Creation of micro and macro spaces by electrospinning and application to electrode materials of energy devices

MRS Advances ◽  
2020 ◽  
Vol 5 (27-28) ◽  
pp. 1423-1431
Author(s):  
K. Oshida ◽  
N. Kobayashi ◽  
K. Osawa ◽  
Y. Takizawa ◽  
T. Itaya ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Electrode Materials ◽  
Lithium Ion ◽  
Hybrid Vehicles ◽  
Cycle Performance ◽  
Storage Devices ◽  
Energy Devices ◽  
Performance Improvements ◽  
Transmission Electron

ABSTRACTThis study aims to create controlled fine space by electrospinning, and to develop the electrode materials for high-performance energy devices. With the popularization of mobile devices, household appliances, hybrid vehicles, electric vehicles, and the like, the use of power storage devices is expanding, and further performance improvements are required. In this study, a novel electrode material was developed by compositing Si with carbon nanofibers derived from polyacrylonitrile (PAN) by electrospinning and heat treatment. The texture and structure of the nanofibers were observed and analyzed by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX) and transmission electron microscopy (TEM) combined with image processing. Nano spaces were created in the CNFs and Si particles were able to be contained in the CNFs. In the second and subsequent cycles of the charge/discharge experiments of lithium ion battery (LIB) electrode made from the materials, the capacity was more than twice the theoretical capacity using graphite, and good cycle performance was obtained.

scholarly journals Ce-Doped PANI/Fe3O4 Nanocomposites: Electrode Materials for Supercapattery

2021 ◽  
Vol 3 ◽  
Author(s):  
Subash Pandey ◽  
Shova Neupane ◽  
Dipak Kumar Gupta ◽  
Anju Kumari Das ◽  
Nabin Karki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrode Material ◽  
High Performance ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Maximum Energy ◽  
Potential Range ◽  
X Ray Diffraction ◽  
Active Electrode ◽  
Transmission Electron

In this study, we report on a combined approach to preparing an active electrode material for supercapattery application by making nanocomposites of Polyaniline/Cerium (PANI/Ce) with different weight percentages of magnetite (Fe3O4). Fourier-transform infrared spectroscopy (FTIR) and x-ray diffraction (XRD) analyses supported the interaction of PANI with Ce and the formation of the successful nanocomposite with magnetite nanoparticles. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses showed the uniform and porous morphology of the composites. Cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) were used to test the supercapattery behavior of the nanocomposite electrodes in 1.0 M H2SO4. It was found that the supercapattery electrode of PANI/Ce+7 wt.% Fe3O4 exhibited a specific capacity of 171 mAhg−1 in the potential range of −0.2 to 1.0 V at the current density of 2.5 Ag−1. Moreover, PANI/Ce+7 wt.% Fe3O4 revealed a power density of 376.6 Wkg−1 along with a maximum energy density of 25.4 Whkg−1 at 2.5 Ag−1. Further, the cyclic stability of PANI/Ce+7 wt.% Fe3O4 was found to be 96.0% after 5,000 cycles. The obtained results suggested that the PANI/Ce+Fe3O4 nanocomposite could be a promising electrode material candidate for high-performance supercapattery applications.

Porous Activity of Biomass-Activated Carbon Enhanced by Nitrogen-Dopant Towards High-Performance Lithium Ion Hybrid Battery-Supercapacitor

2021 ◽  
Author(s):  
Juan Yu ◽  
Xuyang Wang ◽  
Jiaxin Peng ◽  
Xuefeng Jia ◽  
Linbo Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Storage ◽  
Pore Structure ◽  
High Performance ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Utilization Efficiency ◽  
Energy Storage Devices ◽  
Storage Devices

Abstract Biomass-activated carbon materials are promising electrode materials for lithium-ion hybrid capacitors (LiCs) because of their natural hierarchical pore structure. The efficient utilization of structural pores in activated carbon is very important for their electrochemical performance. Herein, porous biomass-activated carbon (PAC) with large specific surface area was prepared using a one-step activation method with biomass waste as the carbon source and ZnCl2 as the activator. To further improve its pore structure utilization efficiency, the PAC was doped with nitrogen using urea as the nitrogen source. The experimental results confirmed that PAC-1 with a high nitrogen doping level of 4.66% exhibited the most efficient pore utilization among all the samples investigated in this study. PAC-1 exhibited 92% capacity retention after 8000 cycles, showing good cycling stability. Then, to maximize the utilization of high-efficiency energy storage devices, LiNi0.8Co0.15Al0.05O2 (NCA), a promising cathode material for lithium-ion batteries with high specific capacity, was compounded with PAC-1 in different ratios to obtain NCA@PC composites. The NCA@PC-9 composite exhibited excellent capacitance in LiCs and an energy density of 210.9 Wh kg-1 at a high power density of 13.3 kW kg-1. These results provide guidelines for the design of high-performance and low-cost energy storage devices.

scholarly journals Electrodeposition and Characterization of Mesoporous Nanostructured Cobalt Films using Brij78 Templated

2015 ◽  
Vol 18 (3) ◽  
pp. 165-168 ◽  
Author(s):  
M. A. Ghanem ◽  
I. S. El-Hallag
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Electrode Materials ◽  
X Ray Diffraction ◽  
Uniform Size ◽  
Cobalt Films ◽  
Transmission Electron ◽  
Ordered Mesoporous ◽  
Mesoporous Thin Films

In this manuscript the preparation of highly ordered mesoporous cobalt films containing close packed arrays of spherical holes of uniform size was demonstrated by electrochemical deposition using the hexagonal liquid crystal template (H1-e Co). The template used was Brij®78 surfactant. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), voltammetric methods, and low angle X-ray diffraction (XRD) were used to characterize the electrodeposited mesopores films. Cyclic voltammetry (CV) technique are used to show the mesoporous thin films are promising to be used as electrode materials of high - performance super capacitors.

scholarly journals A Cryogenic Milling Method to Fabricate Nanostructured Anodes

2020 ◽  
Author(s):  
Qizhang Yan ◽  
Shu-Ting Ko ◽  
Yumin Zhao ◽  
Grace Whang ◽  
Andrew Dawson ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Electrode Materials ◽  
Coulombic Efficiency ◽  
Graphite Powder ◽  
Cryogenic Milling ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Battery Electrode ◽  
Milling Method

Cryogenic milling was demonstrated as a new and facile method to fabricate nanostructured battery electrode materials. SnSb anode material with 1.2 wt% graphite was selected as a model system to demonstrate the feasibility and benefits of this method. Ball milling at a cryogenic temperature can suppress cold welding, exfoliate bulk graphite powder into nanoplatelets, and evenly disperse them between the grains. Aberration-corrected scanning transmission electron microscopy and post-cycling scanning electron microscopy showed refined grain sizes and well-dispersed carbon nanoplatelets, which can stabilize the nanostructure and alleviate volume expansion and cracking upon cycling. The cryomilled SnSb-C composite anode showed a reversible volumetric capacity of 1842 Ah/L, average coulombic efficiency of 99.6 ± 0.3%, and capacity retention of 90% over 100 cycles. The cryomilled sample showed improved electrochemical performance compared to the conventional ball milled specimen. This new method of cryogenic milling can produce various other high-performance nanostructured electrode materials.

scholarly journals A Cryogenic Milling Method to Fabricate Nanostructured Anodes

2020 ◽  
Author(s):  
Qizhang Yan ◽  
Shu-Ting Ko ◽  
Yumin Zhao ◽  
Grace Whang ◽  
Andrew Dawson ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Electrode Materials ◽  
Coulombic Efficiency ◽  
Graphite Powder ◽  
Cryogenic Milling ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Battery Electrode ◽  
Milling Method

Cryogenic milling was demonstrated as a new and facile method to fabricate nanostructured battery electrode materials. SnSb anode material with 1.2 wt% graphite was selected as a model system to demonstrate the feasibility and benefits of this method. Ball milling at a cryogenic temperature can suppress cold welding, exfoliate bulk graphite powder into nanoplatelets, and evenly disperse them between the grains. Aberration-corrected scanning transmission electron microscopy and post-cycling scanning electron microscopy showed refined grain sizes and well-dispersed carbon nanoplatelets, which can stabilize the nanostructure and alleviate volume expansion and cracking upon cycling. The cryomilled SnSb-C composite anode showed a reversible volumetric capacity of 1842 Ah/L, average coulombic efficiency of 99.6 ± 0.3%, and capacity retention of 90% over 100 cycles. The cryomilled sample showed improved electrochemical performance compared to the conventional ball milled specimen. This new method of cryogenic milling can produce various other high-performance nanostructured electrode materials.

Heteroatom-doped carbonaceous electrode materials for high performance energy storage devices

2018 ◽  
Vol 2 (7) ◽  
pp. 1398-1429 ◽  
Author(s):  
Afzal Shah ◽  
Anum Zahid ◽  
Hanif Subhan ◽  
Azeema Munir ◽  
Faiza Jan Iftikhar ◽  
...  
Keyword(s):  
Energy Storage ◽  
High Performance ◽  
Electrode Materials ◽  
Energy Generation ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Energy Devices ◽  
Efficient Energy

Heteroatom-doped carbons are attractive materials for efficient energy generation as these can catalyse reactions in high performance energy devices.

scholarly journals Ternary Sulfur/Polyacrylonitrile/SiO2 Composite Cathodes for High-Performance Sulfur/Lithium Ion Full Batteries

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 930 ◽  
Author(s):  
Yusen He ◽  
Zhenzhen Shan ◽  
Taizhe Tan ◽  
Zhihong Chen ◽  
Yongguang Zhang
Keyword(s):  
Electron Microscopy ◽  
High Performance ◽  
Composite System ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Discharge ◽  
High Discharge Capacity ◽  
Transmission Electron ◽  
Composite Cathodes ◽  
Effective Additive

In the present study, a novel sulfur/lithium-ion full battery was assembled while using ternary sulfur/polyacrylonitrile/SiO2 (S/PAN/SiO2) composite as the cathode and prelithiated graphite as the anode. For anode, Stabilized Lithium Metal Powder (SLMP) was successfully transformed into lithiated graphite anode. For cathode, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that SiO2 was uniformly distributed on S/PAN composites, where SiO2 served as an effective additive due to its ultra high absorb ability and enhanced ability in trapping soluble polysulfide. The tested half-cell based on S/PAN/SiO2 composite revealed high discharge capacity of 1106 mAh g−1 after 100 cycles at 0.2 C. The full cell based on prelithiated graphite//S/PAN/SiO2 composite system delivered a specific capacity of 810 mAh g−1 over 100 cycles.

Nanostructural Study of Silicon-Cobalt/Nitrogen-Doped Reduced Graphene Oxide Composites by Electron Microscopy for Using as Anode Material in Lithium-Ion Batteries

2018 ◽  
Vol 283 ◽  
pp. 37-45
Author(s):  
Thanapat Autthawong ◽  
Bralee Chayasombat ◽  
Viratchara Laokawee ◽  
Nutpaphat Jarulertwathana ◽  
Takuya Masuda ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Modified Polyol Method ◽  
Oxide Composites

Silicon-cobalt nanocomposites on NrGO, Si-Co/NrGO, were synthesized by the modified polyol method. Rice husk was used as the silicon source. The composites were primarily characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy equipped with energy dispersive spectroscopy. The small-sized particles of the silicon-cobalt product were effectively distributed on the NrGO. Finally, these anode materials were tested in lithium-ion batteries by haft-coin cell assembly. Electrochemical properties were measured and the result showed an initial capacity of 975 mAh g-1. This material is expected to be used as a high-performance anode, suitable for the next generation of anode materials in lithium-ion batteries.

Mechanistic Study of Electrode Materials for Rechargeable Batteries beyond Lithium Ion by In-situ Transmission Electron Microscopy

2021 ◽  
Author(s):  
Shaojun Guo ◽  
yousaf Muhammad ◽  
Ufra Naseer ◽  
Yiju Li ◽  
Zeeshan Ali ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Lithium Ion ◽  
Rechargeable Batteries ◽  
Electrochemical Process ◽  
Atomic Scale ◽  
Mechanistic Study ◽  
Electrochemical Reactions ◽  
Transmission Electron

Understanding the fundamental mechanisms of advanced electrode materials at the atomic scale during the electrochemical process is condemnatory to develop the high-performance rechargeable batteries. The complex electrochemical reactions involved inside...

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