Method for preparing graphene-based sodium ion battery negative electrode material

Patent metadata

Field	Value
Publication number	US-12234153-B2
Application number	US-202218558181-A
Country	US
Kind code	B2
Filing date	Jul 28, 2022
Priority date	Oct 28, 2021
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

Disclosed is a method for preparing a graphene-based sodium ion battery negative electrode material, including adding graphene oxide into ethanol absolute, carrying out ultrasonic treatment at a certain temperature to obtain a graphene oxide alcohol dispersion, then preparing a sodium hexanitritocobaltate solution, adding the graphene oxide alcohol dispersion into the sodium hexanitritocobaltate solution, carrying out solid-liquid separation to obtain a solid, isolating the solid from oxygen for calcination, and washing and drying to obtain a graphene-based sodium ion battery negative electrode material.

First claim

The invention claimed is:

1. A preparation method for a graphene-based anode material for sodium-ion batteries comprising the following steps:
adding graphene oxide into anhydrous ethanol and conducting ultrasonic treatment at 30° C. to 60° C. to obtain a graphene oxide ethanol dispersion solution;
dissolving cobalt nitrate and sodium nitrite with water to obtain a solution A;
adding acetic acid to the solution A, adding hydrogen peroxide for an oxidation reaction of the cobalt nitrate, and performing solid-liquid separation on a material after the oxidation reaction of the cobalt nitrate to obtain a solution B of sodium hexanitrocobaltate; and
adding the graphene oxide ethanol dispersion solution into the solution B of sodium hexanitrocobaltate, performing solid-liquid separation on a reacted material to obtain a solid, calcining the solid under oxygen isolation at a temperature of 500° C. to 800° C. for 2-8 h, and washing and drying a solid after the calcining to obtain the graphene-based anode material for sodium-ion batteries;
wherein the graphene-based anode material for sodium-ion batteries is composed of cobalt monoxide and nitrogen-doped graphene oxide, wherein the nitrogen-doped graphene oxide has a mass fraction of 30% to 90% and the rest is the cobalt monoxide.

2. The preparation method of claim 1 , wherein the ultrasonic treatment is conducted for 30 to 240 min.

3. The preparation method of claim 1 , wherein the anhydrous ethanol and the graphene oxide have a liquid-solid ratio of 1 mL:(0.05-0.2) g.

4. The preparation method of claim 1 , wherein in the solution A, a concentration of cobalt ions is 1 to 2 mol/L, and a concentration of the sodium nitrite is 8 to 12 mol/L.

5. The preparation method of claim 1 , wherein the acetic acid has a mass concentration of 50% to 60% and the acetic acid and the solution A have a volume ratio of (1-2):5.

6. The preparation method of claim 1 , wherein the hydrogen peroxide has a mass concentration of 25% to 35% and the hydrogen peroxide and the solution A have a volume ratio of (1-2):5.

7. The preparation method of claim 1 , wherein before the calcining, the solid is further washed with anhydrous ethanol.

8. The preparation method of claim 1 , wherein the graphene oxide ethanol dispersion solution and the solution B have a volume ratio of (1.5-4):1.

9. The preparation method of claim 1 , wherein the solid-liquid separation is conducted in a centrifugation manner.

Assignees

• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd
• Hunan Brunp Ev Recycling Co Ltd

Inventors

• Yu Haijun
• Xie Yinghao
• Li Aixia
• Zhang Xuemei
• Li Changdong

Classifications

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• C01G51/04 Primary

  Oxides · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title