3為氧化劑,對(duì)甲苯磺酸鈉為摻雜劑,通過(guò)吡咯單體在釩酸鋰表面的氧化聚合制備出了釩酸鋰/聚吡咯(LiV3O8/PPy)復(fù)合材料。采用X-射線衍射(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)對(duì)復(fù)合材料的結(jié)構(gòu)與形貌進(jìn)行表征。用恒流充放電測(cè)試、循環(huán)伏安(CV)和交流阻抗(EIS)等研究了聚吡咯包覆量對(duì)材料電化學(xué)性能的影響。結(jié)果表明:在釩酸鋰表面均勻地包覆了一層厚度約10nm的聚吡咯,但并沒(méi)有改變釩酸鋰的晶型結(jié)構(gòu)。當(dāng)聚吡咯包覆量為6% 時(shí),復(fù)合材料的電化學(xué)性能最好,在0.1C充放電倍率下,首次放電比容量為274mAh/g,循環(huán)100次后樣品的放電比容量為239.4mAh/g,容量保持率為87.4%,而未包覆PPy的LiV3O8,其首次放電比容量為227.4mAh/g,循環(huán)100次后樣品的放電比容量為160.1mAh/g,容量保持率僅為70.4%。LiV3O8/PPy復(fù)合正極材料的電化學(xué)性能得到了明顯提高。"/>

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非水體系中釩酸鋰/聚吡咯復(fù)合正極材料的制備及性能研究
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深圳大學(xué)化學(xué)與環(huán)境工程學(xué)院,深圳大學(xué)化學(xué)與環(huán)境工程學(xué)院,深圳大學(xué)化學(xué)與環(huán)境工程學(xué)院,深圳大學(xué)化學(xué)與環(huán)境工程學(xué)院,深圳大學(xué)化學(xué)與環(huán)境工程學(xué)院

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Electrochemical performance of LiV3O8/PPy composite materials synthesized by the non-water system
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College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University

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NSFC; the Natural Science Foundation of Guangdong

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    摘要:

    采用乙醇作為介質(zhì),FeCl3為氧化劑,對(duì)甲苯磺酸鈉為摻雜劑,通過(guò)吡咯單體在釩酸鋰表面的氧化聚合制備出了釩酸鋰/聚吡咯(LiV3O8/PPy)復(fù)合材料。采用X-射線衍射(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)對(duì)復(fù)合材料的結(jié)構(gòu)與形貌進(jìn)行表征。用恒流充放電測(cè)試、循環(huán)伏安(CV)和交流阻抗(EIS)等研究了聚吡咯包覆量對(duì)材料電化學(xué)性能的影響。結(jié)果表明:在釩酸鋰表面均勻地包覆了一層厚度約10nm的聚吡咯,但并沒(méi)有改變釩酸鋰的晶型結(jié)構(gòu)。當(dāng)聚吡咯包覆量為6% 時(shí),復(fù)合材料的電化學(xué)性能最好,在0.1C充放電倍率下,首次放電比容量為274mAh/g,循環(huán)100次后樣品的放電比容量為239.4mAh/g,容量保持率為87.4%,而未包覆PPy的LiV3O8,其首次放電比容量為227.4mAh/g,循環(huán)100次后樣品的放電比容量為160.1mAh/g,容量保持率僅為70.4%。LiV3O8/PPy復(fù)合正極材料的電化學(xué)性能得到了明顯提高。

    Abstract:

    LiV3O8/polypyrrole (PPy) composite materials were prepared by an oxidative polymerization of pyrrole monomer on the surface of LiV3O8 using ethanol as medium, FeCl3 as oxidant, benzene sulfonic acid sodium salt as dopant. The crystal structures and microstructures of LiV3O8/PPy were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The electrochemical properties of the composites were investigated with galvanostatic charge–discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results show that 10nm pyrrole was uniformly polymerized around the LiV3O8, and the PPy-coating did not alter the crystal structure of the LiV3O8. LiV3O8/PPy composite material containing 6% PPy (LVP6) exhibits perfect electrochemical properties, its first discharge capacity reaches a high specific discharge capacity of 274 mAh/g and maintains a stable capacity of 239.4 mAh/g within 100 cycles at the charge–discharge rate of 0.1 C and in the voltage range of 1.8~4.0 V, the capacity retention is 87.4%. But the pure LiV3O8 shows that the first discharge capacity is 227.4 mAh/g and the discharge capacity is 160.1 mAh/g after 100 cycles, the capacity retention is only about 70.4%. LiV3O8/PPy composite materials show better cycling performance than the pure LiV3O8.

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石釧,胡盛名,任祥忠,高原,張培新.非水體系中釩酸鋰/聚吡咯復(fù)合正極材料的制備及性能研究[J].稀有金屬材料與工程,2018,47(S2):277~281.[Chuan Shi, Shengming Hu, Xiangzhong Ren, Yuan Gao, Peixin Zhang. Electrochemical performance of LiV3O8/PPy composite materials synthesized by the non-water system[J]. Rare Metal Materials and Engineering,2018,47(S2):277~281.]
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  • 收稿日期:2017-12-04
  • 最后修改日期:2017-12-04
  • 錄用日期:2018-02-01
  • 在線發(fā)布日期: 2018-11-01
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