In-situ EIS to Investigate Influence of Conductive Additive Addition Rate on Charge Transfer Resistance of Lithium Ion Batteries

2019 ◽  
Keyword(s):  
Charge Transfer ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Conductive Additive ◽  
Addition Rate

scholarly journals Enhanced Electrochemical Performance of LiFePO4 Originating from the Synergistic Effect of ZnO and C Co-Modification

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 12
Author(s):  
Xiaohua Chen ◽  
Yong Li ◽  
Juan Wang
Keyword(s):  
Zinc Oxide ◽  
Charge Transfer ◽  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Electron Conductivity ◽  
Spherical Particles ◽  
Commercial Application ◽  
Transfer Resistance

Olivine-structure LiFePO4 is considered as promising cathode materials for lithium-ion batteries. However, the material always sustains poor electron conductivity, severely hindering its further commercial application. In this work, zinc oxide and carbon co-modified LiFePO4 nanomaterials (LFP/C-ZnO) were prepared by an inorganic-based hydrothermal route, which vastly boosts its performance. The sample of LFP/C-xZnO (x = 3 wt%) exhibited well-dispersed spherical particles and remarkable cycling stability (initial discharge capacities of 138.7 mAh/g at 0.1 C, maintained 94.8% of the initial capacity after 50 cycles at 0.1 C). In addition, the cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) disclose the reduced charge transfer resistance from 296 to 102 Ω. These suggest that zinc oxide and carbon modification could effectively minimize charge transfer resistance, improve contact area, and buffer the diffusion barrier, including electron conductivity and the electrochemical property. Our study provides a simple and efficient strategy to design and optimize promising olivine-structural cathodes for lithium-ion batteries.

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.

scholarly journals State-of-Charge Monitoring by Impedance Spectroscopy during Long-Term Self-Discharge of Supercapacitors and Lithium-Ion Batteries

Batteries ◽  
2018 ◽  
Vol 4 (3) ◽  
pp. 35 ◽  
Author(s):  
Peter Kurzweil ◽  
Mikhail Shamonin
Keyword(s):  
Impedance Spectroscopy ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
The State ◽  
State Of Charge ◽  
Transfer Resistance ◽  
Storage Devices ◽  
Electrochemical Storage

Frequency-dependent capacitance C(ω) is a rapid and reliable method for the determination of the state-of-charge (SoC) of electrochemical storage devices. The state-of-the-art of SoC monitoring using impedance spectroscopy is reviewed, and complemented by original 1.5-year long-term electrical impedance measurements of several commercially available supercapacitors. It is found that the kinetics of the self-discharge of supercapacitors comprises at least two characteristic time constants in the range of days and months. The curvature of the Nyquist curve at frequencies above 10 Hz (charge transfer resistance) depends on the available electric charge as well, but it is of little use for applications. Lithium-ion batteries demonstrate a linear correlation between voltage and capacitance as long as overcharge and deep discharge are avoided.

Electrochemical Decomposition of Poly(Vinylidene Fluoride) Binder for a Graphite Negative Electrode in Lithium-Ion Batteries

2017 ◽  
Vol 893 ◽  
pp. 127-131 ◽  
Author(s):  
Min Ji Kim ◽  
Chang Hee Lee ◽  
Mun Hui Jo ◽  
Soon Ki Jeong
Keyword(s):  
Lithium Ion Batteries ◽  
Vinylidene Fluoride ◽  
Electrochemical Impedance ◽  
Negative Electrode ◽  
Reduction Process ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Electrode Resistance ◽  
Poly Vinylidene Fluoride

To clarify the electrochemical decomposition of poly (vinylidene fluoride) (PVdF) used as a binder for lithium-ion batteries while simultaneously verifying the correlation between electrode resistance and the PVdF content in graphite negative electrodes, in this study, we applied lithium bis (trifluoromethanesulfonyl) imide, which suppresses graphite exfoliation, as a salt. As a result, the electrochemical decomposition of PVdF was observed at a higher potential than that at which the electrolyte was decomposed during the reduction process. Additionally, this study demonstrated (through electrochemical impedance spectroscopy analysis) that electrode resistances such as solid electrolyte interface and charge transfer resistance proportionally increased with the PVdF content.

Low Temperature Synthesis of Li4Ti5O12 Nanowire as Anode for Lithium Ion Batteries

2020 ◽  
Vol 17 (2) ◽  
pp. 1167-1172
Author(s):  
Lukman Noerochim ◽  
Widyastuti ◽  
Haniffudin Nurdiansah ◽  
Bambang Prihandoko
Keyword(s):  
Low Temperature ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Diffusion Path ◽  
Charge Transfer Resistance ◽  
Holding Time ◽  
Synthesis Process ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Transfer Resistance

Low temperature synthesis process of Li4Ti5O12 nanowire is successfully performed by hydrothermal method at temperature 100 °C with holding time for 18, 24 and 30 h. XRD results show the presence of two phases are Li4Ti5O12 and TiO2. The morphology of Li4Ti5O12 nanowire is clearly observed by SEM with the length nanowire of 1.391–5.865 μm, and diameter of 19.43–97.14 nm. The Li4Ti5O12 with holding time of 24 h has the highest specific discharge capacity of 66.287 mAh/g. While the capacity decrease of 3.22% after 30 cycle. It is attributed to the largest surface area enhancing smallest diffusion path for Li+ ion. Furthermore, the dual-phase Li4Ti5O12–Ti12 with holding time of 24 h has the most excellent conductivity due to the low of charge-transfer resistance. Therefore, the Li4Ti5O12 nanowire can be a promising material as anode for lithium-ion batteries.

MoO3/CNTs Loading in Separator for Performance-Improving Current-Collector-Free Lithium Ion Batteries

2020 ◽  
Vol 15 (2) ◽  
pp. 204-211
Author(s):  
Peng Peng ◽  
Jiewei Chen ◽  
Kai Niu ◽  
Zhuohai Liu ◽  
Hao Huang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Low Cost ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Current Collector ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
High Specific Capacity ◽  
Composite Separator ◽  
Novel Strategy

A novel strategy for structural design of current-collector-free lithium ion batteries (LIBs) has been proposed, MoO3/CNTs loading on the single side of a separator by a simple spin-coating method. LIBs with such a MoO3-based composite separator eliminate the need for metal current collectors and exhibit an extra high specific capacity (0.2C, ∼1200 mA h g–1). Faster ion transport and lower charge transfer resistance (Rct) of the composite separator were proved compared with the traditional MoO3-based electrode, which results in the increased special capacity. In addition, the pseudocapacitive effect caused by vacancies and narrow interval in the MoO3/CNTs materials also contributes to the high specific capacity of the batteries. The highly efficient ion and electron transport ability of the composite separator were proved in this study, and such a novel design strategy would be an alternative for low-cost LIBs.

scholarly journals Aggregation-Morphology-Dependent Electrochemical Performance of Co3O4 Anode Materials for Lithium-Ion Batteries

Molecules ◽  
2019 ◽  
Vol 24 (17) ◽  
pp. 3149 ◽  
Author(s):  
Linglong Kong ◽  
Lu Wang ◽  
Deye Sun ◽  
Su Meng ◽  
Dandan Xu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Retention Rate ◽  
Lithium Ion ◽  
Charge Transfer Resistance ◽  
Superior Performance ◽  
Electrode Structure ◽  
Transfer Resistance

The aggregation morphology of anode materials plays a vital role in achieving high performance lithium-ion batteries. Herein, Co3O4 anode materials with different aggregation morphologies were successfully prepared by modulating the morphology of precursors with different cobalt sources by the mild coprecipitation method. The fabricated Co3O4 can be flower-like, spherical, irregular, and urchin-like. Detailed investigation on the electrochemical performance demonstrated that flower-like Co3O4 consisting of nanorods exhibited superior performance. The reversible capacity maintained 910.7 mAh·g−1 at 500 mA·g−1 and 717 mAh·g−1 at 1000 mA·g−1 after 500 cycles. The cyclic stability was greatly enhanced, with a capacity retention rate of 92.7% at 500 mA·g−1 and 78.27% at 1000 mA·g−1 after 500 cycles. Electrochemical performance in long-term storage and high temperature conditions was still excellent. The unique aggregation morphology of flower-like Co3O4 yielded a reduction of charge-transfer resistance and stabilization of electrode structure compared with other aggregation morphologies.

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