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TiNb2O7 material with preferential growth of (010) crystal face and preparation method and application of TiNb2O7 material

A technology of crystal plane and solvent, applied in the field of TiNb2O7 material and its preparation, can solve the problems of short lithium ion migration distance, difficult mass production, complicated process, etc., and achieve low cost, high compaction density and volume energy density, process simple effect

Active Publication Date: 2021-08-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the improvement requirements of the prior art, the present invention provides a TiNb with preferential growth of (010) crystal plane 2 o 7 The preparation method of the material, the material grows preferentially along the (010) crystal plane, the migration distance of lithium ions is short, and lithium ions can migrate rapidly along the crystallographic direction, so the material has a high specific capacity as a negative electrode material for lithium ion batteries and excellent rate performance, the purpose of which is to obtain high rate performance TiNb 2 o 7 At the same time, it avoids the problems of complex process, high cost, and difficulty in large-scale production brought about by material preparation processes such as nanonization, porous structure design, and surface modification.

Method used

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  • TiNb2O7 material with preferential growth of (010) crystal face and preparation method and application of TiNb2O7 material
  • TiNb2O7 material with preferential growth of (010) crystal face and preparation method and application of TiNb2O7 material
  • TiNb2O7 material with preferential growth of (010) crystal face and preparation method and application of TiNb2O7 material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh 7.986g TiO 2 Dissolve in 50mL water, stir well, then weigh 35.588g Nb(OH) 5 Added to the above solution and vigorously stirred for 1 hour, and the obtained suspension was air-dried at 150° C. for 12 hours to obtain a precursor powder. The obtained dry precursor powder is placed in a vibrating sieve, and the powder passing through the vibrating sieve is collected for future use.

[0039] (2) The obtained powder was placed in a muffle furnace, under a pure oxygen atmosphere, the temperature was gradually raised to 1000° C. at 5° C. / min and kept for 10 hours.

[0040] (3) Subsequently, the temperature is lowered from 1000°C to 300°C at a cooling rate of 0.5°C / min, and then naturally cooled to room temperature to obtain TiNb grown on the (010) crystal plane 2 o 7 .

[0041] figure 1 It is the TiNb prepared in Example 1 2 o 7 X-ray diffraction pattern of . From figure 1 It can be seen that the diffraction characteristic peaks appearing in the sample are al...

Embodiment 2

[0048] (1) Weigh 79.86g TiO 2 Place in 100mL absolute ethanol, then weigh 265.81g Nb 2 o 5 Add to the above mixture and stir evenly, then planetary ball mill for 10 hours, freeze-dry the obtained mixture for 24 hours to obtain precursor powder, solid-phase ball mill the obtained dry precursor powder for 1 hour again, and collect the powder for later use.

[0049] (2) The obtained powder was placed in a muffle furnace, under a 50% oxygen atmosphere, the temperature was gradually raised to 1300° C. at 3° C. / min and kept for 24 hours.

[0050] (3) Subsequently, the temperature is lowered from 1300°C to 600°C at a cooling rate of 5°C / min, and then naturally cooled to room temperature to obtain TiNb dominated by crystallographic (010) crystal planes 2 o 7 .

[0051] Figure 7 Is the TiNb prepared in Example 2 2 o 7 The rate performance diagram of the coin full battery test prepared as the negative electrode active material and the commercial lithium iron phosphate pole piece...

Embodiment 3

[0053] (1) Weigh 39.93g TiO 2 Placed in 50mL absolute ethanol, then weighed 132.91g Nb 2 o 5 Add to the above mixture and stir evenly, then planetary ball mill for 5 hours, freeze-dry the obtained mixture for 24 hours to obtain precursor powder, solid phase ball mill the obtained dry precursor powder for 1 hour again, collect the powder for later use.

[0054] (2) The obtained powder was placed in a muffle furnace, under a 50% oxygen atmosphere, the temperature was gradually raised to 1100° C. at 3° C. / min and kept for 24 hours.

[0055] (3) Subsequently, the temperature was lowered from 1100°C to 500°C at a cooling rate of 2°C / min, and then naturally cooled to room temperature to obtain TiNb dominated by crystallographic (010) crystal planes 2 o 7 .

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a TiNb2O7 material with preferential growth of a (010) crystal face and a preparation method and application of the TiNb2O7 material. The preparation method comprises the following steps: (1) dispersing a niobium source and a titanium source into a solvent, performing uniform mixing, performing drying, and removing the solvent to obtain a precursor; (2) performing heat treatment on the precursor in an oxygen-containing atmosphere to obtain an intermediate; (3) cooling the intermediate to a tempering temperature according to a set cooling rate, and then performing natural cooling to room temperature to obtain the TiNb2O7 material with preferential growth of the (010) crystal face. The TiNb2O7 material prepared by the method preferentially grows along the (010) crystal face, the migration distance of lithium ions is short, the lithium ions can rapidly migrate along the crystallographic direction, and the TiNb2O7 material has high specific capacity, excellent rate capability and small specific surface area; and when the material is used as a negative electrode of a lithium ion battery, high electrode compaction density and volume energy density can be obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, in particular to a TiNb with preferential growth of (010) crystal plane 2 o 7 Materials and their preparation methods and applications. Background technique [0002] Lithium-ion batteries (LIBs), as one of the most widely used energy storage systems, have been widely used in consumer electronics in the past two decades, and their application has expanded to electric vehicles (EVs), hybrid vehicles ( HEVs), grid energy storage and other emerging fields. The negative electrode is one of the key components of the battery. At present, most commercial lithium-ion batteries use graphite-like carbon materials as negative electrodes. Lithium ion migration rate in graphite materials is slow, the working voltage is low (-0.1V, close to the potential of lithium analysis), and there are poor charge and discharge rate performance and fast charge, Problems such as poor working safety ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/58H01M10/0525
CPCH01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 孙永明詹仁明
Owner HUAZHONG UNIV OF SCI & TECH
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