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Li1+x(Fey/2Niy/2Mn1-y)1-xO2正極材料的合成及電化學(xué)性能
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國(guó)家“973”重點(diǎn)基礎(chǔ)研究發(fā)展規(guī)劃(2009CB220100)


Synthesis and Electrochemical Performance of Li1+x(Fey/2Niy/2Mn1-y)1-xO2 Cathode Material
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    摘要:

    采用低溫共沉淀-水熱-煅燒法合成了鋰離子電池Fe-Ni-Mn體系正極材料Li1+x(Fey/2Niy/2Mn1-y)1-xO2,并用XRD、SEM、ICP光譜和電化學(xué)性能測(cè)試對(duì)材料進(jìn)行了表征。XRD測(cè)試和ICP分析表明,F(xiàn)e、Ni取代Li2MnO3中的部分Mn,形成很好的固溶結(jié)構(gòu)yLiFe1/2Ni1/2O2-(1-y)Li2MnO3(y=0.1, 0.2, 0.3, 0.4, 0.5)。SEM測(cè)試表明,取代量y不同,材料的表觀形貌有所不同,y=0.4時(shí)材料的顆粒粒徑均勻、較小,呈類球形結(jié)構(gòu)。電化學(xué)性能測(cè)試表明,當(dāng)y=0.4時(shí),循環(huán)穩(wěn)定性最好,充放電50 次后放電比容量仍可維持在195.0 mAh/g,放電中值電壓為3.5 V,y=0.4時(shí)樣品在大倍率放電下的電化學(xué)性能表現(xiàn)良好

    Abstract:

    Li1+x(Fey/2Niy/2Mn1-y)1-xO2 was synthesized by a coprecipitation-hydrothermal-calcinations method. The crystal structure and charge/discharge performance of Li1+x(Fey/2Niy/2Mn1-y)1-xO2 were analyzed by X-ray diffraction (XRD), inductively coupled plasma (ICP) and electrochemical performance measurement. The XRD tests and ICP analyses demonstrate that Fe and Ni substitute a part of Mn of Li2MnO3 to form the good solid solution structure yLiFe1/2Ni1/2O2-(1-y)Li2MnO3 (y= 0.1, 0.2, 0.3, 0.4, 0.5). SEM images show that different y values lead to different apparent morphologies of the materials. When y=0.4, the particles are spherical with uniform and small size. The electrochemical tests indicate that when y=0.4, the cathode material has the best electrochemical performance with the discharge capacity of 195.0 mAh/g after 50 cycles

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王秋艷,徐連義,付 煜,張艷麗,謝 嫚. Li1+x(Fey/2Niy/2Mn1-y)1-xO2正極材料的合成及電化學(xué)性能[J].稀有金屬材料與工程,2013,42(9):1869~1873.[Wang Qiuyan, Xu Lianyi, Fu Yu, Zhang Yanli, Xie Man. Synthesis and Electrochemical Performance of Li1+x(Fey/2Niy/2Mn1-y)1-xO2 Cathode Material[J]. Rare Metal Materials and Engineering,2013,42(9):1869~1873.]
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  • 收稿日期:2012-09-29
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