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A High Areal Capacity Flexible Lithium-Ion Battery with a Strain-Compliant Design

机译：符合应变设计的高面容量柔性锂离子电池

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摘要

Early demonstrations of wearable devices have driven interest in flexible lithium-ion batteries. Previous demonstrations of flexible lithium-ion batteries trade off between low areal capacity, poor mechanical flexibility and/or high thickness of inactive components. Here, a reinforced electrode design is used to support the active layers of the battery and a freestanding carbon nanotube (CNT) layer is used as the current collector. The supported architecture helps to increase the areal capacity (mAh cm-2) of the battery and improve the tensile strength and mechanical flexibility of the electrodes. Batteries based on lithium cobalt oxide and lithium titanate oxide shows excellent electrochemical and mechanical performance. The battery has an areal capacity of ≈1 mAh cm-2 and a capacity retention of around 94% after cycling the battery for 450 cycles at a C/2 rate. The reinforced electrode has a tensile strength of ≈5.5–7.0 MPa and shows excellent capacity retention after repeatedly flexing to a bending radius ranging from 45 to 10 mm. The relationships between mechanical flexing, electrochemical performance, and mechanical integrity of the battery are studied using electrochemical cycling, electron microscopy, and electrochemical impedance spectroscopy (EIS).
机译：可穿戴设备的早期演示引起了人们对柔性锂离子电池的兴趣。以前的柔性锂离子电池演示在低面积容量，较差的机械柔韧性和/或较高厚度的非活性组件之间进行了权衡。此处，增强电极设计用于支撑电池的活性层，而独立式碳纳米管（CNT）层用作集电器。受支持的体系结构有助于增加电池的面积容量（mAh cm-2），并改善电极的拉伸强度和机械柔韧性。基于钴酸锂和钛酸锂的电池具有出色的电化学和机械性能。在以C / 2速率将电池循环450次后，电池的容量约为≈1 mAh cm-2，容量保持率约为94％。增强电极的抗拉强度约为5.5-7.0 MPa，在反复弯曲至45至10 mm的弯曲半径后，表现出出色的容量保持能力。使用电化学循环，电子显微镜和电化学阻抗谱（EIS）研究了电池的机械挠曲，电化学性能和机械完整性之间的关系。

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  • 来源
    《Advanced energy materials》 |2015年第3期|1-11|共11页
  • 作者

    Abhinav M. Gaikwad; Brian V. Khau; Greg Davies; Benjamin Hertzberg; Daniel A. Steingart; Ana Claudia Arias;

  • 作者单位

    Electrical Engineering and Computer Sciences Department University of California Berkeley Berkeley CA USA;

    Electrical Engineering and Computer Sciences Department University of California Berkeley Berkeley CA USA;

    Department of Mechanical and Aerospace Engineering and the Andlinger Center for Energy and The Environment Princeton University Princeton NJ USA;

    Department of Mechanical and Aerospace Engineering and the Andlinger Center for Energy and The Environment Princeton University Princeton NJ USA;

    Department of Mechanical and Aerospace Engineering and the Andlinger Center for Energy and The Environment Princeton University Princeton NJ USA;

    Electrical Engineering and Computer Sciences Department University of California Berkeley Berkeley CA USA;

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  • 正文语种 eng
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  • 关键词

    flexible batteries; flexible electronics; lithium-ion batteries; reinforced electrodes;

    机译：柔性电池;柔性电子产品;锂离子电池;增强电极;

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