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Lithium titanate composite material and preparation method thereof

A composite material, lithium titanate technology, applied in the direction of titanate, titanium compound, alkali metal titanate, etc., can solve the problem of not taking into account the high initial discharge specific capacity and good rate discharge performance, and achieve good rate Discharge performance, good uniform dispersion system, the effect of particle size is not easy to grow

Inactive Publication Date: 2010-06-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the shortcomings of lithium titanate composite materials in the prior art that cannot take into account the high initial discharge specific capacity and good rate discharge performance, and provide a high initial discharge specific capacity and good discharge performance. Lithium titanate composite material with rate discharge performance and preparation method thereof

Method used

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  • Lithium titanate composite material and preparation method thereof
  • Lithium titanate composite material and preparation method thereof
  • Lithium titanate composite material and preparation method thereof

Examples

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Embodiment 1

[0043] This example illustrates the preparation of the lithium titanate composite material of the present invention.

[0044] 21.6 g LiOH·H 2 O was dissolved in 180 grams of deionized water, and 9.7 grams of glucose was added. After the glucose was completely dissolved, D was added under stirring conditions. 50 0.2 microns, D 95 0.7 micron anatase TiO 2 Ultrafine powder 47.9 grams ( figure 1 for the TiO 2 SEM image of ultrafine powder), continue to stir the solution for 30 minutes, and dry it at 120°C to obtain the precursor after removing moisture. The precursor was sintered at a constant temperature of 800°C in a nitrogen atmosphere for 20 hours, and cooled naturally to room temperature to obtain a carbon-coated lithium titanate composite material M1. Based on the total amount of the lithium titanate composite material, the carbon The content is 5.4% by weight.

[0045] figure 2 The SEM image of the lithium titanate precursor after water removal was obtained by using...

Embodiment 2

[0051] This example illustrates the preparation of the lithium titanate composite material of the present invention.

[0052] 33.1 g LiNO 3 Dissolve in 60 grams of deionized water, and add 14.55 grams of sucrose, after the sucrose is completely dissolved, slowly add D 50 0.4 microns, D 95 0.85 micron rutile TiO 2 47.9 grams of superfine powder, continue to stir the solution for 30 minutes, dry at 130° C., and obtain the precursor after removing water. The precursor was sintered at a constant temperature of 900°C in a nitrogen atmosphere for 16 hours, and cooled naturally to room temperature to obtain the carbon-coated lithium titanate material M2 provided by the present invention. Based on the total amount of the lithium titanate composite material, carbon The content is 9.1% by weight. The average particle diameter of the lithium titanate is 1.5 microns.

Embodiment 3

[0054] This example illustrates the preparation of the lithium titanate composite material of the present invention.

[0055] 49.1 grams of lithium acetate dihydrate were dissolved in 100 grams of deionized water, and 9.7 grams of superfine carbon black (D 95 is 0.5 micron), under the condition of stirring, slowly add D 50 0.2 µm, D 95 0.85 micron brookite TiO 2 47.9 grams of superfine powder, continue to stir the solution for 30 minutes, leave the solution in a beaker, dry it at 130° C., and obtain a precursor after removing water. The precursor was sintered at a constant temperature of 950° C. in a nitrogen atmosphere for 6 hours, and naturally cooled to room temperature to obtain the carbon-coated lithium titanate material M3 provided by the present invention. Based on the total amount of the lithium titanate composite material, The carbon content is 14.2% by weight. The average particle diameter of the lithium titanate is 1.2 microns.

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Abstract

The invention relates to a spinel lithium titanate composite material, which contains lithium titanate. The diameter of the microcrystalline grains of the lithium titanate is 36-43nm and the average particle diameter of the lithium titanate is 1-3 microns. The invention additionally provides a preparation method for the lithium titanate composite material. The lithium titanate composite material of the invention contains a small amount of TiO2 and Li2TiO impurity phases. Batteries made of the lithium titanate composite material have good electrochemical properties. Moreover, the preparation method and the production technology for the lithium titanate composite material are simple and the industrialization can be realized.

Description

technical field [0001] The invention relates to a lithium titanate composite material and a preparation method thereof. Background technique [0002] In 1996, K. Zaghib of Canada proposed for the first time that lithium titanium oxide could be used as the negative electrode. Since then, researchers have started a lot of research on lithium titanium oxide negative electrode. Lithium titanate (Li 4 Ti 5 o 12 ) is a material that has the advantages of no SEI film formation, no change in the lattice during charging and discharging, flat potential, and environmental friendliness. One of the preferred materials. Replacing carbon materials with lithium titanate can fundamentally eliminate the safety hazards of lithium-ion batteries, and greatly improve the cycle performance and fast charge-discharge performance of lithium-ion batteries. [0003] At present, there are many preparation methods for lithium titanate, mainly focusing on solid-phase method and sol-gel method. The s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00
CPCC01G23/005C01P2006/40C01P2004/03C01G23/047H01M4/043H01M4/485H01M10/0525H01M4/1391Y02E60/122H01M4/625C01P2004/64C01P2004/62B82Y30/00C01P2006/80H01M4/131Y10T428/2982Y02E60/10
Inventor 徐茶清姜占锋蒋连池李红艳叶云波
Owner BYD CO LTD
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