Dynamically visualizing battery reactions by operando Kelvin probe force microscopy
Dynamically visualizing battery reactions by operando Kelvin probe force microscopy
复制标题
DOI：
10.1038/s42004-019-0245-x
复制
发表时间：
2019-12-12
影响因子：
5.9
通讯作者：
Ishida, Nobuyuki
中科院分区：
文献类型：
--
作者：
Masuda, Hideki;Matsushita, Kyosuke;Ishida, Nobuyuki
利用电化学反应的储能装置已经成为我们日常生活中不可或缺的一部分，对其性能的进一步提高提出了更高的要求。为此，一项重要的任务是彻底了解支配它们化学的电化学过程。在这里，我们开发了一种基于开尔文探针力显微镜的方法，该方法能够动态显示运行中的电化学设备中内部电位分布的变化，并使用它来表征全固态锂离子电池。在循环伏安操作过程中，对阴极复合区的观察揭示了充放电过程中局部电化学反应行为的差异。基于对结果的仔细检查，我们发现这种差异是由于复合电极中电子传导路径网络状态的变化引起的。我们的方法为了解器件在电化学操作过程中的局部电化学反应提供了新的见解。
Energy storage devices using electrochemical reactions have become an integral part of our daily lives, and further improvement of their performance is highly demanded. An important task for this purpose is to thoroughly understand the electrochemical processes governing their chemistry. Here we develop a method based on Kelvin probe force microscopy that enables dynamic visualization of changes in the internal potential distribution in an operating electrochemical device and use it to characterize an all-solid-state lithium ion battery. Observation of the cathode composite regions during a cyclic voltammetry operation reveals differences between the behavior of local electrochemical reactions in the charge and discharge processes. Based on careful inspection of the results, we show that the difference arises from a change in the state of an electronic conductive path network in the composite electrode. Our method provides new insights into the local electrochemical reactions during electrochemical operation of devices.