Synthesis and Electrochemical Properties of a LiNi0.7Co0.3O1.9Cl0.1 Cathode Material for Lithium-Ion Battery

2007 ◽  
Vol 336-338 ◽  
pp. 463-465 ◽  
Author(s):  
Xin Lu Li ◽  
Fei Yu Kang ◽  
Yong Ping Zheng ◽  
Xiu Juan Shi ◽  
Wan Ci Shen
Keyword(s):  
Hexagonal Lattice ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Constant Current ◽  
Cyclic Voltammograms ◽  
X Ray Diffraction ◽  
X Ray ◽  
Constant Current Charge ◽  
Initial Cycle ◽  
Partial Oxygen

Partial oxygen in LiNi0.7Co0.3O2 was replaced by chlorine to form LiNi0.7Co0.3O1.9Cl0.1. Phase structure of LiNi0.7Co0.3O1.9Cl0.1 was identified as a pure hexagonal lattice of α-NaFeO2 type by X-ray diffraction. Discharge capacity of LiNi0.7Co0.3O1.9Cl0.1 was 202 mAh/g in initial cycle at 15 mA/g current density in 2.5- 4.3 V potential window. The constant current charge/discharge experiments and cyclic voltammograms showed that chlorine addition was effective to improve reversible capacity and cycle stability of LiNi0.7Co0.3O2.

Synthesis and Electrochemical Properties of LiFe (PO4)(1-x/3)Fx/C as a Cathode Material

2013 ◽  
Vol 827 ◽  
pp. 16-19
Author(s):  
Shi Tao Song ◽  
Su Xia Wu ◽  
Zhi Wei Zhang ◽  
You Shun Peng
Keyword(s):  
Cathode Material ◽  
Effective Means ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Constant Current ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
X Ray ◽  
Constant Current Charge ◽  
Discharge Experiment

on doping is an effective means to improve the performance of LiFePO4 material. In the present study, composites LiFe (PO4)(1-x/3)Fx/C (x=0.00,0.02,0.04,0.06,0.08,0.10) were synthesized by carbothermal reduction method. The as-synthesized samples were characterized by X-ray diffraction and scanning electron microscope, and their electrochemical performances were investigated by constant current charge-discharge experiment. The results indicated that the low concentration F dopant did not affect the structure of LiFePO4 but considerable improved its electrochemical performances. The LiFe (PO4)0.98F0.06/C materials showed better electrochemical performances than LiFePO4/C. At 0.2 C discharging rate, the LiFe (PO4)0.98F0.06/C materials was capable of delivering reversible specific capacity of 165.1 mAh/g, with fairly stable cycleability. The excellent performance indicates that this mix-doped composite was a very promising cathode material for lithium ion batteries.

Cathode Material Li [Li0.2 Mn0.44Ni0.18Co0.18]O2 Synthesized by Molten Salt Method

2013 ◽  
Vol 690-693 ◽  
pp. 981-984
Author(s):  
Guang Xin Fan ◽  
Hui Lian Li ◽  
Shu Pu Dai ◽  
Chuan Xiang Zhang ◽  
Xue Mao Guan ◽  
...  
Keyword(s):  
Molten Salt ◽  
Specific Area ◽  
Constant Current ◽  
Molar Ratio ◽  
Molten Salt Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Structures And Properties ◽  
Constant Current Charge

In this paper, LiOH·H2O and Li2CO3, which were widely used in industry and (Mn0.533Co0.233Ni0.233) (OH)2prepared by ourselves selected as starting materials, series materials of lithium-rich layered material Li [Li0.2Mn0.44Ni0.18Co0.18]O2were obtained by a molten salt method. Their structures and properties of the materials were investigated by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and constant current charge/discharge methods. The effects of different LiOH and Li2CO3molar ratios on the Li [Li0.2Mn0.44Ni0.18Co0.18]O2structures and properties were characterized. The results of the experiments indicate that The structures of the material such as crystal structure, the specific area, particle size distribution, tap densities were controlled by adjusting the proportion of the two lithium sources. Forthermore , when the molar ratio of LiOH and Li2CO3was 3:7, the maximum discharge capacity (214.77 mAhg-1) of the cathode was obtained.

In-Situ X-Ray Diffraction Studies On Lithium- Ion Battery Cathodes

1999 ◽  
Vol 575 ◽  
Author(s):  
Mark A. Rodriguez ◽  
David Ingersoll ◽  
Daniel H. Doughty
Keyword(s):  
Phase Transformation ◽  
Monoclinic Phase ◽  
Hexagonal Lattice ◽  
Lithium Ion ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Doping ◽  
In Situ Xrd

ABSTRACTLiNi0.8Co0.2O2 and LiNiO2 have been characterized in-situ XRD. LiNi0.8Co0.2O2 does not undergo a monoclinic phase transformation but remains a hexagonal lattice throughout the entire charging cycle. It is hypothesized that Co-doping may help stabilize the hexagonal structure.

Fabrication of Electrospun Si/Carbon Composite Nanofibers as Anodes Materials for Lithium-Ion Batteries

2012 ◽  
Vol 532-533 ◽  
pp. 92-96 ◽  
Author(s):  
Hui Min Huang ◽  
Zhu Chi Chen ◽  
Jie Yu
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Nanofibers ◽  
Anode Materials ◽  
Composite Nanofibers ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Carbon Composite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Oxides

Si/carbon nanofibers (Si/CNFs) composite used as the anode materials of lithium-ion battery have been prepared via electrospinning and calcinations treatment. Hydrofluoric acid is used to remove surface oxides of Si particles. SEM observation indicates that silicon particles are uniformly embedded in the carbon nanofibers. X-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDX) and Raman scattering have been used to analysis the composition and phase of the composite materials. The first reversible capacity of the Si/CNFs composite is 1004 mAh/g, and 390 mAh/g has been remained after 100 cycles. Such Si/CNFs composite could be a promising anode material in lithium ion batteries.

Effect of Rare Earth Doping on Electrochemical Properties of Fe2O3 Nanoparticle for Supercapacitor

2018 ◽  
Vol 281 ◽  
pp. 743-747
Author(s):  
Wei Kang Yan ◽  
Jian Qiang Bi ◽  
Wei Li Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Constant Current ◽  
Rare Earth Doping ◽  
X Ray Diffraction ◽  
Super Capacitor ◽  
X Ray ◽  
Constant Current Charge ◽  
Discharge Method ◽  
Structure And Microstructure

Fe2O3 nanoparticle was prepared by a hydrothermal method, and the influence of rare earth elements (Y3+, Nd3+ and La3+) on the electrochemical performance was studied. The crystal structure and microstructure of the synthesized lithium zinc ferrite were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM). The results show that the powder is well crystallized and the particles are mostly irregular.The electrochemical property was characterized via cyclic voltammetry (CV) and constant current charge-discharge method. The capacitance of the Fe2O3 nanoparticle is 258.3 F/g, 342.7 F/g after doping Y3+ ,337.1 F/g after doping Nd3+and 331.2 F/g after doping La3 +. The results show that the rare earth elements (Y3+, Nd3+ and La3+) after the specific capacitance has increased, more suitable for super capacitor materials.

In Situ Growth of Mesoporous NiO Nanoplates on Graphene Matrix as Anode Material for Lithium-Ion Batteries

2014 ◽  
Vol 905 ◽  
pp. 56-60
Author(s):  
Dan Feng Qiu ◽  
Yong Jun Xia ◽  
He Qing Ma ◽  
Gang Bu
Keyword(s):  
Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Lithium Ion ◽  
Constant Current ◽  
Homogeneous Distribution ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Constant Current Charge

Graphene-NiO nanocomposites were prepared via a solvothermal method. The nanostructure and morphology of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). SEM and TEM results indicated that NiO nanoplates distributed homogeneously on graphene sheets. The electrochemical properties of the samples as active anode materials for lithium-ion batteries were examined by constant current charge-discharge cycling. With graphene as conductive matrix, homogeneous distribution of NiO nanoplates can be ensured and volume changes of thenanocomposite during the charge and discharge processes can be accomodated effectively, which results in good electrochemical performance of the composites.

Synthesis of Different Molybdenum Disulfide Nanostructures and their Applicability in Lithium Ion Batteries with Ionic Liquid Electrolytes

2013 ◽  
Vol 1496 ◽  
Author(s):  
Daniel Albrecht ◽  
Hendrik Wulfmeier ◽  
Svetlozar Ivanov ◽  
Andreas Bund ◽  
Holger Fritze
Keyword(s):  
Thin Film ◽  
Lithium Ion Batteries ◽  
Molybdenum Disulfide ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
X Ray Diffraction ◽  
Characterization Methods ◽  
Maximum Capacity ◽  
X Ray ◽  
Morphology Characterization

ABSTRACTMolybdenum disulfide (MoS2) nanostructures with three different morphologies are synthesized and tested with respect to their applicability in lithium ion batteries. Thereby, electrolytes based on ionic liquids are used. The electrochemical performance of nanostructures and thin films is compared to evaluate the influence of the morphology. Characterization methods include X-Ray diffraction (XRD), cyclic voltammetry (CV), galvanostatic cycling and thin film calorimetry. The thin film and the nanostructured samples show a reversible capacity of 525 mAh/g and a maximum capacity 225 mAh/g, respectively.

scholarly journals Preparation and Study of Waterborne Asphalt Pavement Maintenance Agent

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Yuan Chunfei
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion ◽  
Retention Rates ◽  
Constant Current ◽  
Capacity Retention ◽  
X Ray ◽  
Synthesis Conditions ◽  
Pavement Maintenance ◽  
Effi Ciency ◽  
Constant Current Charge

The precursor Ni0.76Co0.1Mn0.1 (OH) 2 was prepared by coprecipitation method. The precursor was mixed withMg (OH) 2 / Zn (NO3) 2 / TiO2 and LiOH.H2O, Li2CO3 to synthesize doped lithium Ion layer positive electrodematerial Li [Ni0.8-xCo0.1Mn0.1Mx] O2 (x = 0.04). The effects of synthesis conditions on the chemical propertiesof the composites were discussed. The synthesized samples were prepared by scanning electron microscopy (SEM),thermogravimetry - diff erential thermal analysis (TG / DTA), X - ray diff raction (XRD) and constant current charge- Testing and characterization. The results show that the crystallinity of Li [Ni0.8-xCo0.1Mn0.1Mx] O2 (x = 0.04)prepared at 900 ℃ for 20 h is good, and it has good layered structure. The properties of the doped elements The resultsshow that the electrochemical performance of the samples with Mg and Zn is good, and the fi rst discharge capacity is0.1.5mA.h / g and 144.2 mA.h / g (2.8 ~ 4.6 V vs Li + / Li ), The fi rst charge and discharge effi ciency was 51.8% and58.1% respectively, and the capacity retention rates after 8 and 10 cycles were 92.4% and 78.5% respectively. The fi rstdischarge capacity of the Ti doped sample was 51.3 mA.h / G, poor electrochemical performance.

Preparation, Characterization and Electrochemical Property of ZnCl2-doped Carbon Nanometer Material as the Anode of Lithium-ion Battery

2004 ◽  
Vol 822 ◽  
Author(s):  
D.F. Zhou ◽  
Y.L. Zhao ◽  
Y.G. Chen ◽  
X.Y. Zhang ◽  
R.S. Wang
Keyword(s):  
Lithium Ion Battery ◽  
Phenolic Resin ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Nanometer Material ◽  
Average Size ◽  
Charge Discharge

AbstractPhenolic resin-based nanoscopic carbonaceous materials have been prepared by doping different proportions of ZnCl2 into phenolic resin (PR) precursor at various heat-treatment temperatures and characterized by means of Brunner-Emmett-Teller method (BET), X-ray diffraction (XRD), transmission electron microscopy (TEM) and Raman spectroscopy analyses. The results show that as the ratio of PR to ZnCl2 is 1:3, the average size of grains and apertures are about from 40 to 60 nm and 3.86 nm, respectively, reaching nanometer level. When this material is used as electrode material of lithium ion battery, the reversible capacity the battery could be kept at 370 mA•h•g−1 after 10 charge/discharge cycles.

Large Reversible Capacity of Graphene Electrodes Used in Lithium-Ion Batteries

2013 ◽  
Vol 320 ◽  
pp. 114-118
Author(s):  
Li Zhong Bai ◽  
Dong Lin Zhao ◽  
Ji Ming Zhang ◽  
Feng Li
Keyword(s):  
Electron Microscope ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
X Ray Diffraction ◽  
Natural Graphite ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ir And Raman ◽  
A Current

High quality graphene sheets (GSs) were prepared from natural graphite by oxidation, rapid thermal expansion and ultrasonic treatment. The morphology and structure of GSs were systematically investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier tansform infrared spectroscopy (FT-IR) and Raman spectroscopy. It was found that the GSs electrode used in lithium-ion battery (LIB) exhibited a relatively high reversible capacity of 902 mA h/g at a current density of 50 mA/g. After 50 cycles, the reversible capacity was still kept at 734 mA h/g.

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