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Understanding of the Ultrastable K-lon Storage of Carbonaceous Anode

机译：对碳质阳极超稳定钾离子存储的理解

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摘要

Carbon-based materials are considered to be one of the most promising materials for negative electrodes of the future, because of their good chemical stability, high electrical conductivity, and environmental benignity. However, to date, the underlying principles of K-ion storage in carbonaceous anodes remain elusive, which greatly hinders the development of such a category of anodes. Herein, the ultrastable K-ion storage of carbonaceous anode through systematic analyses, including comprehensive electrochemical characterizations, kinetics calculations, and structural/compositional evolution mechanism studies, is theoretically elucidated and experimentally verified. Specifically, it is found that the uniquely envelope-like nitrogen-doped carbon nanosheets with high pseudocapacitive could bring ultrastable storage of potassium ions, delivering a high initial reversible capacity of 367 mAh g(-1) at a current density of 50 mA g(-1) and retain 70.5 and 75.6% at current densities of 500 and 1000 mA g(-1) after 1000th cycle, respectively. This study could enlighten researchers on further progress in the field of carbonaceous K-ion battery negative electrode with a long cycle life.
机译：碳基材料由于其良好的化学稳定性，高电导率和环境友好性，被认为是未来负极最有前途的材料之一。但是，迄今为止，在碳质阳极中储存K离子的基本原理仍然难以捉摸，这极大地阻碍了这类阳极的发展。在本文中，通过系统的分析，包括全面的电化学表征，动力学计算以及结构/组成演化机理研究，对碳质阳极的超稳定K离子存储进行了理论阐明和实验验证。具体而言，发现具有高假电容的独特包膜状氮掺杂碳纳米片可以带来钾离子的超稳定存储，在50 mA g（的电流密度）下提供367 mAh g（-1）的高初始可逆容量。 -1）并在第1000个循环后分别以500和1000 mA g（-1）的电流密度保留70.5和75.6％。这项研究可以启发研究人员在碳寿命较长的碳质K离子电池负极领域中的进一步发展。

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  • 来源
    《Advanced Functional Materials》 |2018年第29期|1801989.1-1801989.9|共9页
  • 作者

    Liu Lei; Chen Yu; Xie Yihao; Tao Peng; Li Qinyi; Yan Chenglin;

  • 作者单位

    Soochow Univ, Soochow Inst Energy & Mat Innovat, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

    Soochow Univ, Soochow Inst Energy & Mat Innovat, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

    Soochow Univ, Soochow Inst Energy & Mat Innovat, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

    Soochow Univ, Soochow Inst Energy & Mat Innovat, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

    Soochow Univ, Soochow Inst Energy & Mat Innovat, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

    Soochow Univ, Soochow Inst Energy & Mat Innovat, Coll Phys Optoelect & Energy, Suzhou 215006, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    potassium-ion batteries; pseudocapacitive; storage mechanisms; ultrastable; wrinkled envelope-like nanosheets;

    机译：钾离子电池;假电容;存储机制;可超声处理;皱纹的信封状纳米片;

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