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Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery

A technology for sodium ion batteries and cathode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor electrochemical cycle performance, slow reaction kinetics, affecting material properties, etc., and achieve suitable large-scale production. Application, the effect of improving specific surface area and tap density, and improving cycle performance

Active Publication Date: 2021-03-26
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prussian blue analogues have three-dimensional sodium ion intercalation channels that can be used for intercalation and extraction of sodium ions with larger ionic radii, but there are a large number of vacancies in the material, which will cause the material The collapse of the structure; in addition, there is a large amount of coordination water in the material, and these water molecules will also affect the performance of the material
The frame structure of polyanion materials is stable, showing excellent structural stability, and the inductive effect of polyanions can further increase the working voltage of the material; but the three-dimensional structure of polyanions cannot provide more Na + intercalation site, resulting in a lower specific capacity of this type of material, in addition Na + Migration in 3D tunnels also exhibits slower reaction kinetics
[0004] Layered transition metal oxides are one of the research hotspots of cathode materials for sodium-ion batteries because of their reversible ion-deintercalation ability and stable layered structure, which is conducive to intercalation of other ions or molecules between layers. Although layered oxide cathode materials have high theoretical specific capacity and Na + Two-dimensional diffusion in the layer is faster, but the electrochemical cycling performance of the material is poor

Method used

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  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery
  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery
  • Sodium ion battery positive electrode material, preparation method thereof and sodium ion battery

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Embodiment 1

[0050] The present invention adopts following method to prepare sodium ion battery cathode material:

[0051](1) 55g CH 3 COONa, 82.1g (CH 3 COO) 2 Ni·4H 2 O and 164.2g (CH 3 COO) 2 Mn 4H 2 O (the molar ratio of Na, Ni, Mn is 0.67:0.33:0.67) is added in 1L ethanol respectively, obtains sodium acetate solution, nickel acetate solution and manganese acetate solution; Then sodium acetate solution, nickel acetate solution and manganese acetate solution Mix well and place in the autoclave, and seal the autoclave;

[0052] (2) Control the pressure of the autoclave to be 15MPa, and react the autoclave in an oil bath at 160° C. for 10 h;

[0053] (3) The product is washed with water and ethanol three times respectively, and dried at a temperature of 80° C. in a spray dryer for 10 minutes; stability in

[0054] (4) Put the sagger containing the cleaned product in a muffle furnace, the calcination temperature is 700°C, and the heating rate is 3.5°C / min, and it is calcined at a ...

Embodiment 2

[0058] The present invention adopts following method to prepare sodium ion battery cathode material:

[0059] (1) 72.25g NaNO 3 , 105.2g NiSO 4 ·6H 2 O and 174.6g Co(NO 3 ) 2 (the molar ratio of Na, Ni, Co is 0.85:0.4:0.6) join in 1L ethanol respectively, obtain sodium nitrate solution, nickel sulfate solution and cobalt nitrate solution; Then mix sodium nitrate solution, nickel sulfate solution and cobalt nitrate solution Place evenly in the autoclave, and seal the autoclave;

[0060] (2) Control the pressure of the autoclave to be 20MPa, and react the autoclave in an oil bath at 170° C. for 12 hours;

[0061] (3) The resultant was washed twice with water and twice with ethanol, and dried for 5 minutes at a temperature of 100° C. in a spray dryer;

[0062] (4) Put the sagger containing the cleaned product in a muffle furnace, the calcination temperature is 600°C, the heating rate is 2°C / min, and it is calcined at a high temperature for 10 hours in a compressed air atmos...

Embodiment 3

[0065] The present invention adopts following method to prepare sodium ion battery cathode material:

[0066] (1) 68g NaNO 3 , 54.8g Ni(NO 3 ) 2 with 88.1g MnCl 2 (the molar ratio of Na, Ni, Mn is 0.8:0.3:0.7) join in 1L ethanol respectively, obtain sodium nitrate solution, nickel nitrate solution and manganese chloride solution; Then sodium nitrate solution, nickel nitrate solution and manganese chloride solution The solution is mixed and placed in the autoclave, and the autoclave is sealed;

[0067] (2) Control the pressure of the autoclave to be 10MPa, and react the autoclave in an oil bath at 180° C. for 8 hours;

[0068] (3) The resultant was washed with water and ethanol three times respectively, and dried in a spray dryer at a temperature of 90° C. for 8 minutes;

[0069] (4) Put the sagger containing the cleaned product in a muffle furnace, the calcination temperature is 800°C, and the heating rate is 3°C / min, and it is calcined at a high temperature for 6 hours i...

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Abstract

The invention provides a sodium ion battery positive electrode material, a preparation method thereof and a sodium ion battery. The chemical formula of the sodium ion battery positive electrode material is NaxNiyM<1-y>O2, x is greater than 0.5 and less than 1, y is greater than 0.1 and less than 0.5, and M is selected from at least one of Mn, Fe, Co, V, Cu, Cr and Ti. The sodium ion battery positive electrode material is spherical-like particles, and has a layered structure. The sodium ion battery positive electrode material has good charge-discharge specific capacity and cycle performance. According to the preparation method, the precursor mixed solution is controlled to react under the conditions of high temperature and high pressure, so that the interlayer oxygen content of the layeredstructure of the positive electrode material of the sodium-ion battery is effectively reduced, and the cycle performance of the material is obviously improved. The preparation process is simple in steps, easily available in raw materials, easy to implement and suitable for large-scale production and application.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a sodium ion battery cathode material, a preparation method thereof, and a sodium ion battery. Background technique [0002] In recent years, the production and sales of new energy vehicles in China have continued to grow, ranking first in the world. However, traditional lead-acid batteries and nickel-cadmium batteries have low energy efficiency and serious pollution, and lithium-ion batteries have high cost and need to be improved in safety. With the surge in demand for new energy vehicles, it is difficult to meet market demand. Due to the advantages of high safety, low cost, and environmental friendliness, sodium-ion batteries are favored by researchers, which promotes the application of sodium-ion batteries in power batteries. Positive and negative electrode materials, electrolyte and separator are important components of sodium-ion batteries, among w...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/58H01M10/054C01D13/00
CPCH01M4/525H01M4/505H01M4/5825H01M10/054C01D13/00H01M2004/028H01M2004/021Y02E60/10
Inventor 时爽二庞晨阳戚昌伟张立君张会斌王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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