Synthesis and Characterization of Silica-LiMn2O4 Core-Shell Nanosphere Cathodes

2013 ◽  
Vol 1540 ◽  
Author(s):  
Jong-Moon Lee ◽  
Soon-Kie Hong ◽  
Won Il Cho ◽  
In-Hyeong Yeo ◽  
Sun-il Mho
Keyword(s):  
Silica Surface ◽  
Lithium Salt ◽  
Cycling Performance ◽  
Core Shell ◽  
Cycle Stability ◽  
Capacity Retention ◽  
The Core ◽  
Structurally Stable ◽  
Charge Discharge

ABSTRACTIn order to improve the charge/discharge cycling performance of the LiMn2O4 cathode, the spinel LiMn2O4 is coated on the structurally stable SiO2 nanosphere cores, LiMn2O4@SiO2. The core-shell LiMn2O4@SiO2 nanosphere cathodes are prepared by the MnCO3 precipitation on the silica surface and the following solid state reaction of MnCO3@SiO2 with a lithium salt. The charge/discharge cycle stability has improved by the nanostructural characteristics of the LiMn2O4@ shell on the SiO2 core. The cathode composed of LiMn2O4@SiO2 nanospheres exhibits higher capacity retention of 97% than that of LiMn2O4 nanoparticles of 89%, after 100 battery cycles at a 10C rate.

Preparation and Characterization of SiO2-PMMA with Different Shell Thickness Using AGET ATRP

2013 ◽  
Vol 634-638 ◽  
pp. 1951-1954 ◽  
Author(s):  
Lei Zhang ◽  
Guo Wei Zhou ◽  
Min Nan Zhao
Keyword(s):  
Electron Transfer ◽  
1H Nmr ◽  
Shell Thickness ◽  
Silica Surface ◽  
Core Shell ◽  
Aget Atrp ◽  
The Core ◽  
Ft Ir ◽  
Shell Composite

Monodispersed SiO2-core/PMMA-shell composite nanospheres have been prepared via activator generated by electron transfer atom transfer radical polymerization (AGET ATRP) mediated by an iron (III) catalyst. By simply adjusting the amount of monomer, the shell thickness of products can easily be tuned. Samples were characterized by FT-IR, TEM, 1H NMR. The results showed that the sphere structure kept unchanging after grafting. FT-IR and 1H NMR measurements show that the polymer was grafted on the silica surface successfully. TEM results for composite nanospheres suggested the core-shell-like structure of the hybrid nanoparticle.

Capacitive behaviour of functionalized carbon nanotube/ZnO composites coated on a glassy carbon electrode

2015 ◽  
Vol 3 (30) ◽  
pp. 15650-15660 ◽  
Author(s):  
Jagruti S. Suroshe ◽  
Shivram S. Garje
Keyword(s):  
Carbon Nanotube ◽  
Glassy Carbon ◽  
Electrode Materials ◽  
Carbon Electrode ◽  
Single Source ◽  
Cycle Stability ◽  
Single Source Precursor ◽  
Functionalized Carbon Nanotube ◽  
Charge Discharge

Synthesis, characterization of functionalized carbon nanotube/ZnO composites by solvothermal decomposition of a single source precursor and their use as electrode materials for supercapacitors with good reversible charge/discharge ability and cycle stability.

scholarly journals Recent progress in characterization of the core–shell structure of black titania

2019 ◽  
Vol 34 (07) ◽  
pp. 1138-1153 ◽  
Author(s):  
Mengkun Tian ◽  
Chenze Liu ◽  
Jingxuan Ge ◽  
David Geohegan ◽  
Gerd Duscher ◽  
...  
Keyword(s):  
Shell Structure ◽  
Recent Progress ◽  
Core Shell ◽  
The Core ◽  
Core Shell Structure ◽  
Image Position

Abstract

Preparation of Fe3O4@polypyrrole Composite Materials for Asymmetric Supercapacitor Applications

2021 ◽  
Author(s):  
Shiyun Li ◽  
Ling Zhang ◽  
Luxi Zhang ◽  
Yuqiong Guo ◽  
Xuecheng Chen ◽  
...  
Keyword(s):  
Composite Materials ◽  
High Capacity ◽  
Core Shell ◽  
Asymmetric Supercapacitor ◽  
Cycle Stability ◽  
The Core ◽  
Polypyrrole Composite ◽  
Supercapacitor Applications

Although Fe3O4 has high capacity, the low conductivity and poor cycle stability have limited its application in supercapacitor. To address this issue, the core-shell structured Fe3O4@polypyrrole (Fe3O4@PPy) composite materials could...

Ni3S2/Ni(OH)2 Directly Grown on Ni Foam for Battery-Type Electrode with Super Long Cycle Stability

2020 ◽  
Vol 20 (8) ◽  
pp. 4722-4729
Author(s):  
Chunli Guo ◽  
Li Wang ◽  
Zeying Yan ◽  
Yuyu Zhang ◽  
Jie Li ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Potential Application ◽  
Cycling Performance ◽  
Cycle Stability ◽  
Ni Foam ◽  
Capacity Retention ◽  
Hybrid Device ◽  
Long Cycle ◽  
Areal Capacity

The Ni3S2/Ni(OH)2 electrode could deliver a high areal capacity of 1.58 C/cm2 at 2 mA/cm2, along with outstanding cycling stability (113% capacity retention after 30,000 cycles). The energy density of the Ni3S2/Ni(OH)2//AC hybrid device was 30.23 Wh/kg at a power density of 155 W/kg (15.5 Wh/kg at 3,875 W/kg). Compared with other Ni(OH)2 composites on Ni foam, these results indicate that Ni3S2/Ni(OH)2 directly grown on Ni foam opens up the potential application for energystorage devices with high areal capacity and high cycling performance.

Effect of Calcination Temperature on the Morphology of Carbon Nanosphere Synthesized from Polymethylmethacrylate

2014 ◽  
Vol 974 ◽  
pp. 55-59 ◽  
Author(s):  
Abdullah F. Al-Ahmadi ◽  
Mohammed A. Al-Daous ◽  
Tawfik A. Saleh
Keyword(s):  
Calcination Temperature ◽  
Core Shell ◽  
Carbon Nanospheres ◽  
Batch Mode ◽  
Resorcinol Formaldehyde ◽  
X Ray ◽  
The Core ◽  
Shell Particles ◽  
Hollow Carbon

In this work, hollow carbon nanospheres (HCNs) were synthesized by carbonizing core/shell particles of polymethylmethacrylate (PMMA)/ resorcinol formaldehyde. The core/shell particles were prepared using emulsion polymerization; polymethylmethacrylate as a template and resorcinol-formaldehyde polymer as the carbon source. Spheres were first synthesized by batch mode polymerization and then the shell was polymerized on the surface of the spheres. The composite was stabilized, and then carbonized. The effect of calcination temperature was investigated in the range between 200-500oC. Scanning electron microscopy (SEM), energy-dispersive X-ray spectrometer (EDX), Raman and Fourier transform infrared (FTIR) were used for characterization of the resulting carbon.

Synthesis and Characterization of the Core-Shell Au/Ga2O3 Nanowires

2013 ◽  
Vol 50 (6) ◽  
pp. 117-120
Author(s):  
B.-H. Wu ◽  
C. W. Hsu ◽  
L.-J. Chou
Keyword(s):  
Synthesis And Characterization ◽  
Core Shell ◽  
The Core

Preparation and characterization of a core–shell KNO3@alginate-Ca particle with uranium-removal and slow-release of KNO3

RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 112065-112078 ◽  
Author(s):  
Yahui Zhang ◽  
Xiaoyan Lin ◽  
Hongyan Liu ◽  
Yuanyuan Qu ◽  
Xuegang Luo
Keyword(s):  
Slow Release ◽  
Core Shell ◽  
The Core ◽  
Potassium Release ◽  
Uranium Removal

A novel core–shell KNO3@alginate-Ca particle was prepared by a facile method of electro-coextrusion. The core–shell KNO3@alginate-Ca particle was a promising adsorbent for uranium removal and a slow-release material for potassium release.

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