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摻雜Pr3+的尖晶石LiPrxMn2-xO4的合成及電化學(xué)性能
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國(guó)家自然科學(xué)基金（50574006）項(xiàng)目資助


Synthesis and Electrochemical Properties of Pr3+-doped LiPrxMn2-xO4 Spinel
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    摘要:

    采用溶膠凝膠法合成摻雜稀土鐠離子的鋰錳尖晶石LiPrxMn2-xO4，并對(duì)其結(jié)構(gòu)和電化學(xué)性能進(jìn)行初步研究。結(jié)果表明，當(dāng)摻入的Pr3+含量較低（x≤0.02）時(shí)，得到的產(chǎn)物能保持完整的尖晶石結(jié)構(gòu)，并表現(xiàn)出極佳的電化學(xué)性能。Pr3+的摻入使材料的循環(huán)穩(wěn)定性能大幅度提高，而這種提高是源于Pr3+對(duì)尖晶石結(jié)構(gòu)的穩(wěn)定作用。電極材料LiPr0.02Mn1.98O4顯示了最優(yōu)的電化學(xué)性能，在0.2 C放電速率下，其初始放電容量為118 mAh·g-1，100次循環(huán)后仍能保持初始容量的98%。

    Abstract:

    Praseodymium doped spinel LiPrxMn2-xO4 with single phase was synthesized by Sol-gel route. Its structure and electrochemical properties were studied by XRD, XPS and electrochemical measurements. The results show that when the doped Pr content is low (x≤0.02), the obtained product can maintain the whole spinel structure and exhibit excellent electrochemical properties. Pr3+ doping increases the cycle stability of the material greatly, which results from its stabilization for the spinel structure. The electrode of LiPr0.02Mn1.98O4 shows optimal electrochemical properties with a first discharge capacity of 118 mAh·g-1 and 98% of the initial capacity after 100 cycles at the current rate of 0.2 C. As cathode material of lithium-ion battery, this praseodymium doped spinel material is one of the most promising substitutes for LiCoO2.

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杜榮斌,劉 濤,姜效軍.摻雜Pr3+的尖晶石LiPrxMn2-xO4的合成及電化學(xué)性能[J].稀有金屬材料與工程,2010,39(5):932~935.[Du Rongbin, Liu Tao, Jiang Xiaojun. Synthesis and Electrochemical Properties of Pr3+-doped LiPrxMn2-xO4 Spinel[J]. Rare Metal Materials and Engineering,2010,39(5):932~935.]
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  • 收稿日期:2009-05-15
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