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首页> 外文期刊>Journal of materials science >Porous hierarchical spinel Mn-doped NiCo_2O_4 nanosheet architectures as high-performance anodes for lithium-ion batteries and electrochemical reaction mechanism
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Porous hierarchical spinel Mn-doped NiCo_2O_4 nanosheet architectures as high-performance anodes for lithium-ion batteries and electrochemical reaction mechanism

机译：多孔层状尖晶石Mn掺杂的NiCo_2O_4纳米片结构作为锂离子电池的高性能阳极和电化学反应机理

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摘要

We report an efficient co-precitation and subsequent annealing chemical route to synthesize porous hierarchical Mn-doped NiCo2O4 nanosheet architectures. The as-synthesized products exhibit unique porous hierarchical structures. When tested as anode materials for lithium-ion batteries, the Mn-doped NiCo2O4 architectures show excellent performances of Li+ storage. Under a current density of 0.5 A g(-1), 5% Mn-NiCo2O4 electrode is capable of retaining a specific capacity of 1428mA h g(-1) over 80 cycles. Even at 2 and 5 A g(-1), comparable capacities of 1220 and 987mA h g(-1) could still be achieved, indicating a superior rate capability. Ex-situ XRD, HRTEM measurements reveal the electrochemical mechanism of NiCo2O4 architecture anode. On basis of above analyses, the excellent electrochemical performances of porous hierarchical Mn-doped NiCo2O4 nanosheet architectures should be ascribed to the following aspects. (1) The self-adsorbed 2D nanosheet hierarchical multilayer architectures are favorable to the infiltration of electrolyte and beneficial to the available space for lithium ion diffusion. (2) Mn doping and multiple nanosheets may synergistically enhance the electrical/ionic conductivity, reversible capacity, and mechanical stability of electrodes. (3) Porous continuous network structure can enlarge the contact area of Li2O and Ni, Co, CoO nanoparticles, thus improves the Li+ storage and rate performance of NiCo2O4 -based electrode.
机译：我们报告了有效的共沉淀和随后的退火化学路线，以合成多孔分层锰掺杂的NiCo2O4纳米片结构。合成后的产品表现出独特的多孔层次结构。当作为锂离子电池的负极材料进行测试时，Mn掺杂的NiCo2O4结构显示出Li +储存的出色性能。在0.5 A g（-1）的电流密度下，5％Mn-NiCo2O4电极能够在80个循环中保持1428mA h g（-1）的比容量。即使在2和5 A g（-1）的情况下，仍可达到1220和987mA h g（-1）的可比容量，这表明它具有出色的倍率能力。 XRD，HRTEM的异位测量揭示了NiCo2O4结构阳极的电化学机理。基于以上分析，应当将多孔多层Mn掺杂的NiCo 2 O 4纳米片结构的优异电化学性能归因于以下方面。 （1）自吸附式2D纳米片分层多层结构有利于电解质的渗透，有利于锂离子扩散的可用空间。 （2）Mn掺杂和多个纳米片可以协同增强电极的电/离子导电性，可逆容量和机械稳定性。 （3）多孔连续网络结构可以扩大Li2O与Ni，Co，CoO纳米颗粒的接触面积，从而提高NiCo2O4基电极的Li +储量和倍率性能。

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  • 来源
    《Journal of materials science》 |2019年第9期|8555-8567|共13页
  • 作者

    Ma Jingyun; Guo Enyan; Yin Longwei;

  • 作者单位

    Qilu Univ Technol, Shandong Acad Sci, Key Lab Proc & Testing Technol Glass & Funct Cera, Sch Mat Sci & Engn, Jinan 250353, Shandong, Peoples R China;

    Qilu Univ Technol, Shandong Acad Sci, Key Lab Proc & Testing Technol Glass & Funct Cera, Sch Mat Sci & Engn, Jinan 250353, Shandong, Peoples R China;

    Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Sch Mat Sci & Engn, Jinan 250061, Shandong, 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);
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