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Carbon nanotube and tin dioxide modified titanium carbide lithium ion battery negative electrode material with three-dimensional 'plane-line-plane' structure and preparation method thereof

A technology of carbon nanotubes and tin dioxide, applied in battery electrodes, secondary batteries, structural parts, etc., to achieve the effect of improving electrochemical performance, excellent electrochemical performance, and improving surface-to-surface contact

Inactive Publication Date: 2018-02-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Through document retrieval, the present invention is aimed at Ti 3 C 2 T x Using CNT and SnO 2 Modification to improve electrochemical performance has not been reported publicly

Method used

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  • Carbon nanotube and tin dioxide modified titanium carbide lithium ion battery negative electrode material with three-dimensional 'plane-line-plane' structure and preparation method thereof
  • Carbon nanotube and tin dioxide modified titanium carbide lithium ion battery negative electrode material with three-dimensional 'plane-line-plane' structure and preparation method thereof
  • Carbon nanotube and tin dioxide modified titanium carbide lithium ion battery negative electrode material with three-dimensional 'plane-line-plane' structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1 g Ti 3 AlC 2 The powder was dispersed into 20 ml of hydrofluoric acid solution with a mass fraction of 50%, and stood at room temperature for 24 hours, and then the precipitate was centrifuged with distilled water for 5 times until the pH of the solution was 5. The precipitate was put into a vacuum drying oven and dried at 80° C. for 12 hours to obtain a black powder. 0.113 g of SnCl 2 Dissolve in 25 mL of distilled water, then add the resulting black powder to SnCl 2 The solution was stirred at room temperature for 3 hours, and ultrasonic oscillation was continued for 30 minutes to obtain a black suspension. Put the black suspension into a reaction kettle with a polytetrafluoroethylene liner, then put the reaction kettle into an oven, and keep the temperature at 130°C for 5 hours. After natural cooling, wash the precipitate in the reaction kettle with distilled water three times, put the precipitate in a drying oven, and dry it at 80°C for 12 hours, then grind it...

Embodiment 2

[0043] 1 g Ti 3 AlC 2 The powder was dispersed into 20 ml of hydrofluoric acid solution with a mass fraction of 50%, and stood at room temperature for 24 hours, and then the precipitate was centrifuged with distilled water for 5 times until the pH of the solution was 5. The precipitate was put into a vacuum drying oven and dried at 80° C. for 12 hours to obtain a black powder. 0.564 g of SnCl 2 Dissolve in 25 mL of distilled water, then add the resulting black powder to SnCl 2 The solution was stirred at room temperature for 3 hours, and ultrasonic oscillation was continued for 30 minutes to obtain a black suspension. Put the black suspension into a reaction kettle with a polytetrafluoroethylene liner, then put the reaction kettle into an oven, and keep the temperature at 130°C for 5 hours. After natural cooling, wash the precipitate in the reaction kettle with distilled water three times, put the precipitate in a drying oven, and dry it at 80°C for 12 hours, then grind it...

Embodiment 3

[0046] 1 g Ti 3 AlC 2The powder was dispersed into 20 ml of hydrofluoric acid solution with a mass fraction of 50%, and stood at room temperature for 24 hours, and then the precipitate was centrifuged with distilled water for 5 times until the pH of the solution was 5. The precipitate was put into a vacuum drying oven and dried at 80° C. for 12 hours to obtain a black powder. 2.821 g of SnCl 2 Dissolve in 25 mL of distilled water, then add the resulting black powder to SnCl 2 The solution was stirred at room temperature for 3 hours, and ultrasonic oscillation was continued for 30 minutes to obtain a black suspension. Put the black suspension into a reaction kettle with a polytetrafluoroethylene liner, then put the reaction kettle into an oven, and keep the temperature at 130°C for 5 hours. After natural cooling, wash the precipitate in the reaction kettle with distilled water three times, put the precipitate in a drying oven, and dry it at 80°C for 12 hours, then grind it ...

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Abstract

The invention discloses a carbon nanotube and tin dioxide modified titanium carbide lithium ion battery negative electrode material with three-dimensional 'plane-line-plane' structure and a preparation method thereof. Titanium aluminide carbide, stannous chloride, CNT (carbon nanotube) and the like are used as raw materials, the concentration of a SnCl2 solution is controlled to be 0.02-0.5mol / l,the mass percentage in a composite material is 10%, and a hydrothermal reaction condition is carrying out heat preservation at 130 DEG C or 190 DEG C for 5 hours. The high capacity of SnO2 increases the lithium ion intercalation capacity of Ti3C2Tx, the CNT not only inhibits the capacity attenuation of SnO2 in charging and discharging, but also bridges a discontinuous two-dimensional layered structure of Ti3C2Tx into a complete three-dimensional 'plane-line-plane' structure to form a continuous conductive network, and a surface-to-surface contact condition of the Ti3C2Tx interlayer structure is improved to obtain a lithium ion battery negative electrode material with excellent electrochemical performance. The method provided by the invention is a modification method with a simple process and a low cost, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, in particular to a carbon nanotube (CNT) and tin dioxide (SnO 2 ) modified titanium carbide (Ti 3 C 2 T x ) composite material and its preparation method. Background technique [0002] Lithium-ion batteries have become one of the most concerned energy storage devices in recent years due to their light weight, small size, good safety, high operating voltage, high energy density, and long service life. Lithium-ion battery anode materials are an important part of lithium-ion batteries, and the composition and structure of anode materials have a decisive impact on the electrochemical performance of lithium-ion batteries. [0003] Carbon is an element that exists widely in nature. Its preparation method is simple, its sources are extensive, its structure is complex, and its types are diverse. Carbon-based materials used as anode materials for lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/387H01M4/58H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 郭瑞松刘志超李福运郑梅王宝玉厉婷婷罗亚妮董琳琳
Owner TIANJIN UNIV
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