SURFACE DECORATION OF COMMERCIAL GRAPHITE MICROSPHERES WITH SMALL Si/C MICROSPHERES AS IMPROVED ANODE MATERIALS FOR Li-ION BATTERIES

2013 ◽  
Vol 01 (04) ◽  
pp. 1340017
Author(s):  
ZAILEI ZHANG ◽  
YANHONG WANG ◽  
MEIJU ZHANG ◽  
QIANGQIANG TAN ◽  
FABING SU
Keyword(s):  
Electron Microscopy ◽  
Composite Materials ◽  
Electrochemical Performance ◽  
Photoelectron Spectroscopy ◽  
Anode Materials ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
X Ray ◽  
Li Ion

We report a facile chemical vapor deposition (CVD) method to grow silicon/carbon ( Si / C ) microspheres on commercial graphite microsphere (GMs) surface to prepare Si / C / GMs composite anode materials for Li -ion batteries. The CVD synthesis is conducted at 900°C using methyltrichlorosilane ( CH 3 SiCl 3) as both the Si and C precursor, which is a cheap byproduct in organosilane industry. The samples are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, thermogravimetric analysis, Raman spectroscopy and X-ray photoelectron spectroscopy. It is found that the obtained Si / C / GMs composites are composed of Si nanocrystals, amorphous carbon and GMs. The CVD time significantly influences the morphology and electrochemical performance of the Si / C / GMs composite materials. The Si / C / GMs composite materials prepared at CVD condition of 900°C for 4 h possess improved electrochemical properties, showing a discharge capacity of 821.4 mAh g−1 at a rate of 50 mA g−1, and a good cycling performance (i.e., a reversible capacity of 565.2 mAh g−1 is retained after 50 cycles). The enhanced electrochemical performance is attributed to the formation of Si / C microsphere network among GMs, which increases the electronic conductivity and is able to buffer the large volume changes of Si during lithium ion insertion/extraction.

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.

Li(Al1–zZnz) alloys as anode materials for rechargeable Li-ion batteries

2010 ◽  
Vol 25 (8) ◽  
pp. 1492-1499 ◽  
Author(s):  
I. Chumak ◽  
G. Dmytriv ◽  
V. Pavlyuk ◽  
S. Oswald ◽  
J. Eckert ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Anode Materials ◽  
Continuous Solid Solution ◽  
Structure Evolution ◽  
Underlying Structure ◽  
Li Ion Batteries ◽  
X Ray Diffraction ◽  
X Ray ◽  
Li Ion ◽  
Ongoing Formation

The cycling behavior of anode materials based on alloys from the Li(Al1–zZnz) continuous solid solution has been studied. The performance of the most promising composition Li(Al0.8Zn0.2) was tested in half-cells against metallic Li with three different electrolytes and in full Li-ion cells against a V2O5 cathode. The underlying structure evolution during cycling and the most relevant fatigue mechanisms are elucidated by x-ray diffraction, nuclear magnetic resonance, and x-ray photoelectron spectroscopy, and reveal a loss of mobile Li due to the ongoing formation of solid electrolyte interfaces. An enhanced stability for Li(Al1–zZnz) electrodes with z˜0.2 results from a peculiar microstructure due to the decomposition of Al and Zn in the Li-poor state and their intermixing in the Li-rich state.

Improved electrochemical performance of 2D accordion-like MnV2O6 nanosheets as anode materials for Li-ion batteries

2020 ◽  
Vol 49 (6) ◽  
pp. 1794-1802 ◽  
Author(s):  
Xiaoyu Zhang ◽  
Xinjian Li ◽  
Fuyi Jiang ◽  
Wei Du ◽  
Chuanxin Hou ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Anode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Theoretical Specific Capacity ◽  
Constituent Elements

MnV2O6 is a promising anode material for lithium ion batteries with high theoretical specific capacity, abundant reserves and inexpensive constituent elements.

Self-recovery in Li-metal hybrid lithium-ion batteries via WO3 reduction

Nanoscale ◽  
2018 ◽  
Vol 10 (34) ◽  
pp. 15956-15966 ◽  
Author(s):  
Rajesh Pathak ◽  
Ashim Gurung ◽  
Hytham Elbohy ◽  
Ke Chen ◽  
Khan Mamun Reza ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Volume Expansion ◽  
Anode Materials ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
Transitional Metal ◽  
Transitional Metal Oxides ◽  
Li Ion

It has been a challenge to use transitional metal oxides as anode materials in Li-ion batteries due to their low electronic conductivity, poor rate capability and large volume expansion.

scholarly journals Binder Free SnO2-CNT Composite as Anode Material for Li-Ion Battery

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Dionne Hernandez ◽  
Frank Mendoza ◽  
Emmanuel Febus ◽  
Brad R. Weiner ◽  
Gerardo Morell
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Tin Dioxide ◽  
Composite Films ◽  
Volume Ratio ◽  
Lithium Ion ◽  
Chemical Vapor ◽  
Li Ion Battery ◽  
X Ray ◽  
Li Ion

Tin dioxide-carbon nanotube (SnO2-CNT) composite films were synthesized on copper substrates by a one-step process using hot filament chemical vapor deposition (HFCVD) with methane gas (CH4) as the carbon source. The composite structural properties enhance the surface-to-volume ratio of SnO2demonstrating a desirable electrochemical performance for a lithium-ion battery anode. The SnO2and CNT interactions were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared-attenuated total reflectance (ATR-FTIR) spectroscopy. Comprehensive analysis of the structural, chemical, and electrochemical properties reveals that the material consists of self-assembled and highly dispersed SnO2nanoparticles in CNT matrix. The process employed to develop this SnO2-CNT composite film presents a cost effective and facile way to develop anode materials for Li-ion battery technology.

scholarly journals Fabrication of Si3N4@Si@Cu Thin Films by RF Sputtering as High Energy Anode Material for Li-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2824
Author(s):  
Hocine Merabet ◽  
Yannis De Luna ◽  
Khadiga Mohamed ◽  
Nasr Bensalah
Keyword(s):  
Electron Microscopy ◽  
Silicon Nitride ◽  
Magnetron Sputtering ◽  
Electrochemical Performance ◽  
Anode Material ◽  
Photoelectron Spectroscopy ◽  
High Energy ◽  
X Ray ◽  
Practical Applications ◽  
Li Ion

Silicon and silicon nitride (Si3N4) are some of the most appealing candidates as anode materials for LIBs (Li-ion battery) due to their favorable characteristics: low cost, abundance of Si, and high theoretical capacity. However, these materials have their own set of challenges that need to be addressed for practical applications. A thin film consisting of silicon nitride-coated silicon on a copper current collector (Si3N4@Si@Cu) has been prepared in this work via RF magnetron sputtering (Radio Frequency magnetron sputtering). The anode material was characterized before and after cycling to assess the difference in appearance and composition using XRD (X-ray Powder Diffraction), XPS (X-ray Photoelectron Spectroscopy), SEM/EDX (Scanning Electron Microscopy/ Energy Dispersive X-Ray Analysis), and TEM (Transmission Electron Microscopy). The effect of the silicon nitride coating on the electrochemical performance of the anode material for LIBs was evaluated against Si@Cu film. It has been found that the Si3N4@Si@Cu anode achieved a higher capacity retention (90%) compared to Si@Cu (20%) after 50 cycles in a half-cell versus Li+/Li, indicating a significant improvement in electrochemical performance. In a full cell, the Si3N4@Si@Cu anode achieved excellent efficiency and acceptable specific capacities, which can be enhanced with further research.

scholarly journals Hierarchical CuBi2O4 microspheres as lithium-ion battery anodes with superior high-temperature electrochemical performance

RSC Advances ◽  
2017 ◽  
Vol 7 (22) ◽  
pp. 13250-13256 ◽  
Author(s):  
Hong Yin ◽  
Ming-Lei Cao ◽  
Xiang-Xiang Yu ◽  
Chong Li ◽  
Yan Shen ◽  
...  
Keyword(s):  
High Temperature ◽  
Electrochemical Performance ◽  
Lithium Ion Battery ◽  
Anode Materials ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
Multilevel Structure ◽  
Li Ion

Hierarchical CuBi2O4 microspheres as anode materials for Li-ion batteries show superior high-temperature electrochemical performance due to its multilevel structure and outstanding thermostability.

scholarly journals A Facile Synthesis of MoS2/g-C3N4 Composite as an Anode Material with Improved Lithium Storage Capacity

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1730 ◽  
Author(s):  
Ha Tran Huu ◽  
Xuan Dieu Nguyen Thi ◽  
Kim Nguyen Van ◽  
Sung Jin Kim ◽  
Vien Vo
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Photoelectron Spectroscopy ◽  
Gas Flow ◽  
Electrode Materials ◽  
High Capacity ◽  
Sodium Molybdate ◽  
Lithium Ion ◽  
Lithium Storage ◽  
X Ray

The demand for well-designed nanostructured composites with enhanced electrochemical performance for lithium-ion batteries electrode materials has been emerging. In order to improve the electrochemical performance of MoS2-based anode materials, MoS2 nanosheets integrated with g-C3N4 (MoS2/g-C3N4 composite) was synthesized by a facile heating treatment from the precursors of thiourea and sodium molybdate at 550 °C under N2 gas flow. The structure and composition of MoS2/g-C3N4 were confirmed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis and elemental analysis. The lithium storage capability of the MoS2/g-C3N4 composite was evaluated, indicating high capacity and stable cycling performance at 1 C (A·g−1) with a reversible capacity of 1204 mA·h·g−1 for 200 cycles. This result is believed the role of g-C3N4 as a supporting material to accommodate the volume change and improve charge transport for nanostructured MoS2. Additionally, the contribution of the pseudocapacitive effect was also calculated to further clarify the enhancement in Li-ion storage performance of the composite.

Effect of surface modification on electrochemical performance of nano-sized Si as an anode material for Li-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34715-34723 ◽  
Author(s):  
Chao Li ◽  
Tongfei Shi ◽  
Decheng Li ◽  
Hideyuki Yoshitake ◽  
Hongyu Wang
Keyword(s):  
Surface Modification ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Anode Materials ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Effect Of Surface

Silicon is one of the most promising anode materials for lithium-ion batteries.

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