A yttrium-nickel rare earth hydrogen storage alloy and a secondary battery containing the hydrogen storage alloy

A hydrogen storage alloy and secondary battery technology, applied in battery electrodes, alkaline battery electrodes, circuits, etc., can solve the problems of difficult control of alloy composition, potential safety hazards, and increased manufacturing difficulty, and achieve the elimination of alloy structural stress and Component segregation, improving electrical and thermal conductivity, improving hydrogen absorption and cycle life

Active Publication Date: 2017-05-03
BAOTOU RES INST OF RARE EARTHS +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent alloy composition does not contain Y element, but must contain Mg element. Due to the high vapor pressure of the active metal element magnesium, it is difficult to manufacture and the alloy composition is difficult to control. At the same time, the volatilized fine magnesium powder is flammable and explosive, which is safe Hidden danger

Method used

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  • A yttrium-nickel rare earth hydrogen storage alloy and a secondary battery containing the hydrogen storage alloy
  • A yttrium-nickel rare earth hydrogen storage alloy and a secondary battery containing the hydrogen storage alloy
  • A yttrium-nickel rare earth hydrogen storage alloy and a secondary battery containing the hydrogen storage alloy

Examples

Experimental program
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Effect test

Embodiment 13

[0020] The alloys described in Example 13 and Example 14 were prepared using the same ratio of raw materials. The alloy described in Example 13 is prepared by the aforementioned high-temperature smelting-quick quenching method. The process is as follows: the purity of each elemental metal or intermediate alloy raw material in the composition is >99.0%, and the ratio of each raw material is calculated according to the chemical molecular formula and accurately weighed ( Raw materials that are easy to burn need to increase the ratio in an appropriate amount), put the raw materials into Al 2 o 3 The crucible is evacuated to 3.0Pa and filled with inert gas Ar to 0.055MPa. Heat up and melt, keep warm for about 6 minutes and then quickly solidify. The speed of the quick-setting copper roller is 3.4m / s. The copper roller is usually fed with cooling water, and the temperature of the cooling water is 25°C.

Embodiment 14

[0021] The alloy described in Example 14 can also be prepared by high-temperature smelting-quick quenching method, and an annealing heat treatment step is added in the process, specifically: the purity of each elemental metal or intermediate alloy raw material in the composition is >99.0%, and the proportion is calculated according to the chemical molecular formula Calculate and accurately weigh each raw material (the proportion of easy-to-burn raw materials needs to be increased in an appropriate amount), and put the raw materials into Al 2 o 3 The crucible is evacuated to 3.0Pa and filled with inert gas Ar to 0.055MPa. Heat up and melt, keep warm for about 6 minutes and then quickly solidify. The speed of the quick-setting copper roller is 3.4m / s. The copper roller is usually fed with cooling water, and the temperature of the cooling water is 25°C. The quick-setting alloy flakes were annealed and heat-treated at 750°C for 8 hours under the protection of vacuum or inert ga...

Embodiment 20

[0022] M1 in Example 20 is a lanthanum-rich mixed rare earth metal, which contains about 64% of La, about 25% of Ce, about 3% of Pr, and about 8% of Nd.

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Abstract

A yttrium-nickel rare earth hydrogen storage alloy and a secondary battery containing the hydrogen storage alloy of the present invention relate to an AB3 type RExYyNiz-a-bMnaAlb hydrogen storage electrode alloy. The alloy has good activation performance, rate discharge capability, cycle stability of charging and discharging or hydrogen absorption and desorption, can be used in a wide temperature range, has small self-discharge, and its maximum electrochemical capacity can reach more than 360mAh·g-1 . The electrochemical performance of the alloy as a hydrogen storage electrode and the gas-phase hydrogen absorption and desorption performance as a hydrogen storage material are superior to those of the traditional LaNi5 type hydrogen storage alloy. In comparison, the fabrication method is simple and safe.

Description

technical field [0001] The present invention relates to an AB 3 Type RE-Y-NiMnAl 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 3-4 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 electrochem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C19/03H01M4/38H01M4/24
CPCY02E60/10
Inventor 闫慧忠李宝犬熊玮王利李金
Owner BAOTOU RES INST OF RARE EARTHS
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