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Modified niobium-titanium oxide and preparation method and application thereof

A niobium-titanium oxide and modification technology, which is applied in the field of materials, can solve the problems of insufficient electrochemical performance of batteries, difficulties in the internal diffusion of electrons, low electronic conductivity and ionic conductivity, etc., so as to improve electrochemical performance and shorten the diffusion distance , the effect of reducing the interface resistance

Inactive Publication Date: 2020-09-29
QINGTAO KUNSHAN ENERGY DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned negative electrodes all contain niobium-titanium oxide, but it is difficult for electrons to diffuse on the surface and inside of the niobium-titanium oxide crystal, and the deintercalation of lithium ions is affected, so that the niobium-titanium oxide has the problem of low electronic conductivity and ionic conductivity, which in turn makes Insufficient electrochemical performance of the battery

Method used

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  • Modified niobium-titanium oxide and preparation method and application thereof
  • Modified niobium-titanium oxide and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The preparation method of modified niobium titanium oxide:

[0060] (1) Weigh the raw materials according to the stoichiometric ratio Ti:Nb:Al:Zr=0.95:1.97:0.05:0.03, mix the raw materials with deionized water and add the above raw materials to form Ti 0.95 Nb 1.97 al 0.05 Zr 0.03 o 7 The theoretical weight of 10wt% glucose is placed in a circulating ball mill, ball milled for 10 hours, and the rotation speed is 2800r / min to obtain a uniformly mixed slurry, and the particle size of the slurry is mainly distributed in 40-500nm;

[0061] (2) carry out spray drying to the slurry of step (1), described spray drying is at 250 ℃, and the air inlet velocity is 2.5m 3 / min air intake, 1.5L / h feed rate, 0.5mm diameter nozzle for spray drying to obtain precursor powder;

[0062] (3) heat-treat the precursor powder in a protective atmosphere (mixed gas of hydrogen and argon), heat up to 500°C for 2 hours, and then continue to heat up to 950°C for 10 hours; after heat treatmen...

Embodiment 2

[0066] The preparation method of modified niobium titanium oxide:

[0067] (1) Weigh the raw materials according to the stoichiometric ratio Ti:Nb:Al:Zr=0.98:1.95:0.02:0.05, mix the raw materials with deionized water and add the above raw materials to form Ti 0.98 Nb 1.95 al 0.02 Zr 0.05 o 7 Glucose with a theoretical weight of 15wt% is placed in a circulating ball mill, ball milled for 6 hours, and the rotation speed is 2600r / min to obtain a uniformly mixed slurry, and the particle size of the slurry is mainly distributed in 40-500nm;

[0068] (2) The slurry in step (1) is spray-dried, and the spray-drying is carried out at 250° C. 3 / min air intake, 1.5L / h feed rate, 0.5mm diameter nozzle for spray drying to obtain precursor powder;

[0069] (3) Heat-treat the precursor powder in step (2) under a protective atmosphere (mixed gas of hydrogen and argon), raise the temperature to 600°C for 2 hours, then continue to heat up to 1100°C for 10 hours; cool down after heat trea...

Embodiment 3

[0072] The difference between this example and example 1 is that 26wt% glucose by theoretical weight is added in step (1), other parameters and conditions are exactly the same as those in example 1, and the carbon content is 8.9wt% after cooling after heat treatment.

[0073] The BET specific surface area of ​​the modified niobium titanium oxide obtained in this embodiment is 79m 2 / g; the average particle size of the secondary particles is 17 μm, the average pore size of the porous structure is 27 nm, and the thickness of the C layer is about 9 nm.

[0074] The carbon content in the modified niobium-titanium oxide obtained in this example is significantly higher than that in Example 1. Due to the increase in carbon content, the amount of niobium-titanium oxide as an active material decreases, which in turn affects its energy density and capacity.

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Abstract

The invention relates to a modified niobium-titanium oxide and a preparation method and application thereof. The modified niobium-titanium oxide comprises C and Ti1-zNbx-yAlzZryO7, a surface of Ti1-zNbx-yAlzZryO7 particles is coated with C to form a C layer, the modified niobium-titanium oxide is of a porous structure, interface impedance between a negative electrode obtained by taking the modified niobium-titanium oxide as a negative electrode material and an electrolyte is obviously reduced due to the porous structure coated by the C layer, and meanwhile, the agglomeration growth of negativeelectrode active particles is limited due to the existence of the C layer, so the diffusion distance of lithium ions is shortened, and the electrochemical performance is improved; al and Zr elementsare doped and form a solid solution together with niobium-titanium oxide, so cycle performance and the rate capability of the anode material are improved.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a modified niobium-titanium oxide and its preparation method and application. Background technique [0002] Lithium titanate, as a "zero-strain" material, has a higher lithium-deintercalation potential (1.55V (vs. Li / Li + )), avoiding the safety problems caused by the formation of SEI film and lithium dendrites in the graphite negative electrode due to the low potential. However, the low capacity of lithium titanate (theoretical capacity is 175mAh / g) leads to the low energy density of the full battery, which limits its application. Niobium titanium oxide and lithium titanate have a similar 1-2V lithium deintercalation potential, and have a relatively high High specific capacity (TiNb 2 o 7 The theoretical capacity is 387mAh / g), so the full battery has a higher energy density. However, the low ionic conductivity and electronic conductivity of niobium-titanium oxide limit the improvement...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 冯玉川李峥王丹丹何泓材陈凯周柯杨帆
Owner QINGTAO KUNSHAN ENERGY DEV CO LTD
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