Effect of Ni Content on Rate Capability of Mg[sub 0.9]Ti[sub 0.06]V[sub 0.04]Ni[sub x] Negative Electrodes for Nickel/Metal Hydride Batteries

2004 ◽  
Vol 151 (7) ◽  
pp. A939 ◽  
Author(s):  
Hiroshi Inoue ◽  
Hiroshi Iden ◽  
Ryuji Shin-ya ◽  
Shinji Nohara ◽  
Chiaki Iwakura
Keyword(s):  
Metal Hydride ◽  
Rate Capability ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Ni Content ◽  
Negative Electrodes

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).

High Performance Zr-based Metal Hydride Alloys For Nickel Metal Hydride Batteries

1999 ◽  
Vol 575 ◽  
Author(s):  
R. C. Young ◽  
S. R. OVSHINSKY ◽  
B. HUANG ◽  
B S. CHAO ◽  
Y. LI
Keyword(s):  
Discharge Capacity ◽  
Metal Hydride ◽  
High Performance ◽  
Rate Capability ◽  
Site Occupancy ◽  
Surface States ◽  
Rechargeable Batteries ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Local Environments

ABSTRACTBased upon Ovonic's multi-element, atomic engineering approach, two families of alloys are being used in commercial Nickel Metal Hydride (NiMH) rechargeable batteries, i.e. the mischmetal (Mm) based AB5 and Zr based AB2 alloys. While Mm based alloys are faster to activate, are limited by a discharge capacity of only 320–340 mAh/g. The Zr based alloy, although slightly slower to activate, provides a much higher discharge capacity. In this paper, we first discuss the use of Ovonic's multi-element approach to generate a spectrum of disordered local environments. We then present experimental data to illustrate that through these atomically engineered local environments, we are able to control the hydrogen site occupancy, discharge capacity, kinetics, and surface states. The Zr based alloy with a specific discharge capacity of 465 mAh/g and excellent rate capability has been demonstrated.

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