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Carbon-coated NiTiO3/CNT negative electrode material, preparation method and application

A negative electrode material and carbon coating technology, which is applied in the field of sodium ion battery negative electrode material preparation, can solve the problems of less research on sodium ion battery negative electrode materials, inability to meet high specific capacity materials, volume expansion, etc., and achieves broad industrial application prospects, good Effect of rate capability and cycle stability, high tap density

Active Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, researchers pay more attention to the development and research of anode materials for sodium-ion batteries, and there are relatively few studies on anode materials for sodium-ion batteries.
In the existing negative electrode system, carbon materials have good cycle performance, but their specific capacity is low, which cannot meet the needs of high specific capacity materials
Although the alloy compound has a high discharge specific capacity, there is a serious volume expansion problem in the process of intercalation of sodium.

Method used

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  • Carbon-coated NiTiO3/CNT negative electrode material, preparation method and application
  • Carbon-coated NiTiO3/CNT negative electrode material, preparation method and application
  • Carbon-coated NiTiO3/CNT negative electrode material, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Multi-walled carbon nanotubes (1-2um in length and 60-100nm in diameter) were treated in 8M concentrated nitric acid solution for 12h, then ultrasonically washed with absolute ethanol and deionized water for 30min, filtered and dried for later use.

[0069] Add 75 mg of acid-treated carbon nanotubes to 50 mL of absolute ethanol, and ultrasonically treat for 30 minutes to obtain a suspension of carbon nanotubes. Then, 500 mg of PVP (molecular weight: 10100) and 4.5 mL of tetrabutyl titanate were sequentially added to the carbon nanotube suspension, and stirred thoroughly for 1 h to obtain a mixed suspension. 3.291 g of nickel acetate tetrahydrate (titanium / nickel molar ratio 1:1) was dissolved in 30 mL of deionized water to obtain a nickel acetate solution. It was slowly added dropwise to the above mixed suspension, and after continuous stirring for 4 hours, it was transferred to an autoclave and reacted at 200°C for 18 hours. The reaction precipitate was repeatedly was...

Embodiment 2

[0076] Take 75 mg of carbon nanotubes that have been acid-treated in advance (see Example 1 for the treatment method), add them to 50 mL of absolute ethanol, and perform ultrasonic treatment for 30 minutes to obtain a suspension of carbon nanotubes. Then, 600 mg of PVP (molecular weight: 10100) and 4.5 mL of tetrabutyl titanate were sequentially added to the carbon nanotube suspension, and stirred thoroughly for 1 h to obtain a mixed suspension. 3.291 g of nickel acetate tetrahydrate (titanium / nickel molar ratio 1:1) was dissolved in 40 mL of deionized water to obtain a nickel acetate solution. It was slowly added dropwise to the above mixed suspension, and after continuous stirring for 4 hours, it was transferred to an autoclave and reacted at 200°C for 18 hours. The reaction precipitate was repeatedly washed with absolute ethanol and deionized water, filtered three times, then vacuum-dried at 60°C for 12 hours, and finally the material was placed in a tube furnace for heat t...

Embodiment 3

[0079]Take 70 mg of carbon nanotubes that have been acid-treated in advance (see Example 1 for the treatment method), add them to 50 mL of absolute ethanol, and ultrasonicate for 30 minutes to obtain a suspension of carbon nanotubes. Then, 500 mg of PVP (molecular weight: 10100) and 3.5 mL of tetrabutyl titanate were sequentially added to the carbon nanotube suspension, and fully stirred for 2 hours to obtain a mixed suspension. 2.559 g of nickel acetate tetrahydrate (titanium / nickel molar ratio 1:1) was dissolved in 30 mL of deionized water to obtain a nickel acetate solution. It was slowly added dropwise to the above mixed suspension, and after continuous stirring for 3 hours, it was transferred to an autoclave and reacted at 200°C for 18 hours. The reaction precipitate was repeatedly washed with absolute ethanol and deionized water, filtered three times, then vacuum-dried at 60°C for 12 hours, and finally the material was placed in a tube furnace for heat treatment under an...

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Abstract

The invention discloses a carbon-coated NiTiO3 / CNT negative electrode material. Carbon-coated nickel titanate nano-particles grow on the surface of a carbon nano tube in situ. The invention further discloses a preparation method of the carbon-coated NiTiO3 / CNT negative electrode material. The preparation method includes the steps of dissolving and / or dispersing the carbon nano tube, a titanium source, a nickel and an organic carbon source in a solvent, mixing with stirring to obtain a mixed solution; subjecting the mixed solution to hydrothermal reaction, solid-liquid separation and washing to obtain a coated precursor; subjecting the coated precursor to thermal treatment to obtain the carbon-coated NiTiO3 / CNT negative electrode material. The invention further discloses application of the carbon-coated NiTiO3 / CNT negative electrode material in a sodium-ion battery. The carbon-coated NiTiO3 / CNT negative electrode material is excellent in electrical properties, simple in preparation process, low in cost and wide in industrial application prospect.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for sodium ion batteries, in particular to a carbon-coated nickel titanate (NiTiO 3 ) / carbon nanotube (CNT) composite anode material, preparation method and application thereof as anode material for sodium ion battery. Background technique [0002] The development and utilization of traditional petrochemical energy has made global climate and environmental problems rampant. The development of new energy is an effective way to solve this problem and has received strong support from governments. New energy sources such as wind energy, tidal energy, water energy, and solar energy are uninterrupted, so an efficient energy storage system must be developed to maintain the stability of the power grid. After rapid development in recent years, lithium-ion batteries have been widely used in consumer electronics products, new energy vehicles, new energy rail transit and other field...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M10/054
CPCH01M4/131H01M4/362H01M4/483H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 张治安李煌旭宋俊肖李军明陈晓彬
Owner CENT SOUTH UNIV
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