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Magnesium-based composite hydrogen storage material and preparation method thereof

A technology of hydrogen storage materials and alloys, which is applied in the direction of electrical components, circuits, battery electrodes, etc., can solve problems such as the existence of the preparation process, poor kinetics and corrosion resistance, and potential safety hazards, so as to reduce oxidation, ensure accuracy, and alloy composition Accurate and even effect

Inactive Publication Date: 2016-11-09
XIAMEN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

But currently Mg 2 The problems of poor kinetics and corrosion resistance of Ni alloys used as anode materials for nickel-metal hydride batteries have not been fundamentally resolved.
[0004] Chinese invention patent CN 103855371 B discloses a magnesium-based hydrogen storage electrode alloy hydride, the chemical formula is Mg 3-x-y mn x Ni y h m (0.2 ≤ x ≤ 0.8; 0.6 ≤ y ≤ 1.2; 0.7 ≤ m ≤ 4.4); the hydride is composed of Mg 2 NeH 4 , MnNi, Mn, MgNi 2 or MgH 2 Any one or several of several phases, and Mg 3 MnNi 2 Hn(0.8 ≤ n ≤3.4), the sintering process is to heat up to 500-600°C for 2-10h in a hydrogen atmosphere, and then cool down to 320-360°C for 1-2h. Since hydrogen is flammable and explosive, the There are potential safety hazards in the preparation process of materials

Method used

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  • Magnesium-based composite hydrogen storage material and preparation method thereof
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  • Magnesium-based composite hydrogen storage material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Preparation of magnesium-based composite hydrogen storage materials, the process is as follows figure 1 , the MgH 2 , Ni and Mn are mixed according to the ratio of 20:7:3 (molar ratio), using a planetary ball mill, the speed of the ball mill is set to 100 rpm, and the powder is mixed under the protection of high-purity argon, and the time of mixing is set For 5 hours, mixed powder B was obtained;

[0041] The mixed powder B is pressed into shape by using a stainless steel mold, and the pressing pressure is 60-120MPa to obtain the blank C;

[0042] Put the blank C into a vacuum tube furnace for sintering, pass high-purity Ar as a protective gas, and use a fluid atmosphere to make the MgH 2 The hydrogen gas released by decomposition is discharged. The sintering temperature is 500° C., and the sintering time is 8 hours. Finally, the sample is taken out and crushed mechanically, and ball milled on a planetary ball mill to obtain a powder sample (a), the chemical composi...

Embodiment 2

[0044] According to the method in Example 1, replace Mn with Nb and Zr, obtain powder samples (b) and (c) respectively, the chemical composition is Mg respectively 2 Ni 0.7 Nb 0.3 , Mg 2 Ni 0.7 Zr 0.3 . The specific preparation method is different from Example 1 in that when preparing the powder sample (b), the rotational speed of the ball mill is set to 200 rpm, and the mixing time is set to 3 hours; the sintering temperature is 480°C, and the sintering time is 10 Hour. When preparing the powder sample (c), the speed of the ball mill was set at 300 rpm, and the mixing time was set at 4 hours; the sintering temperature was 580°C, and the sintering time was 5 hours.

[0045] Sample (a) in Example 1 and samples (b) and (c) in Example 2 were subjected to XRD analysis test, and the XRD test analysis results were as follows figure 2 .

[0046] From figure 2 It can be seen that the intermetallic compound phase Mg with a face-centered cubic structure (FCC structure) is for...

Embodiment 3

[0048] Prepare Mg according to the method in embodiment 1 2 Ni 0.7 Nb 0.2 mn 0.1 with Mg 2 Ni, wherein the specific preparation method is different from Example 1 in that the preparation of Mg 2 Ni 0.7 Nb 0.2 mn 0.1 When, the MgH 2 , Ni, Nb and Mn are mixed according to the ratio of 20:7:2:1 (molar ratio) to prepare Mg 2 For Ni, put MgH 2 , Ni mixed according to the ratio of 2:1 (molar ratio).

[0049] The sample (a) in embodiment 1, the sample (b) in embodiment 2, (c) and the Mg prepared by this embodiment 2 Ni 0.7 Nb 0.2 mn 0.1 , Mg 2 Ni samples were fabricated into electrodes respectively. The specific production method is as follows:

[0050] (1) Weigh 2g powder sample, and mix 30wt.% high-purity nickel powder as a conductive agent, add an appropriate amount of binder PTFE, and fully grind it evenly in an agate bowl;

[0051] (2) Apply the uniformly mixed powder sample in (1) to the front and back sides of a 1cm×1cm foam nickel sheet;

[0052] (3) Wrap th...

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Abstract

The invention relates to a magnesium-based composite hydrogen storage material. The magnesium-based composite hydrogen storage material is composed of Mg, Ni and Tm, wherein Tm is any one or two of Mn, Zr, Nb, Al and Ti; and the chemical components of the magnesium-based composite hydrogen storage material can be represented as Mg2Ni(1-x)Tmx, and x is larger than 0 and smaller than or equal to 0.3. According to the magnesium-based composite hydrogen storage material, Mg2Ni serves as the main phase, an intermetallic compound Mg3TmNi2 of a cubic structure is grown in the Mg2Ni matrix phase in situ, Mg accounting for 4-6% of the total weight is dispersed in alloy, Mg is firstly corroded and oxidized in a strong-basicity electrolyte to form dense Mg(OH)2 which covers the surface of the alloy, and corrosion of Mg2Ni is effectively lowered. The magnesium-based composite hydrogen storage material has good hydrogen absorption / desorption performance and strong base corrosion resistance, and has good application prospects in the aspects of a hydrogen storage device and a high-capacity nickel-hydrogen secondary battery. A preparation method of the magnesium-based composite hydrogen storage material is simple in process and low in requirement for equipment, and the economic cost is effectively reduced.

Description

technical field [0001] The invention relates to metal functional materials, in particular to a magnesium-based composite hydrogen storage material and a preparation method thereof. Background technique [0002] As the anode material of Ni-MH battery, hydrogen storage alloy is the key factor to determine the capacity and cycle performance of Ni-MH battery. Currently commercialized hydrogen storage alloys are mainly AB 5 type rare earth hydrogen storage alloys (such as LaNi 5 ) and AB 2 Type Laves phase hydrogen storage alloys (such as TiMn 2 ), their relatively low hydrogen storage capacity (<3wt.%) is difficult to meet the requirements of the development of new energy vehicles. LaNi 5 The actual capacity of the alloy electrode has reached 330-350 mAh / g, close to its theoretical capacity of 372 mAh / g, and it is very difficult to further increase the electrode capacity. It is considered to be a new generation of high-capacity hydrogen storage electrode alloys mainly A...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C23/00H01M4/38
CPCC22C1/0408C22C23/00H01M4/383Y02E60/10
Inventor 钟海长姜春海曹春燕朱君秋
Owner XIAMEN UNIV OF TECH
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