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Preparation method of lithium ion battery negative material titanium niobate

A technology for lithium ion batteries and negative electrode materials, applied in the field of electrochemistry, can solve the problems affecting the electrochemical performance of titanium niobate materials, long diffusion distance, large particles of titanium niobate materials, etc., and achieves convenient industrial production, simple steps, and easy effect of operation

Inactive Publication Date: 2016-06-01
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, what the present invention is to solve is that the titanium niobate material particles obtained by the existing preparation method are relatively large, and the diffusion distance is long, which affects the electrochemical performance of the titanium niobate material.

Method used

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  • Preparation method of lithium ion battery negative material titanium niobate
  • Preparation method of lithium ion battery negative material titanium niobate
  • Preparation method of lithium ion battery negative material titanium niobate

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1) Dissolve niobium ethoxide and butyl titanate in a certain amount of acetic acid according to the atomic ratio niobium / titanium=5.82:1, and then mix slowly, where the niobium ion concentration is 0.02mol / L;

[0033] 2) Transfer the mixture obtained in step 1) to the reaction kettle, place it in a constant temperature drying oven, and react at 160°C for 48 hours;

[0034] 3) Naturally cool to room temperature, wash the obtained precipitate with deionized water and ethanol three times, and then dry at 73°C to obtain a powder;

[0035] 4) The powder obtained in step 3) is fired at 1100°C for 12 hours to obtain titanium niobate (TiNb 6 O 17 )material.

Embodiment 2

[0037] 1) Dissolve niobium pentachloride and titanium sulfate in a certain amount of acetic acid according to the atomic ratio niobium / titanium=5.63:1, and then slowly mix them, where the niobium ion concentration is 1.1mol / L;

[0038] 2) Transfer the mixture obtained in step 1) to the reaction kettle, place it in a constant temperature drying oven, and react at 245°C for 36 hours;

[0039] 3) Naturally cool to room temperature, wash the obtained precipitate with deionized water and ethanol three times, and then dry at 80°C to obtain a powder;

[0040] 4) The powder obtained in step 3) is calcined at 830°C for 24 hours to obtain titanium niobate (TiNb 6 O 17 )material.

Embodiment 3

[0042] 1) Dissolve niobium ethoxide and titanium tetraisopropoxide in a certain amount of acetic acid according to the atomic ratio niobium / titanium=5.2:1, and then slowly mix, where the niobium ion concentration is 0.002mol / L;

[0043] 2) Transfer the mixture obtained in step 1) to the reaction kettle, place it in a constant temperature drying oven, and react at 60°C for 48 hours;

[0044] 3) Naturally cool to room temperature, wash the obtained precipitate with deionized water and ethanol three times, and then dry at 111°C to obtain a powder;

[0045] 4) The powder obtained in step 3) is fired at 500°C for 48 hours to obtain titanium niobate (TiNb 6 O 17 )material.

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Abstract

The invention discloses a preparation method of lithium ion battery negative material titanium niobate. The preparation method comprises the following steps: separately dissolving a niobium source and a titanium source into acetic acid, and slowly mixing the niobium source and the titanium source; loading a mixed solution obtained in the previous step into a reaction kettle, and heating to facilitate the reaction; after the reaction kettle is naturally cooled to the room temperature, washing obtained precipitates for multiple times by separately utilizing deionized water and ethanol, and drying in a vacuum drying oven to obtain powder; and roasting the obtained powder to obtain titanium niobate. The preparation method is moderate in conditions, simple in procedures, easy to operate and convenient in industrialized production. The prepared titanium niobate material is in a spherical shape and is relatively small in size, so that the diffusion speed of lithium ions in the material is increased; and when the prepared titanium niobate material is used as a lithium ion battery negative electrode, the charging-discharging specific capacity is relatively high, and the multiplying power cycling performance is excellent.

Description

Technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a preparation method of titanium niobate, which is a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, high energy density, long service life and environmental protection, and are widely used in various portable electronic products. With the development of the electric vehicle and hybrid vehicle industry, higher requirements are put forward for lithium-ion batteries, especially in terms of safety, charging speed and cruising range. The current commercial lithium-ion battery anode materials are still limited to graphite-like carbon materials, and their lower safety and rate performance cannot meet the requirements of power batteries for electric vehicles. Therefore, there is an urgent need to develop new high-performance anode materials. [0003] Titanium Niobate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/48H01M4/1391
CPCH01M4/1391H01M4/483H01M10/0525Y02E60/10
Inventor 刘光印魏铭刘小娣赵强孙瑞雪谢海泉包晓玉郭佳莉季晓广
Owner NANYANG NORMAL UNIV
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