In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2020-02, No. 2 ( 2020-11-23), p. 184-184
Abstract:
Li-ion batteries use the “composite electrode” which includes active materials, conductive agents, binder, and current collector. In general, the electrode characteristics is affected by not only the active materials property but also the state of “composite”. The state of “composite” has many parameters, for examples, mixing ratio, tap density, thickness, and so on. In order to understand the electrochemical characteristics of an active material, the microelectrode technique is very important. Under microscope observation, the microelectrode is contacted to one active material particle by using micromanipulator. Then, we can evaluate the electrochemical characteristics of one particle. In this presentation, we will introduce the results of “single particle measurement” for Si, LiCoO 2 , LiNi 0.5 Mn 1.5 O 4 , and so on. In addition, microelectrode technique is also useful for the study of Li metal electrode. Li metal electrode is suffered from dendrite growth during charging, and dead lithium formation during discharging. These phenomenon are mainly induced non-uniformity of the current distribution. In addition to that, SEI (solid electrolyte interphase) should play an important role for the morphological variation of the electrodeposited Li metal. Many researches were conducted based on the surface chemistry in order to reveal the relationship between the nature of SEI layer and the morphology of electrodeposited Li metal. However, the localization of the electrodeposition sites is an obstacle for the quantitative analysis in order to discuss the dendrite initiation and growth. In our study, microelectrode was utilized to observe the morphological variation of the electrodeposited Li metal. Constant current electrodeposition was conducted to observe the electrodeposited Li metal. After the electrodeposition, the microelectrode was transferred to FE-SEM or TEM with transfer vessel without air exposure. Ex-situ SEM and TEM observation was done to discuss the electrolyte effects to the morphology of electrodeposited Li metal. We also would like to introduce the typical results of the morphological variation and SEI nature of the electrodeposited Li metal. Figure 1
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2020-022184mtgabs
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2020
detail.hit.zdb_id:
2438749-6
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