Synthesis of MoS2/C Submicrosphere by PVP-Assisted Hydrothermal Method for Lithium Ion Battery

2012 ◽  
Vol 531 ◽  
pp. 471-477 ◽  
Author(s):  
Hao Luo ◽  
Ling Zhi Zhang ◽  
Lu Yue
Keyword(s):  
Hydrothermal Reaction ◽  
Specific Capacity ◽  
Sodium Molybdate ◽  
Lithium Ion ◽  
Charge Capacity ◽  
X Ray ◽  
Structure And Morphology ◽  
Transmission Electron ◽  
Scanning Electron ◽  
Better Than

Molybdenum disulfide/carbon (MoS2/C) submicrosphere was synthesized through a PVP-assisted hydrothermal reaction of sodium molybdate and thiourea (CS(NH2)2), The structure and morphology of MoS2 composites were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The lithium intercalation/de-intercalation behavior of as-prepared MoS2 submicrosphere electrode was also investigated. It was found that the MoS2 submicrosphere electrode exhibited the best electrochemical performance, retaining a specific capacity of 575mAh/g after 100 cycles, with higher first charge capacity (1037 mAh/g), which was better than those of the MoS2 prepared without PVP

Electrochemical Properties of Li0.99Gd0.01FePO4/C Composite Cathode for Lithium-Ion Batteries

2010 ◽  
Vol 146-147 ◽  
pp. 1233-1237
Author(s):  
Bin Sun ◽  
Yi Feng Chen ◽  
Kai Xiong Xiang ◽  
Wen Qiang Gong ◽  
Han Chen
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Composite Cathode ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Capacity Loss ◽  
Lattice Doping ◽  
Scanning Electron

Li0.99Gd0.01FePO4/C composite was prepared by solid-state reaction, using particle modification with amorphous carbon from the decomposition of glucose and lattice doping with supervalent cation Gd3+. All samples were characterized by X-ray diffraction, scanning electron microscopy, multi-point Brunauer Emmett and Teller methods. The electrochemical tests show Li0.99Gd 0.01FePO4/C composite obtains the highest discharge specific capacity of 154 mAh.g-1 at C/10 rate and the best rate capability. Its specific capacity reaches 131 mAh.g-1 at 2 C rate. Its capacity loss is only 14.9 % when the rate varies from C/10 to 2 C.

Facile Synthesis of Tremella-Like Li3V2(PO4)3/C Composite Cathode Materials Based on Oroxylum for Use in Lithium-Ion Batteries

2020 ◽  
Vol 20 (3) ◽  
pp. 1962-1967
Author(s):  
Zhen Liu ◽  
Wei Zhou ◽  
Guilin Zeng ◽  
Yuling Zhang ◽  
Zebin Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cathode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Potential Range ◽  
X Ray Diffraction ◽  
Immersion Method ◽  
X Ray ◽  
Transmission Electron

Oroxylum as a traditional Chinese medicine, was used as a green and novel bio-template to synthesize tremella-like Li3V2(PO4)3/C composite (LVPC) cathode materials by adopting a facile immersion method. The microstructures were analyzed by X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy. The electrochemical properties were investigated by galvanostatic charge–discharge experiments. The LVPC revealed specific capacity of 95 mAh·g-1 at 1 C rate within potential range of 3.0–4.3 V. After 100 cycles at 0.2 C, the retention of discharge capacity was 96%. The modified electrochemical performance is mainly resulted from the distinct tremella-like structure.

Lithium-Ion Battery Anode Electrochemical Properties of Si/C Composites Using Graphite and Glucose as Carbon Source

2011 ◽  
Vol 347-353 ◽  
pp. 3506-3509
Author(s):  
Xu Ma ◽  
Yu Ling Liu ◽  
Ling Long Kong ◽  
Yan Hong Ding ◽  
Jie Zhao ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Carbon Source ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Charge Capacity ◽  
X Ray ◽  
Battery Anode ◽  
Charge Discharge ◽  
Scanning Electron ◽  
Discharge Test

Si/C composites were synthesized by using graphite and glucose as carbon source. The samples were characterized by X-ray diffractometer (XRD) and field emission scanning electron microscope(SEM). The electrochemical charge/discharge test was used to evaluate capacity and cycling stability of the composites. The first discharge and charge capacity of SGC composite using graphite and glucose as carbon source were 1661mAh/g and 1259.1 mAh/g, and the first coulombic efficiency was 75.8%. After 20 cycles, the capacity of SGC composite was 380 mAh/g and the coulombic efficiency remained over 98%.

Synthesis of MoO3/V2O5/C Composite as Novel Anode for Li-Ion Battery Application

2020 ◽  
Vol 20 (5) ◽  
pp. 2911-2916
Author(s):  
Zhen Zhang ◽  
Xiao Chen ◽  
Guangxue Zhang ◽  
Chuanqi Feng
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Li Ion Battery ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Li Ion ◽  
Battery Application

The MoO3/V2O5/C, MoO3/C and V2O5/C are synthesized by electrospinning combined with heat treatment. These samples are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and thermogravimetric analysis (TG) techniques. The results show that sample MoO3/V2O5/C is a composite composed from MoO3, V2O5 and carbon. It takes on morphology of the nanofibers with the diameter of 200~500 nm. The TG analysis result showed that the carbon content in the composite is about 40.63%. Electrochemical properties for these samples are studied. When current density is 0.2 A g−1, the MoO3/V2O5/C could retain the specific capacity of 737.6 mAh g−1 after 200 cycles and its coulomb efficiency is 92.99%, which proves that MoO3/V2O5/C has better electrochemical performance than that of MoO3/C and V2O5/C. The EIS and linear Warburg coefficient analysis results show that the MoO3/V2O5/C has larger Li+ diffusion coefficient and superior conductivity than those of MoO3/C or V2O5/C. So MoO3/V2O5/C is a promising anode material for lithium ion battery application.

A POROUS VANADIUM PENTOXIDE MATERIAL AND ITS ELECTROCHEMICAL PROPERTIES IN AQUEOUS ELECTROLYTE

2011 ◽  
Vol 04 (01) ◽  
pp. 61-64 ◽  
Author(s):  
ZHAOHUI LI ◽  
JIAOJUN TANG ◽  
JIE YANG ◽  
CHENG CHENG ◽  
QIZHEN XIAO ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Vanadium Pentoxide ◽  
Aqueous Electrolyte ◽  
Sol Gel ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Morphology ◽  
Cycling Performances ◽  
Scanning Electron

A porous vanadium pentoxide ( V2O5 ) material was prepared through a facile sol-gel route using β-cyclodextrin (β-CD) as template reagent. Its crystal structure and morphology were characterized by X-ray diffraction and scanning electron microscopy, respectively. The electrochemical properties of the as-prepared V2O5 in 1.0 mol l-1 Li2SO4 aqueous electrolyte were investigated by galvanostatic charging/discharging and cyclic voltammetry. The results revealed that the porous V2O5 could deliver the average capacities of 67, 54 and 42 mAh g-1 at the rates of 0.1, 0.5 and 2 C, respectively. The cycling performances of the V2O5/LiMn2O4 cells suggested that the porous V2O5 material could be used as an anode material for aqueous rechargeable lithium-ion batteries.

scholarly journals Hydrothermal Synthesis of Ni/Al Layered Double Hydroxide Nanorods

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Yun Zhao ◽  
Fenfei Xiao ◽  
Qingze Jiao
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Layered Double Hydroxide ◽  
Hydrothermal Reaction ◽  
Ph Value ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Double Hydroxide ◽  
Scanning Electron

Ni/Al layered double hydroxide (LDH) nanorods were successfully synthesized by the hydrothermal reaction. The crystal structure of the products was characterized by X-ray diffraction (XRD). The morphology of the products was observed using transmission electron microscopy (TEM) and field emission scanning electron microscopy (SEM). The influences of reaction time and pH value on the morphology of the Ni/Al LDHs were investigated. The result showed that the well-crystallized nanorods of Ni/Al LDHs could be obtained when the pH value was about 10.0 with a long reaction time (12–18 h) at 180°C.

Mangnese Dioxide Nano-Crystal as Catalyst to Remove Formaldehyde

2011 ◽  
Vol 298 ◽  
pp. 147-152 ◽  
Author(s):  
Wei Shao ◽  
Xiu Juan Chu ◽  
Kai Gao ◽  
Hua Zhang
Keyword(s):  
Hot Spot ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Formaldehyde Oxidation ◽  
Nano Crystal ◽  
Liquid Precipitation ◽  
Scanning Electron ◽  
Better Than

The purification technology and material of indoor formaldehyde is a hot spot in the field of material at present. In this paper, MnSO4, KMnO4, NaOH and H2O2 etc. are used to make manganese dioxide nanocrystal with the method of liquid precipitation. X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM) were used to characterize the structure and properties. The results show that the products are nano-crystals of γ- MnO2 and δ-MnO2. The catalyze oxidation of formaldehyde using bothγ- MnO2 and δ-MnO2 as catalysts was investigated; and acetyl acetone method was used to characterize formaldehyde chroma. The catalytic ability ofγ-MnO2 nanocrystal to catalyze formaldehyde oxidation is better than that ofδ-MnO2.

scholarly journals Hydrothermal Synthesis of Bi2MoO6 Visible-Light-Driven Photocatalyst

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Anukorn Phuruangrat ◽  
Sunisa Putdum ◽  
Phattranit Dumrongrojthanath ◽  
Somchai Thongtem ◽  
Titipun Thongtem
Keyword(s):  
Visible Light ◽  
Hydrothermal Reaction ◽  
Sodium Molybdate ◽  
Photocatalytic Efficiency ◽  
X Ray Diffraction ◽  
Bismuth Molybdate ◽  
Bending Vibrations ◽  
X Ray ◽  
Visible Light Driven ◽  
Scanning Electron

Bismuth molybdate (Bi2MoO6) nanoplates were synthesized by the hydrothermal reaction of bismuth nitrate and sodium molybdate as starting materials at 120–180°C for 5–20 h. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and scanning electron microscopy (SEM) were used to investigate the effect of reaction temperature and length of reaction time on phase and morphologies of the as-synthesized Bi2MoO6 samples. In this research, orthorhombic well-crystallized Bi2MoO6 nanoplates with the presence of stretching and bending vibrations of MoO6 and BiO6 octahedrons were detected, and the Bi2MoO6 nanoplates synthesized at 180°C for 5 h exhibit the highest photocatalytic efficiency over 96% within 100 min visible-light irradiation.

Solvothermal Synthesis of CuInS2 Porous Microspheres

2010 ◽  
Vol 663-665 ◽  
pp. 1150-1153
Author(s):  
Han Mei Hu ◽  
Chong Hai Deng
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Solvothermal Synthesis ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Porous Microspheres ◽  
Structure And Morphology ◽  
Transmission Electron ◽  
Scanning Electron

The porous hierarchical spherical CuInS2 microsturctures have been successfully fabricated through one-pot solvothermal technique. The crystal structure and morphology of the as-synthesized products are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results reveal that the shells of CuInS2 microspheres are composed of nanosheets or nanoparticles. The possible formation mechanism of CuInS2 porous microspheres is simply discussed.

The Preparation And Electrochemical Performance Analysis of Different Porous Silicon Composites

2021 ◽  
Author(s):  
Xuchun Wang ◽  
Qianrui Liu ◽  
Jiaohong Shu ◽  
Dongdong Ouyang ◽  
Xuemei Zhang ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Anode Materials ◽  
Electrochemical Techniques ◽  
Specific Capacity ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Porous Silicon Substrate ◽  
Interfacial Impedance ◽  
Scanning Electron

Abstract In this work, LiAlH4 is used to reduce SiO2 to porous silicon, and then nano-silver (AgNPs) and Li2CO3 are attached to porous silicon substrate to form different porous silicon composites. X-ray diffraction (XRD) and scanning electron microscopy (SEM) are applied to characterize the morphology of porous silicon composites, and porous silicon composites are tested via electrochemical techniques. The experimental results present that porous silicon composites loaded with AgNPs (Si-Ag) show higher specific capacity (476.0195 mA·h·g-1) and lower interfacial impedance compared with composites loaded with Li2CO3 (Si-Li2CO3). Si-Ag composites are suitable to be used as anode materials for lithium-ion batteries.

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