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Preparation method for carbon-coated modified high-multiplying-power titanium-niobium oxide material

A titanium-niobium oxide, high-rate technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of low ionic conductivity and electrochemical performance, improve electrochemical performance and reduce primary particle size , The effect of increasing the specific surface area

Inactive Publication Date: 2019-03-15
河南卓谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the crystal structure of titanium niobium oxide is very favorable for Li ＋ However, the problem of low electronic conductivity and ionic conductivity still seriously limits the improvement of its electrochemical performance, so improving the kinetic properties of titanium niobium oxide electrode materials is still a serious challenge.

Method used

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  • Preparation method for carbon-coated modified high-multiplying-power titanium-niobium oxide material
  • Preparation method for carbon-coated modified high-multiplying-power titanium-niobium oxide material
  • Preparation method for carbon-coated modified high-multiplying-power titanium-niobium oxide material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the carbon-coated modified high-magnification titanium-niobium oxide material in this embodiment is as follows:

[0024] Add 7.5 g of titanium dioxide, 26.5 g of niobium pentoxide, and 0.5 g of glucose into 100 g of deionized water one by one, and stir evenly to obtain a mixed solution A.

[0025] Mixture A was ball milled at 600 r / min for 48 h, and then spray-dried and granulated at an inlet temperature of 260 °C and an outlet temperature of 60 °C. The spray-dried material was pre-sintered at 500 °C for 6 h in a nitrogen atmosphere, and then calcined at 800 °C for 20 h to obtain a carbon-coated modified high-magnification titanium-niobium oxide material C@TiNb 2 o 7 .

[0026] Using the scheme of Example 1, three experiments were conducted in parallel, and the obtained products were numbered A, B, and C respectively, and CR2032-type simulated batteries were produced, and the capacity was tested. The test results are shown in Table 1.

[002...

Embodiment 2

[0031] The preparation method of the carbon-coated modified high-magnification titanium-niobium oxide material in this embodiment is as follows:

[0032]Add 34.0 g of tetra-n-butyl titanate, 135.1 g of niobium pentachloride, and 1.2 g of polyethylene glycol into 200 g of deionized water one by one, and stir evenly to obtain a mixed solution A.

[0033] Mixture A was ball milled at 1200 r / min for 24 h, and then spray-dried and granulated at an inlet temperature of 300 °C and an outlet temperature of 100 °C. The spray-dried material was pre-sintered at 550 °C for 2 h in a nitrogen atmosphere, and then calcined at 1300 °C for 8 h to obtain a carbon-coated modified high-magnification titanium-niobium oxide material C@Ti 2 Nb 10 o 29 .

Embodiment 3

[0035] The preparation method of the carbon-coated modified high-magnification titanium-niobium oxide material in this embodiment is as follows:

[0036] 28.4 g of tetraisopropyl titanate, 107.6 g of niobium oxalate hydrate, and 2.0 g of polyvinylpyrrolidone were successively added to 200 g of deionized water and stirred evenly to obtain a mixed solution A.

[0037] Mixture A was ball milled at 800 r / min for 36 h, and then spray-dried and granulated at an inlet temperature of 280 °C and an outlet temperature of 80 °C. The spray-dried material was pre-sintered at 520 °C for 3 h in a nitrogen atmosphere, and then calcined at 900 °C for 15 h to obtain a carbon-coated modified high-magnification titanium-niobium oxide material C@TiNb 2 o 7 .

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Abstract

The invention provides a preparation method for a carbon-coated modified high-multiplying-power titanium-niobium oxide material. A titanium source, a niobium source and a carbon source are added intodeionized water, and after high-energy grinding is carried out, drying and sintering are carried out to prepare the high-multiplying-power titanium-niobium oxide material. Compared with the prior art,the carbon-coated modified high-multiplying-power titanium-niobium oxide material structurally contains similar titanium-niobium oxide intercalated with lithium potential than lithium titanate materials and graphite materials, and is more expected to become a future popular negative electrode material. Under an acidic condition, the carbon-coated modified high-multiplying-power titanium-niobium oxide material has particular chemical stability, discharge potential is 1-2V, in addition, the specific capacity / capacitance of the carbon-coated modified high-multiplying-power titanium-niobium oxide material is higher than that of the lithium titanate and the graphite material, the carbon-coated modified high-multiplying-power titanium-niobium oxide material exhibits good performance on the aspects of multiplying-power performance and cycle performance, and therefore, the carbon-coated modified high-multiplying-power titanium-niobium oxide material is ever considered as a potential negativeelectrode material. Through nanocrystallization mechanical grinding and carbon-coated modification, the electron conduction rate and the lithium ion transmission capability of the titanium-niobium oxide material can be effectively improved so as to improve the circulation and multiplying-power performance of the lithium ion battery, and the initial Coulomb efficiency of the lithium ion battery isimproved.

Description

technical field [0001] The invention relates to the technical field of material synthesis, in particular to a method for preparing a carbon-coated modified high-magnification titanium-niobium oxide material. Background technique [0002] At present, lithium-ion batteries have been widely used in energy storage systems and electric vehicles. Among them, the negative electrode materials of commercially applied lithium-ion batteries mainly include carbon materials and lithium titanate materials (Li 4 Ti 5 o 12 ). As the negative electrode of lithium batteries, carbon materials have relatively poor electrochemical kinetic performance under high power, and at the same time, lithium dendrites are easy to form, causing serious safety problems. In order to overcome these defects, lithium titanate material has been extensively studied as an alternative product of negative electrode materials. Since the lithium titanate material has a relatively high working potential of about 1.5...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 陈垒李光张晓峰杨智雄陈小梅尚伶俐郭恒
Owner 河南卓谷科技有限公司
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