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首页> 外文期刊>Journal of power sources >Nano-MnO_2@TiO_2 microspheres: A novel structure and excellent performance as anode of lithium-ion batteries
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Nano-MnO_2@TiO_2 microspheres: A novel structure and excellent performance as anode of lithium-ion batteries

机译：纳米MnO_2 @ TiO_2微球：新型结构和出色的锂离子电池负极性能

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摘要

A structurally hierarchical MnO2/TiO2 composite (Nano-MnO2@TiO2) is fabricated by calcining MnCO3 microspheres and coating a thin layer of TiO2 through the heat decomposition of tetrabutyl titanate, and evaluated as anode of gravimetrically and volumetrically high energy density lithium ion battery. The characterizations from FESEM, TEM, HRTEM and XRD, indicate that the resulting Nano-MnO2@TiO2 takes a spherical morphology with a core of about 2 gm in diameter, consisting of compact MnO2 nanoparticles, and a shell of 60 nm thick, consisting of smaller TiO2 nanoparticles. The charge/discharge tests demonstrate that Nano-MnO2@TiO2 exhibits excellent performance as anode of lithium ion battery, delivering a capacity of 938 mAh g(-1) at 300 mA g(-1) after 200 cycles, compared to the 103 mAh g(-1) of the uncoated sample. The microsphere consisting of compact nanoparticles provides Nano-MnO2@TiO2 with high specific gravity. The dimensionally and structurally stable TiO2 maintains the integrity of MnO2 microspheres and facilitates lithium insertion/extraction. This unique structure yields the excellent cyclic stability and rate capability of Nano-MnO2@TiO2.
机译：通过煅烧MnCO3微球并通过钛酸四丁酯的热分解涂覆TiO2薄层来制造结构分层的MnO2 / TiO2复合材料（Nano-MnO2 @ TiO2），并作为重量和体积高能量密度锂离子电池的阳极进行评估。 FESEM，TEM，HRTEM和XRD的表征表明，所得的纳米MnO2 @ TiO2呈球形，直径约2 gm，由紧密的MnO2纳米颗粒组成，壳厚60 nm，由较小的TiO2纳米颗粒。充电/放电测试表明，纳米MnO2 @ TiO2作为锂离子电池的阳极具有出色的性能，在200个循环后，在300 mA g（-1）下的容量为938 mAh g（-1），相比之下，其容量为103 mAh g（-1）的未涂层样品。由致密纳米粒子组成的微球为纳米MnO2 @ TiO2提供了高比重。尺寸和结构稳定的TiO2保持MnO2微球的完整性，并有助于锂的插入/提取。这种独特的结构产生了出色的循环稳定性和纳米MnO2 @ TiO2的倍率性能。

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  • 来源
    《Journal of power sources》 |2018年第1期|174-181|共8页
  • 作者

    Cao Zhiguang; Chen Xiaoqiao; Xing Lidang; Liao Youhao; Xu Mengqing; Li Xiaoping; Liu Xiang; Li Weishan;

  • 作者单位

    South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China;

    South China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Manganese dioxide microsphere; Titanium oxide coating; Gravimetrical and volumetric energy density; Cyclic stability; Li ion batteries;

    机译：二氧化锰微球;钛氧化物涂层;重量和体积能密度;循环稳定性;锂离子电池;

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