Carbon Nanotubes on the Performance of Al3+ Doped α-Nickel Hydroxide

2011 ◽  
Vol 287-290 ◽  
pp. 1416-1419
Author(s):  
Chang Jiu Liu ◽  
Pei Pei Li ◽  
Liang Hua Huang
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Performance ◽  
Nickel Hydroxide ◽  
Electrochemical Impedance ◽  
Electrochemical Reaction ◽  
Cycling Stability ◽  
Specific Discharge ◽  
Charge Discharge

The effect of carbon nanotubes (CNTs) addition on the electrochemical performance of Al doped α-nickel hydroxide is studied. The microstructure and electrochemical performance of the prepared samples are characterized by XRD,SEM, electrochemical impedance spectroscopy, charge-discharge at different rate, and Charge-discharge cycling stability tests. The results show that the addition of CNTs could decrease the electrochemical reaction impedance dramatically, increase the specific discharge capacity at higher rate, and improve the Charge-discharge cycling stability reversibility.

Synthesis and Electrochemical Performance of Amorphous Nickel Hydroxide Codoped with Fe3+ and PO43-

2011 ◽  
Vol 197-198 ◽  
pp. 1285-1288 ◽  
Author(s):  
Chang Jiu Liu ◽  
Shi Juan Chen ◽  
Dan Ma ◽  
Yan Wei Li
Keyword(s):  
Electrochemical Performance ◽  
Nickel Hydroxide ◽  
Electrochemical Impedance ◽  
Structural Defects ◽  
Precipitation Method ◽  
Rapid Freezing ◽  
Electrochemical Reversibility ◽  
Specific Discharge ◽  
Micro Emulsion ◽  
Charge Discharge

Amorphous nickel hydroxide powder codoped with Fe3+ and PO43- was synthesized by micro-emulsion precipitation method combined with rapid freezing technique. The microstructures of the prepared samples were characterized by XRD, SEM, EDS, and Raman spectra. The electrochemical performance of the prepared samples was analyzed by cyclic voltammetry, electrochemical impedance spectroscopy, and charge-discharge tests. The results showed that this amorphous nickel hydroxide codoped with Fe3+ and PO43- resulted in more structural defects within the nickel hydroxide. The Fe3+ and PO43- codoping could increase the specific discharge capacity and improve the electrochemical reversibility of the amorphous nickel hydroxide.

Structure and Electrochemical Performance of Amorphous Nickel Hydroxide Doped with La and Al

2010 ◽  
Vol 663-665 ◽  
pp. 1217-1220
Author(s):  
Chang Jiu Liu ◽  
Chun Xiao Xing ◽  
Shi Juan Chen ◽  
Yan Wei Li
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Performance ◽  
Nickel Hydroxide ◽  
Electrochemical Impedance ◽  
Chemical Precipitation ◽  
Structural Defects ◽  
Rapid Freezing ◽  
Freezing Method ◽  
Electrochemical Reversibility

Amorphous nickel hydroxide powders doped with rare earth La3+ and Al3+ were synthesized by the combined chemical precipitation and rapid freezing method. The microstructure of the samples was characterized by XRD and Raman spectra. The electrochemical performance of the prepared samples was analyzed by electrochemical impedance spectroscopy and charge-discharge tests. The results showed that this amorphous nickel hydroxide codoped with La3+ and Al3+ had more structural defects than those of the undoped amorphous nickel hydroxide and La3+ singly doped amorphous nickel hydroxide. These abundant structural defects with La3+ and Al3+ codoped amorphous nickel hydroxide decreased the electrochemical impedance spectroscopy and improved the electrochemical reversibility of the amorphous nickel hydroxide electrode.

Understanding the electrochemical potential and diffusivity of MnO/C nanocomposites at various charge/discharge states

2019 ◽  
Vol 7 (13) ◽  
pp. 7831-7842 ◽  
Author(s):  
Chaofeng Liu ◽  
Haoyu Fu ◽  
Yanyan Pei ◽  
Jiandong Wu ◽  
Vivek Pisharodi ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Crystal Field ◽  
Electrochemical Impedance ◽  
Electrochemical Potential ◽  
Field Analysis ◽  
Kinetics Of ◽  
Charge Discharge

Electrochemical potential and lithiation kinetics of MnO/C nanocomposites were investigated by crystal field analysis and electrochemical impedance spectroscopy.

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 Multi-walled carbon nanotubes/nano-Ag-TiO2 membrane DNA electrochemical biosensor

2019 ◽  
Author(s):  
Zhongguo Zheng ◽  
Lisa Schultz ◽  
John Smith
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Biosensor ◽  
Electrochemical Impedance ◽  
Carbon Paste ◽  
Dna Electrochemical Biosensor ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Paste Electrode

AbstractA highly sensitive DNA electrochemical biosensor was prepared based on multi-walled carbon nanotube/nano-Ag-TiO2 composite membrane. The Ag-TiO2 composite is mixed with a suitable amount of multi-walled carbon nanotubes (MWNT) dispersed in N,N-dimethylformamide to form a uniform and stable mixed solution, which is applied onto the surface of the bare carbon paste electrode. A MWNT/Ag-TiO2 modified carbon paste electrode was prepared. The large specific surface area and good electron transport properties of carbon nanotubes have a good synergistic effect on the good biocompatibility of Ag-TiO2 nanocomposites and excellent adsorption capacity of DNA, which significantly improves the immobilization and DNA hybridization of DNA probes. Detection sensitivity. The preparation of the sensing membrane and the immobilization and hybridization of DNA were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The exogenous glufosinate acetyltransferase gene fragment of transgenic plants was detected by electrochemical impedance spectroscopy. The linear range was 1. 0 × 10 - 11 ∼1. 0 × 10 - 6 mol / L. The detection limit was 3. 12 × 10 - 12 mol / L.

scholarly journals STUDI SIFAT ELEKTROKIMIA SEL BATERAI SEKUNDER POUCHCELL LITHIUM ION LIFEPO4/GRAPHITE APLIKASI DAYA TINGGI

2017 ◽  
Vol 2 (3) ◽  
pp. 173-178
Author(s):  
Achmad Subhan ◽  
Bambang Prihandoko
Keyword(s):  
Life Cycle ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
High Power ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Graphite Powder ◽  
Liquid Electrolyte ◽  
Cyclic Voltametry ◽  
Charge Discharge

Abstrak Telah dilakukan pembuatan lembaran katoda dari serbuk LiFePO4 komersial dan anoda dari serbuk Graphite. Lembaran difabrikasi membentuk sel penuh baterai dengan tipe sampel uji berbentuk Pouchcell. Konfigurasi sel adalah LiFePO4//LiPF6//graphite, LiPF6 digunakan sebagai elektrolit cair. Karakterisasi sel dilakukan meliputi uji cyclic voltrametry, charge discharge dan EIS (electrochemical Impedance Spectroscopy. Nilai yg dihasilkan adalah kapasitas mencapai sekitar 80 mAh/gr, dengan tegangan Voc stabil pada nilai 3.28 V. Nilai discharge capacity yang bisa diambil hingga 5C  lebih dari 40%, dengan life cycle pada 50 siklus kehilangan kapasitas hanya kurang dari 5%. Kata-kata kunci: pouchcell, cyclic voltametry, electrochemical impedance spectroscopy, baterai high power. Abstract In this work, have been fabricated cathode electrode from  LiFePO4 powder and anode from  commercial Graphite powder. Full cell batteries fabricated in  Pouchcell shaped test samples. Lithium ion  cell configuration are LiFePO4  // LiPF6 // graphite, 1 M LiPF6 in EC/DEC is used as the liquid electrolyte. Cell batteries Perfomance characterized by some  tests conducted on the cyclic voltrametry, charge-discharge and EIS (electrochemical impedance spectroscopy. The result  value are the capacity  reached  approximately 80 mAh / g, with the voltage Voc perfectly stable  at 3.28 V. The discharged capacity  can be taken up to 5C almost over 40% , with  after 50 cycles for life cycle test the capacity loss is retain still   95% at 0.33C. Keywords: pouchcell, cyclic voltametry, electrochemical impedance spectroscopy, high power battery.

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