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Sodium-ion battery negative electrode material and preparation method thereof

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of low specific capacity and poor cycle stability of sodium-ion batteries, and achieve the goal of improving battery life. Effect of chemical properties, good cycle life, good mechanical properties

Active Publication Date: 2019-05-14
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low specific capacity and poor cycle stability of existing sodium ion batteries, the present invention provides a negative electrode material for sodium ion batteries and a preparation method thereof

Method used

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  • Sodium-ion battery negative electrode material and preparation method thereof
  • Sodium-ion battery negative electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Preparation of nickel oxide double-layer hollow spheres:

[0025] Dissolve 15g of glucose in 150mL of deionized water, put it in a reaction kettle, and conduct a hydrothermal reaction at 180°C for 3 hours. After the reaction is completed, it is cooled to room temperature. The resulting suspension was centrifuged to collect the product, washed three times with deionized water, and dried at 60°C to obtain carbon sphere powder for future use. Take 1.5g of carbon sphere powder and 1.5g of nickel acetate in 50mL of deionized water, ultrasonically disperse for 30min, stir for 2 hours under magnetic stirring conditions, and then dry in an oven at 60°C. Then the dried product was placed in a tube furnace, and the temperature was raised to 500° C. at a rate of 1° C. / min under air conditions, kept for 1 hour and then cooled with room temperature.

[0026] (2) Preparation of nickel oxide-nickel sulfide composite material:

[0027] Take 0.8 g of nickel oxide double-layer holl...

Embodiment 2

[0033] (1) Preparation of nickel oxide double-layer hollow spheres:

[0034] Dissolve 10 g of glucose in 100 mL of deionized water, place it in a reaction kettle, and conduct a hydrothermal reaction at 180° C. for 2 hours. After the reaction is completed, cool down at room temperature. The resulting suspension was centrifuged to collect the product, washed three times with deionized water, and dried at 60°C to obtain carbon sphere powder for future use. Take 1g of carbon sphere powder and 1g of nickel acetate in 40mL of deionized water, ultrasonically disperse for 30min, stir for 1 hour under magnetic stirring conditions, and then dry in an oven at 60°C. Then the dried product was placed in a tube furnace, and the temperature was raised to 400° C. at a heating rate of 1° C. / min under air conditions, and then cooled with room temperature after keeping the temperature for 1 hour.

[0035] (2) Preparation of nickel oxide-nickel sulfide composite material:

[0036] Take 0.5 g of...

Embodiment 3

[0040] (1) Preparation of nickel oxide double-layer hollow spheres:

[0041] Dissolve 20g of glucose in 200mL of deionized water, put it in a reaction kettle, and conduct a hydrothermal reaction at 200°C for 4 hours. After the reaction is completed, it is cooled to room temperature. The resulting suspension was centrifuged to collect the product, washed three times with deionized water, and dried at 60°C to obtain carbon sphere powder for future use. Take 2g of carbon sphere powder and 2g of nickel acetate in 60mL of deionized water, ultrasonically disperse for 60min, stir for 2 hours under magnetic stirring conditions, and then dry in an oven at 80°C. Then the dried product was placed in a tube furnace, and the temperature was raised to 600° C. at a rate of 2° C. / min under air conditions, kept at room temperature for 2 hours and then cooled.

[0042] (2) Preparation of nickel oxide-nickel sulfide composite material:

[0043] Take 1 g of nickel oxide double-layer hollow sphe...

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Abstract

The invention relates to a sodium-ion battery negative electrode material compounded by a nickel oxide-nickel sulfide composite and graphene and a preparation method thereof. The composite material has a double-layer hollow sphere structure. The preparation process includes the following steps: firstly, preparing a nickel oxide double-layer hollow sphere, partially vulcanizing the hollow sphere toobtain the nickel oxide-nickel sulfide composite, and then compounding the nickel oxide-nickel sulfide composite with graphene to prepare the negative electrode material by using a spray drying method. The composite material of the invention can provide more oxidation active sites, obtains higher specific capacity under high current density, shortens the transmission path of electrons and charges, relieves the expansion of materials during charging and discharging, and achieves good cycle life due to good mechanical properties. According to the scheme of the invention, graphene and the nickeloxide-nickel sulfide hollow sphere are compounded, so that the conductivity of the negative electrode material can be enhanced, the volume expansion of active substances in the charging and discharging process can also be alleviated, and the electrochemical performance of the sodium-ion battery can be improved.

Description

technical field [0001] The technical solution of the present invention relates to a sodium ion battery negative electrode material composed of a nickel oxide-nickel sulfide compound and graphene and a preparation method thereof, in particular to a method of first preparing a nickel oxide double-layer hollow sphere, and then partially sulfiding it The nickel oxide-nickel sulfide composite is obtained and prepared by compounding it with graphene by spray drying, which belongs to the field of material chemistry. Background technique [0002] Among many energy storage devices, lithium-ion batteries have rapidly become an important power source for portable electronic devices due to their high energy density and long cycle life. However, for large-scale energy storage, such as electric vehicles and related applications such as power grids, lithium-ion batteries face great challenges, mainly because lithium reserves are very limited (only 0.002% in the earth's crust), making lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 王新王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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