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High-voltage sodium ion battery layered oxide positive electrode material

A technology for sodium ion batteries and positive electrode materials, which is applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor cycle performance and low energy density of positive electrode materials, achieve slow desorption, facilitate rapid transmission, and reduce The effect of layer spacing

Pending Publication Date: 2021-12-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-voltage sodium ion electric layered positive electrode material, which can at least overcome the problems of low energy density and poor cycle performance of the existing sodium ion battery positive electrode materials.

Method used

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  • High-voltage sodium ion battery layered oxide positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of O3-NaLi 0.1 Fe 0.4 mn 0.5 o 1.9 f 0.1 Layered positive electrode material: Take 2.1mmol sodium carbonate, 0.2mmol lithium fluoride, 1.6mol ferrous oxide, and 2mol manganese oxide and mix them in a ball mill jar, fill the ball mill jar with Ar gas protection gas, and the ratio of the ball to material is 40: 1. The speed of the ball mill is 600rpm, the running time is 120min, and the four materials are fully mixed;

[0040] (2) Place the above mixed material in a muffle furnace for calcination, the heating rate is 5°C min -1 , the temperature is 900°C, the holding time is 16h, and cooled to room temperature; the calcined material is ground into powder.

[0041] Carry out XRD test on the prepared powder material, such as figure 1 As shown, it can be found that the material is a pure O3 phase, the space group is R-3m(166), and the microscopic morphology of the material is micron-sized particles, such as figure 2shown. The prepared positive electr...

Embodiment 2

[0048] (1) Preparation of P2-Na 0.8 Li 0.12 Ni 0.22 mn 0.66 o 1.92 f 0.08 Layered positive electrode material: Take 0.42mmol sodium carbonate, 0.08mmol lithium fluoride, 0.08mmol lithium carbonate, 0.22mol nickel oxide, 0.66mol manganese oxide and mix them in a ball mill tank. The ball material ratio is 60:1, and the ball mill speed is 450rpm, running time is 60min, fully mix several materials;

[0049] (2) Place the above mixed material in a muffle furnace for calcination, the heating rate is 5°C min -1 , the temperature is 950°C, the holding time is 12h, and the cooling rate is 1°C min -1 ; Grinding the calcined material into powder.

[0050] Carry out XRD test on the prepared powder material, such as image 3 As shown, it can be found that the material behaves as a pure P2 phase with a space group of P 63 / mmc, through the transmission electron microscope test, it can be seen that the material is a layered single crystal structure, such as Figure 4 shown. SEM te...

Embodiment 3

[0057] (1) Preparation of P2-Na 0.8 Li 0.3 Ni 0.2 mn 0.5 o 1.7 f 0.3 Layered positive electrode material: Mix 0.42mmol sodium carbonate, 0.3mmol lithium fluoride, 0.2mol nickel oxide, and 0.5mol manganese oxide and put them in a ball mill tank, fill the ball mill tank with Ar gas protection gas, and the ratio of ball material is 50: 1. The speed of the ball mill is 450rpm, the running time is 60min, and several materials are fully mixed;

[0058] (2) Place the above mixed material in a muffle furnace for calcination, the heating rate is 5°C min -1 , the temperature is 950°C, the holding time is 12h, and the cooling rate is 1°C min -1 ; Grinding the calcined material into powder.

[0059] The material behaves as a pure P2 phase with space group P 63 / mmc, the microscopic morphology of the material is micron-sized particles. According to the scheme in Example 1, a sodium-ion battery pole piece was prepared and a sodium-ion half-cell was assembled. Carry out the constan...

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Abstract

Disclosed is a high-voltage sodium ion battery layered oxide positive electrode material. The high-voltage sodium ion battery layered oxide positive electrode material has a general formula of Na<x>LiNM<c>O<2-y>F<y>, wherein x is more than 0.4 and less than or equal to 1, a+b+c=1, and 0<y<0.2. Li<+> is introduced into the metal layer of the layered oxide, F<-> is introduced into the oxygen layer of the layered oxide, and due to common introduction of Li<+> and F<->, the structural stability of the material can be improved, the sodium ion transmission rate can be increased, the rate performance of the material can be improved, reversible oxidation reduction of anion oxygen in the high-voltage charging and discharging process of the material can be excited, and the energy density and the power density of the material are effectively improved.

Description

technical field [0001] The invention relates to a positive electrode material of a sodium ion battery and its preparation. Background technique [0002] With the continuous development of society and economy, human's demand for energy is gradually increasing. The traditional fossil energy is a non-renewable energy. Excessive development makes the fossil energy exhausted on the one hand, and causes serious environmental pollution on the other hand. Therefore, developing clean, efficient, convenient, and abundant energy storage methods to alleviate energy and environmental pressures is an important way to achieve sustainable human development. In recent years, sodium-ion batteries, as an efficient and environmentally friendly energy storage method, have been favored by many domestic and foreign enterprises and researchers. Moreover, sodium resources are widely distributed, rich in crustal content, and low in price, which are very suitable for large-scale energy storage appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/485H01M4/505H01M4/525H01M4/131H01M10/054
CPCH01M4/505H01M4/525H01M4/485H01M4/628H01M4/131H01M10/054H01M2004/028H01M2004/021Y02E60/10
Inventor 白莹吴川任海霞李雨吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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