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Lithium titanate nitride-aluminum oxide nitride composite material and preparation method and application thereof

A technology of nitriding aluminum oxide and lithium titanate, which is applied in the direction of electrochemical generators, active material electrodes, structural parts, etc., can solve the problems of safety performance, poor electronic conductivity and large rate performance, and achieve high rate performance Good, the transmission channel is smooth, and the effect of improving electronic conductance

Active Publication Date: 2019-02-15
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above deficiencies in the prior art, the object of the present invention is to provide a lithium titanate nitride-aluminum oxide nitride composite material and its preparation method and application, aiming to solve the problem of safety performance and electronic conductivity of existing lithium titanate materials. The problem of poor stability and high magnification performance

Method used

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  • Lithium titanate nitride-aluminum oxide nitride composite material and preparation method and application thereof
  • Lithium titanate nitride-aluminum oxide nitride composite material and preparation method and application thereof
  • Lithium titanate nitride-aluminum oxide nitride composite material and preparation method and application thereof

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Effect test

Embodiment 1

[0040](1) Weigh anhydrous lithium acetate, tetrabutyl titanate, aluminum nitrate with a molar ratio of Li:Ti:Al=0.84:1:0.05, use ethanol as a dispersant, and anhydrous lithium acetate and tetrabutyl titanate Dissolve butyl ester in ethanol respectively, prepare lithium acetate solution and tetrabutyl titanate solution respectively, disperse aluminum nitrate in lithium acetate solution; Mix the lithium solution, then add an equal volume of acetic acid, stir at 80°C for 6 hours, and dry at 120°C; disperse in deionized water to form a suspension, and spray dry the suspension with a hot air temperature of 140°C to obtain lithium acid - Alumina precursors.

[0041] (2) Put the lithium titanate-alumina precursor in a sintering furnace, heat up to 600°C at 5°C / min in the air, calcinate at 600°C for 8 hours, cool naturally to room temperature, grind, and pass through a 150-mesh sieve to obtain The nano lithium titanate-alumina composite powder is a nano material.

[0042] (3) Put th...

Embodiment 2

[0046] (1) Weigh anhydrous lithium acetate, tetrabutyl titanate, and alumina at a molar ratio of Li:Ti:Al=0.86:1:0.1, use ethanol as a dispersant, and anhydrous lithium acetate and tetrabutyl titanate Dissolve the esters in ethanol respectively, prepare lithium acetate solution and tetrabutyl titanate solution respectively, and disperse aluminum oxide in the lithium acetate solution; mix tetrabutyl titanate solution and lithium acetate solution containing aluminum oxide under stirring condition Mix, then add an equal volume of acetic acid, stir at a constant temperature for 8 hours at 80°C, and dry at 120°C; then disperse in deionized water to form a suspension, and spray dry the suspension. The temperature of the hot air is At 140°C, the lithium acid-alumina precursor was prepared.

[0047] (2) Put the lithium titanate-alumina precursor in a sintering furnace, heat up to 500°C at 5°C / min in the air, calcinate at 500°C for 6h, cool naturally to room temperature, grind, and pas...

Embodiment 3

[0052] (1) Li:Ti:Al=0.78:1:0.15 by molar ratio, weigh lithium acetate, tetrabutyl titanate, aluminum nitrate, use ethanol as dispersant, dissolve lithium acetate and tetrabutyl titanate in Ethanol, prepare lithium acetate solution and tetrabutyl titanate solution respectively, disperse aluminum nitrate in lithium acetate solution, mix tetrabutyl titanate solution and lithium acetate solution containing aluminum nitrate under stirring condition, then add etc. volume of acetic acid, stirred at 80°C for 4 hours, and then dried at 120°C; dispersed in deionized water to form a suspension, and spray-dried the suspension with a hot air temperature of 140°C to obtain lithium titanate-oxidized Aluminum precursor.

[0053] (2) Put the lithium titanate-alumina precursor in a sintering furnace, raise the temperature to 800°C at 5°C / min in the air, calcinate at 800°C for 4 hours, cool naturally to room temperature, grind, and pass through a 150-mesh sieve, that is Lithium titanate-alumina...

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Abstract

The invention discloses a lithium titanate nitride- aluminum oxide nitride composite material and a preparation method and application thereof. The method comprises the steps of: respectively dissolving a lithium source and a titanium source in ethanol to obtain lithium source solution and titanium source solution; adding an aluminum source to the lithium source solution and mixing with with the titanium source solution, then adding acetic acid to carrying out stirring at 40 to 100 DEG C for 4 to 10 hours, carrying out drying at 80 to 120 DEG C, carrying out dispersion in deionized water, andcarrying out spray drying to obtain a lithium titanate-aluminum oxide precursor; carrying out calcination in air at 400-900 DEG C for 4-18 h, and carrying out cooling and grinding to obtain lithium titanate-aluminun oxide composite powder; heating to 500-1000 DEG C in a protective atmosphere, and maintaining the temperature in a nitrogen-containing atmosphere for 0.5-2 h so as to obtain the lithium titanate nitride-aluminum oxide nitride composite material. The prepared composite material has good large rate performance, good safety performance and high specific capacity, and can be widely applied to lithium ion batteries and super capacitors required for various portable electronic devices and various electric vehicles.

Description

technical field [0001] The invention relates to the field of lithium-ion secondary battery electrode materials, in particular to a nitrided lithium titanate-nitrided aluminum oxide composite material and a preparation method and application thereof. Background technique [0002] Lithium titanate battery has been widely used as a portable new energy source in many electronic product fields due to its safety, long service life, and portability. At present, the key research direction of anode materials for lithium-ion batteries is developing in the direction of power battery materials with high specific capacity, high rate, high cycle performance and high safety performance. Traditional carbon materials are the earliest and most used negative electrode materials due to their low rate performance and good cycle performance; however, the theoretical capacity of carbon materials is low (372mAh / g), and dendrites are easily formed at low voltages, causing battery internal damage. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/624H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 李瑛俞兆喆田冰冰苏陈良魏堃
Owner SHENZHEN UNIV