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Preparation method of hydrogen-storage alloy/graphene composite material for nickel-hydrogen battery

A technology for hydrogen storage alloys and nickel-metal hydride batteries, applied in battery electrodes, nickel storage batteries, alkaline storage batteries, etc., can solve the problems of graphene sheet thickness reduction effect, influence on electrochemical performance, unsatisfactory and other problems, and achieve excellent electrochemical performance performance, improved cycle stability and kinetics, and the effect of large specific surface area

Active Publication Date: 2018-05-22
淄博君行电源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in recent years, hydrogen storage alloy / graphene composite material has become a new type of negative electrode material. However, due to the thick and unsatisfactory reduction effect of the prepared graphene sheet, its electrochemical performance is affected to a certain extent, making There is still a lot of room for improvement in the cycle stability and kinetic properties of hydrogen storage alloy / graphene composites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh the raw materials according to the molar ratio of propylene oxide, hydrazine hydrate and water as 1:3:8; add hydrazine hydrate and water into a 500mL three-necked flask first, and then add propylene oxide dropwise using a constant pressure funnel , during the reaction, mechanical stirring was used, and the reaction was refluxed at 70°C for 3 hours to prepare epoxy etherified hydrazine;

[0020] (2) Weigh 100 mg of graphene oxide and add it into 100 mL of deionized water, sonicate for 30 min to obtain an aqueous dispersion of graphene oxide, then add 70 mg of epoxy etherified hydrazine, reflux at 95 °C for 10 h, and then Washing with absolute ethanol and deionized water to neutrality, freeze-drying, and preparing graphene;

[0021] (3) Take an appropriate amount of graphene 20mg and add it to the solvent N,N-dimethylacetamide, and ultrasonicate for 30 minutes to prepare a graphene suspension; take a certain amount of hydrogen storage alloy powder 980mg and plac...

Embodiment 2

[0023] (1) Weigh the raw materials according to the molar ratio of propylene oxide, hydrazine hydrate and water as 1:2.8:8.3; add hydrazine hydrate and water into a 500mL three-necked flask first, and then add propylene oxide dropwise using a constant pressure funnel , during the reaction, mechanical stirring was used, and the reaction was refluxed at 69° C. for 3.2 hours to prepare epoxy etherified hydrazine;

[0024] (2) Weigh 100 mg of graphene oxide and add it to 100 mL of deionized water, sonicate for 30 min to obtain an aqueous dispersion of graphene oxide, then add 75 mg of epoxy etherified hydrazine, reflux at 96 °C for 9.5 h, and then Washing with absolute ethanol and deionized water to neutrality, freeze-drying, and preparing graphene;

[0025] (3) Take an appropriate amount of graphene 20mg and add it to the solvent N,N-dimethylacetamide, and ultrasonicate for 33 minutes to prepare a graphene suspension; take a certain amount of hydrogen storage alloy powder 975mg a...

Embodiment 3

[0027] (1) Weigh the raw materials according to the molar ratio of propylene oxide, hydrazine hydrate and water as 1: 3.1: 7.8; add hydrazine hydrate and water into a 500mL three-necked flask first, and then add propylene oxide dropwise using a constant pressure funnel , during the reaction, mechanical stirring was used, and the reaction was refluxed at 72°C for 2.8 hours to prepare epoxy etherified hydrazine;

[0028] (2) Weigh 100 mg of graphene oxide and add it into 100 mL of deionized water, sonicate for 30 min to obtain an aqueous dispersion of graphene oxide, then add 65 mg of epoxy etherified hydrazine, reflux at 94.5 °C for 10.5 h, and then Washing with absolute ethanol and deionized water to neutrality, freeze-drying, and preparing graphene;

[0029] (3) Take an appropriate amount of graphene 20mg and add it to the solvent N,N-dimethylacetamide, and ultrasonicate for 38 minutes to prepare a graphene suspension; take a certain amount of hydrogen storage alloy powder 98...

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Abstract

The invention relates to a preparation method of a hydrogen-storage alloy / graphene composite material for a nickel-hydrogen battery, and belongs to the technical field of a nickel-hydrogen battery electrode material. The preparation method is characterized by comprising the steps of reducing graphene oxide to prepare graphene by employing hydrazine epoxide as a reducing agent; and modifying hydrogen-storage alloy by the prepared graphene so that a layer of graphene coating film is formed on a surface of the graphene, wherein the step of reducing the graphene oxide to prepare the graphene comprises the steps of adding the graphene oxide into deionized water to obtain a graphene oxide aqueous dispersion liquid, backflowing the hydrazine epoxide for 9-11 hours under a temperature of 94-97 DEGC, washing the product with absolute ethyl alcohol and the deionized water to neutral, and freezing and drying to prepare the graphene. By the preparation method, the cycle stability and the dynamicperformance of the hydrogen-storage alloy negative electrode material are improved, and the hydrogen storage capacity and the high-rate discharging performance of the negative electrode material are improved.

Description

technical field [0001] The invention discloses a method for preparing a hydrogen storage alloy / graphene composite material for a negative electrode of a nickel-hydrogen battery, belonging to the technical field of nickel-hydrogen battery electrode materials. Background technique [0002] In recent years, with the rapid development of the economy, environmental problems have become increasingly severe, and fossil energy has been gradually exhausted. The development of clean and renewable energy may become an important way to solve these energy and environmental problems. Nickel-metal hydride secondary batteries have the characteristics of high energy, environmental friendliness, long cycle life, and no memory effect, and are widely used in portable electrical equipment and hybrid electric vehicles. As the anode material of nickel-metal hydride batteries, hydrogen storage alloy has the advantage of high discharge capacity, but its cycle stability and dynamic performance are no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/30
CPCH01M4/366H01M4/383H01M4/62H01M10/30Y02E60/10
Inventor 刘浩浩胡欣欣
Owner 淄博君行电源技术有限公司
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