Effect of Al Content on Hydrogen Storage Properties of Amorphous Mg1-xAlxNi (x=0, 0.1, 0.2, 0.3) Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 946-950
Author(s):  
Jing Feng Wang ◽  
Pei Dao Ding ◽  
Shan Gao ◽  
Fu Sheng Pan ◽  
Ai Tao Tang
Keyword(s):  
Hydrogen Storage ◽  
Amorphous Phase ◽  
Discharge Capacity ◽  
Cycle Stability ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
Al Content ◽  
Synthesis Properties ◽  
Discharge Capacities ◽  
Storage Properties

In this paper，the influence of adding Al on the discharge capacity and cycle stability of amorphous MgNi-based hydrogen storage alloys were investigated. Amorphous Mg1-xAlxNi (x=0, 0.1, 0.2, 0.3) alloy powder was prepared successfully by mechanical alloying (MA). X-ray diffraction (XRD) results show that after ball milling with 15h, MgNi alloy formed completely amorphous phase. But for Mg1-xAlxNi (x=0.1, 0.2, 0.3) alloy, it took 30h. It can be concluded that Al partial substituting Mg would decrease the amorphous phase forming ability of Mg-Ni Based Alloy. The discharge capacities and cycle stabilities of these alloys were tested. Compared with amorphous MgNi alloy, the discharge capacities of Mg1-xAlxNi (x=0.1, 0.2, 0.3) alloy were decreased slightly, but the cycle stabilities were significantly enhanced. Mg0.9Al0.1Ni alloy showed the largest discharge capacity and Mg0.8Al0.2Ni alloy showed the best cycle stability. Over all, ternary Mg0.8Al0.1Ni alloy showed the best synthesis properties.

Effect of Ti Content on Hydrogen Storage Properties of Amorphous MgNi Alloy

2010 ◽  
Vol 650 ◽  
pp. 234-238
Author(s):  
Shan Gao ◽  
Jing Feng Wang ◽  
Pei Dao Ding ◽  
Fu Sheng Pan ◽  
Ai Tao Tang
Keyword(s):  
Amorphous Phase ◽  
Discharge Capacity ◽  
Cycle Stability ◽  
X Ray Diffraction ◽  
Hydrogen Storage Properties ◽  
Ni Alloys ◽  
Discharge Capacities ◽  
Ti Content ◽  
Maximal Discharge ◽  
Storage Properties

Cycle capacities of Amorphous Mg-Ni alloys declined so fast therefore they can’t be used practically. In this paper，the influence of adding Ti on the discharge capacity and cycle stability of the alloys were investigated. Amorphous Mg1-xTixNi (x=0, 0.1, 0.2, 0.3) alloy powder was prepared successfully by mechanical alloying (MA). X-ray diffraction (XRD) results show that MgNi alloy formed completely amorphous phase after ball milling with 15h. But for Mg1-xTixNi (x=0.1, 0.2, 0.3) alloy, it took 23h. It can be concluded that Ti partial substituting Mg would decrease the amorphous phase forming ability of Mg-Ni based alloy. Compared with amorphous MgNi alloy, the maximal discharge capacities of Mg1-xTixNi (x=0.1, 0.2, 0.3) alloy were decreased slightly, but the cycle stabilities were significantly enhanced. Mg0.9Ti0.1Ni alloy showed the largest discharge capacity and the best cycle stability.

Characteristics Before and After Heat Treatment of Co-Free AB3-Type Fe Substituted Hydrogen Storage Alloys Used for Ni-MH Batteries

2010 ◽  
Vol 129-131 ◽  
pp. 1049-1054 ◽  
Author(s):  
Feng Wu ◽  
Min Yu Zhang ◽  
Dao Bin Mu
Keyword(s):  
Heat Treatment ◽  
Hydrogen Storage ◽  
Discharge Capacity ◽  
Cycle Stability ◽  
Hydrogen Storage Alloys ◽  
Positive Effects ◽  
Fe Content ◽  
Before And After ◽  
Short Time ◽  
Positive Effect

In this paper, a series of hydrogen storage Co-free AB3-type alloys were directly synthesized with vacuum mid-frequency melting method, and melted alloys were treated by low temperature-short time heat annealing. XRD results indicate that the main phase of melted La0.7Mg0.3Ni3-xFex (x=0.0~0.4) alloys are LaMg2Ni9 and LaNi5 phase. After heat treatment, some LaMg2Ni9 phase transferred into LaNi3 phase because of the loss of Mg during the heat proceeding. The content of Fe element affects phase structure of alloys and led to different electrochemical properties. Heat treatment has positive effects on cycle stability of La0.7Mg0.3Ni3-xFex (x=0.0~0.4) alloys but could cause little reduction of discharge capacity of Fe substituted alloy. However, the discharge capacity of La0.7Mg0.3Ni2.8Fe0.2 alloy increased after heat treatment. The EIS results show that heat treatment has positive effect on H transfer within alloy, and Fe content is related to the diffusion coefficient of H atoms within alloys.

Microstructures and Electrochemical Properties of La0.7Ce0.3Ni3.7Co0.7-xAl0.2Mn0.4(Fe0.43B0.57)x (x = 0-0.4) Hydrogen Storage Alloys

2012 ◽  
Vol 608-609 ◽  
pp. 917-920
Author(s):  
Yu Zhou ◽  
Yan Ping Fan ◽  
Xian Yun Peng ◽  
Bao Zhong Liu
Keyword(s):  
Hydrogen Storage ◽  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Secondary Phase ◽  
Cycling Stability ◽  
High Rate ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
X Ray ◽  
The Matrix

X-ray diffraction results indicate that pristine alloy has a single LaNi5 phase and the alloys containing Fe0.43B0.57 consist of the matrix LaNi5 phase and the La3Ni13B2 secondary phase. The abundance of La3Ni13B2 phase increases with increasing x value. Maximum discharge capacity of the alloy electrodes monotonically decreases from 336.1 mAh/g (x = 0) to 281.2 mAh/g (x = 0.4). High-rate dischargeability of the alloy electrodes first increases with increasing x from 0 to 0.20, and then decreases when x increases to 0.4. Cycling stability decreases with increasing x from 0 to 0.4.

Effects of Al on Cycling Stability of a New Rare-Earth Mg-Based Hydrogen Storage Alloy

2005 ◽  
Vol 475-479 ◽  
pp. 2457-2462 ◽  
Author(s):  
Y.F. Liu ◽  
H.G. Pan ◽  
Rui Li ◽  
Y.Q. Lei
Keyword(s):  
Rare Earth ◽  
Oxide Film ◽  
Hydrogen Storage ◽  
Cycling Stability ◽  
Type Structure ◽  
High Rate ◽  
Kinetic Properties ◽  
Hydrogen Storage Alloys ◽  
Al Content ◽  
Discharge Capacities

In order to improve the cycling stability of a new rare-earth Mg-based hydrogen storage alloys, La0.7Mg0.3Ni2.65-xMn0.1Co0.75Alx (x=0.0-0.4) alloys were prepared to investigate the structure and electrochemical properties of these alloys. XRD and Rietveld analyses reveal that the alloys consist of a (La,Mg)Ni3 phase with rhombohedral PuNi3-type structure and a LaNi5 phase with hexagonal CaCu5-type structure. Electrochemical studies on these alloys indicate that their maximum discharge capacities were decreased from 400.7 mAh/g (x=0.0) to 335.6 mAh/g (x=0.4). However, the cycling stability of the alloy electrodes was significantly improved after Ni was partially replaced by Al. After 100 charge/discharge cycles, the discharge capacity retention was increased from 32.0% (x=0.0) to 73.8 % (x=0.3), which can be attributed to the formation of a dense oxide film on the alloy surface. Moreover, the high rate dischargeability measurements indicate that the electrochemical kinetic properties were deteriorated with increasing Al content owing to the presence of a dense oxide film of Al.

Hydrogen Storage Properties of Mg1.7 M0.3 Ni(M=Mg, La, Ce, Nd) Hydrogen Storage Alloys

2012 ◽  
Vol 512-515 ◽  
pp. 1503-1508 ◽  
Author(s):  
Yun Long Li ◽  
Ping Li ◽  
Fu Qiang Zhai ◽  
Wei Na Zhang ◽  
Xuan Hui Qu
Keyword(s):  
Hydrogen Storage ◽  
Vacuum Induction Melting ◽  
Kinetic Properties ◽  
Induction Melting ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
Helium Atmosphere ◽  
Hydrogen Storage Properties ◽  
Storage Properties ◽  
Activation Behavior

Mg1.7 M0.3 Ni (M = Mg, La, Nd and Ce) alloys were prepared by vacuum induction melting under the high purity helium atmosphere. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized to study the phase structures of tested alloys, and their morphologies and hydrogen storage properties were intensively studied by pressure-composition -temperature (PCT) test. It was found that the Mg-M-Ni(M=Mg, La, Nd and Ce)alloys appeared multiphase structures, and as Nd substituting Mg the Mg-Nd-Ni obtained the optimal activation behavior, plateau characteristics, hydrogen cycling reversibility and kinetic properties.

High Active Hydrogen Storage Alloy Mg2NiH4 and Mg2Ni Synthesized at Temperatures Lower than 733 K

2005 ◽  
Vol 488-489 ◽  
pp. 901-904 ◽  
Author(s):  
Xiao Feng Liu ◽  
Li Quan Li
Keyword(s):  
Low Temperature ◽  
Hydrogen Storage ◽  
Hydrogen Storage Alloy ◽  
Activation Process ◽  
Active Hydrogen ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
X Ray ◽  
Production Of Hydrogen ◽  
Temperature And Pressure

Hydrogen storage alloys Mg2Ni and Mg2NiH4 were synthesized at below 733 K by the process HCS. The product was examined by X-Ray diffraction and hydriding / dehydriding dynamics was tested. The result reveals that (1) High pure products of Mg2Ni and Mg2NiH4 can be obtained even at temperature 673 K and 0.1 MPa argon and 1.0 MPa hydrogen, respectively; (2) Both products are high active absorbing hydrogen > 3.2 mass % at 603 K without activation process. The result is very attractive due to the low temperature and pressure for the production of hydrogen storage alloys.

scholarly journals In situ X-ray Diffraction Investigation of Hydrogen Storage Alloys During Charge and Discharge

2016 ◽  
Vol 1 (4) ◽  
pp. 710-714
Author(s):  
Waldemir J. Paschoalino ◽  
Stephen J. Thompson ◽  
David Inwood ◽  
Claire Murray ◽  
Chiu C. Tang ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
X Ray Diffraction ◽  
Hydrogen Storage Alloys ◽  
X Ray

High-Temperature Characteristics of Melt-Spun Hydrogen Storage Alloys

2005 ◽  
Vol 475-479 ◽  
pp. 2505-2508
Author(s):  
Rong Li ◽  
Jianmin Wu ◽  
Yan Qi ◽  
Shaoxiong Zhou
Keyword(s):  
High Temperature ◽  
Hydrogen Storage ◽  
Hydrogen Evolution ◽  
Discharge Capacity ◽  
Hydrogen Storage Alloys ◽  
Temperature Characteristics ◽  
Hydride Formation ◽  
Melt Spun ◽  
Electrochemical Capacity ◽  
Melt Spun Ribbons

In this work, the electrochemical discharge capacity of melt-spun (MmY)1 (NiCoMnAl)5 ribbons, in which the content of yttrium was 0-2.5wt%, was studied in the temperature range of 30~80oC. It was found that adding element yttrium made the electrochemical capacity of the compounds increased. The capacity obtained was 333mAh/g at 30 oC and 247 mAh/g at 80oC when the content of yttrium was 2.0wt%. In addition, 70~85% recovery of the capacity was obtained due to better antioxidation. The increase of charging/discharging efficiency with yttrium substitution for Mm in melt-spun ribbons illustrated by the potential characteristics of charging/discharging is ascribed to the flatter and lower hydride formation potential, as well as the higher hydrogen evolution potential. Moreover, This effect is more prominent with increasing yttrium content.

Development of Thermodynamic Database of Ti-V-Based Hydrogen Storage Alloys

2013 ◽  
Vol 749 ◽  
pp. 577-582
Author(s):  
Jiang Wang ◽  
Mao Hua Rong ◽  
Cheng Ying Tang ◽  
Guang Hui Rao ◽  
Huai Ying Zhou
Keyword(s):  
Hydrogen Storage ◽  
Phase Diagram Data ◽  
Ternary Systems ◽  
Thermodynamic Database ◽  
Hydrogen Storage Alloys ◽  
High Hydrogen ◽  
Gibbs Energies ◽  
Component Systems ◽  
Storage Properties ◽  
Multi Component System

In this work,Ti-V-based hydrogen storage alloys have been studied because of their high hydrogen absorption/desorption capacities and good activated properties. Experimental data of phase equlibria and thermodynamic assessments of the sub-binary/ternary systems in the Ti-V-based multi-component systems are reviewed in reported literature. Based on the measured phase diagram data and thermochemica information, thermodynamic parameters formulating the Gibbs energies of various phases in some sub-binary/ternary systems of Ti-V-based multi-component alloys are assessed using the CALPHAD method. A set-consistent thermodynamic database of the Ti-V-based multi-component system is developed, which is helpful to study the relations between alloy compositions, microstructure and hydrogen storage properties in order to design novel Ti-V-based hydrogen storage alloys.

Electrochemical Hydrogen Storage Characteristics of (Mg1-XZrX)2Ni (x = 0 - 0.3) Alloys Prepared by Mechanical Alloying

2011 ◽  
Vol 291-294 ◽  
pp. 29-33 ◽  
Author(s):  
Yang Huan Zhang ◽  
Zhong Hui Hou ◽  
Shi Hai Guo ◽  
Guo Fang Zhang ◽  
Xia Li ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Discharge Capacity ◽  
Electrochemical Measurement ◽  
Discharge Voltage ◽  
Electrochemical Performances ◽  
Cycle Stability ◽  
Electrochemical Hydrogen Storage ◽  
Milling Duration ◽  
Storage Characteristics

The electrode alloys (Mg1-xZrx)2Ni (x = 0, 0.3) were prepared by mechanical alloying (MA). Mg in the alloy was partially substituted by Zr in order to improve the electrochemical hydrogen storage characteristics of the Mg2Ni-type alloy. The effects of substituting Mg with Zr as well as milling duration on the microstructures and electrochemical performances of the alloys were investigated in detail. The results showed that the substitution of Zr facilitates the formation of amorphous Mg2Ni-type phase. The electrochemical measurement indicated that the substitution of Zr significantly enhances the discharge capacity and cycle stability of the alloys, and it markedly improved the discharge potential characteristic of the alloys. For a fixed alloy, the electrochemical performances, including the cycle stability and the discharge voltage characteristic as well as discharge capacity, of the alloys were markedly improved with prolonging of the ball-milling duration.

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