In-situ synthesis method of nano oxide catalyst coated hydrogen storage alloy composite

A technology of nano oxides and hydrogen storage alloys, which is applied in fuel cells, transportation and packaging, fuel cell additives, etc. It can solve the problems of hydrogen storage alloys being easily corroded, catalysts cannot be uniformly coated, and high-capacity batteries cannot be met. Problems, to achieve the effect of improving electrochemical cycle stability and kinetic performance, improving charge and discharge efficiency and high temperature discharge efficiency, and improving cycle stability and kinetic performance

Active Publication Date: 2018-07-06
INNER MONGOLIA UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

Currently, AB 5 Type mixed rare earth hydrogen storage alloy has been industrialized as the negative electrode material of nickel-metal hydride battery, but its capacity is low (the limit value is 372mAh / g), which cannot meet people's requirements for high-capacity batteries.
[0003] La-Mg-Ni type hydrogen storage alloy has the advantages of high discharge capacity and low cost, but this type of hydrogen storage alloy has disadvantages such as easy corrosion and poor cycle life, which has become a bottleneck for the practical application of this type of alloy.
In addition, for a small number of hydrogen storage alloy materials containing catalyst additives, because the catalyst is coated inside the alloy, or the catalyst is prone to agglomeration, it cannot be uniformly coated on the surface of the alloy, resulting in a decrease in the catalytic activity of the catalyst, which cannot meet the requirements.

Method used

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  • In-situ synthesis method of nano oxide catalyst coated hydrogen storage alloy composite
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  • In-situ synthesis method of nano oxide catalyst coated hydrogen storage alloy composite

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preparation example Construction

[0033] For the nano-oxide-coated hydrogen storage alloy composite material of the present invention, the present invention specifically provides a preparation method, such as figure 1 shown, including the following steps:

[0034] S101: According to the chemical composition La 1-x-y RE x Mg y Ni 3.5-a-b m 1a M2 b The batching is carried out, followed by smelting, and the cast alloy ingot is obtained and crushed to obtain hydrogen storage alloy powder. specifically:

[0035] First, according to the chemical composition La 1-x-y RE x Mg y Ni 3.5-a-b m 1a M2 b Dosing; wherein, x, y, a and b are atomic ratios, 01 and M 2 Indicates the main group and transition metal elements, including Ti, V, Mn, Fe, Co, Cu, Zn, Al, Si, etc.; magnesium and RE rare earth metals increase the amount of burning loss by mass ratio of 5% to 15% during the batching, all The purity of the metal raw material is higher than 99.7%.

[0036] Secondly, put the prepared metal raw materials in a m...

Embodiment 1

[0047] This embodiment provides a method for preparing a nano-oxide-coated hydrogen storage alloy composite material, which includes the following steps:

[0048] S101: First, metals with a purity higher than 99.7% are stoichiometrically La 0.6 PR 0.15 Mg 0.25 Ni 2.7 co 0.2 Si 0.1 Dosing; Rare earth metals and metal Mg increase the proportion of burning loss by 5% and 8% when proportioning. Secondly, after that, the intermediate frequency induction melting furnace is used for melting, and the conditions are: vacuumize to 4×10 -4 , filled with high-purity helium to 0.1MPa, and heated at 1300°C to ensure that the metal is fully melted; the molten alloy was cast into a water-cooled copper mold under a protective gas, and cooled to room temperature with the furnace to obtain an as-cast alloy ingot. Thirdly, the prepared as-cast alloy ingot is ground with a grinding wheel to remove the surface oxide layer, and then mechanically crushed into a powder with a particle size of le...

Embodiment 2

[0059] This embodiment provides a method for preparing a nano-oxide-coated hydrogen storage alloy composite material, which includes the following steps:

[0060] S101: First, metals with a purity higher than 99.7% are stoichiometrically La 0.6 PR 0.15 Mg 0.25 Ni 2.7 co 0.2 Si 0.1 Dosing; Rare earth metals and metal Mg increase the proportion of burning loss by 5% and 8% when proportioning. Secondly, after that, the intermediate frequency induction melting furnace is used for melting, and the conditions are: vacuumize to 4×10 -4, filled with high-purity helium to 0.1MPa, and heated at 1300°C to ensure that the metal is fully melted; the molten alloy was cast into a water-cooled copper mold under a protective gas, and cooled to room temperature with the furnace to obtain an as-cast alloy ingot. Thirdly, the prepared as-cast alloy ingot is ground with a grinding wheel to remove the surface oxide layer, and then mechanically crushed into a powder with a particle size of les...

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Abstract

The invention relates to an in-situ synthesis method of a nano oxide catalyst coated hydrogen storage alloy composite. In the nano oxide catalyst coated hydrogen storage alloy composite, an Lal-x-yRExMgyNi3.0-a-bM1aM2b hydrogen storage alloy is selected in the hydrogen storage alloy, rare earth oxide and / or transition metal oxide are / is selected in the nano oxide catalyst, x, y, a and b are atomicratios, x is larger than 0 and smaller than 0.2, y is larger than 0 and smaller than 0.6, and a+b are smaller than 1. According to the raw material composition and the preparing method, the catalystsynthesis and the coating process are carried out at the same time, the catalyst is evenly and stably coated on the alloy surface in a nano thin layer manner, at the same time, the catalyst precursorenvironment can carry out surface treatment on the alloy, the circular stability and dynamics properties of the hydrogen storage composite are obviously improved, and the high-capacity battery needs are met.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials, in particular to an in-situ synthesis method of a nano-oxide catalyst-coated hydrogen storage alloy composite material. Background technique [0002] In recent years, based on the safe and efficient characteristics of hydrogen storage alloys in hydrogen storage, they are considered to be the hope of future green energy materials. The application fields of hydrogen storage alloys mainly include the hydrogen fuel carrier of fuel cells and the anode materials of nickel-metal hydride batteries. Currently, AB 5 The type mixed rare earth hydrogen storage alloy has been industrialized as the negative electrode material of nickel-metal hydride battery, but its capacity is low (the limit value is 372mAh / g), which cannot meet people's requirements for high-capacity batteries. [0003] La-Mg-Ni type hydrogen storage alloy has the advantages of high discharge capacity and low cost, but t...

Claims

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Application Information

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IPC IPC(8): B22F1/02H01M4/36H01M4/38H01M4/62H01M10/30H01M8/04082
CPCH01M4/366H01M4/383H01M4/62H01M8/04216H01M10/30B22F1/16Y02E60/50Y02E60/10
Inventor 张国芳侯忠辉许剑轶胡锋翟亭亭张羊换
Owner INNER MONGOLIA UNIV OF SCI & TECH
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