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Non crystal state hydrogen storage composite material and its producing method

A composite material, manufacturing method technology, applied in chemical instruments and methods, fuel cells, other chemical processes, etc., to achieve the effect of increasing electrochemical hydrogen storage capacity

Inactive Publication Date: 2006-08-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogen storage composite material of the present invention is an amorphous hydrogen storage composite material formed by ball milling a binary or multi-component 1:12 metal compound crystalline rare earth-magnesium-based hydrogen storage alloy and nickel powder. It maintains the high hydrogen storage capacity of rare earth-magnesium-based alloys with the original crystalline structure, and overcomes the disadvantage that the original crystalline alloys cannot electrochemically absorb and desorb hydrogen at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A kind of amorphous hydrogen storage composite material, its general chemical formula is RE 1-x m x Mg 12-y N y +zNi, where RE is Ce, x=0, y=0, z is 0.75, that is, the weight of Ni powder is CeMg 12 75% by weight, according to the chemical formula CeMg 12 Calculate the weight ratio of Ce and Mg, Ce in the raw materials is metal cerium with a purity of 98%, Mg is metal magnesium with a purity of 99%, and then smelted in a vacuum induction furnace protected by argon to obtain crystalline CeMg 12 Alloy ingot, crush the alloy ingot into alloy powder less than 75μm, and put it in the ball tank of the ball mill, then add CeMg 12 75% of the nickel powder by weight is milled together with a ball with a ball-to-material ratio of 20:1. The particle size of the nickel powder is less than 75 μm. The spindle speed of the ball mill is 225 rpm. After continuous ball milling for 50 hours, a fine amorphous composite material can be obtained. The resulting composite material was mad...

Embodiment 2

[0014] Preferred chemical formula RE 1-x m x Mg 12-y N y In +zNi, RE is Ce, x=0.2, M is Ca, N is Ni, y=1, z is 1.5, which constitutes Ce 0.8 Ca 0.2 Mg 11 Ni+1.5Ni alloy. According to the chemical formula Ce 0.8 Ca 0.2 Mg 11 Ni calculates the weight proportion of Ce, Ca, Mg, Ni, and in the raw material, Ca is metallic calcium with a purity of 98%, Ni is electrolytic nickel with a purity of 99%, and the purity of other raw materials is the same as in Example 1. Smelted in the furnace to obtain crystalline Ce 0.8 Ca 0.2 Mg 11 Ni alloy ingot is then broken into alloy powder less than 75 μm, then ball milled together with 150% nickel powder whose weight is alloy powder, the nickel powder particle size is less than 75 μm, ball milling process is the same as embodiment 1, through 40 hours of continuous ball milling mixture is converted into Amorphous composite material, the measured discharge capacity is 1010mAh g (Ce 0.8 Ca 0.2 Mg 11 Ni) -1 . The electrochemical tes...

Embodiment 3

[0016] Preferred chemical formula RE 1-x m x Mg 12-y N y In +zNi, RE is Ce, x=0.2, M is Ca, N is Y, y=1, z=1.0, constitute Ce 0.8 Ca 0.2 Mg 11 Y+1.0Ni mixed material, according to the chemical formula Ce 0.8 Ca 0.2 Mg 11 Y calculates the weight proportion of Ce, Ca, Mg and Y, and Y is the metal yttrium of purity 99% in the raw material, and other raw material purity is with embodiment 2, and smelting and ball milling process are with embodiment 1, nickel powder weight and Ce 0.8 Ca 0.2 Mg 11 The Y weight ratio is 1.0, the ball milling time is 40 hours, and the discharge capacity of the prepared amorphous composite material is 1150mAh g (Ce 0.8 Ca 0.2 Mg 11 Ni) -1 . The electrochemical test method and parameters are the same as in Example 1.

[0017] Document [1]: Chinese Invention Patent CN 1044175C

[0018] Literature [2]: J.Alloys and Compounds, 1998 Vol.267, pp76-78

[0019]Literature [3]: J. Alloys and Compounds, 1998, Vol.270, pp142-144

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Abstract

The amorphous hydrogen storing composite material has the chemical expression of Re1-xMxMg12-yNy+zNi, where x is 0-5; y is 0-3; Re is one or several of RE metal Ce, La, Pr, Nd, Sm, rich-Ce RE Mm and rich-La mixed RE MI; M is one of the metal elements Ca, Ti, V and Zr capable of reacting with hydrogen to produce hydrolide; N is one of the transition elements Y, Ni, Co, Fe and Cr; and z as the Ni / Re1-xMxMg12-yNy weight ratio is 0.5-1.5. Compared with available hydrogen storing electrode alloy, the present invention has the outstanding advantages of electrochemical hydrogen storage at room temperature and capability of making electrode with very high discharge capacity, and is especially suitable for making Ni-H2 cell with high specific energy.

Description

Technical field: [0001] The invention relates to an alkaline secondary battery negative electrode active material mainly composed of magnesium, rare earth metal and nickel, in particular to an amorphous hydrogen storage composite material and a manufacturing method thereof. Background technique: [0002] Nickel-metal hydride (Ni / MH) battery is a high-capacity alkaline secondary battery with a hydrogen storage electrode alloy as the negative electrode active material, and has achieved large-scale industrialization so far. At present, the negative electrode active materials of almost all commercial nickel-metal hydride batteries use rare earth series AB 5 type hydrogen storage electrode alloys, they are all in the typical binary LaNi 5 Multi-element alloy developed on the basis of alloy. LaNi 5 The theoretical electrochemical capacity is 372mAh g -1 , while the commercially available utility AB 5 Type multi-element hydrogen storage electrode alloy discharge capacity is on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/04B01J20/02H01M8/22
CPCY02E60/50
Inventor 陈长聘陈立新陈昀王新华王启东
Owner ZHEJIANG UNIV