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Method for modifying La-Mg-Ni based hydrogen storage alloy through n-heptanal p-phenylenediamine bis-schiff base

A technology of p-phenylenediamine bis-Schiff base and hydrogen storage alloy with n-heptanaldehyde, which is applied in the field of material chemistry and electrochemical research, and achieves the effects of simple operation, easy promotion and application, good cycle stability and electrochemical performance

Inactive Publication Date: 2016-10-12
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some studies have used element substitution method, fluorination treatment, etc. to improve the cycle stability of La-Mg-Ni-based alloys, but there are few reports on the modification of La-Mg-Ni-based alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) According to 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 Weigh the metal powder with a purity of 99.9% according to the molar ratio, and then prepare the La-Mg-Ni-based hydrogen storage alloy by vacuum induction melting under the protection of argon, grind it, and pass it through 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 powder.

[0011] (2) Take 2.5 mmol of p-phenylenediamine, dissolve it in 15 mL of absolute ethanol, add it into a three-necked flask, place it in a water bath at 50 °C, take 5 mmol of n-heptanal, dissolve it in 5 mL of absolute ethanol, and then Slowly add it dropwise into the above-mentioned three-necked flask, react for 3 hours, and obtain a light yellow floc, then wash the product with absolute ethanol, and dry the product in the air to obtain n-heptanal p-phenylenediamine bis-Schiff alkali.

[0012] (3) ...

Embodiment 2

[0014] (1) According to 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 Weigh the metal powder with a purity of 99.9% according to the molar ratio, and then prepare the La-Mg-Ni-based hydrogen storage alloy by vacuum induction melting under the protection of argon, grind it, and pass it through 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 powder.

[0015] (2) Take 2.5 mmol of p-phenylenediamine, dissolve it in 15 mL of absolute ethanol, add it into a three-necked flask, place it in a water bath at 50 °C, take 5 mmol of n-heptanal, dissolve it in 5 mL of absolute ethanol, and then Slowly add it dropwise into the above-mentioned three-necked flask, react for 3 hours, and obtain a light yellow floc, then wash the product with absolute ethanol, and dry the product in the air to obtain n-heptanal p-phenylenediamine bis-Schiff alkali.

[0016] (3) ...

Embodiment 3

[0018] (1) According to 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 Weigh the metal powder with a purity of 99.9% according to the molar ratio, and then prepare the La-Mg-Ni-based hydrogen storage alloy by vacuum induction melting under the protection of argon, grind it, and pass it through 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 powder.

[0019] (2) Take 2.5 mmol of p-phenylenediamine, dissolve it in 15 mL of absolute ethanol, add it into a three-neck flask, put it in a water bath at 50 °C, take 5 mmol of n-heptanal, dissolve it in 5 mL of absolute ethanol, and then Slowly add it dropwise into the above-mentioned three-necked flask, react for 3 hours, and obtain a light yellow floc, then wash the product with absolute ethanol, and dry the product in isolation from the air to obtain n-heptanal p-phenylenediamine bis-Schiff alkali.

...

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Abstract

The invention discloses a method for modifying La-Mg-Ni based hydrogen storage alloy through n-heptanal p-phenylenediamine bis-schiff base. The method comprises the following steps: correspondingly preparing the La-Mg-Ni based hydrogen storage alloy which is La0.73Ce0.18Mg0.09Ni3.20Al0.21Mn0.10Co0.60, and n-heptanal p-phenylenediamine bis-schiff base; mixing the two components based on the following weight percentage: 96 to 99% of La-Mg-Ni based hydrogen storage alloy, and 1 to 4% of n-heptanal p-phenylenediamine bis-schiff base, wherein the sum of the two components in weight percentage is 100%; and performing ball milling based on the ball-to-material ratio of 20: 1 through a ball mill runs at the speed of 150 to 200rpm for 0.5 to 1.0 hour after mixing, thus achieving the modification of the La-Mg-Ni based hydrogen storage alloy. The method is simple to operate, and convenient to popularize, and can effectively improve the circulating stability and electrochemical performance of a La-Mg-Ni based hydrogen storage alloy electrode.

Description

technical field [0001] The invention belongs to the field of material chemistry and electrochemical research, in particular to a 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 modified method. Background technique [0002] Rare earth base AB 5 As the anode material of commercial Ni / MH secondary battery, the hydrogen storage alloy has a discharge capacity of 340 mAh / g, which is close to the theoretical value of 348 mAh / g, and there is little room for improvement. A new La-Mg-Ni based alloy with a discharge capacity of 410 mAh / g is considered the most likely replacement for rare earth based AB 5 type hydrogen storage alloy. However, La-Mg-Ni-based hydrogen storage alloys are prone to corrosion and pulverization, resulting in a rapid capacity decay of the electrode. Some studies have used element substitution method, fluorination treatment, etc. to improve the cycle stability of La-Mg-Ni-based alloys, but there are few...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C19/03B22F9/04
CPCC22C19/007C22C19/03B22F9/04B22F1/145
Inventor 黄红霞谢文强于文婉王新颖
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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