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Beijing Haoyun Industry Co., Ltd.
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 Click to enlarge image
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 Model Number |
PLG1 |
1. Brief Introduction
Taking advantage of the abundant rare-earths resource in China, with advanced equipments, technology and analysis instruments, we produce hydrogen storage alloys used as the key material of the high capacity, no pollution Metal Hydride/Nickel (MH/Ni) batteries in the production scale of 2000 tons per year. The technology of the products is ripe, the quality of the products is high and steady, and the registered trademark of the products is Polar Light.
There are many kinds of product specifications of hydrogen storage alloys in our company, and the suitable products can be offered according to the request of the users. The performance of the products of our company occupies the first place at home, and also comes out at the top in the world.
2. The Operation Principle
Hydrogen storage alloys are the materials that can reversibly absorb and desorb hydrogen in large quantities in certain temperatures and pressures. Hydrogen storage alloys are used as the negative electrodes of MH/Ni batteries, and so they are the key materials in MH/Ni batteries. The electrolyte of MH/Ni batteries is aqueous solution of potassium hydroxide. When MH/Ni batteries are charged, the hydrogen ions formed from the electrolytic water adsorb the surface of the negative electrode, then diffuse into the electrode matrix, react with hydrogen storage alloys and turn into metal hydrides, MHx. When the electric current is reversed and MH/Ni batteries are discharged, the metal hydrides release the absorbed hydrogen ions and oxidized into water as both the hydrogen storage alloys and metal hydrides are good electric conductors. The electrochemical reaction equation is in the below,
M + xNi(OH) 2→← MH x + xNiOOH
During the charge and discharge process, there is neither dissolve of the metals from the positive electrodes, nor the deposit of the metals on the negative electrodes. The reactions occurred on both the positive and negative electrodes belong to solid-phase transition mechanism, so both the electrodes are very stable in structure.
3. Performance of the Routine Products
(1) Chemical Composition
Chemical Composition
Specifications
PLL1
PLL3B
PLC1
Type of the Rare-earths
La-rich
La-rich
Ce-rich
Composition of the Impurities
Impurity
C
Fe
Si
Cl
Mg
O
N
Composition, wt. %
< 0.02
< 0.10
< 0.02
< 0.01
< 0.01
< 0.08
< 0.01
(2) Electrochemical Property ( 20±5°C)
a. Discharge Capacity: ≥300mAh/g alloy ( At 1C rate, charged for 1.5hr., discharged to the voltage of 1.0V. )
b. Cycle Life: ≥600 times ( At 1C rate, charged and discharged to 100%DOD. )
c. Discharge Property: The discharge capacity above the voltage of 1.2V accounts for 80% or more of the total discharge capacity at 1C charge/discharge rate.
d. Activity Property: The discharge capacity reaches 280 mAh/g or more in two charge/discharge cycles when activated at 0.2C rate.
e. Self Discharge: <25% ( 28days )
(3) PCT Diagram
The pressure plateaus of the hydrogen storage alloys are between 0.005MPa and 0.2MPa in the temperature range from ?40°C to 80°C. The overall hydrogen storage capacities are no less than 5.0 H/M, as shown in the figure.
(4) Particle Size Distribution
There are four specifications for particle size, -200 mesh, -180 mesh, -150 mesh and -120 mesh. The alloy powders of ?200 mesh and -180 mesh are suitable for the wet manufacturing technology of MH/Ni battery electrodes, and that of -150 mesh and -120 mesh are suitable for the dry manufacturing technology of MH/Ni battery electrodes. The particle size distribution of the alloy powders can be adjusted according to the demand of the users.
The curve of the particle size distribution of the -200 mesh alloy powders is shown in the figure.
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