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Nb摻雜LiFePO4電子結(jié)構(gòu)的第一性原理研究
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國家自然科學(xué)基金(50874074,51110105014,50474092);廣東省自然科學(xué)基金(8151806001000028);深圳市科技計劃(200505,ZYC200903250150A)與深圳市功能高分子重點實驗室開放基金(FP20110004,F(xiàn)P20120004)


First-Principles Study of Electronic Structure of Nb-Doped LiFePO4
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    摘要:

    采用基于DFT的第一性原理方法,研究Nb摻雜LiFePO4鋰離子電池正極材料的電子結(jié)構(gòu),并進行能帶結(jié)構(gòu)、電子態(tài)密度、布居和差分電荷密度性質(zhì)等分析。結(jié)果表明:Nb摻雜后體系結(jié)構(gòu)穩(wěn)定,帶隙降低,由于Nb d軌道電子的作用,使費米面附近能帶數(shù)增加,更有利于電子傳遞,使電子電導(dǎo)率增加,充放電速率提高;Li-O鍵鍵長明顯變大,有利于Li離子的擴散。雖然摻雜量大,帶隙下降多,但會影響Li離子的擴散,尤其是在Li位摻雜時。綜合考慮摻雜量不需要太大。

    Abstract:

    The electronic structure of LiFePO4, including the energy band, PDOS and popularity analysis was determined by the first-principles based on the density functional theory (DFT), via Nb substituting for Fe or Li with Nb in LiFePO4 supercell. Results show that after Nb doping, the structure is stable and the band gap decreases resulting in the increase of the electronic conductivity and the rate of discharge/recharge, and this can be attributed to the electrons in orbital d, which leads to the increasing of the band near the Fermi level. The bond length of Li-O increases, which benefits the diffusivity of lithium ion. The band gap decreases with more doping amount, and it can influence the diffusivity of lithium ion, especially at Li site. Therefore, it is concluded that the doping content should not be too much.

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張培新,張冬云,黃 磊,惠文彬,魏 群,宋申華. Nb摻雜LiFePO4電子結(jié)構(gòu)的第一性原理研究[J].稀有金屬材料與工程,2013,42(4):718~723.[Zhang Peixin, Zhang Dongyun, Huang Lei, Hui Wenbin, Wei Qun, Song Shenhua. First-Principles Study of Electronic Structure of Nb-Doped LiFePO4[J]. Rare Metal Materials and Engineering,2013,42(4):718~723.]
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  • 收稿日期:2012-04-25
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