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).

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.

The Effect of High Charging Rates Activation on the Specific Discharge Capacity and Efficiency of a Negative Electrode Based on a LaMgAlMnCoNi Alloy

2010 ◽  
Vol 660-661 ◽  
pp. 133-138 ◽  
Author(s):  
Eliner Affonso Ferreira ◽  
Lia Maria Carlotti Zarpelon ◽  
Julio César Serafim Casini ◽  
Hidetoshi Takiishi ◽  
Rubens Nunes de Faria Jr.
Keyword(s):  
Discharge Capacity ◽  
Negative Electrode ◽  
Rechargeable Battery ◽  
X Ray Diffraction ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
X Ray ◽  
Charging Rate ◽  
Specific Discharge ◽  
Scanning Electron

A nickel-metal hydride (Ni-MH) rechargeable battery has been prepared using a La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 alloy as the negative electrode. The maximum discharge capacity of the La0.7Mg0.3Al0.3Mn0.4Co0.5Ni3.8 alloy has been determined (350 mAh/g). Using a high starting charging rate (2857 mAg-1) an efficiency of 49% has been achieved in the 4th cycle. The alloy and powders have been characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD).

Characterization of spent nickel–metal hydride batteries and a preliminary economic evaluation of the recovery processes

2015 ◽  
Vol 66 (3) ◽  
pp. 296-306 ◽  
Author(s):  
Sheng-Lun Lin ◽  
Kuo-Lin Huang ◽  
I-Ching Wang ◽  
I-Cheng Chou ◽  
Yi-Ming Kuo ◽  
...  
Keyword(s):  
Economic Evaluation ◽  
Metal Hydride ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Recovery Processes
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