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Aluminum isopropoxide coated Na2Mn8O16-carbon nanotube sodium ion positive electrode material and preparation method thereof

A na2mn8o16-, aluminum isopropoxide technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low conductivity and rate performance, collapse of positive electrode material matrix, loss of electrochemical performance, etc. The effect of improving cycle performance, reducing electrochemical specific capacity loss, improving rate capability and electrochemical performance

Inactive Publication Date: 2020-02-18
王杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the invention provides a sodium ion positive electrode material coated with aluminum isopropoxide Na2Mn8O16-carbon nanotubes, which solves the problem of NaxMO 2 The oxides (M=Fe, Mn, Co, V, Ti) have low conductivity and rate performance, and their structural stability is poor. During the continuous charge and discharge process, due to Na + The trace stress and strain generated by the continuous migration lead to NaxMO 2 The loss of oxide structure causes the cathode material matrix to collapse and lose electrochemical performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of Na 2 mn 8 o 16 : Set up a reflux device in a 2000 mL reaction bottle, then add 800 mL of distilled water, then weigh 95 parts of anhydrous manganese chloride and 5 parts of sodium carbonate in turn and add them to the reaction bottle, slowly add sodium hydroxide powder, and adjust the pH to 8. Place the reaction bottle in an oil bath, heat to 100 °C, and stir at a constant speed for 12 h. After the reaction, cool the reaction bottle to room temperature and filter the solution to remove water to obtain a solid mixture. Wash the solid mixture with 3000 mL of distilled water to remove To react impurities, put the cleaned product in a tubular resistance box, set the temperature rise rate to 10 ℃ / min, raise it to 750 ℃, and keep the temperature for calcination for 6 hours. After the calcination, stop heating and cool the calcined product to room temperature. And sequentially use 200 mL of dilute hydrochloric acid with a substance concentration of 1.6 mol...

Embodiment 2

[0029] (1) Preparation of Na 2 mn 8 o 16 : Set up a reflux device in a 2000 mL reaction bottle, then add 900 mL of distilled water, then weigh 91 parts of anhydrous manganese chloride and 9 parts of sodium carbonate in sequence and add them to the reaction bottle, slowly add sodium hydroxide powder, and adjust the pH to 8. Place the reaction bottle in an oil bath, heat to 100 °C, and stir at a constant speed for 12 h. After the reaction, cool the reaction bottle to room temperature and filter the solution to remove water to obtain a solid mixture. Wash the solid mixture with 3000 mL of distilled water to remove To react impurities, put the cleaned product in a tubular resistance box, set the temperature rise rate to 10 ℃ / min, rise to 760 ℃, and keep the temperature for calcination for 7 hours. After the calcination, stop heating and cool the calcined product to room temperature. And sequentially use 250 mL of dilute hydrochloric acid with a substance concentration of 1.6 mol...

Embodiment 3

[0032] (1) Preparation of Na 2 mn 8 o 16 : Set up a reflux device in a 2000 mL reaction bottle, then add 900 mL of distilled water, then weigh 92 parts of anhydrous manganese chloride and 8 parts of sodium carbonate in sequence and add them to the reaction bottle, slowly add sodium hydroxide powder, and adjust the pH to 9. Place the reaction bottle in an oil bath, heat to 105 °C, and stir at a constant speed for 15 h. After the reaction, cool the reaction bottle to room temperature and filter the solution to remove water to obtain a solid mixture. Wash the solid mixture with 3500 mL of distilled water to remove To react impurities, put the cleaned product in a tubular resistance box, set the temperature rise rate to 10 ℃ / min, raise it to 70 ℃, and keep the temperature for calcination for 8 hours. After the calcination, stop heating and cool the calcined product to room temperature. And sequentially use 300 mL of dilute hydrochloric acid with a substance concentration of 2.3 ...

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Abstract

The invention relates to the technical field of sodium ion positive electrode materials, and discloses an aluminum isopropoxide coated Na2Mn8O16-carbon nanotube sodium ion positive electrode materialand a preparation method thereof. The material comprises the following formula raw materials: aluminum isopropoxide, Na2Mn8O16 and multi-walled carbon nanotubes. According to the aluminum isopropoxidecoated Na2Mn8O16-carbon nanotube sodium ion positive electrode material and the preparation method thereof, Na2Mn8O16 has excellent electrical conductivity, and Na2Mn8O16 is coated with aluminum isopropoxide to avoid direct contact between Na2Mn8O16 and electrolyte, reduce the electrochemical specific capacity loss of the positive electrode material and improve the electrochemical specific capacity of the positive electrode material. Meanwhile, the aluminum isopropoxide coated Na2Mn8O16 suppresses the Na2Mn8O16 loss and even structural collapse, Na2Mn8O16 is loaded on the surface and the inner wall of hydroxylated multi-walled carbon nanotubes with excellent electrical conductivity to form a stable network skeleton structure and a charge transfer conductive network so as to accelerate themigration and transmission rate of Na + between the positive electrode material and the electrolyte during charging and discharging and effectively prevent the loss of Na +.

Description

technical field [0001] The invention relates to the technical field of sodium ion cathode materials, in particular to an aluminum isopropoxide coated Na 2 mn 8 o 16 -Sodium ion cathode material of carbon nanotubes and its preparation method. Background technique [0002] As a secondary battery, sodium-ion batteries mainly rely on Na + Migrate and transport between the positive and negative electrodes of the battery to work. During the charging and discharging process of the battery, Na + Transport intercalation and migration between positive and negative electrodes, when charging, Na + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the opposite is true during discharge, Na + Deintercalation from the negative electrode and embedding the positive electrode through the electrolyte, sodium-ion batteries have huge potential advantages: sodium salt raw materials are abundant and cheap; + Can migrate and tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/505H01M10/054
CPCH01M4/366H01M4/38H01M4/485H01M4/505H01M10/054Y02E60/10
Inventor 王杰
Owner 王杰
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