scholarly journals Microwave-Assisted Synthesis of Ge/GeO2-Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Capacity for Lithium-Ion Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 319
Author(s):  
Ji-Hye Koo ◽  
Seung-Min Paek
Keyword(s):  
Discharge Capacity ◽  
Graphene Nanosheets ◽  
Lithium Ion ◽  
Microwave Assisted Synthesis ◽  
Graphene Composite ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Significant Research ◽  
Long Term Performance ◽  
Term Performance

Germanium/germanium oxide nanoparticles with theoretically high discharge capacities of 1624 and 2152 mAh/g have attracted significant research interest for their potential application as anode materials in Li-ion batteries. However, these materials exhibit poor long-term performance due to the large volume change of 370% during charge/discharge cycles. In the present study, to overcome this shortcoming, a Ge/GeO2/graphene composite material was synthesized. Ge/GeO2 nanoparticles were trapped between matrices of graphene nanosheets to offset the volume expansion effect. Transmission electron microscopy images revealed that the Ge/GeO2 nanoparticles were distributed on the graphene nanosheets. Discharge/charge experiments were performed to evaluate the Li storage properties of the samples. The discharge capacity of the bare Ge/GeO2 nanoparticles in the first discharge cycle was considerably large; however, the value decreased rapidly with successive cycles. Conversely, the present Ge/GeO2/graphene composite exhibited superior cycling stability.

scholarly journals Multishelled NiO Hollow Spheres Decorated by Graphene Nanosheets as Anodes for Lithium-Ion Batteries with Improved Reversible Capacity and Cycling Stability

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Lihua Chu ◽  
Meicheng Li ◽  
Yu Wang ◽  
Xiaodan Li ◽  
Zipei Wan ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Graphene Nanosheets ◽  
Hollow Spheres ◽  
Modern Science ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Graphene Sheets ◽  
Reduced Graphene ◽  
Graphene Nanocomposite ◽  
A Current

Graphene-based nanocomposites attract many attentions because of holding promise for many applications. In this work, multishelled NiO hollow spheres decorated by graphene nanosheets nanocomposite are successfully fabricated. The multishelled NiO microspheres are uniformly distributed on the surface of graphene, which is helpful for preventing aggregation of as-reduced graphene sheets. Furthermore, the NiO/graphene nanocomposite shows much higher electrochemical performance with a reversible capacity of 261.5 mAh g−1at a current density of 200 mA g−1after 100 cycles tripled compared with that of pristine multishelled NiO hollow spheres, implying the potential application in modern science and technology.

Preparation and Properties of TiO2(B)/Graphene Nanocomposites as Anode Materials Fo Lithium-Ion Batteries

2014 ◽  
Vol 875-877 ◽  
pp. 183-186 ◽  
Author(s):  
Yi Ping Tang ◽  
Shi Ming Wang ◽  
Jia Feng Ding ◽  
Guang Ya Hou ◽  
Guo Qu Zheng
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Anode Materials ◽  
Graphene Nanosheets ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Graphene Nanocomposites ◽  
Transmission Electron ◽  
Uniform Diameter

In this work, TiO2(B) nanotubes with uniform diameter were prepared by the simple route of hydrothermal synthesis, and graphene nanosheets were added to form TiO2(B)/graphene nanocomposites, the two kinds of materials were comparatively studied as anode materials. The morphology and crystal structure were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The electrochemical performance was evaluated by galvanostatic chargedischarge tests. The results show that the nanocomposite electrode material has good electrochemical performance due to the contributions of graphene. At the current density of 50mA/g, the capacity of TiO2(B)/graphene is 135.8 mAh/g, and the coulombic efficiency is 61.8%, after 10 charge-discharge cycles it still retains 113.2mAh/g . However, TiO2(B) anode reduces rapidly to 65.6 mAh/g.

Single Crystalline V2O5 Nanowire/Graphene Composite as Cathode Material for Lithium-Ion Batteries

2013 ◽  
Vol 873 ◽  
pp. 575-580 ◽  
Author(s):  
Qing He ◽  
Dong Lin Zhao ◽  
Yang Yang Zhu ◽  
Jing Xing Zhang
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Graphene Nanosheets ◽  
Synthesis Method ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycle Performance ◽  
Single Crystalline ◽  
Electrochemical Testing ◽  
Transmission Electron

The single crystalline V2O5nanowire/graphene nanosheets (GNS) composite has been successfully prepared via an easy and facile one-step hydrothermal synthesis method. The morphology, structure and electrochemical performance of V2O5nanowire/GNS composite as cathode material for lithium-ion batteries were systematically investigated by transmission electron microscope, X-ray diffraction and a variety of electrochemical testing techniques. The V2O5single crystalline nanowires were supported on the GNS substrate and exhibited excellent electrochemical properties. When used as a cathode material of lithium-ion batteries, the composite material revealed high initial discharge capacities and exceptional rate capacities. It was found that V2O5nanowire/GNS composite exhibited a relatively high reversible capacity of 357 mA h g-1and fine cycle performance.

Mn doped FeCO3/reduced graphene composite as anode material for high performance lithium-ion batteries

2018 ◽  
Vol 428 ◽  
pp. 73-81 ◽  
Author(s):  
Congcong Zhang ◽  
Xin Cai ◽  
Donghui Xu ◽  
Wenyan Chen ◽  
Yueping Fang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
High Performance ◽  
Lithium Ion ◽  
Graphene Composite ◽  
Reduced Graphene ◽  
Mn Doped

Facile preparation of a V2O3/carbon fiber composite and its application for long-term performance lithium-ion batteries

2017 ◽  
Vol 41 (13) ◽  
pp. 5380-5386 ◽  
Author(s):  
Xinping Liu ◽  
Renpin Liu ◽  
Lingxing Zeng ◽  
Xiaoxia Huang ◽  
Xi Chen ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Nanofiber ◽  
Fiber Composite ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Carbon Fiber Composite ◽  
Long Term Performance ◽  
Term Performance

A V2O3/carbon-nanofiber composite was initially synthesized, which exhibited large reversible capacity and excellent long-term cycling performance for lithium-ion batteries.

Hierarchical Ti3C2@TiO2 MXene hybrids with tunable interlayer distance for highly durable lithium-ion batteries

Nanoscale ◽  
2020 ◽  
Vol 12 (18) ◽  
pp. 10369-10379 ◽  
Author(s):  
Li Li ◽  
Gaoxue Jiang ◽  
Cuihua An ◽  
Zhengjun Xie ◽  
Yijing Wang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Hybrid Material ◽  
Active Sites ◽  
Lithium Ion ◽  
Rechargeable Batteries ◽  
High Rate ◽  
Interlayer Distance ◽  
Long Term Performance ◽  
Term Performance

To realize high-rate and long-term performance of rechargeable batteries, the most effective approach is to develop an advanced hybrid material with a stable structure and more reaction active sites.

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