Sodium ion battery nanosheet array nickel phosphide/three-dimensional (3D) graphene composite material and preparation method thereof

Abstract

The invention discloses a sodium ion battery nanosheet array nickel phosphide / three-dimensional (3D) graphene composite material and a preparation method thereof. The preparation method comprises the steps of preparing 3D graphene by using foam nickel and a chemical vapor deposition (CVD) method, enabling the 3D graphene and deionized water having a pH value of 3 to be subjected to a hydrothermal reaction, and generating an Ni(OH)2 nanosheet array structure on a foam nickel substrate loaded with the 3D graphene; respectively placing nanosheet array Ni(OH)2 / 3D graphene composite material and a phosphorus source at the two ends of a tube furnace, heating the tube furnace, replenishing one end of the tube furnace, where the inorganic phosphorus source is placed, with flowing inert gas, and carrying out heat treatment; cooling the product of the reaction to room temperature to obtain the nanosheet array nickel phosphide / 3D graphene composite material. The whole preparation method provided by the invention is simple and environmentally-friendly; nickel phosphide is compounded with the 3D graphene, so that the material performance is improved; when the composite material is used as a self-supported sodium ion battery anode material, a conductive additive is not needed; the sodium ion battery nanosheet array nickel phosphide / 3D graphene composite material has high specific capacity and good rate performance, thus having a wide industrial application prospect.

Description

technical field

[0001] The invention belongs to a sodium-ion battery electrode material and a preparation method thereof, in particular to a sodium-ion battery nanosheet array nickel phosphide / 3D graphene composite material and a preparation method thereof, belonging to the field of sodium-ion batteries. Background technique

[0002] With the consumption of energy, renewable energy has gradually attracted people's attention, and lithium batteries as renewable energy storage devices are also widely used in implanted devices such as automobiles, laptop computers, mobile phones, and cardiac pacemakers. However, lithium resources on the earth are limited and unevenly distributed globally, resulting in high cost of lithium batteries. Based on this, people are more inclined to pursue efficient, environmentally friendly and low-cost energy.

[0003] Sodium is one of the most abundant elements on the earth, accounting for about 2.74% of the earth's crust. It belongs to the same mai...

Examples

Embodiment 1

[0022] The preparation method of nanosheet array nickel phosphide / 3D graphene composite material in the present embodiment comprises the following steps:

[0023] 1) Preparation of 3D graphene (3DG) at high temperature

[0024] First, cut 4cm*6cm foam nickel (about 0.8571g), put the foam nickel in a beaker, use absolute ethanol and deionized water for 15 minutes, and dry it, then put the treated foam nickel into argon and The tube furnace of hydrogen, the ratio of the argon and hydrogen is 2.5, the tube furnace is heated, the heating time is 2.5 hours, and the heating time is the second hour ± 5-10mim, the temperature of the tube furnace is At 1000°C, 5-10 sccm of methane was injected for 10 minutes. After the ventilation, the quartz tube with nickel foam was pulled out quickly, and the part of the quartz tube with nickel foam was placed in air to cool, (and at this time the tube Cool down from 1000°C to 0°C within 10-20 minutes), and cool to room temperature to obtain nickel...

Embodiment 2

[0033] The preparation method of nanosheet array nickel phosphide / 3D graphene composite material in the present embodiment comprises the following steps:

[0034] 1) Preparation of 3D graphene (3DG) at high temperature

[0035] First, cut 4cm*6cm foam nickel (about 0.9071g), put the foam nickel in a beaker, and use absolute ethanol and deionized water to sonicate for 15 minutes, dry, and then put the treated foam nickel into argon and The tube furnace of hydrogen, the ratio of the argon and hydrogen is 2.5, the tube furnace is heated, the heating time is 2.5 hours, and the heating time is the second hour ± 5-10mim, the temperature of the tube furnace is At 1000°C, 5-10 sccm of methane was injected for 10 minutes. After the ventilation, the quartz tube with nickel foam was pulled out quickly, and the part of the quartz tube with nickel foam was placed in air to cool, (and at this time the tube Cool down from 1000°C to 0°C within 10-20 minutes), and cool to room temperature to ...

Embodiment 3

[0043] The preparation method of nanosheet array nickel phosphide / 3D graphene composite material in the present embodiment comprises the following steps:

[0044] 1) Preparation of 3D graphene (3DG) at high temperature

[0045] First, cut 4cm*6cm foam nickel (about 0.9071g), put the foam nickel in a beaker, use absolute ethanol and deionized water for 15 minutes, and dry it, then put the treated foam nickel into argon and The tube furnace of hydrogen, the ratio of the argon and hydrogen is 2.5, the tube furnace is heated, the heating time is 2.5 hours, and the heating time is the second hour ± 5-10mim, the temperature of the tube furnace is At 1000°C, 5-10 sccm of methane was injected for 10 minutes. After the ventilation, the quartz tube with nickel foam was pulled out quickly, and the part of the quartz tube with nickel foam was placed in air to cool, (and at this time the tube Cool down from 1000°C to 0°C within 10-20 minutes), and cool to room temperature to obtain nickel...

technical field

[0001] The invention belongs to a sodium-ion battery electrode material and a preparation method thereof, in particular to a sodium-ion battery nanosheet array nickel phosphide / 3D graphene composite material and a preparation method thereof, belonging to the field of sodium-ion batteries. Background technique

[0002] With the consumption of energy, renewable energy has gradually attracted people's attention, and lithium batteries as renewable energy storage devices are also widely used in implanted devices such as automobiles, laptop computers, mobile phones, and cardiac pacemakers. However, lithium resources on the earth are limited and unevenly distributed globally, resulting in high cost of lithium batteries. Based on this, people are more inclined to pursue efficient, environmentally friendly and low-cost energy.

[0003] Sodium is one of the most abundant elements on the earth, accounting for about 2.74% of the earth's crust. It belongs to the same mai...

Examples

Embodiment 1

[0022] The preparation method of nanosheet array nickel phosphide / 3D graphene composite material in the present embodiment comprises the following steps:

[0023] 1) Preparation of 3D graphene (3DG) at high temperature

[0024] First, cut 4cm*6cm foam nickel (about 0.8571g), put the foam nickel in a beaker, use absolute ethanol and deionized water for 15 minutes, and dry it, then put the treated foam nickel into argon and The tube furnace of hydrogen, the ratio of the argon and hydrogen is 2.5, the tube furnace is heated, the heating time is 2.5 hours, and the heating time is the second hour ± 5-10mim, the temperature of the tube furnace is At 1000°C, 5-10 sccm of methane was injected for 10 minutes. After the ventilation, the quartz tube with nickel foam was pulled out quickly, and the part of the quartz tube with nickel foam was placed in air to cool, (and at this time the tube Cool down from 1000°C to 0°C within 10-20 minutes), and cool to room temperature to obtain nickel...

Embodiment 2

[0033] The preparation method of nanosheet array nickel phosphide / 3D graphene composite material in the present embodiment comprises the following steps:

[0034] 1) Preparation of 3D graphene (3DG) at high temperature

[0035] First, cut 4cm*6cm foam nickel (about 0.9071g), put the foam nickel in a beaker, and use absolute ethanol and deionized water to sonicate for 15 minutes, dry, and then put the treated foam nickel into argon and The tube furnace of hydrogen, the ratio of the argon and hydrogen is 2.5, the tube furnace is heated, the heating time is 2.5 hours, and the heating time is the second hour ± 5-10mim, the temperature of the tube furnace is At 1000°C, 5-10 sccm of methane was injected for 10 minutes. After the ventilation, the quartz tube with nickel foam was pulled out quickly, and the part of the quartz tube with nickel foam was placed in air to cool, (and at this time the tube Cool down from 1000°C to 0°C within 10-20 minutes), and cool to room temperature to ...

Embodiment 3

[0043] The preparation method of nanosheet array nickel phosphide / 3D graphene composite material in the present embodiment comprises the following steps:

[0044] 1) Preparation of 3D graphene (3DG) at high temperature

[0045] First, cut 4cm*6cm foam nickel (about 0.9071g), put the foam nickel in a beaker, use absolute ethanol and deionized water for 15 minutes, and dry it, then put the treated foam nickel into argon and The tube furnace of hydrogen, the ratio of the argon and hydrogen is 2.5, the tube furnace is heated, the heating time is 2.5 hours, and the heating time is the second hour ± 5-10mim, the temperature of the tube furnace is At 1000°C, 5-10 sccm of methane was injected for 10 minutes. After the ventilation, the quartz tube with nickel foam was pulled out quickly, and the part of the quartz tube with nickel foam was placed in air to cool, (and at this time the tube Cool down from 1000°C to 0°C within 10-20 minutes), and cool to room temperature to obtain nickel...

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