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首页> 外文期刊>Advanced energy materials >A Robust Route to Co_2(OH)_2CO_3 Ultrathin Nanosheets with Superior Lithium Storage Capability Templated by Aspartic Acid-Functionalized Graphene Oxide
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A Robust Route to Co_2(OH)_2CO_3 Ultrathin Nanosheets with Superior Lithium Storage Capability Templated by Aspartic Acid-Functionalized Graphene Oxide

机译：以天冬氨酸官能化氧化石墨烯为模板的具有优异锂存储能力的Co_2（OH）_2CO_3超薄纳米片的稳健路线

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摘要

Two-dimensional (2D) nanomaterials are widely recognized as an important class of functional materials possessing superior electrochemical reaction kinetics. Herein, an L-aspartic acid (AA)-modified graphene oxide (GO) templating strategy is developed to in situ yield ultrathin (i.e., approximate to 5 nm) cobalt carbonate hydroxide (Co-2(OH)(2)CO3) nanosheets as advanced anode materials of lithium ion batteries. Notably, the covalent tethering of AA on the GO surface renders a high density of carboxyl groups that impart effective loading of Co-containing precursors and subsequent growth into Co-2(OH)(2)CO3 nanosheets bridging adjacent GO layers. The lasagna-like Co-2(OH)(2)CO3-GO nanocomposites exhibit an ultrahigh lithium storage capacity of 1770 mAh g(-1) after 500 cycles at 100 mA g(-1). It is noteworthy that the cycled Co-2(OH)(2)CO3 phase separates into homogeneously dispersed Co(OH)(2) and CoCO3 phases with two different charge plateaus at approximate to 1.2 and 2.0 V, respectively, which effectively inhibit large-scale homophase coarsening of Co, Li2CO3, and LiOH. The much shortened Li+/e(-) transfer distance enabled by individual ultrathin Co-2(OH)(2)CO3 nanosheet together with robust layer-by-layer assembled nanostructure of Co-2(OH)(2)CO3-GO confers the superior electrochemical reactivity and mechanical stability. As such, the amino acid-modified GO templating strategy may represent a simple yet robust means of crafting a variety of 2D nanostructured composites of interest for energy storage applications.
机译：二维（2D）纳米材料被广泛认为是一类重要的功能材料，具有出色的电化学反应动力学。本文中，开发了一种L-天冬氨酸（AA）改性的氧化石墨烯（GO）模板策略，以原位产生超薄（即约5 nm）的碳酸钴氢氧化物（Co-2（OH）（2）CO3）纳米片。作为锂离子电池的高级负极材料。值得注意的是，GO表面上AA的共价束缚使羧基具有高密度，从而赋予了含钴前体有效的负载，并随后生长为桥接相邻GO层的Co-2（OH）（2）CO3纳米片。千层面状的Co-2（OH）（2）CO3-GO纳米复合材料在100 mA g（-1）下经过500次循环后显示出1770 mAh g（-1）的超高锂存储容量。值得注意的是，循环的Co-2（OH）（2）CO3相分离成均匀分散的Co（OH）（2）和CoCO3相，分别在大约1.2 V和2.0 V时具有两个不同的电荷平稳段，有效抑制了Co，Li2CO3和LiOH的大规模均相粗化。单独的超薄Co-2（OH）（2）CO3纳米片和坚固的Co-2（OH）（2）CO3-GO逐层组装的纳米结构共同实现了大大缩短的Li + / e（-）转移距离优异的电化学反应性和机械稳定性。因此，氨基酸修饰的GO模板化策略可以代表一种简单而健壮的方法，可为能量存储应用制作各种感兴趣的2D纳米结构复合材料。

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  • 来源
    《Advanced energy materials》 |2019年第26期|1901093.1-1901093.11|共11页
  • 作者

    Zhao Shiqiang; Wang Zewei; He Yanjie; Jiang Hongrui; Harn Yeu Wei; Liu Xueqin; Su Chenliang; Jin Huile; Li Ying; Wang Shun; Shen Qiang; Lin Zhiqun;

  • 作者单位

    Shenzhen Univ, Coll Optoelect Engn, Minist Educ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Shenzhen 518060, Peoples R China|Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

    Shandong Univ, Sch Chem & Chem Engn, Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Shandong, Peoples R China;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

    China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, Wuhan 430074, Hubei, Peoples R China;

    Shenzhen Univ, Coll Optoelect Engn, Minist Educ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Shenzhen 518060, Peoples R China;

    Wenzhou Univ, Coll Chem & Mat Engn, Wenzhou 325035, Peoples R China;

    Shenzhen Univ, Coll Optoelect Engn, Minist Educ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Shenzhen 518060, Peoples R China;

    Wenzhou Univ, Coll Chem & Mat Engn, Wenzhou 325035, Peoples R China;

    Shandong Univ, Sch Chem & Chem Engn, Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Shandong, Peoples R China;

    Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;

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  • 正文语种 eng
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  • 关键词

    amino acid-modified graphene oxide; cobalt carbonate hydroxide (Co-2(OH)(2)CO3); lithium ion batteries; templated growth; ultrathin nanosheet;

    机译：氨基酸改性的石墨烯氧化物;碳酸钴氢氧化物（CO-2（OH）（2）CO3）;锂离子电池;模板增长;超薄纳米;

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