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首页> 外文期刊>RSC Advances >The controlled synthesis and improved electrochemical cyclability of Mn-doped alpha-Fe2O3 hollow porous quadrangular prisms as lithium-ion battery anodes
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The controlled synthesis and improved electrochemical cyclability of Mn-doped alpha-Fe2O3 hollow porous quadrangular prisms as lithium-ion battery anodes

机译：Mn掺杂α-Fe2O3中空多孔四边形棱镜作为锂离子电池阳极的受控合成及改进的电化学环状性

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摘要

A two-step process of initial oxalate co-precipitation and subsequent thermal decomposition facilitates the formation of hydrated oxalate precursors with hollow quadrangular prism shapes, and then confers a porous nature for the prismatic shells of synthetic hematite (alpha-Fe2O3) and its Mn-doped derivative. When applied as lithium-ion battery anodes, Mn-doped alpha-Fe2O3 exhibits an improved electrochemical performance compared with undoped alpha-Fe2O3. At a current density of 200 mA g(-1), the pure alpha-Fe2O3 electrode gives an initial discharge capacity of similar to 1280 mA h g(-1) with a low retention ratio of 13.9% (i.e., capacity similar to 178 mA h g(-1)) over 80 cycles, while the Mn-doped product, rhombohedral Fe1.7Mn0.3O3, delivers a relatively low initial value of similar to 1190 mA h g(-1) and retains an 80th cycle reversible capacity of similar to 1000 mA h g(-1) (i. e., retention ratio similar to 84.0%). These, together with the better high-rate capability and the lower charge-transfer resistance of the Mn-doped alpha-Fe2O3 anode, simultaneously demonstrate a successful mass production of hollow porous configurations and an effective doping with elemental Mn for potential application.
机译：初始草酸盐共沉淀和随后的热分解的两步过程有助于形成具有中空四边形棱镜形状的水合草酸原体，然后为合成赤铁矿（α-Fe2O3）的棱柱形壳和其Mn-赋予多孔性质。掺杂的衍生物。当施加为锂离子电池阳极时，与未掺杂的α-Fe 2 O 3相比，Mn掺杂的α-Fe2O3表现出改善的电化学性能。在电流密度为200mAg（-1）时，纯α-Fe 2 O 3电极呈初始放电容量与1280 mA Hg（-1）相似，保留比为13.9％（即，与178 mA类似的容量Hg（-1））超过80个循环，而Mn掺杂的产品，rhomboheDral Fe1.7mn0.3O3，相对较低的初始值与1190 mA hg（-1）相似，并保留了类似的80个循环可逆容量1000 mA hg（-1）（即保留比率与84.0％相似）。这些，与Mn掺杂的α-Fe2O3阳极的更好的高速率能力和较低的电荷 - 转移电阻一起，同时证明了中空多孔配置的成功生产和具有元素Mn的有效掺杂，用于潜在应用。

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  • 来源
    《RSC Advances》 |2015年第10期|共7页
  • 作者

    Liu Xinru; Zhao Chenhao; Feng Fan; Yu Faqi; Kang Wenpei; Shen Qiang;

  • 作者单位

    Shandong Univ Sch Chem &

    Chem Engn Key Lab Colloid &

    Interface Chem Educ Minist Jinan 250100 Peoples R China;

    Shandong Univ Sch Chem &

    Chem Engn Key Lab Colloid &

    Interface Chem Educ Minist Jinan 250100 Peoples R China;

    Shandong Univ Sch Chem &

    Chem Engn Key Lab Colloid &

    Interface Chem Educ Minist Jinan 250100 Peoples R China;

    Shandong Univ Sch Chem &

    Chem Engn Key Lab Colloid &

    Interface Chem Educ Minist Jinan 250100 Peoples R China;

    Shandong Univ Sch Chem &

    Chem Engn Key Lab Colloid &

    Interface Chem Educ Minist Jinan 250100 Peoples R China;

    Shandong Univ Sch Chem &

    Chem Engn Key Lab Colloid &

    Interface Chem Educ Minist Jinan 250100 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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