Effects of Washing and Heat-treatment on Structure and Electrochemical Charge/Discharge Property for LiNi$lt;inf$gt;0.8$lt;/inf$gt;Co$lt;inf$gt;0.15$lt;/inf$gt;Al$lt;inf$gt;0.05$lt;/inf$gt;O$lt;inf$gt;2$lt;/inf$gt; Powder

2016 ◽  
Vol 31 (7) ◽  
pp. 773 ◽  
Author(s):  
LI Jian ◽  
CHEN Bao-Rong ◽  
ZHOU Hong-Ming
Keyword(s):  
Heat Treatment ◽  
Charge Discharge

Effect of Heat Treatment on Charge-Discharge Property of Fluoride Cathode Materials for Li Ion Secondary Batteries

2013 ◽  
Vol 566 ◽  
pp. 131-134 ◽  
Author(s):  
Yasumasa Tomita ◽  
Jinta Kato ◽  
Yoshiumi Kohno ◽  
Yasuhisa Maeda ◽  
Kenkichiro Kobayashi
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Cathode Materials ◽  
Mechanical Milling ◽  
Fine Particle ◽  
Discharge Rate ◽  
Milling Process ◽  
Li Ion ◽  
Discharge Measurements ◽  
Charge Discharge

ron fluoride (III) anhydrate fine particle was prepared by drying in vacuum from FeF3·3H2O, a mechanical milling process and a calcination at 473 773 K. Particle size of FeF3·3H2O was ca. 3 5 μm and that of FeF3 anhydrate was 100 500 nm after drying and milling. FeF3 sample only after drying and milling was hygroscopic and became FeF3·3H2O under atmosphere. FeF3 became stable under atmosphere after oxidation at 673 K for more than 20 minutes. It was found that Fe2O3 was produced by calcination and covered the surface of FeF3 particles. In Charge-discharge measurements, the discharge capacity of these FeF3 samples was 150 - 200 mAh/g at a discharge rate of 0.1 C. The oxidation could improve the discharge properties of FeF3 cathode.

High-Rate Charge-Discharge Performance of Composite Electrodes of FeOOH-Based Amorphous Particles and Carbon Powder

2008 ◽  
Vol 388 ◽  
pp. 33-36
Author(s):  
Hideyuki Morimoto ◽  
Kazuhiko Takeno ◽  
Tsuyoshi Takahashi ◽  
Kensaku Hayashi ◽  
Shinichi Tobishima
Keyword(s):  
Heat Treatment ◽  
Electrode Materials ◽  
High Rate ◽  
Cycle Performance ◽  
Carbon Powder ◽  
Composite Electrodes ◽  
Discharge Current Density ◽  
Discharge Performance ◽  
Amorphous Particles ◽  
Charge Discharge

Composite electrode materials of amorphous FeOOH-based particles and carbon powder were prepared by heat treatment of composite powder obtained by hydrolyzing of mixed aqueous solutions of FeCl3 and Ti(SO4)2 into which electron conducting carbon powder was dispersed. They exhibited high capacities over 150 mAh g-1 and good cycle performance at large charge-discharge current density of 5 mA cm-2 (ca. 1 A g-1). In this case, the heat treatment was effective process to improve the cycle performance.

Recycling of Waste Toner and its Electrochemical Performances for Supercapacitor

2014 ◽  
Vol 675-677 ◽  
pp. 689-692
Author(s):  
Ji Qing Mao ◽  
Yang Li
Keyword(s):  
Heat Treatment ◽  
Cyclic Voltammetry ◽  
Electrode Material ◽  
Active Material ◽  
Electrochemical Performances ◽  
Discharge Process ◽  
Oxide Structure ◽  
Resource Recycling ◽  
Potential Alternative ◽  
Charge Discharge

Utilization of the waste toner in wasted print cartridge was beneficial to the environmental protection and resource recycling. Fe3O4 has been obtained from the waste toner via magnetic separation and heat-treatment in present study. XRD measurement revealed the recuperated sample has ferriferrous oxide structure without other crystalline impurity. The electrochemical performances of recuperated Fe3O4, as the electrode active material for supercapacitor, was conducted by cyclic voltammetry and charge-discharge process. The results showed that the specific capacitance of Fe3O4 achieved 76.5 F/g under 50 mA/g current density, which possessed typical capacitive behaviors and good cycling stabilities. Based on the preferable electrochemical performances, Fe3O4 recovered from waste toner may be a potential alternative as electrode material for supercapacitor.

The Preparation and Performance Study of Tin-Nickel Alloy Based Lithium Battery Anode Material

2012 ◽  
Vol 519 ◽  
pp. 113-117
Author(s):  
Li Ming Feng ◽  
Yan Liu ◽  
Jian Gang Zhang
Keyword(s):  
Heat Treatment ◽  
Nickel Alloy ◽  
Anode Material ◽  
Mass Fraction ◽  
Lithium Battery ◽  
Specific Capacity ◽  
Spherical Particles ◽  
Discharge Cycle ◽  
Battery Anode ◽  
Charge Discharge

Based on copper foil, this paper takes electrodeposition to prepare tin-nickel alloy based anode material, which is of Sn 81.23% (Mass Fraction, the same as below), and Ni 18.77% (Mass Fraction, the same as below). It also studies the plating state, and plating structures and its electrochemical properties under heat treatment at different temperatures. The X-ray diffraction analysis (XRD) shows that the plating structures are all Ni3Sn4 and unalloyed individual-phase Sn under plating state and 200 oC heat treatment, and are Ni3Sn2 , Sn, Ni3Sn2 , Ni3Sn4 under 300 oC and 450 oC heat treatment respectively. In a button cell, which was made up with lithium slice, the results of charge-discharge cycle test and cyclic voltammetric curves test indicate that tin-nickel alloy’s specific capacity and charge-discharge cycle performance are related to the heat treatment temperature and structure of lithium battery anode material. The plating under plating state and 200oC heat treatment has high specific capacity, and its charge-discharge stability is well above that of the plating under other temperatures. Under 200 oC heat treatment, the plating could crystallize better and increase its content of Ni3Sn4. Its charge-discharge stability would be well above that of the original plating state. The scanning electron microscope (SEM) shows that before discharging, the plating of tin-nickel alloy was made up of small spherical particles, which are uniform and dense. The plating began to swell and crack after 50 times charge-discharge, which may lead to rapidly attenuate the plating’s specific charging capacity.

The Precipitation of Si in AlCuSi Thin Films

1973 ◽  
Vol 31 ◽  
pp. 34-35 ◽  
Author(s):  
R. M. Anderson
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Heat Treatment ◽  
Solid Solution ◽  
Integrated Circuit ◽  
Copper Film ◽  
Solution Concentration ◽  
X Ray ◽  
Silicon Thin Films ◽  
Before And After

Aluminum-copper-silicon thin films have been considered as an interconnection metallurgy for integrated circuit applications. Various schemes have been proposed to incorporate small percent-ages of silicon into films that typically contain two to five percent copper. We undertook a study of the total effect of silicon on the aluminum copper film as revealed by transmission electron microscopy, scanning electron microscopy, x-ray diffraction and ion microprobe techniques as a function of the various deposition methods.X-ray investigations noted a change in solid solution concentration as a function of Si content before and after heat-treatment. The amount of solid solution in the Al increased with heat-treatment for films with ≥2% silicon and decreased for films <2% silicon.

The influence of heat treatment on the fiber/matrix interface in a SiC-reinforced glassceramic

1988 ◽  
Vol 46 ◽  
pp. 742-743
Author(s):  
E. Bischoff ◽  
O. Sbaizero
Keyword(s):  
Heat Treatment ◽  
Aluminum Silicate ◽  
Lithium Aluminum ◽  
Interfacial Region ◽  
Specimen Preparation ◽  
Crack Wake ◽  
Pull Out ◽  
Annealed Material ◽  
Ultrasonic Drilling ◽  
Fiber Matrix Interface

Fiber or whisker reinforced ceramics show improved toughness and strength. Bridging by intact fibers in the crack wake and fiber pull-out after failure contribute to the additional toughness. These processes are strongly influenced by the sliding and debonding resistance of the interfacial region. The present study examines the interface in a laminated 0/90 composite consisting of SiC (Nicalon) fibers in a lithium-aluminum-silicate (LAS) glass-ceramic matrix. The material shows systematic changes in sliding resistance upon heat treatment.As-processed samples were annealed in air at 800 °C for 2, 4, 8, 16 and 100 h, and for comparison, in helium at 800 °C for 4 h. TEM specimen preparation of as processed and annealed material was performed with special care by cutting along directions having the fibers normal and parallel to the section plane, ultrasonic drilling, dimpling to 100 pm and final ionthinning. The specimen were lightly coated with Carbon and examined in an analytical TEM operated at 200 kV.

Strain-induced martensite effects on transgranular carbide precipitation in type 304 stainless steels

1991 ◽  
Vol 49 ◽  
pp. 604-605
Author(s):  
A.H. Advani ◽  
L.E. Murr ◽  
D. Matlock
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Deformation Twin ◽  
Austenitic Stainless Steels ◽  
Carbide Precipitation ◽  
Strain Induced Martensite ◽  
Type 304

Thermomechanically induced strain is a key variable producing accelerated carbide precipitation, sensitization and stress corrosion cracking in austenitic stainless steels (SS). Recent work has indicated that higher levels of strain (above 20%) also produce transgranular (TG) carbide precipitation and corrosion simultaneous with the grain boundary phenomenon in 316 SS. Transgranular precipitates were noted to form primarily on deformation twin-fault planes and their intersections in 316 SS.Briant has indicated that TG precipitation in 316 SS is significantly different from 304 SS due to the formation of strain-induced martensite on 304 SS, though an understanding of the role of martensite on the process has not been developed. This study is concerned with evaluating the effects of strain and strain-induced martensite on TG carbide precipitation in 304 SS. The study was performed on samples of a 0.051%C-304 SS deformed to 33% followed by heat treatment at 670°C for 1 h.

Effect of a Complex Heat Treatment on the Structure of 300M Steel

1981 ◽  
Vol 39 ◽  
pp. 312-313
Author(s):  
R. Padmanabhan ◽  
W. E. Wood
Keyword(s):  
Heat Treatment ◽  
Metal Carbides ◽  
Austenite Grain Size ◽  
300M Steel ◽  
Heat Treated ◽  
Strain Fracture ◽  
Prior Austenite Grain Size ◽  
Short Time ◽  
Final Tempering ◽  
Similar Yield

Intermediate high temperature tempering prior to subsequent reaustenitization has been shown to double the plane strain fracture toughness as compared to conventionally heat treated UHSLA steels, at similar yield strength levels. The precipitation (during tempering) of metal carbides and their subsequent partial redissolution and refinement (during reaustenitization), in addition to the reduction in the prior austenite grain size during the cycling operation have all been suggested to contribute to the observed improvement in the mechanical properties. In this investigation, 300M steel was initially austenitized at 1143°K and then subjected to intermediate tempering at 923°K for 1 hr. before reaustenitizing at 1123°K for a short time and final tempering at 583°K. The changes in the microstructure responsible for the improvement in the properties have been studied and compared with conventionally heat treated steel. Fig. 1 shows interlath films of retained austenite produced during conventionally heat treatment.

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