Interfacial charge-transfer resistance at ionizable thiol monolayer-modified gold electrodes as studied by impedance spectroscopy

2004 ◽  
Vol 49 (4) ◽  
pp. 597-606 ◽  
Author(s):  
T. Komura ◽  
T. Yamaguchi ◽  
H. Shimatani ◽  
R. Okushio
Keyword(s):  
Charge Transfer ◽  
Impedance Spectroscopy ◽  
Charge Transfer Resistance ◽  
Gold Electrodes ◽  
Transfer Resistance ◽  
Interfacial Charge Transfer ◽  
Interfacial Charge

scholarly journals Electrochemical Impedance Spectroscopy on the Performance Degradation of LiFePO4/Graphite Lithium-Ion Battery Due to Charge-Discharge Cycling under Different C-Rates

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4507 ◽  
Author(s):  
Yusuke Abe ◽  
Natsuki Hori ◽  
Seiji Kumagai
Keyword(s):  
Charge Transfer ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Performance Degradation ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Charge Discharge

Lithium-ion batteries (LIBs) using a LiFePO4 cathode and graphite anode were assembled in coin cell form and subjected to 1000 charge-discharge cycles at 1, 2, and 5 C at 25 °C. The performance degradation of the LIB cells under different C-rates was analyzed by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy. The most severe degradation occurred at 2 C while degradation was mitigated at the highest C-rate of 5 C. EIS data of the equivalent circuit model provided information on the changes in the internal resistance. The charge-transfer resistance within all the cells increased after the cycle test, with the cell cycled at 2 C presenting the greatest increment in the charge-transfer resistance. Agglomerates were observed on the graphite anodes of the cells cycled at 2 and 5 C; these were more abundantly produced in the former cell. The lower degradation of the cell cycled at 5 C was attributed to the lowered capacity utilization of the anode. The larger cell voltage drop caused by the increased C-rate reduced the electrode potential variation allocated to the net electrochemical reactions, contributing to the charge-discharge specific capacity of the cells.

Thermal transitions in hydrated layer-by-layer assemblies observed using electrochemical impedance spectroscopy

Soft Matter ◽  
2014 ◽  
Vol 10 (34) ◽  
pp. 6467-6476 ◽  
Author(s):  
Choonghyun Sung ◽  
Katelin Hearn ◽  
Jodie Lutkenhaus
Keyword(s):  
Charge Transfer ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
Thermal Transition ◽  
Layer By Layer ◽  
Thermal Transitions ◽  
Transfer Resistance ◽  
Hydrated Layer

Layer-by-layer assemblies exhibit increased conductivity and decreased charge transfer resistance upon heating through the thermal transition.

scholarly journals State-of-Health of Li-ion Battery Estimation Based on the Efficiency of the Charge Transfer Extracted from Impedance Spectra

2022 ◽  
Vol 12 (2) ◽  
pp. 885
Author(s):  
Ahmed Yahia Kallel ◽  
Viktor Petrychenko ◽  
Olfa Kanoun
Keyword(s):  
Charge Transfer ◽  
Impedance Spectroscopy ◽  
Impedance Spectrum ◽  
Charge Transfer Resistance ◽  
Model Parameters ◽  
State Of Health ◽  
Battery Cell ◽  
Transfer Resistance ◽  
Detailed Model ◽  
Cell Parameters

Several studies show that impedance spectroscopy is a suitable method for online battery diagnosis and State-of-Health (SoH) estimation. However, the most common method is to model the acquired impedance spectrum with equivalent circuits and focus on the most sensitive parameters, namely the charge-transfer resistance. This paper introduces first a detailed model of a battery cell, which is then simplified and adapted to the observable spectrum behavior. Based on the physical meaning of the model parameters, we propose a novel approach for SoH assessment combining parameters of the impedance spectrum by building the ratio of the solid electrolyte interphase (SEI) resistance to the total resistance of SEI and the charge transfer. This ratio characterizes the charge-transfer efficiency at the electrodes’ surfaces and should decrease systematically with SoH. Four different cells of the same type were cycled 400 times for the method validation, and impedance spectroscopy was performed at every 50th cycle. The results show a systematic correlation between the proposed ratio and the number of cycles on individual cell parameters, which build the basis of a novel online method of SoH assessment.

Effect of soluble sulfur species on the electrochemical behavior of lithium–sulfur batteries with dual-phase electrolytes

2019 ◽  
Vol 3 (8) ◽  
pp. 1966-1970 ◽  
Author(s):  
Chengcheng Zhao ◽  
Hao Yang ◽  
Xiaofei Wang ◽  
Huilan Li ◽  
Chu Qi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Reaction Kinetics ◽  
Electrochemical Behavior ◽  
Charge Transfer Resistance ◽  
Dual Phase ◽  
Transfer Resistance ◽  
Sulfur Species ◽  
Lithium Sulfur Batteries ◽  
Interfacial Charge ◽  
Lithium Sulfur

We report a Li–S system with dual-phase electrolytes by taking advantage of the highly soluble lithium polysulfides (Li2Sn, 2 < n ≤ 8), and it shows an improved reaction kinetics associated with a low interfacial charge transfer resistance.

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