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Fused salt electrosynthesis method of hydrogen storage alloy containing magnesium, lithium, sodium and potassium

A technology of hydrogen storage alloy and electrosynthesis, which is applied in the field of preparation of AB3 type hydrogen storage alloy, can solve the problem that there is no technical report on adding sodium and potassium to hydrogen storage alloy, and there is no report on the addition of magnesium, lithium, and sodium to electrosynthesis. and potassium issues

Active Publication Date: 2010-12-15
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] In summary, in the prior art, magnesium, lithium, sodium and potassium are added to hydrogen storage alloys. Except for the technical reports of using high-energy ball mills for mechanical alloying to add lithium and induction smelting to add magnesium, there is no complete addition of sodium. and potassium into hydrogen storage alloys, and there is no report on the addition of magnesium, lithium, sodium and potassium by electrosynthesis

Method used

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  • Fused salt electrosynthesis method of hydrogen storage alloy containing magnesium, lithium, sodium and potassium
  • Fused salt electrosynthesis method of hydrogen storage alloy containing magnesium, lithium, sodium and potassium
  • Fused salt electrosynthesis method of hydrogen storage alloy containing magnesium, lithium, sodium and potassium

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Embodiment 1

[0057] In MmNi 24.5 Al 51.5 Electrosynthesis of AB by Molten Salt Electrosynthesis Added Magnesium and Lithium to Hydrogen Storage Alloy 3 Type hydrogen storage alloy method, the step, condition and operating method of its electrosynthesis method are:

[0058] Step 1: Miscible Molten Salt Electrolyte:

[0059] (1) The formula of the four mixed salt components of the molten salt electrolyte is: 50wt.% KCl-50wt.% NaCl, the meaning of this expression is: the mixed salt in KCl·NaCl binary mixed salt is composed of 50wt.% The first component KCl is mixed with 50wt.% of the second component NaCl by equal weight, and the sum of the two weight percentages is 100%;

[0060] The second group: 60wt.% KCl-40wt.% MgCl 2 , the meaning of the expression is: KCl MgCl 2 Binary mixed salt is based on 60wt.% of the first component KCl and 40wt.% of the second component MgCl 2 The ratio of weight percentage is mixed, and the sum of the two weight percentages is 100%;

[0061] The third gro...

Embodiment 2

[0091] The difference from Example 1 is: 1. the time of electroosmosis Li is shortened to 1 / 60 of that of Example 1; the electrolysis time of adding Mg, Na and K to electrolysis increases by 4 times that of Example 1; 2. the temperature of electroosmosis Li 450℃; electroosmotic Li cathode current density is 0.20A / cm 2 ;; ③ The electrolysis temperature of electrolysis plus Mg, Na and K is 750°C; the cathode current density of the electrolysis is 22A / cm 2 ; ④ Li in the electrosynthesized alloy accounts for 0.057wt.% by weight; K and Na account for 84ppm and 126ppm in the electrosynthesized alloy; ⑤ Li direct yield is 76%; The cathodic current efficiency is 65%; 6. The cathodic current efficiency of electrolysis plus Mg, Na and K is 70%; the direct recovery rate of Mg is 87%; Induction heating for 2 minutes; ⑧After induction heating, K and Na in the electrosynthesized alloy were reduced from 84ppm and 126ppm to 5ppm and 7ppm; ⑨After induction heating, the chemical formula of the...

Embodiment 3

[0093] The difference from Example 1 is: 1. The composition of hydrogen storage alloy cathode powder is from the MmNi of Example 1 24.5 al 51.5 with MmNi 8.75 al 1.25 The time of electroosmosis Li is shortened to 1 / 3 of embodiment 1 relative to embodiment 1; The electrolysis time of electrolysis adding Mg, Na and K increases 1 times of embodiment 1; 2. the temperature of electroosmosis Li is 440 ℃; electroosmotic Li cathode current density is 0.25A / cm 2 ; ③ The electrolysis temperature of electrolysis plus Mg, Na and K is 735°C; the cathode current density of the electrolysis is 20A / cm 2 ,; ④ Li accounted for 0.66wt.% by weight in the electrosynthesized alloy; Na and K accounted for 240ppm and 189ppm by weight in the electrosynthesized alloy; ⑤ Li direct yield was 74.2%; The cathodic current efficiency of electrolysis is 63%; 6. the cathodic current efficiency of electrolysis adding Mg, Na and K is 59%; The direct recovery rate of Mg is 81%; Induction heating for post-pro...

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Abstract

The invention provides a fused salt electrosynthesis method of a hydrogen storage alloy containing magnesium, lithium, sodium and potassium, in particular to a preparation method of an electrosynthesis AB3 type hydrogen storage alloy containing magnesium, lithium, sodium and potassium, comprising a fused salt electroosmosis step and a fused salt electrolysis step which are used simultaneously. The hydrogen storage alloy containing MmNi4.2Al0.7 and the like are used as cathodes in KCl.LiCl fused salt electrolyte. The preparation method comprises the following steps of: carrying out Li electroosmosis on the cathodes, such as the hydrogen storage alloy and the like, at 420-450 DEG C; regulating the composition of the fused salt electrolyte to a quaternary mixed salt system of KCl.NaCl.LiCl.MgCl2, and also increasing the temperature; and carrying out limit electrolysis with the electrolytic cathode current density of 18-22 A / cm<2> to obtain the AB3 type hydrogen storage alloy containing magnesium, lithium, sodium and potassium. The fused salt electroosmosis step and the fused salt electrolysis step are closely linked; the Li electroosmosis is carried out at low current density, Mg is electrolyzed at high current density, and K and Na are added through compelling electrolysis so that in-situ electrodeposition is realized in a same electrolytic cell. The invention belongs to the field of a short-process touch process.

Description

technical field [0001] The invention relates to a molten salt electrosynthesis method in which magnesium, lithium, sodium and potassium are added to a hydrogen storage alloy. In particular, it relates to the electrosynthesis of AB containing magnesium, lithium, sodium and potassium comprising molten salt electroosmosis and electrolysis. 3 The preparation method of type hydrogen storage alloy. Background technique [0002] The addition of metal magnesium to hydrogen storage alloys is considered to have the dual advantages of increasing capacity and reducing costs. Magnesium-containing rare earth (RE)AB 2.2 -AB 5.2 type hydrogen storage alloys, especially where AB 3.0 -AB 3.8 Type hydrogen storage alloys have formed their own system in recent years and were newly named RE-Mg-Ni series hydrogen storage alloys by industry peers. During the preparation of this series of alloys, the main problems encountered at present are the technical problems of the safety and effectivene...

Claims

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Application Information

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IPC IPC(8): C22C1/04C25C3/02C25C3/04
Inventor 吴耀明王立民王立东张华喜董含武高云亮白永辉朱佳飞
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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