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Structural Feature and Electrochemical Performance of h-LiMnBO3 and Its Carbon Coated Material Prepared by Microwave Synthesis
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Structural Feature and Electrochemical Performance of h-LiMnBO3 and Its Carbon Coated Material Prepared by Microwave Synthesis
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National Natural Science Foundation of China (21104063, 21061015)

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    摘要:

    采用微波合成法制備了LiMnBO3及其碳包覆材料LiMnBO3/C?？疾炝藷Y(jié)溫度和配料比對(duì)LiMnBO3結(jié)構(gòu)的影響。利用XRD、SEM、HR-TEM對(duì)材料的結(jié)構(gòu)和形貌進(jìn)行了表征。通過(guò)恒電流充/放電性能及交流阻抗測(cè)試研究了材料的電化學(xué)性能。結(jié)果表明，實(shí)驗(yàn)所得LiMnBO3具有六方晶體結(jié)構(gòu)（即制得h-LiMnBO3）。750 ℃燒結(jié)溫度下，反應(yīng)25 min，且nLi:nB:nMn=1:1:1時(shí)，材料結(jié)晶較為完善、晶粒細(xì)小、形貌規(guī)整。碳包覆后材料充/放電性能及電導(dǎo)率均有提高。LiMnBO3/C的初次放電比容量達(dá)到50.3 mAh/g

    Abstract:

    LiMnBO3 and its carbon coated material LiMnBO3/C were synthesized by a microwave method. The influences of sintering temperature and feed composition on the structure and the morphology of materials were investigated. XRD, SEM and HR-TEM were used to characterize the structure and the morphology of the materials. The electrochemical properties of materials were tested by constant charge-discharge and electrochemical impedance spectroscopy. The results show that LiMnBO3 has a hexagonal crystal structure (h-LiMnBO3). The good crystalline structure with small grain size can be obtained under the reaction conditions of 750 oC, 25 min and nLi:nB:nMn=1:1:1(molar ratio). The charge-discharge capacity and the conductivity of the carbon coated material are enhanced after carbon coating. The initial discharge capacity of LiMnBO3/C is 50.3 mAh/g

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阿孜古麗·木爾賽力木,馬 婷,粟 智,尼加提·依里. Structural Feature and Electrochemical Performance of h-LiMnBO3 and Its Carbon Coated Material Prepared by Microwave Synthesis[J].稀有金屬材料與工程,2014,43(9):2095~2099.[Arzugul Muslim, Ma Ting, Su Zhi, Nijat Ili. Structural Feature and Electrochemical Performance of h-LiMnBO3 and Its Carbon Coated Material Prepared by Microwave Synthesis[J]. Rare Metal Materials and Engineering,2014,43(9):2095~2099.]
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  • 收稿日期:2013-11-11
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  • 在線發(fā)布日期: 2015-02-25
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