...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of power sources >Size-dependent physicochemical and mechanical interactions in battery paste anodes of Si-microwires revealed by Fast-Fourier-Transform Impedance Spectroscopy
【24h】

Size-dependent physicochemical and mechanical interactions in battery paste anodes of Si-microwires revealed by Fast-Fourier-Transform Impedance Spectroscopy

机译：快速傅里叶变换阻抗谱揭示了硅微丝电池浆料阳极中与尺寸有关的物理化学和机械相互作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Perfectly aligned silicon microwire arrays show exceptionally high cycling stability with record setting (high) areal capacities of 4.25 mAh cm(-2). Those wires have a special, modified length and thickness in order to perform this good. Geometry and sizes are the most important parameters of an anode to obtain batteries with high cycling stability without irreversible losses. The wires are prepared with a unique etching fabrication method, which allows to fabricate wires of very precise sizes. In order to investigate how good randomly oriented silicon wires perform in contrast to the perfect order of the array, the wires are embedded in a paste. This study reveals the fundamental correlation between geometry, mechanics and charge transfer kinetics of silicon electrodes. Using a suitable RC equivalent circuit allows to evaluate data from cyclic voltammetry and simultaneous FFT-Impedance Spectroscopy (FFT-IS), yielding in time resolved resistances, time constants, and their direct correlation to the phase transformations. The change of the resistances during lithiation and delithiation correlates to kinetics and charge transfer mechanisms. This study demonstrates how the mechanical and physiochemical interactions at the silicon/paste interface inside the paste electrodes lead to void formation around silicon and with it to material loss and capacity fading.(C) 2017 Elsevier B.V. All rights reserved.
机译：完美对准的硅微线阵列显示出极高的循环稳定性，记录容量高达4.25 mAh cm（-2）（创纪录）。这些电线具有特殊的，经过修改的长度和厚度，以实现良好的效果。几何形状和尺寸是获得具有高循环稳定性且无不可逆损耗的电池的阳极最重要的参数。用独特的蚀刻制造方法来制备导线，这允许制造非常精确尺寸的导线。为了研究与阵列的完美顺序相反的随机取向的硅线的性能如何，将线嵌入到糊剂中。这项研究揭示了硅电极的几何形状，力学和电荷转移动力学之间的基本关系。使用合适的RC等效电路可以评估来自循环伏安法和同时FFT阻抗谱（FFT-IS）的数据，及时产生时间分辨电阻，时间常数及其与相变的直接相关性。锂化和脱锂过程中电阻的变化与动力学和电荷转移机制相关。这项研究证明了糊状电极内部硅/糊状界面处的机械和物理化学相互作用如何导致硅周围形成空隙，并导致材料损失和容量衰减。（C）2017 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号