. Its capacity retention is 99.1% after 50 cycles.

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陳 晗,向楷雄,龔文強(qiáng),劉建華.稀土金屬離子摻雜對(duì)LiFePO4結(jié)構(gòu)和性能的影響[J].稀有金屬材料與工程,2011,40(11):1936~1940.[Chen Han, Xiang Kaixiong, Gong Wenqiang, Liu Jianhua. Effect of Rare Earth Ions Doping on the Structure and Performance of LiFePO4[J]. Rare Metal Materials and Engineering,2011,40(11):1936~1940.]
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  • 收稿日期:2010-11-30
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