Method for surface modification of AB3 type hydrogen storage alloy by means of graphene

A hydrogen storage alloy and surface modification technology, applied in the field of material chemistry and electrochemical research, to achieve the effect of enhanced corrosion resistance, good cycle performance, and simple operation

Active Publication Date: 2016-08-24
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because graphene has excellent thermal conductivity, good electron mobility, large specific surface area, and quantum Hall effect, it plays an importa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1:

[0012] (1) Press AB 3 Type hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 Weigh the metal powder with a purity of 99.9% by molar ratio, and prepare AB by vacuum induction melting under the protection of argon. 3 Type hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 , Pulverize it and pass a 200-mesh sieve to obtain La-Mg-Ni-based hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 .

[0013] (2) Add 10 g of graphite powder to 250 mL of H with a mass percentage concentration of 98% 2 SO 4 After stirring in an ice water bath for 30 minutes, add 40 g of potassium permanganate and continue stirring for 1 h; then move to a 40 ℃ water bath and continue to stir for 30 minutes, then add distilled water to dilute the mixture to 900 mL; add 50 mL H with a concentration of 30% by mass percentage 2 O 2 , Filtered while hot, and the filtrate was repeatedly washed with 5% by mass HCl and d...

Example Embodiment

[0016] Example 2:

[0017] (1) Press AB 3 Type hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 Weigh the metal powder with a purity of 99.9% by molar ratio, and prepare AB by vacuum induction melting method under the protection of argon. 3 Type hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 , Pulverize it and pass a 200-mesh sieve to obtain La-Mg-Ni-based hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 .

[0018] (2) Add 10 g of graphite powder to 275 mL of H with a mass percentage concentration of 98% 2 SO 4 After stirring in an ice water bath for 30 minutes, add 40 g of potassium permanganate and continue stirring for 1 h; then move to a 40 ℃ water bath and continue to stir for 30 minutes, then add distilled water to dilute the mixture to 900 mL; add 55 mL H with a concentration of 30% by mass percentage 2 O 2 , Filtered while hot, and the filtrate was repeatedly washed with 5% by mass HC...

Example Embodiment

[0021] Example 3:

[0022] (1) Press AB 3 Type hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 Weigh the metal powder with a purity of 99.9% by molar ratio, and prepare AB by vacuum induction melting under the protection of argon. 3 Type hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 , Pulverize it and pass a 200-mesh sieve to obtain La-Mg-Ni-based hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 Mn 0.10 Co 0.60 .

[0023] (2) Add 10 g of graphite powder to 300 mL of H with a mass percentage concentration of 98% 2 SO 4 After stirring in an ice water bath for 30 min, add 40 g of potassium permanganate and continue stirring for 1 h; then move to a 40 ℃ water bath and continue to stir for 30 min, then add distilled water to dilute the mixture to 900 mL; add 60 mL H with a concentration of 30% by mass percentage 2 O 2 , Filtered while hot, and the filtrate was repeatedly washed with 5% by mass HCl and deionized...

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Abstract

The invention discloses a method for surface modification of AB3 type hydrogen storage alloy by means of graphene. Metal powder with purity being 99% or more is weighed according to a target product molar ratio, AB3 type hydrogen storage alloy is prepared with the vacuum induction melting method under the protection of argon, and the AB3 type hydrogen storage alloy is pulverized and then screened with a 200-mesh screen to obtain an alloy product; graphene is prepared with the graphene oxide chemical reduction method, and graphene powder is obtained through filtration drying and grinding in sequence; 1-5% parts by mass of graphene powder is mixed with the alloy product and then subjected to ball milling according to the ball-material ratio of 20:1, the rotating speed of a ball mill is 150-200 rpm, ball milling time is 0.5-1.0 h, and then surface modification of the AB3 type hydrogen storage alloy is achieved by means of graphene. According to the method, operation is easy, the AB3 type hydrogen storage alloy is modified by graphene, alloy electrodes with high cycling performance are obtained, and the corrosion resistance of the electrodes is improved remarkably.

Description

technical field [0001] The invention belongs to the field of material chemistry and electrochemical research, in particular to a graphene pair AB 3 Type hydrogen storage alloy La 0.73 Ce 0.18 Mg 0.09 Ni 3.20 Al 0.21 mn 0.10 co 0.60 Methods for surface modification. Background technique [0002] MH / Ni secondary batteries have the advantages of high energy, environmental friendliness, long cycle life, and no memory effect, and are widely used in portable electrical equipment and hybrid electric vehicles. In order to make MH / Ni batteries more competitive in the market, many researchers have tried to improve the electrochemical performance of negative electrode materials. Among them, AB 3 Type hydrogen storage alloys have more development prospects due to their advantages of high discharge capacity, but their cycle stability and kinetic properties as anode materials need to be improved. [0003] Graphene is made of carbon atoms with sp 2 The hexagonal honeycomb lattic...

Claims

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Application Information

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IPC IPC(8): C22C19/03B22F1/00B22F9/04H01M4/38
CPCB22F1/0003B22F9/04B22F2009/043C22C19/03H01M4/383Y02E60/10
Inventor 黄红霞谢文强于文婉王新颖
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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