scholarly journals Free-standing Reduced Graphene Oxide/Carbon Nanotube Paper for Flexible Sodium-ion Battery Applications

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 1014
Author(s):  
Yong Hao ◽  
Chunlei Wang
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Reduced Graphene Oxide ◽  
Active Sites ◽  
Electrode Materials ◽  
Spray Deposition ◽  
Sodium Ion ◽  
Free Standing ◽  
Electrostatic Spray Deposition ◽  
Reduced Graphene

We propose a flexible, binder-free and free-standing carbonaceous paper fabricated via electrostatic spray deposition using reduced graphene oxide/carbon nanotube (rGO/CNT) as a promising electrode material for flexible sodium-ion batteries (NIBs). The as-prepared rGO/CNT paper exhibits a three-dimensional (3D) layered structure by employing rGO as conductive frameworks to provide sodium-storage active sites and CNT as spacer to increase rGO interlayer distance and benefit the diffusion kinetics of sodium ions. Consequently, the rGO/CNT paper delivers an enhanced sodium ion storage capacity of 166.8 mAh g−1 at 50 mA g−1, retaining an average capacity of 101.4 mAh g−1 when current density sets back 100 mA g−1 after cycling at various current rates. An average capacity of 50 mAh g−1 at 200 mA g−1 was stabilized when cycling up to 300 cycles. The well-maintained electrochemical performance of free-standing rGO/CNT paper is due to the well-established hybrid 3D nanostructures, which demonstrates our carbon based material fabricated by a facile approach can be applied as one of the high-performance and low-cost electrode materials for applications in flexible energy storage devices.

scholarly journals Tin-Decorated Reduced Graphene Oxide and NaLi0.2Ni0.25Mn0.75O as Electrode Materials for Sodium-Ion Batteries

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1074 ◽  
Author(s):  
Pier Paolo Prosini ◽  
Maria Carewska ◽  
Cinzia Cento ◽  
Gabriele Tarquini ◽  
Fabio Maroni ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Organic Precursor ◽  
Functionalized Graphene Oxide ◽  
Sodium Metal ◽  
Reduced Graphene

A tin-decorated reduced graphene oxide, originally developed for lithium-ion batteries, has been investigated as an anode in sodium-ion batteries. The composite has been synthetized through microwave reduction of poly acrylic acid functionalized graphene oxide and a tin oxide organic precursor. The final product morphology reveals a composite in which Sn and SnO2 nanoparticles are homogenously distributed into the reduced graphene oxide matrix. The XRD confirms the initial simultaneous presence of Sn and SnO2 particles. SnRGO electrodes, prepared using Super-P carbon as conducting additive and Pattex PL50 as aqueous binder, were investigated in a sodium metal cell. The Sn-RGO showed a high irreversible first cycle capacity: only 52% of the first cycle discharge capacity was recovered in the following charge cycle. After three cycles, a stable SEI layer was developed and the cell began to work reversibly: the practical reversible capability of the material was 170 mA·h·g−1. Subsequently, a material of formula NaLi0.2Ni0.25Mn0.75O was synthesized by solid-state chemistry. It was found that the cathode showed a high degree of crystallization with hexagonal P2-structure, space group P63/mmc. The material was electrochemically characterized in sodium cell: the discharge-specific capacity increased with cycling, reaching at the end of the fifth cycle a capacity of 82 mA·h·g−1. After testing as a secondary cathode in a sodium metal cell, NaLi0.2Ni0.25Mn0.75O was coupled with SnRGO anode to form a sodium-ion cell. The electrochemical characterization allowed confirmation that the battery was able to reversibly cycle sodium ions. The cell’s power response was evaluated by discharging the SIB at different rates. At the lower discharge rate, the anode capacity approached the rated value (170 mA·h·g−1). By increasing the discharge current, the capacity decreased but the decline was not so pronounced: the anode discharged about 80% of the rated capacity at 1 C rate and more than 50% at 5 C rate.

Free-standing reduced graphene oxide/MnO2–reduced graphene oxide–carbon nanotube nanocomposite flexible membrane as an anode for improving lithium-ion batteries

2017 ◽  
Vol 19 (11) ◽  
pp. 7498-7505 ◽  
Author(s):  
Yong Li ◽  
Daixin Ye ◽  
Bin Shi ◽  
Wen Liu ◽  
Rui Guo ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
3D Structure ◽  
Lithium Ion ◽  
Rate Performance ◽  
Free Standing ◽  
Flexible Membrane ◽  
Reduced Graphene

Free-standing rGO/MnO2–rGO–CNT flexible membrane with a 2D/3D structure shows improved cycling and rate performance at flat and bending states.

3D conductive network-based free-standing PANI–RGO–MWNTs hybrid film for high-performance flexible supercapacitor

2014 ◽  
Vol 2 (31) ◽  
pp. 12340-12347 ◽  
Author(s):  
Haosen Fan ◽  
Ning Zhao ◽  
Hao Wang ◽  
Jian Xu ◽  
Feng Pan
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Hybrid Film ◽  
Conductive Network ◽  
Free Standing ◽  
Flexible Supercapacitor ◽  
Reduced Graphene

A facile method was successfully established to construct 3D conductive network-based free-standing polyaniline/reduced graphene oxide/carbon nanotube ternary hybrid film, in which a 3D conductive network was synergistically assembled by MWNTs and GO.

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