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首页> 外文期刊>Journal of Applied Physics >In-situ nanoscale mapping of surface potential in all-solid-state thin film Li-ion battery using Kelvin probe force microscopy
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In-situ nanoscale mapping of surface potential in all-solid-state thin film Li-ion battery using Kelvin probe force microscopy

机译：使用开尔文探针力显微镜对全固态薄膜锂离子电池中的表面电势进行原位纳米级标测

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摘要

This paper presents an in-situ study by combining contact dc-writing in biased scanning probe microscopy and non-contact Kelvin probe force microscopy to characterize the effect of bias-induced Li+ insertion/extraction on the changes of surface potential of TiO2 anode in an all-solid-state thin film Li-ion battery at nanoscale. With single layer TiO2 film as the reference, the factors affecting the changes of the surface potential, including the Fermi energy level shift and charge screening related to TiO2 semiconductor behavior, and bias-induced Li+ intercalation/ de-intercalation related to battery behavior are investigated. Surface potential hysteresis loop can be formed for TiO2 anode film, in which the potential value increases under the positive polarization and decreases under the negative polarization. In addition, TiO2 anode film after Li+ insertion/extraction cycles has a lower surface potential, indicating the decrease of charge sustaining capacity and the surface electrical degradation. In addition, surface potential barriers (pits) after the positive (negative) polarization have been also observed, which is mainly attributed to the different electrical properties and charge accumulation at grain boundaries.
机译：本文通过结合偏置扫描探针显微镜中的接触式直流写入和非接触式Kelvin探针力显微镜来进行原位研究，以表征偏压诱导的Li +插入/萃取对TiO2阳极表面电势变化的影响。纳米级全固态薄膜锂离子电池。以单层TiO2薄膜为参考，研究了影响表面电势变化的因素，包括与TiO2半导体行为有关的费米能级移动和电荷筛选，以及与电池行为有关的偏压诱导的Li +嵌入/脱嵌。可以为TiO2阳极膜形成表面电势磁滞回线，其中电势值在正极性下增加，在负极性下减少。此外，Li +插入/萃取循环后的TiO2阳极膜具有较低的表面电势，表明电荷维持能力下降和表面电降解。此外，还观察到正（负）极化后的表面势垒（凹坑），这主要归因于不同的电性能和晶界处的电荷积累。

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  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.1-7|共7页
  • 作者

    Zhu Jing; Zeng Kaiyang; Lu Li;

  • 作者单位

    Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576;

  • 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
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