scholarly journals Facile Synthesis of Core-Shell Structured SiO2@Carbon Composite Nanorods for High-Performance Lithium-Ion Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 513 ◽  
Author(s):  
Haibo Pang ◽  
Weicai Zhang ◽  
Peifeng Yu ◽  
Ning Pan ◽  
Hang Hu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Electric Conductivity ◽  
Current Density ◽  
Volume Expansion ◽  
Lithium Ion ◽  
Carbon Composite ◽  
Core Shell ◽  
Electrochemical Performances ◽  
Composite Nanorods

Recently, SiO2 has attracted wide attention in lithium-ion batteries owing to its high theoretical capacity and low cost. However, the utilization of SiO2 is impeded by the enormous volume expansion and low electric conductivity. Although constructing SiO2/carbon composite can significantly enhance the electrochemical performance, the skillful preparation of the well-defined SiO2/carbon composite is still a remaining challenge. Here, a facile strategy of in situ coating of polydopamine is applied to synthesis of a series of core-shell structured SiO2@carbon composite nanorods with different thicknesses of carbon shells. The carbon shell uniformly coated on the surface of SiO2 nanorods significantly suppresses the volume expansion to some extent, as well as improves the electric conductivity of SiO2. Therefore, the composite nanorods exhibit a remarkable electrochemical performance as the electrode materials of lithium-ion batteries. For instance, a high and stable reversible capacity at a current density of 100 mA g−1 reaches 690 mAh g−1 and a capacity of 344.9 mAh g−1 can be achieved even at the high current density of 1000 mA g−1. In addition, excellent capacity retention reaches 95% over 100 cycles. These SiO2@carbon composite nanorods with decent electrochemical performances hold great potential for applications in lithium-ion batteries.

One-Step Synthesis and High Electrochemical Performance of Porous Fe3O4/Carbon Nanocomposites as Anodes for Lithium-Ion Batteries

NANO ◽  
2019 ◽  
Vol 14 (07) ◽  
pp. 1950082 ◽  
Author(s):  
Jianglin Xu ◽  
Yaping Zhu ◽  
Yan Sun ◽  
Anjian Xie
Keyword(s):  
Electrochemical Performance ◽  
Porous Structure ◽  
Lithium Ion Batteries ◽  
Current Density ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Raw Material ◽  
Electrochemical Performances ◽  
Lithium Storage ◽  
One Step

In this report, the porous Fe3O4/C nanocomposites were successfully synthesized by using ferrocene as raw material and dilute nitric acid as solvent via extremely convenient and low-cost one-step calcining method. The formation of porous structure resulted from the aggregation and assembly of numerous nanoparticles. The experimental results show that the crystallinities, morphologies and electrochemical performance of samples were affected by the calcining temperature and carbon content. As an anode for lithium-ion batteries (LIBs), the Fe3O4/C nanocomposites obtained at calcination temperature of 500∘C (Fe3O4/C-a500) exhibited remarkable initial specific discharge capacity of 1418[Formula: see text]mA[Formula: see text]h g[Formula: see text] and a reversible capacity retention of 721[Formula: see text]mA[Formula: see text]h[Formula: see text]g[Formula: see text] after 100 cycles at the current density of 100[Formula: see text]mA[Formula: see text]g[Formula: see text]. The excellent properties can be attributed to the high theoretical capacity of Fe3O4, the high conductivity of carbon and especially the porous structure, which offered more sites for the storage and insertion of Li ions. Even at the current density of 1000[Formula: see text]mA[Formula: see text]h[Formula: see text]g[Formula: see text], the reversible capacity of Fe3O4/C-a500 can be up to 291[Formula: see text]mA[Formula: see text]h[Formula: see text]g[Formula: see text], indicating the prepared typical nanocomposite presented excellent electrochemical performances and lithium storage capacity, which may be a promising candidate as the anode material for LIBs.

Research Progress and Application of Modified Silicon-Based Anode Materials for Lithium-Ion Batteries

2021 ◽  
Vol 1036 ◽  
pp. 35-44
Author(s):  
Ling Fang Ruan ◽  
Jia Wei Wang ◽  
Shao Ming Ying
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Volume Expansion ◽  
Anode Materials ◽  
Active Material ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Research Progress ◽  
Ion Intercalation ◽  
Silicon Based

Silicon-based anode materials have been widely discussed by researchers because of its high theoretical capacity, abundant resources and low working voltage platform,which has been considered to be the most promising anode materials for lithium-ion batteries. However,there are some problems existing in the silicon-based anode materials greatly limit its wide application: during the process of charge/discharge, the materials are prone to about 300% volume expansion, which will resultin huge stress-strain and crushing or collapse on the anods; in the process of lithium removal, there is some reaction between active material and current collector, which creat an increase in the thickness of the solid phase electrolytic layer(SEI film); during charging and discharging, with the increase of cycle times, cracks will appear on the surface of silicon-based anode materials, which will cause the batteries life to decline. In order to solve these problems, firstly, we summarize the design of porous structure of nanometer sized silicon-based materials and focus on the construction of three-dimensional structural silicon-based materials, which using natural biomass, nanoporous carbon and metal organic framework as structural template. The three-dimensional structure not only increases the channel of lithium-ion intercalation and the rate of ion intercalation, but also makes the structure more stable than one-dimensional or two-dimensional. Secondly, the Si/C composite, SiOx composite and alloying treatment can improve the volume expansion effection, increase the rate of lithium-ion deblocking and optimize the electrochemical performance of the material. The composite materials are usually coated with elastic conductive materials on the surface to reduce the stress, increase the conductivity and improve the electrochemical performance. Finally, the future research direction of silicon-based anode materials is prospected.

A metal–organic-framework approach to engineer hollow bimetal oxide microspheres towards enhanced electrochemical performances of lithium storage

2019 ◽  
Vol 48 (6) ◽  
pp. 2019-2027 ◽  
Author(s):  
Weiwei Sun ◽  
Si Chen ◽  
Yong Wang
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Metal Organic Framework ◽  
Hollow Microsphere ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Lithium Storage ◽  
Excellent Electrochemical Performance ◽  
Framework Approach ◽  
Metal Organic

A MOF-derived approach is used to fabricate a Fe–Mn–O/C hollow microsphere anode, which delivers excellent electrochemical performance for lithium-ion batteries.

scholarly journals Centrifugally Spun α-Fe2O3/TiO2/Carbon Composite Fibers as Anode Materials for Lithium-Ion Batteries

2019 ◽  
Vol 9 (19) ◽  
pp. 4032 ◽  
Author(s):  
Luis Zuniga ◽  
Gabriel Gonzalez ◽  
Roberto Orrostieta Chavez ◽  
Jason C. Myers ◽  
Timothy P. Lodge ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Fiber ◽  
Carbon Composite ◽  
Composite Fibers ◽  
X Ray ◽  
Binder Free

We report results on the electrochemical performance of flexible and binder-free α-Fe2O3/TiO2/carbon composite fiber anodes for lithium-ion batteries (LIBs). The composite fibers were produced via centrifugal spinning and subsequent thermal processing. The fibers were prepared from a precursor solution containing PVP/iron (III) acetylacetonate/titanium (IV) butoxide/ethanol/acetic acid followed by oxidation at 200 °C in air and then carbonization at 550 °C under flowing argon. The morphology and structure of the composite fibers were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). These ternary composite fiber anodes showed an improved electrochemical performance compared to the pristine TiO2/C and α-Fe2O3/C composite fiber electrodes. The α-Fe2O3/TiO2/C composite fibers also showed a superior cycling performance with a specific capacity of 340 mAh g−1 after 100 cycles at a current density of 100 mA g−1, compared to 61 mAh g−1 and 121 mAh g−1 for TiO2/C and α-Fe2O3/C composite electrodes, respectively. The improved electrochemical performance and the simple processing of these metal oxide/carbon composite fibers make them promising candidates for the next generation and cost-effective flexible binder-free anodes for LIBs.

Facile fabrication of SnO2@TiO2 core–shell structures as anode materials for lithium-ion batteries

2016 ◽  
Vol 4 (33) ◽  
pp. 12850-12857 ◽  
Author(s):  
Zheng Yi ◽  
Qigang Han ◽  
Ping Zan ◽  
Yong Cheng ◽  
Yaoming Wu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Anode Materials ◽  
Lithium Ion ◽  
Shell Structures ◽  
Core Shell ◽  
Electrochemical Performances ◽  
Facile Fabrication ◽  
Novel Strategy

A novel strategy to fabricate SnO2@TiO2 composite is developed. As an anode material, the obtained composite exhibits enhanced electrochemical performances.

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