Rare earth-yttrium-nickel family hydrogen storage alloy, and secondary battery containing hydrogen storage alloy

Abstract

The invention relates to a rare earth family hydrogen storage alloy with the general formula of RExYyNiz-a-b-cMnaAlbMc. The alloy treats the rare earth Y as one of main components, contains Mn and Al elements or one of Mn and Al, also contains one or more of Cu, Fe, Co, Sn, V and W, contains no alkali earth metals, and is simple and safe to produce. The hydrogen storage alloy has a good compression-composition-isothermal characteristic and a large hydrogen storage amount reaching above 1.28wt% under usual conditions; the highest capacity of the above hydrogen storage alloy electrode is higher than that of LaNi5 type hydrogen storage alloy; and the rare earth family hydrogen storage alloy has good activation performances, rate discharge ability, and charge and discharge or hydrogen absorption and desorption cycle stability, can be used in a wide temperature range, and has small self discharge.

Description

technical field [0001] The invention relates to a rare earth-yttrium-nickel hydrogen storage alloy. Background technique [0002] Hydrogen storage alloys are a class of functional materials with high hydrogen storage density discovered in the late 1960s. The existing hydrogen storage alloys can be roughly divided into six categories in terms of composition: rare earth series AB 5 type like LaNi 5 ; Magnesium series such as Mg 2 Ni, MgNi, La 2 Mg 17 ;Rare earth-magnesium-nickel system AB 3-3.5 type like La 2 MgNi 9 , La 5 Mg 2 Ni 23 , La 3 MgNi 14 ;Titanium-based AB type such as TiNi, TiFe; zirconium, titanium-based Laves phase AB 2 Type such as ZrNi 2 ; Vanadium series solid solution type such as (V 0.9 Ti 0.1 ) 1-x Fe x . [0003] The widely used hydrogen storage material is LaNi 5 type hydrogen storage alloy. The alloy is mainly used as the negative electrode material of metal hydride-nickel secondary battery (MH / Ni), and its theoretical electrochemical...

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Problems solved by technology

The alloy composition of this patent must contain magnesium element. Due to the high vapor pressure of the active metal element magnesium, the manufacturing difficulty is increased and the alloy composition is difficult to control. At the same time, the volatilized fine magnesium powder is flammable and explosive, which poses a safety hazard.

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