Characterization of AB5-Type Metal Hydride Modified by Electroless Plating Nickel

2012 ◽  
Vol 557-559 ◽  
pp. 1988-1988
Author(s):  
Wu Tsan Wu ◽  
Jing Shan Do
Keyword(s):  
Reaction Time ◽  
Electroless Plating ◽  
Metal Hydride ◽  
Alloy Powder ◽  
Negative Electrode ◽  
Complex Agent ◽  
Cr Concentration ◽  
Mh Battery ◽  
Charge Discharge

The charge/discharge properties of commercial metal hydride alloy powder (MmNi3.81Mn0.41Al0.19Co0.76) is improved and modified by electroless plating nickel. The effect of concentration of reducing agent (Cr), concentration of complex agent (Cc), reaction temperature (T), reaction time (t), and the amounts of MH powder per volume (CMH) on the utilization of the modified MH alloy used as the negative electrode of Ni/MH battery is systematically studied. The utilization of modified MH alloy is mainly affected by Cr, Cc and t. The utilizations of MH alloys modified with condtions of T = 70 oC, t = 90 min, Cr = 20 g l-1, Cc = 20 g l-1 and CMH = 20 g l-1, respectively, are obtained to be 92.3, 64.7 and 23.6% at discharging rate of 1, 4, and 10 C. The utilizations of modified MH alloy are increased by 15.5, 45.6 and 19.8% compared with the pristine MH alloy for discharging rates of 1, 4 and 10 C, respectively.

scholarly journals Development of a Liquid Immersion-Type Nickel-Metal Hydride Battery Under High-Pressure

2021 ◽  
Author(s):  
Kouji Maeda ◽  
Shinji Yae ◽  
Naoki Fukumuro ◽  
Kenji Iimura ◽  
Ayumu Matsumoto
Keyword(s):  
High Pressure ◽  
Metal Hydride ◽  
High Pressures ◽  
Negative Electrode ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Electric Capacity ◽  
Discharge Cycle ◽  
Mh Battery ◽  
Charge Discharge

Abstract A nickel-metal hydride (Ni–MH) prototype battery completely immersed in an aqueous electrolyte solution of KOH under high pressure was fabricated to examine the effects of high pressure on the quality of Ni–MH batteries. The small battery cell comprised positive and negative electrode materials, as used in electric vehicles, and an Ag/AgO reference electrode. The electric capacity of the Ni–MH battery was measured at different temperatures and pressures with small currents and charge/discharge voltages of 1.6 – 1.0 V. High pressures were found to clearly and effectively enhance the electric capacity of the Ni–MH battery at larger currents. The considerable effect of high pressure on the Ni–MH battery was elucidated by the change in internal resistance during the charge/discharge cycle life experiment, indicating that the voltage of the positive electrode did not appreciably change at a high pressure compared to that of the negative electrode. Moreover, the use of large currents in rapid charge/discharge cycle tests at high pressures of up to 30 MPa resulted in charge/discharge cycles that were five times faster and a quick recovery of capacity was achieved in the 0.5 – 2.1 V range.

Characterization of AB5-Type Metal Hydride Modified by Electroless Plating Nickel in Forming Process

2011 ◽  
Vol 306-307 ◽  
pp. 139-142 ◽  
Author(s):  
Wu Tsan Wu ◽  
Jing Shan Do
Keyword(s):  
Reaction Time ◽  
Metal Hydride ◽  
Negative Electrode ◽  
Electroless Nickel ◽  
Electroless Nickel Plating ◽  
Nickel Plating ◽  
Forming Process ◽  
Electroactive Material ◽  
Complex Agent ◽  
Loading Amount

Metal hydride (MH) alloy (MmNi3.81Mn0.41Al0.19Co0.76) is modified by the electroless nickel plating and used as the electroactive material of negative electrode in Ni/MH batteries. The effect of the concentrations of reductant (NaH2PO2×H2O), complex agent (Na3C6H5O7×2H2O), reaction time, and reaction temperature on the Ni loadings and the utilization of the modified MH are systematically studied. The experimental results reveal that the appropriate reaction time and temperature of electroless nickel plating are 30 min and 70 °C in this work. The loading amount of Ni-P on MH alloy is increased and decreased by increasing the concentration of reductant and complex agent, respectively. The steady utilization of unmodified MH alloy is 94.7±1.0 % in the forming process under the charge/discharge conditions of 0.2C charge to 160% SOC (state of charge) and 0.2C discharge to 0.95V. The utilization of MH alloys modified with conditions of [NaH2PO2×H2O] = 40 g L-1 and [Na3C6H5O7×2H2O] = 20 g L-1, T = 70 °C, t = 30 min and [MH] = 2g/100 ml, respectively, is improved to 101.9±0.3 %.

Characterization of Metal Alloy Powder Materials for Metal-Hydride Anodes Using Thin-Layer Electrode Approach

2010 ◽  
Vol 157 (3) ◽  
pp. A254 ◽  
Author(s):  
P. Piela ◽  
Z. Rogulski ◽  
M. Krebs ◽  
E. Pytlik ◽  
M. Schmalz ◽  
...  
Keyword(s):  
Thin Layer ◽  
Metal Hydride ◽  
Alloy Powder ◽  
Metal Alloy ◽  
Powder Materials

Elaboration and characterization of magnesium-substituted La5Ni19 hydride forming alloys as active materials for negative electrode in Ni-MH battery

2009 ◽  
Vol 54 (6) ◽  
pp. 1710-1714 ◽  
Author(s):  
Amélie Férey ◽  
Fermin Cuevas ◽  
Michel Latroche ◽  
Bernard Knosp ◽  
Patrick Bernard
Keyword(s):  
Negative Electrode ◽  
Active Materials ◽  
Mh Battery

Hydrogenation and Discharge Capacity of a La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 Alloy for Nickel-Metal Hydride Batteries

2010 ◽  
Vol 660-661 ◽  
pp. 128-132
Author(s):  
Julio César Serafim Casini ◽  
Lia Maria Carlotti Zarpelon ◽  
Eliner Affonso Ferreira ◽  
Hidetoshi Takiishi ◽  
Rubens Nunes de Faria Jr.
Keyword(s):  
Discharge Capacity ◽  
Metal Hydride ◽  
High Pressures ◽  
Negative Electrode ◽  
X Ray Diffraction ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Negative Electrodes ◽  
The Mean

The preparation of negative electrodes for nickel-metal hydride (Ni-MH) batteries using a La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 alloy in the as-cast state has been carried out. The alloy was mechanically crushed (<44 m) and a battery was manufactured with this material. The mean discharge capacity achieved using this method was 384 mAh/g. Another two batteries were prepared using a hydrogen powdered La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 alloy at low and high pressures (2-10 bar). It has been shown that hydrogen powdering facilitates the activation of the negative electrode for Ni-MH batteries. This study also included the characterization of the hydrogenated and crushed powders. These materials were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

Elaboration and electrochemical characterization of LaZr2Cr4Ni5-based metal hydride alloys

Ionics ◽  
2016 ◽  
Vol 22 (10) ◽  
pp. 1973-1983 ◽  
Author(s):  
Ines Sahli ◽  
Ouassim Ghodbane ◽  
Mohieddine Abdellaoui
Keyword(s):  
Metal Hydride ◽  
Electrochemical Characterization ◽  
Metal Hydride Alloys

Surface Characterization of Cu−M (M = Ti, Zr, or Hf) Alloy Powder Catalysts

1998 ◽  
Vol 102 (46) ◽  
pp. 9258-9265 ◽  
Author(s):  
Árpád Molnár ◽  
Imre Bertóti ◽  
János Szépvölgyi ◽  
Gabriele Mulas ◽  
Giorgio Cocco
Keyword(s):  
Alloy Powder ◽  
Surface Characterization
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