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Titanium niobate/carbon composite electrode material and preparation method thereof

An electrode material and carbon composite technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low conductivity and low rate performance, and achieve the effects of improving conductivity, convenient operation, and simple preparation process

Inactive Publication Date: 2016-05-04
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, this application is aimed at TiNb 6 o 17 Due to the low rate performance of the material due to its low electrical conductivity, a titanium niobate / carbon composite electrode material and its preparation method are provided. excellent

Method used

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  • Titanium niobate/carbon composite electrode material and preparation method thereof
  • Titanium niobate/carbon composite electrode material and preparation method thereof
  • Titanium niobate/carbon composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a. Weigh rutile titanium dioxide and niobium pentoxide according to the atomic ratio Ti:Nb=1:5.88, and then weigh a certain amount of citric acid, wherein the quality of citric acid is 5% of the total mass of carbon dioxide and niobium oxide, These three substances are placed in a ball mill tank, and ethanol is used as a dispersion medium, and ball milled on a ball mill at 600 rpm for 24 hours to fully mix the raw materials;

[0031] b. drying the mixture obtained in step a at 71° C. to obtain a precursor;

[0032] c. Calcining the precursor obtained in step b at 1300° C. for 52 hours under the protection of argon, and naturally cooling down to room temperature to obtain titanium niobate / carbon composite electrode material.

[0033] The experimental result of the titanium niobate / carbon composite electrode material that embodiment 1 prepares is as follows Figure 1-Figure 4 shown.

[0034] figure 1 The XRD figure of the titanium niobate / carbon composite electrode mat...

Embodiment 2

[0039] a, take by weighing rutile type titanium dioxide and niobium dioxide by atomic ratio Ti:Nb=1:6.35, then take by weighing a certain amount of acetylene black, wherein, the quality of acetylene black is 2% of the total mass of carbon dioxide and niobium oxide, will These three kinds of materials are placed in the ball mill tank, with ethanol as the dispersion medium, on the ball mill with 280 rpm ball mill for 19 hours, the raw materials are fully mixed;

[0040] b. drying the mixture obtained in step a at 78° C. to obtain a precursor;

[0041] c. Calcining the precursor obtained in step b at 950° C. for 35 hours under the protection of nitrogen, and naturally cooling down to room temperature to obtain the titanium niobate / carbon composite electrode material.

Embodiment 3

[0043] a. Weigh anatase titanium dioxide and NiO3 according to the atomic ratio Ti:Nb=1:6.16, and then weigh a certain amount of graphite, wherein the mass of graphite is 13% of the total mass of carbon dioxide and niobium oxide, These three substances are placed in a ball mill tank, and ethanol is used as a dispersion medium, and ball milled on a ball mill at 320 rpm for 20 hours to fully mix the raw materials;

[0044] b. drying the mixture obtained in step a at 90° C. to obtain a precursor;

[0045] c. Calcining the precursor obtained in step b at 1190° C. for 39 hours under the protection of nitrogen, and naturally cooling down to room temperature to obtain titanium niobate / carbon composite electrode material.

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Abstract

The invention discloses a preparation method of a titanium niobate / carbon composite electrode material belonging to the lithium ion battery material technical field. According to the method, ball mill mixing is carried out to titanium dioxide, niobium oxide and carbon source according to a certain proportion; the dried mixture is calcined under the protection of an inert gas, thus obtaining the titanium niobate / carbon composite electrode material. The invention also discloses the titanium niobate / carbon composite electrode material prepared by the preparation method. According to the invention, the conductivity of the material is improved through carbon coverage; meanwhile, a certain inhibiting effect on the particle size increasing phenomenon of the titanium niobate is realized through carbon coverage; the material shows excellent rate capability and cycle performance when being used as the lithium ion battery anode material; in addition, the material and the preparation method of the invention are featured by simple preparation technology, convenient operation and low production cost and are easy in large-scale industrial production.

Description

technical field [0001] The application belongs to the field of lithium ion battery materials, and in particular relates to a titanium niobate / carbon composite electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, digital cameras and other electronic products, and are currently being extended to electric tools, electric vehicles, grid energy storage and other fields, which requires lithium-ion batteries to have high energy density, power density and safety. The current commercial lithium-ion battery anode materials are mainly graphite-based carbon materials. Although they have good cycle performance and low price, due to their low lithium intercalation potential, it is easy to cause serious damage during high-current charging and discharging or overcharging. Security issues. In addition, the rate performance of carbon materials is poor, and fast charging and discharging cannot be performed. ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 刘光印张瑞雪郭佳莉赵强柳文敏杨浩包晓玉鲍克燕季晓广
Owner NANYANG NORMAL UNIV
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