scholarly journals Electrorefining of copper and anode passivation

2020 ◽  
Vol 136 (3) ◽  
pp. 14-24
Author(s):  
Hideaki SASAKI ◽  
Yuma NINOMIYA ◽  
Toru H. OKABE
Keyword(s):  
Anode Passivation

Influence of VC and FEC Additives on Interphase Properties of Carbon in Li-Ion Cells Investigated by Combined EIS & EQCM-D

2020 ◽  
Author(s):  
Paul Kitz ◽  
Matthew Lacey ◽  
Petr Novák ◽  
Erik Berg
Keyword(s):  
Electrochemical Impedance ◽  
Solid Electrolyte Interphase ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Gas Analysis ◽  
Side Reactions ◽  
Ion Diffusion ◽  
Battery Cell ◽  
Anode Passivation ◽  
Order Of Magnitude ◽  
Li Ion

<div>The electrolyte additives vinylene carbonate (VC) and fluoroethylene carbonate (FEC) are well known for increasing the lifetime of a Li-ion battery cell by supporting the formation of an effective solid electrolyte interphase (SEI) at the anode. In this study combined simultaneous electrochemical impedance spectroscopy (EIS) and <i>operando</i> electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) are employed together with <i>in situ</i> gas analysis (OEMS) to study the influence of VC and FEC on the passivation process and the interphase properties at carbon-based anodes. In small quantities both additives reduce the initial interphase mass loading by 30 to 50 %, but only VC also effectively prevents continuous side reactions and improves anode passivation significantly. VC and FEC are both reduced at potentials above 1 V vs. Li<sup>+</sup>/Li in the first cycle and change the SEI composition which causes an increase of the SEI shear storage modulus by over one order of magnitude in both cases. As a consequence, the ion diffusion coefficient and conductivity in the interphase is also significantly affected. While small quantities of VC in the initial electrolyte increase the SEI conductivity, FEC decomposition products hinder charge transport through the SEI and thus increase overall anode impedance significantly. </div>

ChemInform Abstract: Effect of Alloying on Anode Passivation in the Ca/SOCl2 Battery.

ChemInform ◽  
2010 ◽  
Vol 24 (3) ◽  
pp. no-no
Author(s):  
S. B. DOWNEY ◽  
O. F. DEVEREUX
Keyword(s):  
Anode Passivation ◽  
Effect Of Alloying

The Effect of Grain Size and Cl-Concentration on the Passive Behavior of Cu in Borate Buffer Solution

2013 ◽  
Vol 785-786 ◽  
pp. 928-932 ◽  
Author(s):  
Qi Jun Zhong ◽  
Li Bin Yu ◽  
Yi Xiao ◽  
Yi Wang ◽  
Qiong Yu Zhou ◽  
...  
Keyword(s):  
Grain Size ◽  
Electrochemical Analysis ◽  
Borate Buffer ◽  
Borate Buffer Solution ◽  
Buffer Solution ◽  
Solution Ph ◽  
Passivation Film ◽  
Passive Behavior ◽  
Anode Passivation ◽  
Passivation Potential

Effect of grain size and Cl-concentration on corrosion behavior of Cu was investigated by using a series of electrochemical analysis in borate buffer solution (pH=8.40).The results indicated that in all cases, the Mott-Schottky plots of the passive films on the surface of Cu were linear with negative slop, and showed behavior of the p-type semiconductor.With the decrease of the grain size and the increase of anode passivation potential, the acceptor density (NA) of the passivation film on the surface of Cu was reducing. As the concentration of Cl-in the medium solution was heightening, the acceptor density (NA) of the passivation film on the surface of Cu was increasing.

Anode Passivation and Electrolyte Solvent Disproportionation: Mechanism of Ester Exchange Reaction in Lithium‐Ion Batteries

1997 ◽  
Vol 144 (6) ◽  
pp. 1944-1948 ◽  
Author(s):  
Esther S. Takeuchi ◽  
Hong Gan ◽  
Marcus Palazzo ◽  
Randolph A. Leising ◽  
Steven M. Davis
Keyword(s):  
Lithium Ion Batteries ◽  
Exchange Reaction ◽  
Lithium Ion ◽  
Ester Exchange ◽  
Anode Passivation ◽  
Ester Exchange Reaction

Influence of VC and FEC Additives on Interphase Properties of Carbon in Li-Ion Cells Investigated by Combined EIS & EQCM-D

2020 ◽  
Author(s):  
Paul Kitz ◽  
Matthew Lacey ◽  
Petr Novák ◽  
Erik Berg
Keyword(s):  
Electrochemical Impedance ◽  
Solid Electrolyte Interphase ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Gas Analysis ◽  
Side Reactions ◽  
Ion Diffusion ◽  
Battery Cell ◽  
Anode Passivation ◽  
Order Of Magnitude ◽  
Li Ion

<div>The electrolyte additives vinylene carbonate (VC) and fluoroethylene carbonate (FEC) are well known for increasing the lifetime of a Li-ion battery cell by supporting the formation of an effective solid electrolyte interphase (SEI) at the anode. In this study combined simultaneous electrochemical impedance spectroscopy (EIS) and <i>operando</i> electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) are employed together with <i>in situ</i> gas analysis (OEMS) to study the influence of VC and FEC on the passivation process and the interphase properties at carbon-based anodes. In small quantities both additives reduce the initial interphase mass loading by 30 to 50 %, but only VC also effectively prevents continuous side reactions and improves anode passivation significantly. VC and FEC are both reduced at potentials above 1 V vs. Li<sup>+</sup>/Li in the first cycle and change the SEI composition which causes an increase of the SEI shear storage modulus by over one order of magnitude in both cases. As a consequence, the ion diffusion coefficient and conductivity in the interphase is also significantly affected. While small quantities of VC in the initial electrolyte increase the SEI conductivity, FEC decomposition products hinder charge transport through the SEI and thus increase overall anode impedance significantly. </div>

Effect of impurities in recycling water on Pb-Ag anode passivation in zinc electrowinning process

2011 ◽  
Vol 21 (7) ◽  
pp. 1665-1672 ◽  
Author(s):  
Hui LIU ◽  
Yun-yan WANG ◽  
Li-yuan CHAI ◽  
Hai-juan XIAO ◽  
Fei PEI ◽  
...  
Keyword(s):  
Zinc Electrowinning ◽  
Anode Passivation ◽  
Effect Of Impurities
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