scholarly journals In situ Scanning Electron Microscopy of Silicon Anode Reactions in Lithium-Ion Batteries during Charge/Discharge Processes

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Chih-Yao Chen ◽  
Teruki Sano ◽  
Tetsuya Tsuda ◽  
Koichi Ui ◽  
Yoshifumi Oshima ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Silicon Anode ◽  
Charge Discharge ◽  
Scanning Electron

Coupled Mechanical and Electrochemical Analyses of Three-Dimensional Reconstructed LiFePO4 by Focused Ion Beam/Scanning Electron Microscopy in Lithium-Ion Batteries

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Sangwook Kim ◽  
Hongjiang Chen ◽  
Hsiao-Ying Shadow Huang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Electrochemical Degradation ◽  
Total Polarization ◽  
Scanning Electron

Limited lifetime and performance degradation in lithium ion batteries in electrical vehicles and power tools is still a challenging obstacle which results from various interrelated processes, especially under specific conditions such as higher discharging rates (C-rates) and longer cycles. To elucidate these problems, it is very important to analyze electrochemical degradation from a mechanical stress point of view. Specifically, the goal of this study is to investigate diffusion-induced stresses and electrochemical degradation in three-dimensional (3D) reconstructed LiFePO4. We generate a reconstructed microstructure by using a stack of focused ion beam-scanning electron microscopy (FIB/SEM) images combined with an electrolyte domain. Our previous two-dimensional (2D) finite element model is further improved to a 3D multiphysics one, which incorporates both electrochemical and mechanical analyses. From our electrochemistry model, we observe 95.6% and 88.3% capacity fade at 1.2 C and 2 C, respectively. To investigate this electrochemical degradation, we present concentration distributions and von Mises stress distributions across the cathode with respect to the depth of discharge (DoD). Moreover, electrochemical degradation factors such as total polarization and over-potential are also investigated under different C-rates. Further, higher total polarization is observed at the end of discharging, as well as at the early stage of discharging. It is also confirmed that lithium intercalation at the electrode-electrolyte interface causes higher over-potential at specific DoDs. At the region near the separator, a higher concentration gradient and over-potential are observed. We note that higher over-potential occurs on the surface of electrode, and the resulting concentration gradient and mechanical stresses are observed in the same regions. Furthermore, mechanical stress variations under different C-rates are quantified during the discharging process. With these coupled mechanical and electrochemical analyses, the results of this study may be helpful for detecting particle crack initiation.

scholarly journals Recovery Of Electrodic Powder From Spent Lithium Ion Batteries (LIBs)

2015 ◽  
Vol 60 (2) ◽  
pp. 1145-1149 ◽  
Author(s):  
S.M. Shin ◽  
G.J. Jung ◽  
Woo-Jin Lee ◽  
C.Y. Kang ◽  
J.P. Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Inert Atmosphere ◽  
X Ray Diffraction ◽  
Recycling Process ◽  
X Ray ◽  
New Process ◽  
Scanning Electron

Abstract This study was focused on recycling process newly proposed to recover electrodic powder enriched in cobalt (Co) and lithium (Li) from spent lithium ion battery. In addition, this new process was designed to prevent explosion of batteries during thermal treatment under inert atmosphere. Spent lithium ion batteries (LIBs) were heated over the range of 300°C to 600°C for 2 hours and each component was completely separated inside reactor after experiment. Electrodic powder was successfully recovered from bulk components containing several pieces of metals through sieving operation. The electrodic powder obtained was examined by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and atomic absorption spectroscopy (AA) and furthermore image of the powder was taken by scanning electron microscopy (SEM). It was finally found that cobalt and lithium were mainly recovered to about 49 wt.% and 4 wt.% in electrodic powder, respectively.

Hydrothermal Synthesis and Electrochemical Performance of LiFePO4/Graphene Composites for Lithium-Ion Batteries

2014 ◽  
Vol 900 ◽  
pp. 242-246 ◽  
Author(s):  
Xing Ling Lei ◽  
Hai Yan Zhang ◽  
Yi Ming Chen ◽  
Wen Guang Wang ◽  
Zi Dong Huang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Galvanostatic Charge ◽  
X Ray ◽  
Charge Discharge ◽  
Scanning Electron ◽  
Discharge Test

LiFePO4/graphene composites were prepared via a simple hydrothermal method. The as-prepared LiFePO4/graphene composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests. The lithium-ion batteries using LiFePO4/graphene composites as cathode material exhibited a discharge capacity of 165 mAh/g, which was 97% of the theoretical capacity of 170 mAh/g.

In situ scanning electron microscopy on lithium-ion battery electrodes using an ionic liquid

2011 ◽  
Vol 196 (15) ◽  
pp. 6382-6387 ◽  
Author(s):  
Di Chen ◽  
Sylvio Indris ◽  
Michael Schulz ◽  
Benedikt Gamer ◽  
Reiner Mönig
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ionic Liquid ◽  
Lithium Ion Battery ◽  
Lithium Ion ◽  
Scanning Electron

Synthesis of LiNi0.5Mn1.5O4 by a Microwave Heating Method

2013 ◽  
Vol 566 ◽  
pp. 99-102 ◽  
Author(s):  
Takumi Ose ◽  
Tomonori Kaga ◽  
Masashi Higuchi ◽  
Keiichi Katayama
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Microwave Heating ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Heating Method ◽  
X Ray ◽  
Nickel Manganese ◽  
Scanning Electron

Lithium nickel manganese oxide, LiNi0.5Mn1.5O4, a cathode material for lithium-ion batteries was synthesized by a microwave heating method. Synthesized samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical properties. The results revealed that spinel LiNi0.5Mn1.5O4 powders can be directly synthesized by microwave heating. The precursor prepared using 48 to 64 g of PVA solution would be best to synthesize LiNi0.5Mn1.5O4 successfully by microwave heating.

High-Resolution Resistance Mapping in SEM

2018 ◽  
Author(s):  
Grigore Moldovan ◽  
Wolfgang Joachimi ◽  
Guillaume Boetsch ◽  
Jörg Jatzkowski ◽  
Frank Altman
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Reference Structure ◽  
Total Resistance ◽  
Embedded Electronics ◽  
Improved Performance ◽  
Mapping Techniques ◽  
Scanning Electron

Abstract This work presents advanced resistance mapping techniques based on Scanning Electron Microscopy (SEM) with nanoprobing systems and the related embedded electronics. Focus is placed on recent advances to reduce noise and increase speed, such as integration of dedicated in situ electronics into the nanoprobing platform, as well as an important transition from current-sensitive to voltagesensitive amplification. We show that it is now possible to record resistance maps with a resistance sensitivity in the 10W range, even when the total resistance of the mapped structures is in the range of 100W. A reference structure is used to illustrate the improved performance, and a lowresistance failure case is presented as an example of analysis made possible by these developments.

scholarly journals Design and Characterization of Microscale Auxetic and Anisotropic Structures Fabricated by Multiphoton Lithography

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 446
Author(s):  
Ioannis Spanos ◽  
Zacharias Vangelatos ◽  
Costas Grigoropoulos ◽  
Maria Farsari
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Mechanical Performance ◽  
Element Analysis ◽  
Mechanical Responses ◽  
Multiphoton Lithography ◽  
Anisotropic Structures ◽  
Scanning Electron

The need for control of the elastic properties of architected materials has been accentuated due to the advances in modelling and characterization. Among the plethora of unconventional mechanical responses, controlled anisotropy and auxeticity have been promulgated as a new avenue in bioengineering applications. This paper aims to delineate the mechanical performance of characteristic auxetic and anisotropic designs fabricated by multiphoton lithography. Through finite element analysis the distinct responses of representative topologies are conveyed. In addition, nanoindentation experiments observed in-situ through scanning electron microscopy enable the validation of the modeling and the observation of the anisotropic or auxetic phenomena. Our results herald how these categories of architected materials can be investigated at the microscale.

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