scholarly journals Novel Synthesis of Holey Reduced Graphene Oxide/Polystyrene (HRGO/PS) Nanocomposites by Microwave Irradiation as Anodes for High-Temperature Lithium-Ion Batteries

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2248 ◽  
Author(s):  
Yazeed Aldawsari ◽  
Yasmin Mussa ◽  
Faheem Ahmed ◽  
Muhammad Arsalan ◽  
Edreese Alsharaeh
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
High Temperature ◽  
Microwave Irradiation ◽  
Reduced Graphene Oxide ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Reduced Graphene ◽  
Discharge Capacities ◽  
Charge Discharge

To overcome the risk of exothermic lithium-ion battery overheating reactions, we fabricated a novel, high-temperature-stable anode material composed of holey reduced graphene oxide/polystyrene (HRGO/PS) nanocomposites synthesized through in situ bulk polymerization in the presence of HRGO via microwave irradiation. The HRGO/PS nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, and electron microscopy analyses including field-emission scanning electron microscopy and transmission electron microscopy. All characterization studies demonstrated homogenous dispersion of HRGO in the PS matrix, which enhanced the thermal and electrical properties of the overall nanocomposites. These novel HRGO/PS nanocomposites exhibited excellent electrochemical responses, with reversible charge/discharge capacities of 92.1/92.78 mA·h/g at a current density of 500 mA/g with ~100% capacity retention and ~100% coulombic efficiency at room temperature. Furthermore, an examination of the electrochemical properties of these nanocomposites at 110 °C showed that HRGO/PS nanocomposites still displayed good charge/discharge capacities with stable cycle performances for 150 cycles.

Three-dimensional bi-conductive Si-based anode for high-performance lithium ion battery

2021 ◽  
Author(s):  
Yangqiang Jiang ◽  
Feng Xiang ◽  
Shijun Fan ◽  
Zixu Sun
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Lithium Ion Battery ◽  
Reduced Graphene Oxide ◽  
Anode Material ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Reduced Graphene

A high-coulombic-efficiency Si-based anode material with Si-Cu-C dispersed in a reduced graphene oxide (RGO) and carbon nanotube (CNT) framework (namely SCC/RGO/CNT) is designed and synthesized. The composite could show a...

Analysis of Deposition Methods for Lithium-Ion Battery Anodes Using Reduced Graphene Oxide Slurries on Copper Foil

2018 ◽  
Vol 140 (9) ◽  
Author(s):  
James Garofalo ◽  
John Lawler ◽  
Daniel Walczyk ◽  
Nikhil Koratkar
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Battery ◽  
Reduced Graphene Oxide ◽  
Copper Foil ◽  
Lithium Ion ◽  
High Volume ◽  
Discharge Rates ◽  
Reduced Graphene ◽  
Deposition Height ◽  
Charge Discharge

Graphene oxide (GO) slurries were deposited onto copper foil for use in lithium-ion battery anodes to determine the best deposition method(s) for research or high-volume manufacturing. Four deposition methods were tested: doctor blade, Mayer rod, slot die, and low volume low pressure (LVLP) spray. Analytical models that link tooling and process characteristics to mass flow rate of slurry and the resulting dry deposition height are developed and validated experimentally. While all methods successfully produced functioning batteries, a number of different qualitative and quantitative metrics from experimental results identified the best method for both situations. Observations were recorded on adhesion, deposition consistency, usability, and cleanability. Data on specific discharge capacity were recorded to show performance over the anode lifetime and at different charge/discharge rates. The data indicate that anodes produced using reduced graphene oxide (rGO) deliver a specific charge storage capacity of 50 to 400 mAh/g at charge–discharge rates of 1 C to 0.05 C. Doctor blading proved to be best for laboratory setups because of its adjustability, while the Mayer rod shows promise for high-volume manufacturing due to better performance and the use of nonadjustable, dedicated tooling. All methods, analysis, and metrics are discussed.

Preparation and Characterization of Rice Husks-Derived Silicon-Tin/Nitrogen-Doped Reduced Graphene Oxide Nanocomposites as Anode Materials for Lithium-Ion Batteries

2018 ◽  
Vol 283 ◽  
pp. 46-54 ◽  
Author(s):  
Viratchara Laokawee ◽  
Nutpaphat Jarulertwathana ◽  
Thanapat Autthawong ◽  
Takuya Masuda ◽  
Yothin Chimupala ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Anode Materials ◽  
Lithium Ion ◽  
Discharge Process ◽  
X Rays ◽  
Nitrogen Doped ◽  
Reduced Graphene

Silicon (Si) and Tin (Sn) are promising materials for anodes in lithium-ion batteries due to their high theoretical capacity and abundance of Si on earth. Si can be derived from rice husk which is the main agricultural byproduct in Thailand. However, the challenge of using these materials in lithium-ion batteries is the large volume expansion during charge-discharge process which leads to pulverization of electrodes. The effective solution is to combine these metals as composite with carbon supporter. Nitrogen-doped reduced graphene oxide (NrGO) has been used as carbon supporter in this research because of its high surface area, electrical conductivity and rate of electron transfer. To confirm phases of products, X-rays diffraction techniques (XRD) was measured. The results show that there were peaks of Si, Sn and carbon in XRD patterns. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to illustrate the morphology of prepared composites. From SEM and TEM results, there were small-sized particles of Si and Sn dispersed randomly on NrGO sheets. Furthermore, electrochemical properties of these products were measured to confirm their efficiency as anode materials in lithium-ion batteries by coin cell assembly. The prepared composite can deliver the highest initial capacity of 1600 mA h g-1 and expected to use as anode materials in the next generation lithium-ion batteries.

A self-assembly strategy for fabricating highly stable silicon/reduced graphene oxide anodes for lithium-ion batteries

2016 ◽  
Vol 40 (10) ◽  
pp. 8961-8968 ◽  
Author(s):  
Xiao Li ◽  
Xiaodong Tian ◽  
Ning Zhao ◽  
Kai Wang ◽  
Yan Song ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Cyclic Stability ◽  
Assembly Strategy ◽  
Reduced Graphene ◽  
Initial Coulombic Efficiency

High initial coulombic efficiency and improved cyclic stability were obtained by introducting CATB into GO and Si NPs.

Designing hollowed carbon@Si cubic nanobox@reduced graphene oxide nanostructures for lithium-ion battery with high capacity and long cyclic stability

2020 ◽  
Vol 13 (08) ◽  
pp. 2050042
Author(s):  
Zehao Zhang ◽  
Haibo Li
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Specific Capacity ◽  
High Capacity ◽  
Lithium Ion ◽  
Electrochemical Analysis ◽  
Discharge Performance ◽  
Continuous Formation ◽  
Reduced Graphene ◽  
Charge Discharge

In this work, we synthesized the hollowed carbon@Si cubic nanobox sandwiched by reduced graphene oxide (HC@Si@rGO) using the template-sacrificial method for lithium-ions batteries’ (LIBs’) anode with high specific capacity and ultra-stable long cyclic performance. During the preparation, the ZIF-8 was initially etched by Si(OH)4 to generate the hollowed ZIF-8 and instantaneously in-situ formation of SiO2 coatings on ZIF-8, resulting in synthesis of ZIF-8@SiO2. Afterwards, the ZIF-8@SiO2 was reduced to HC@Si by the magnesium thermal treatment while the NaCl was employed as a heat-removing agent. Successfully, the rGO was introduced coupling with HC@Si to obtain HC@Si@rGO. As anode for LIBs, it delivers high initial discharge capacity of 3712.9 mAh g[Formula: see text] at the current density of 0.1 A g[Formula: see text]. After 130 cycles, a stable specific capacity of 1311.0 mAh g[Formula: see text] is achieved. The long charge/discharge performance of HC@Si@rGO anode is demonstrated at 0.5 A g[Formula: see text], exhibiting the specific capacity of 595.4 mAh g[Formula: see text] after 500 cycles. Based on the electrochemical analysis, these remarkable performances are attributed to the unique nanostructure of HC@Si@rGO. Essentially, the inner-layered HC acts as a buffer matrix to reinforce the mechanical strength of the entire electrode and restrain the volume change of Si during the charge/discharge. On the other hand, the evenly distributed HC@Si is fixed within the flexible rGO sheets to form the network structure, which not only promises a good conductive connection between HC@Si but also prevents the continuous formation of solid electrolyte interface film.

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