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Titanium-based negative electrode active material of sodium-ion battery and preparation method and application thereof

A negative electrode active material and sodium ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in ensuring the charging and discharging process, low potential of the sodium storage platform, and poor cycle performance, achieving low cost, The effect of high energy density and power density and excellent safety performance

Pending Publication Date: 2020-12-01
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, hard carbon has better overall performance as the negative electrode material of sodium-ion batteries, but its sodium storage platform potential is relatively low, which makes it difficult to ensure a safe charge and discharge process; and alloy materials have a large volume deformation during the process of sodium intercalation, which is easy to cause electrode pieces. Pulverization, poor cycle performance

Method used

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  • Titanium-based negative electrode active material of sodium-ion battery and preparation method and application thereof
  • Titanium-based negative electrode active material of sodium-ion battery and preparation method and application thereof
  • Titanium-based negative electrode active material of sodium-ion battery and preparation method and application thereof

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Effect test

Embodiment 1

[0060] This embodiment adopts solid-phase method to prepare titanium-based negative electrode active material Na 0.65 Li 0.13 Mg 0.13 Ti 0.74 o 2 , the specific steps include: weighing Na according to the stoichiometric ratio of the desired active material 2 CO 3 (5% excess), LiOH·H 2 O (excess 5%), MgO and nano anatase TiO 2 In an agate mortar, add an appropriate amount of absolute ethanol to mix and grind evenly to obtain a precursor. The precursor is pressed into a disc with a diameter of 15mm under a pressure of 10Mpa, and treated in a muffle furnace at 1000°C for 15 hours to obtain a white powder sheet which is ground and ready for use, which is the titanium-based negative electrode active material of the present invention. 0.65 Li 0.13 Mg 0.13 Ti 0.74 o 2 .

[0061] Figure 4 It is the XRD spectrum of the titanium-based negative electrode active material prepared in this example. Compared with the standard card, it can be seen that it is a P2 phase material ...

Embodiment 2

[0063] This embodiment adopts solid-phase method to prepare titanium-based negative electrode active material Na 0.65 Li 0.13 Mg 0.13 Ti 0.74 o 2 , the specific steps include: weighing Na according to the stoichiometric ratio of the required active material 2 CO 3 (5% excess), LiOH·H 2 O (excess 5%), MgO and nano anatase TiO 2 In an agate mortar, add an appropriate amount of absolute ethanol to mix and grind evenly to obtain a precursor, press the precursor into a disc with a diameter of 15mm under a pressure of 10Mpa, and process it in a muffle furnace at 1000°C for 24 hours to obtain a white powder After the sheet is ground, it is standby, which is the titanium-based negative electrode active material Na of the present invention. 0.65 Li 0.13 Mg 0.13 Ti 0.74 o 2 .

[0064] Figure 7 It is a scanning electron microscope (SEM) figure of the titanium-based negative electrode active material prepared by the present embodiment. It can be seen that the particle size i...

Embodiment 3

[0066] This embodiment adopts solid-phase method to prepare titanium-based negative electrode active material Na 0.65 Li 0.13 Mg 0.13 Ti 0.74 o 2 , the specific steps include: weighing Na according to the stoichiometric ratio of the desired active material 2 CO 3 (not excessive), LiOH·H 2 O (no excess), MgO and nano-anatase TiO 2 In an agate mortar, add an appropriate amount of absolute ethanol, mix and grind evenly to obtain a precursor, press the precursor into a disc with a diameter of 15mm under a pressure of 10Mpa, and process it in a muffle furnace at 1000°C for 15 hours to obtain a white powder After the sheet is ground, it is standby, which is the titanium-based negative electrode active material Na of the present invention. 0.65 Li 0.13 Mg 0.13 Ti 0.74 o 2 .

[0067] Figure 6 It is the XRD pattern of the titanium-based negative electrode active material prepared in this example. Compared with the standard card, it can be seen that its main phase is P2 ph...

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Abstract

The invention discloses a titanium-based negative electrode active material of a sodium-ion battery and a preparation method and application thereof. The general chemical formula of the titanium-basednegative electrode active material is NaxLiyMgzTi(1-y-z)O2-[delta], wherein x is greater than or equal to 0.5 and less than or equal to 0.67, y is greater than or equal to 0.02 and less than or equalto 0.25, z is greater than or equal to 0.1 and less than or equal to 0.35, and [delta] is greater than or equal to 0 and less than or equal to 0.05; the titanium-based negative electrode active material is a substance with a P2 pure phase or a P2 phase as a main phase, and the space group is P63 / mmc. According to the titanium-based negative electrode active material of the sodium-ion battery, thetitanium-based negative electrode active material is formed by matching the magnesium element with rich resources with a small amount of lithium element, the cost is low, the volume deformation is small, the reversible charge-discharge potential is moderate, the circulation is stable, and the capacity retention ratio can be stabilized at about 90% after 400 times of circulation.

Description

technical field [0001] The invention relates to the technical field of sodium battery materials, in particular to a titanium-based negative electrode active material for a sodium ion battery and a preparation method and application thereof. Background technique [0002] With the advancement of science and technology, a series of green and clean energy such as solar energy, wind energy, water energy, nuclear energy, tidal energy, etc. have been developed and utilized, becoming the best choice to replace fossil energy. However, the instantaneity and volatility of new energy power generation affect the safe operation of the power grid. Therefore, it is necessary to develop high-performance energy storage and conversion devices to lay a good foundation for the use and development of new energy. Lithium-ion secondary batteries, which are widely used in portable devices, as a green and high-performance secondary battery, have now promoted industrial changes in the fields of new en...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/38H01M4/40H01M10/054H01M4/36H01M4/583H01M4/62
CPCH01M4/485H01M4/38H01M4/405H01M10/054H01M4/366H01M4/583H01M4/625Y02E60/10
Inventor 胡勇胜丁飞翔容晓晖牛耀申陆雅翔高飞杨凯陈立泉
Owner CHINA ELECTRIC POWER RES INST