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首页> 外文期刊>Journal of power sources >Dense CoO/graphene stacks via self-assembly for improved reversibility as high performance anode in lithium ion batteries
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Dense CoO/graphene stacks via self-assembly for improved reversibility as high performance anode in lithium ion batteries

机译：通过自组装形成致密的CoO /石墨烯叠层，以改善可逆性，作为锂离子电池中的高性能阳极

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摘要

Here, we propose a novel strategy to prepare dense stacks composed of alternating CoO and graphene layers for an anode in lithium ion batteries (LIBs), which contributes to enhanced stability and relatively large reversible capacity. This is accomplished by spontaneously pre-aligning negatively charged CoO-anchored graphene oxide (CG) and positively charged amine-functionalized graphene (GN) in an acidic medium, followed by thermal reduction. The performance of this product is contrasted with that of CG prepared under the identical conditions without the addition of GN, in which CoO nanoparticles are sandwiched between relatively loose and randomly oriented graphene stacks. For example, the composite delivers a capacity greater than 800 mAh g~(-1) with a fading rate of 0.04 mAh g~(-1) cycle~(-1) during 1000 charge/discharge (C/D) cycles at 1.0 A g~(-1) in contrast to ca. 400 mAh g~(-1) and 0.24 mAh g~(-1) cycle~(-1) for thermally reduced CG without the addition of GN. The origin of the superior electrochemical performance in the dense stacks is ascribed to the enhanced reversibility of a conversion reaction, which in turn contributes to a persistent formation/dissolution of gel-like polymer films (i.e., stable pseudo-capacitance). Experimental evidences that substantiate the aforementioned behaviors (improved reversibility for both processes) are presented.
机译：在这里，我们提出了一种新颖的策略，以制备由交替的CoO和石墨烯层组成的致密堆栈，用于锂离子电池（LIB）中的阳极，这有助于提高稳定性和相对较大的可逆容量。这是通过在酸性介质中自发预对准带负电的CoO固定的氧化石墨烯（CG）和带正电的胺官能化的石墨烯（GN），然后进行热还原来实现的。该产品的性能与在不添加GN的相同条件下制备的CG的性能形成对比，在相同的条件下，CoO纳米颗粒夹在相对疏松且随机取向的石墨烯堆栈之间。例如，复合材料在1000次充/放电（C / D）周期为1.0时，提供的容量大于800 mAh g〜（-1），衰减率为0.04 mAh g〜（-1）cycle〜（-1）。与ca相比，g〜（-1）。 400 mAh g〜（-1）和0.24 mAh g〜（-1）循环〜（-1）用于热还原CG，而无需添加GN。致密叠层中优异的电化学性能的起因归因于转化反应的可逆性的增强，这反过来又有助于凝胶状聚合物膜的持久形成/溶解（即稳定的假电容）。实验证据证实了上述行为（两个过程的可逆性均得到改善）。

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  • 来源
    《Journal of power sources》 |2014年第25期|1037-1045|共9页
  • 作者

    S.J. Richard Prabakar; R. Suresh Babu; Minhak Oh; Myoung Soo Lah; Su Cheol Han; Jaehyang Jeong; Myoungho Pyo;

  • 作者单位

    Department of Printed Electronics Engineering, Sunchon National University, Sunchon, Chonnam 540-742, Republic of Korea;

    Department of Printed Electronics Engineering, Sunchon National University, Sunchon, Chonnam 540-742, Republic of Korea;

    Department of Chemistry, Ulsan National Institute of Science & Technology, Ulju-gun, Ulsan 689-798, Republic of Korea;

    Department of Chemistry, Ulsan National Institute of Science & Technology, Ulju-gun, Ulsan 689-798, Republic of Korea;

    Department of Printed Electronics Engineering, Sunchon National University, Sunchon, Chonnam 540-742, Republic of Korea;

    Department of Printed Electronics Engineering, Sunchon National University, Sunchon, Chonnam 540-742, Republic of Korea;

    Department of Printed Electronics Engineering, Sunchon National University, Sunchon, Chonnam 540-742, Republic of Korea;

  • 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

    Graphene; Cobalt oxide; Self-assembly; Anode; Lithium ion batteries;

    机译：石墨烯氧化钴自组装;阳极;锂离子电池;

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