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首页> 外文期刊>Advanced Functional Materials >A Free-Standing and Ultralong-Life Lithium-Selenium Battery Cathode Enabled by 3D Mesoporous Carbon/Graphene Hierarchical Architecture
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A Free-Standing and Ultralong-Life Lithium-Selenium Battery Cathode Enabled by 3D Mesoporous Carbon/Graphene Hierarchical Architecture

机译：3D介孔碳/石墨烯分层体系结构支持的超长寿命超长寿命锂-硒电池阴极

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摘要

High capacity cathode materials for long-life rechargeable lithium batteries are urgently needed. Selenium cathode has recently attracted great research attention due to its comparable volumetric capacity to but much better electrical conductivity than widely studied sulfur cathode. However, selenium cathode faces similar issues as sulfur (i.e., shuttling of polysele-nides, volumetric expansion) and high performance lithium-selenium batteries (Li-Se) have not yet been demonstrated at selenium loading ＞60% in the electrode. In this work, a 3D mesoporous carbon nanoparticles and graphene hierarchical architecture to storage selenium as binder-free cathode material (Se/MCN-RGO) for high energy and long life Li-Se batteries is presented. Such architecture not only provides the electrode with excellent electrical and ionic conductivity, but also efficiently suppresses polyselenides shuttling and accommodates volume change during charge/discharge. At selenium content of 62% in the entire cathode, the freestanding Se/MCN-RGO exhibits high discharge capacity of 655 mAh g~(-1) at 0.1 C (97% of theoretical capacity) and long cycling stability with a very small capacity decay of 0.008% per cycle over 1300 cycles at 1 C. The present report demonstrates significant progress in the development of high capacity cathode materials for long-life Li batteries and flexible energy storage device.
机译：迫切需要用于长寿命可再充电锂电池的高容量阴极材料。硒阴极由于其相当的体积容量而比近来广泛研究的硫阴极具有更好的导电性，因此最近引起了极大的研究关注。但是，硒阴极面临的问题与硫类似（即，聚硒化物的穿梭，体积膨胀）和高性能锂-硒电池（Li-Se）在硒中硒含量＞ 60％时尚未得到证实。在这项工作中，提出了一种3D介孔碳纳米颗粒和石墨烯分层体系结构，用于存储硒作为无粘合剂的阴极材料（Se / MCN-RGO），用于高能量和长寿命的Li-Se电池。这种结构不仅为电极提供了优异的导电性和离子导电性，而且还有效地抑制了硒化物的穿梭并适应充电/放电过程中的体积变化。硒在整个阴极中的含量为62％时，独立的Se / MCN-RGO在0.1 C（理论容量的97％）下显示出655 mAh g〜（-1）的高放电容量，并且循环寿命长，容量非常小在1 C的1300个循环中，每个循环的衰减为0.008％。本报告表明，用于长寿命锂电池和柔性储能装置的高容量阴极材料的开发取得了重大进展。

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  • 来源
    《Advanced Functional Materials》 |2015年第3期|455-463|共9页
  • 作者

    Kai Han; Zhao Liu; Jingmei Shen; Yuyuan Lin; Fang Dai; Hongqi Ye;

  • 作者单位

    College of Chemistry and Chemical Engineering Central South University Changsha, Hunan 410083, P. R. China;

    Department of Material Science and Engineering Northwestern University Evanston, IL 60208, USA;

    Optimal CAE Inc. Plymouth, MI 48170, USA;

    Department of Material Science and Engineering Northwestern University Evanston, IL 60208, USA;

    Optimal CAE Inc. Plymouth, MI 48170, USA;

    College of Chemistry and Chemical Engineering Central South University Changsha, Hunan 410083, P. R. China;

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