Hydrogen-bearing rare-earth alloy as electrode and its quenching process

Abstract

A hydrogen-bearing rare-earth alloy as electrode has the chemical formula A1-yByCxm, where A is chosen from La, La-enriched mixed rare earth, Ce, etc, B is chosen from Mg, Ca, Be, etc, and C is chosen from Mn, Fe, Mo, etc. Its quenching process includes heating it to a certain temp in high-vacuum condition, keeping the temp for several hr, and quenching in oil or water. Its advantages include uniform internal structure, high capacity and long cycle life.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a novel rare-earth hydrogen storage electrode alloy for a negative electrode material of a nickel-metal hydride (Ni-MH) secondary battery and a quenching treatment method thereof. Background technique [0002] In recent years, compared with Ni-Cd secondary batteries, nickel-metal hydride (Ni-MH) secondary batteries have high capacity, long cycle life, no memory effect, strong anti-overcharge and over-discharge capabilities and No environmental pollution and other advantages have become the focus of many scholars at home and abroad. [0003] The positive electrode of the nickel-metal hydride secondary battery generally uses a nickel electrode, while the negative electrode material uses a hydrogen storage alloy. Theoretically speaking, hydrogen storage electrode alloys that can be used as anode materials for Ni-MH secondary batteries include rare earth-based AB 5 Ty...

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Problems solved by technology

However, the rare earth base AB 5 The capacity of the hydrogen storage electrode alloy is limited, and as the research on the hydrogen storage electrode alloy matures, its capacity is gradually approaching its theoretical electrochemical capacity, and it is becoming more and more difficult to meet people's needs for high energy density batteries.

[0004] In the study of high-capacity hydrogen storage electrode alloys, AB 2 The type Laves phase alloy has attracted people's attention due to its high capacity and long cycle life, but the initial activation of the alloy is quite difficult, and the large current discharge capacity is not ideal, so it is difficult to be practical

The initial electrochemical discharge capacity of magnesium-based alloys and vanadium-based solid solution alloys is quite high, but due to their rapid cycle degradation in the electrolyte, the capacity drops rapidly. Realize practicality

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