Synthesis, characterisation and enhanced electrochemical performance of nanostructured Na2FePO4F for sodium batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50155-50164 ◽  
Author(s):  
Markas Law ◽  
Vishwanathan Ramar ◽  
Palani Balaya
Keyword(s):  
Heat Treatment ◽  
High Energy ◽  
Soft Template ◽  
Template Method ◽  
Post Heat Treatment ◽  
Storage Performance ◽  
Sodium Batteries ◽  
Energy Ball ◽  
Enhanced Electrochemical Performance ◽  
Sodium Storage

Nanostructured Na2FePO4F was synthesised by a soft template method, followed by high-energy ball milling (HEBM) and post-heat treatment. The HEBM sample shows excellent sodium storage performance with a discharge capacity of 116 mA h g−1at 0.1 C.

Ultrahigh-energy sodium ion capacitors enabled by the enhanced intercalation pseudocapacitance of self-standing Ti2Nb2O9/CNF anodes

Nanoscale ◽  
2021 ◽  
Vol 13 (37) ◽  
pp. 15781-15788
Author(s):  
Liaona She ◽  
Feng Zhang ◽  
Congying Jia ◽  
Liping Kang ◽  
Qi Li ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
Sodium Ion ◽  
High Energy Density ◽  
Ultrahigh Energy ◽  
Storage Performance ◽  
Sodium Storage

Ti2Nb2O9/CNF anode with excellent sodium storage performance is fabricated by electrospinning and carbonization treatment. The assembled Ti2Nb2O9/CNF//AC SIC exhibits a high energy density of 129 W h kg-1 at 75 W kg-1.

scholarly journals Influence of Preparation Process on Microstructure, Critical Current Density and Tc of MgB2/Fe/Cu Wires

2007 ◽  
Vol 546-549 ◽  
pp. 2031-2034
Author(s):  
Y.F. Wu ◽  
G. Yan ◽  
J.S. Li ◽  
Y. Feng ◽  
Shao Kai Chen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Current Density ◽  
Rolling Process ◽  
High Energy ◽  
Transport Current ◽  
Post Heat Treatment ◽  
Mechanically Alloyed ◽  
Mgb2 Wires ◽  
Powder In Tube ◽  
Transport Current Density

The powder-in-tube MgB2 wires were prepared by high energy milling of Mg and B powder. The powder was not mechanically alloyed for 2h short milling time. However, the MgB2 grains in wires were very small (20~100nm) and resemble the dimple after post-heat treatment. The clear evidence for transcrystlline fracture was observed. It indicated that the grain connection was greatly improved and the fluxing pinning was significantly enhanced. Another point to view was no intermediate annealing during the whole rolling process. The influence of the post-heat treatment on the transport current density was studied. Despite the lower Tc of about 35K, the transport current density reached to 3×104A/cm2 at 15K and 3.5T for wires sintered at 700°C.

scholarly journals Magnetic Properties of SmCo5 + 10 wt% Fe Exchange-Coupled Nanocomposites Produced from Recycled SmCo5

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1308 ◽  
Author(s):  
Arnab Chakraborty ◽  
Răzvan Hirian ◽  
Gregor Kapun ◽  
Viorel Pop
Keyword(s):  
Heat Treatment ◽  
Exchange Coupling ◽  
Permanent Magnets ◽  
High Energy ◽  
Raw Material ◽  
Energy Ball ◽  
Hydrogen Decrepitation ◽  
Energy Products ◽  
First Time ◽  
Recycled Material

Nanostructured alloy powders of SmCo5 + 10 wt% Fe obtained using recycled material were studied for the first time. The SmCo5 precursor was obtained from commercial magnets recycled by hydrogen decrepitation. The results were compared with identically processed samples obtained using virgin SmCo5 raw material. The samples were synthesized by dry high-energy ball-milling and subsequent heat treatment. Robust soft/hard exchange coupling was observed—with large coercivity, which is essential for commercial permanent magnets. The obtained energy products for the recycled material fall between 80% and 95% of those obtained when using virgin SmCo5, depending on milling and annealing times. These results further offer viability of recycling and sustainability in production. These powders and processes are therefore candidates for the next generation of specialized and nanostructured exchange-coupled bulk industrial magnets.

Electrochemical construction and sodium storage performance of three-dimensional porous self-supported MoS2 electrodes

2018 ◽  
Vol 11 (03) ◽  
pp. 1850050 ◽  
Author(s):  
Xiao-Yong Fan ◽  
Pan Liu ◽  
Shan Wang ◽  
Jiaxing Han ◽  
Kefan Ni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Coulombic Efficiency ◽  
Three Dimensional ◽  
Reversible Capacity ◽  
Volumetric Expansion ◽  
Storage Performance ◽  
High Temperature Heat Treatment ◽  
Heat Treated ◽  
Electrochemical Cycling ◽  
Sodium Storage

Three-dimensional (3D) porous self-supported MoS2 electrodes are constructed by electrodepositing coupled with high-temperature heat treatment using 3D porous Cu prepared via electroless plating as the substrate, and directly used as anode of sodium-ion battery. The 3D porous structure can accommodate the volumetric expansion/shrinkage and alleviate the stress caused from the large volumetric changes of MoS2 electrodes during electrochemical cycling. Meanwhile, large surface area of this unique configuration enables sufficient electrode/electrolyte interaction and fast electron transportation. Besides, the influence of heat treatment temperatures on the sodium storage performance of MoS2 electrode is also investigated. The electrochemical test result shows that the 3D porous self-supported MoS2 electrode heat treated at 350[Formula: see text]C has the best electrochemical performance. It demonstrates a high first reversible capacity of 714.1[Formula: see text]mAh g[Formula: see text] at 50[Formula: see text]mA g[Formula: see text] with a high first Coulombic efficiency of 84%, and a good capacity retention of 306.8[Formula: see text]mAh g[Formula: see text] after 100 cycles at 2[Formula: see text]A g[Formula: see text]. The reversible capacity at 3.2[Formula: see text]A g[Formula: see text] shows high value of 241[Formula: see text]mAh g[Formula: see text], which is 37% of that at 0.05[Formula: see text]A g[Formula: see text].

Preparation of Nb–25Si, Nb–37.5Si, Nb–66.6Si powders by high-energy ball milling and subsequent heat treatment

2007 ◽  
Vol 434-435 ◽  
pp. 509-513 ◽  
Author(s):  
Bruno Bacci Fernandes ◽  
Erika Coaglia Trindade Ramos ◽  
Gilbert Silva ◽  
Alfeu Saraiva Ramos
Keyword(s):  
Heat Treatment ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Subsequent Heat Treatment ◽  
Energy Ball
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