Electrochemical Characteristics of Nano-Silicon/Graphite Composite for the Anode Material of Lithium Secondary Batteries

2006 ◽  
Vol 510-511 ◽  
pp. 1074-1077 ◽  
Author(s):  
Joong Kee Lee ◽  
Tae Jin Park
Keyword(s):  
Specific Capacity ◽  
Composite Layer ◽  
Raw Material ◽  
Cycle Performance ◽  
Electrochemical Characteristics ◽  
Graphite Composite ◽  
Lithium Secondary Batteries ◽  
Graphite Particles ◽  
Silicon Carbon ◽  
Spray Method

Silicon coated graphite particles prepared by gas suspension spray method were used as a raw material for the battery anode, which showed high specific capacity and good cycle performance. The improvement of electrochemical performance seems to be due to the formation of amorphous silicon-carbon black composite layer on the surface of the graphite particles. It has a stable structure under repeated volume expansion and contraction.

Wood-based activated carbons for supercapacitors with organic electrolyte

Holzforschung ◽  
2015 ◽  
Vol 69 (6) ◽  
pp. 777-784 ◽  
Author(s):  
Galina Dobele ◽  
Aleksandrs Volperts ◽  
Galina Telysheva ◽  
Aivars Zhurinsh ◽  
Daria Vervikishko ◽  
...  
Keyword(s):  
Activated Carbons ◽  
Specific Capacity ◽  
Total Pore Volume ◽  
Synthesis Temperature ◽  
Raw Material ◽  
Organic Electrolyte ◽  
Electrochemical Characteristics ◽  
Activation Temperature ◽  
Synthesis Conditions ◽  
Ohmic Losses

Abstract The thermocatalytical synthesis conditions required for the activation of wood charcoal with NaOH in terms of the formation of pores in its structure were investigated. The present study was conducted to explore the potential application of activated carbons as electrodes in supercapacitors with organic electrolyte. The total pore volume and micro- and mesopore ratio were controlled by the activation temperature and alkali addition rate. The working characteristics of carbon electrodes (e.g., specific capacity and ohmic losses) in supercapacitors are strongly influenced by the properties of the pores in their structures. Herein, the optimal ratio of raw material to activator and activation temperature are established: an increase in the ratio of NaOH to carbonizate rate by a factor of 2 and setting the synthesis temperature at 700°C positively influence the electrochemical characteristics of supercapacitors and provide them with specific capacities of up to 160 F g-1.

scholarly journals Molybdenum disulfide / mesoporous carbon nanocomposite as electrode material for supercapasitors

Energetika ◽  
2016 ◽  
Vol 61 (3-4) ◽  
Author(s):  
Lyudmyla Shyyko ◽  
Volodymyr Kotsyubynsky ◽  
Ivan Budzulyak ◽  
Bogdan Rachiy
Keyword(s):  
Electrode Material ◽  
Mesoporous Carbon ◽  
Specific Capacity ◽  
Synergetic Effect ◽  
Internal Resistance ◽  
Raw Material ◽  
Electrochemical Characteristics ◽  
Molybdenum Disulphide ◽  
Hybrid Supercapacitors ◽  
Carbon Nanocomposite

The article describes the features of MoS2/mesoporous carbon nanocomposite creation and application as an electrode material for hybrid supercapacitors. The combination of these two materials improved the electrochemical characteristics in comparison with molybdenum disulphide or mesoporous carbon on their own; in particular the synergetic effect between them led to the reduction of internal resistance and increase of electric conductivity that are reflected in the maximum power of the capacitor. In spite of a large surface area of the mesoporous carbon obtained from the raw material of plant origin (2200 m2 g–1), the synthesized nanocomposite (430 m2 g–1) has almost twice higher specific capacity (57 Fg–1 and 110 Fg–1, respectively) due to the summary effect of EDL and faradaic processes in the material. The samples were characterized by X-ray difractometry (XRD), transmission electron microscopy (TEM), porosimetry, impedance spectroscopy, voltammetry, and chronopotentiometry.

scholarly journals Solvents Adjusted Pure Phase CoCO3 as Anodes for High Cycle Stability

2020 ◽  
Author(s):  
Liming Liu ◽  
X.X. Huang ◽  
Zengyan Wei ◽  
Xiaoming Duan ◽  
Bo Zhong ◽  
...  
Keyword(s):  
Particle Size ◽  
High Current Density ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cycle Performance ◽  
Electrochemical Characteristics ◽  
Cycle Stability ◽  
Pure Phase ◽  
Small Primary ◽  
High Theoretical Capacity

Abstract CoCO3 with high theoretical capacity has been considered as a candidate anode for the next generation of lithium-ion batteries. However, the electrochemical characteristics of CoCO3 itself, especially the cycle stability under high current density, hindering its application. Herein, pure phase CoCO3 particles with different particle and pore sizes were prepared by adjusting the solvents. CoCO3 synthesized with diethylene glycol (DG-CC) as the reaction solvent shows the best electrochemical performance for the particle size of about 0.85 µm, which because the small primary particle size within and the mesopores maintain the structural stability. A high specific capacity of after 1000 cycles was achieved, and an excellent capacity retention was presented. The capacity provided by different electrochemical reactions and the impedance of DG-CC under different cycles were further compared. Those results provide an important reference for the structural design and stable cycle performance of pure CoCO3.

Effect of Phosphorus Doping into the Silicon as an Anode Material for Lithium Secondary Batteries

2007 ◽  
Vol 26-28 ◽  
pp. 333-336 ◽  
Author(s):  
Myung Ho Kong ◽  
Dong Jin Byun ◽  
Joong Kee Lee
Keyword(s):  
Electrical Resistivity ◽  
Anode Material ◽  
Anode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Carbonaceous Material ◽  
Cycle Performance ◽  
Lithium Secondary Batteries ◽  
High Electrical Resistivity ◽  
Silicon Based

Carbonaceous material has been used as an anode in lithium-ion secondary batteries due to their good stability during charging and discharging. But this material has the problems like irreversible capacity and low specific capacity that is about 372mAh/g. Because of the problems as stated above, silicon-based materials have been reported as possible anode materials to replace carbon. But they have high electrical resistivity and large volume changes associated with alloying and dealloying of lithium during electrochemical cycling. This study is performed to obtain higher capacity of anode material with a good cycle performance and to reduce electrical resistivity. It is expected that phosphor doping silicon and graphite mixture exhibit higher capacity than that of raw graphite and the doping of phosphorous will be able to decrease electrical resistivity of anode materials.

Preparation of NiO Microspheres by Hydrothermal Method and its Electrochemical Capacitive Properties

2015 ◽  
Vol 814 ◽  
pp. 81-85 ◽  
Author(s):  
Qian Qian Li ◽  
Run Hua Fan ◽  
Ke Lan Yan ◽  
Kai Sun ◽  
Xu Ai Wang ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Electrochemical Impedance ◽  
Specific Capacity ◽  
Rate Capability ◽  
Average Diameter ◽  
Three Dimensions ◽  
Electrochemical Characteristics ◽  
X Ray Diffraction ◽  
High Specific Capacity ◽  
Capacitive Properties

The precursor Ni (OH)2 was synthesized by a simple hydrothermal method with hexamethylenetetramine ((CH2)6N4) as precipitant and template, and then NiO was gained after calcination. The phase and morphology of the synthesized product were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the electrochemical capacitive characterization was performed using cyclic voltammetry (CV), chronopotentiometry and electrochemical impedance spectroscopy (EIS) in a 6mol/L KOH aqueous solution electrolyte. The result shows that spherical NiO without impurity was synthesized, the average diameter of the spheres is 5 um and these spheres were constructed by the interactive arrangement of many nanoflakes in three dimensions. This kind of NiO shows the typical electrochemical characteristics of pseudo capacitance with high specific capacity and excellent rate capability. The specific capacity can reach 515F/g at the current density of 1A/g

Potato Peel Based Carbon–Sulfur Composite as Cathode Materials for Lithium Sulfur Battery

2021 ◽  
Vol 21 (12) ◽  
pp. 6243-6247
Author(s):  
Arenst Andreas Arie ◽  
Shealyn Lenora ◽  
Hans Kristianto ◽  
Ratna Frida Susanti ◽  
Joong Kee Lee
Keyword(s):  
Cathode Materials ◽  
Porous Carbon ◽  
Chemical Activation ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Electrochemical Characteristics ◽  
Potato Peel ◽  
Lithium Sulfur Battery ◽  
Sulfur Battery ◽  
Lithium Sulfur

Lithium sulfur battery has become one of the promising rechargeable battery systems to replace the conventional lithium ion battery. Commonly, it uses carbon–sulfur composites as cathode materials. Biomass based carbons has an important role in enhancing its electrochemical characteristics due to the high conductivity and porous structures. Here, potato peel wastes have been utilized to prepare porous carbon lithium sulfur battery through hydrothermal carbonization followed by the chemical activation method using KOH. After sulfur loading, as prepared carbon–sulfur composite shows stable coulombic efficiencies of above 98% and a reversible specific capacity of 804 mAh g−1 after 100 cycles at current density of 100 mA g−1. These excellent electrochemical properties can be attributed to the unique structure of PPWC showing mesoporous structure with large specific surface areas. These results show the potential application of potato peel waste based porous carbon as electrode’s materials for lithium sulfur battery.

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