scholarly journals Facile Synthesis Sandwich-Structured Ge/NrGO Nanocomposite as Anodes for High-Performance Lithium-Ion Batteries

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1582
Author(s):  
Thanapat Autthawong ◽  
Theeraporn Promanan ◽  
Bralee Chayasombat ◽  
Ai-Shui Yu ◽  
Kohei Uosaki ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Internal Resistance ◽  
Reduced Graphene ◽  
Sandwiched Structure ◽  
The Individual ◽  
Storage Technologies ◽  
20 Nm

This work aimed to design a facile preparation of sandwich-liked Ge nanoparticles/nitrogen-doped reduced graphene oxide (Ge/NrGO) nanocomposites used as anode in lithium-ion batteries through the chemical solution route. The advanced electron microscopy, STEM-HAADF and STEM-EDS mapping, evidenced that the individual Ge particles with sizes ranging from 5 to 20 nm were distributed and wrapped as sandwiches within the multi-layered NrGO sheets, which were mainly composed of the pyridinic-N form (4.8%wt.). The battery performances of the 20Ge/NrGO nanocomposite anode exhibit a high reversible capacity (700 mAh g−1) and retained its outstanding stability during long-term cycling. The internal resistance (28.0 Ω) was also decreased after cycling, according to EIS measurement. The sandwiched structure of Ge-based nanocomposite with the interconnected NrGO layers discussed in this article possessed the high-performance LIBs with great potential application in energy storage technologies.

Reduced Graphene Oxide Decorated with Fe3O4 Nanoparticles as High Performance Anode for Lithium Ion Batteries

2012 ◽  
Vol 519 ◽  
pp. 108-112 ◽  
Author(s):  
Huai Liang Xu ◽  
Yang Shen ◽  
Hong Bi
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Fe3o4 Nanoparticles ◽  
High Performance ◽  
Specific Capacity ◽  
Lithium Ion ◽  
A Value ◽  
Reduced Graphene ◽  
20 Nm

A composite of reduced graphene oxide (r-GO) decorated densely with 20 nm Fe3O4 nanoparticles has been prepared by a facile solvothermal method. The Fe3O4/r-GO composites are used as the anode material for lithium ion batteries, which show an extremely high initial discharge specific capacity of 1702 mAh/g. Compared with the pure Fe3O4 nanoparticles, the composite anode exhibits a higher capacity retention capability since its specific capacity fades very slowly and retains a value of 711 mAh/g after 30 cycles. The r-GO sheets worked as an ultra-thin and conductive substrate can not only prevent the detachment and agglomeration of Fe3O4 nanoparticles, but also compensate for the volume change of Fe3O4 nanoparticles during the charge-discharge cycles, and thus extend the cycling life of the Fe3O4/r-GO composites electrode.

Synthesis and Electrochemical Performance of SnO2/Graphene Hybrid Anode for Lithium Ion Batteries

2013 ◽  
Vol 1540 ◽  
Author(s):  
Chia-Yi Lin ◽  
Chien-Te Hsieh ◽  
Ruey-Shin Juang
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Homogeneous Distribution

ABSTRACTAn efficient microwave-assisted polyol (MP) approach is report to prepare SnO2/graphene hybrid as an anode material for lithium ion batteries. The key factor to this MP method is to start with uniform graphene oxide (GO) suspension, in which a large amount of surface oxygenate groups ensures homogeneous distribution of the SnO2 nanoparticles onto the GO sheets under the microwave irradiation. The period for the microwave heating only takes 10 min. The obtained SnO2/graphene hybrid anode possesses a reversible capacity of 967 mAh g-1 at 0.1 C and a high Coulombic efficiency of 80.5% at the first cycle. The cycling performance and the rate capability of the hybrid anode are enhanced in comparison with that of the bare graphene anode. This improvement of electrochemical performance can be attributed to the formation of a 3-dimensional framework. Accordingly, this study provides an economical MP route for the fabrication of SnO2/graphene hybrid as an anode material for high-performance Li-ion batteries.

Sign in / Sign up

Export Citation Format

Share Document