Titanium composite, preparation method thereof and application thereof

A composite material, lithium-titanium composite technology, applied in chemical instruments and methods, titanate, zirconium compounds, etc., can solve problems such as explosion, unsatisfactory rate charge and discharge performance, and easy battery expansion, etc., to achieve excellent performance and easy The effect of large-scale production and high yield

Active Publication Date: 2010-12-01
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the unsatisfactory rate charge and discharge performance of existing titanium-based materials, and batteries containing titanium-based negative electrode materials are prone to expansion during formation, circulation and high-temperature storage, and serious explosions may occur, posing huge safety hazards and The shortcomings of quality problems provide a titanium-based composite material that can be quickly charged and discharged at a high rate in a battery, has excellent cycle performance and high-temperature storage performance, and is safer, and its preparation method and application

Method used

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  • Titanium composite, preparation method thereof and application thereof
  • Titanium composite, preparation method thereof and application thereof
  • Titanium composite, preparation method thereof and application thereof

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[0018] The present invention also provides a preparation method for the above materials. The lithium compound and / or the raw materials capable of preparing the lithium compound are added into a solvent and mixed evenly. The solvent is selected from at least one of alcohols, ketones, ether solvents or water, and the pH value is adjusted Colloidal mixture; mix the obtained mixture with lithium-titanium composite oxide evenly, and dry; treat the dried lithium-titanium composite oxide mixture at high temperature under vacuum or inert atmosphere, cool and grind to obtain titanium series composite material. Wherein, the lithium compound raw material is selected from at least one of lithium salt or lithium hydroxide; the raw materials capable of preparing lithium compound include metal salt or metal oxide and lithium source, and / or non-metal oxide and lithium source. In the present invention, the lithium compound coating layer is preferably prepared by chemical reaction through raw m...

Embodiment 1

[0024] 1) Preparation of lithium-titanium composite oxide coated with lithium zirconate: 24.14g ZrO 2 and 14.48g Li 2 CO 3 Add to the 1:1 ethanol-water mixed solution and mix well, stir well for 1h. Then add 970g of Li with a particle size of about D501.5μm 3 Ti 3 Cr 3 o 12 Lithium-titanium composite oxide powder, the solution is heated to 80 ° C, stirred until the sample is dry. The dried mixture was vacuum-baked in an oven at 800°C for 24 hours, slowly cooled to room temperature, washed and dried to obtain 3% lithium zirconate-coated Li 3 Ti 3 Cr 3 o 12 The D50 is about 2.0μm for titanium-based composite materials.

[0025] 2) Electrode preparation and battery assembly: the obtained titanium-based composite material, acetylene black, and binder were uniformly mixed in a mass ratio of 85:5:10, and coated on aluminum foil or copper foil. After drying in a vacuum oven at 120°C for 4 hours, it was calendered to form a negative electrode.

[0026] Fully mix the binder...

Embodiment 2

[0029] Adopt the same method as Example 1 to prepare titanium-based composite materials and batteries, the difference is that the lithium compound is lithium aluminate, and 23.2gAl 2 o 3 Put it into 1:1 water and acetone, stir and disperse into a uniform slurry in the reaction vessel, heat to 90°C, and press LiOH·H 2 O and Al 2 o 3 Slowly add LiOH·H with a molar ratio of 2:1 2 O, after 100°C stirring and mixing for 2 hours, add 970g lithium titanate powder with particle size D501.0μm, heat the solution to 80°C, and start stirring until the sample is dry. The dried mixture was baked in an oven at 800°C with argon gas for 24 hours, slowly cooled to room temperature, washed and dried to obtain 3% lithium aluminate-coated lithium titanate with a particle size D50 of 1.8 μm. composite material.

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Abstract

The invention provides a titanium composite, which comprises lithium-titanium composite oxide and a lithium compound, wherein the lithium compound comprises the lithium-titanium compound oxide; and the lithium compound is at least one of lithium zirconate, lithium vanadate, lithium metasilicate, lithium metamanganate, lithium carbonate, lithium phosphate, lithium aluminate, lithium hydrogenphosphate, lithium hydroxide, lithium chlorate, lithium sulfate, lithium molybdate, lithium chloride, lithium borate, lithium citrate, lithium tartrate, lithium acetate and lithium oxalate. The composite can realize the high-rate and quick charge and discharge of a battery, improve the recycling performance and high temperature storage performance of materials and in particular improve the equality safety of batteries using high-performance titanium materials. The invention also provides a preparation method for the material, which is simple, easy to operate, high in yield and suitable for massive production. The composite of the invention has a wide application range, can be used alone or in combination with other electrode active materials as a cathode active material of various lithium ion batteries or an electrode material of capacitors.

Description

【Technical field】 [0001] A titanium-based composite material and its preparation method and application. 【Background technique】 [0002] Lithium-ion batteries have been more and more widely used because of their advantages such as high working voltage, long cycle life, no memory effect, small self-discharge, and no environmental pollution. With the rapid development of information technology, various electronic products have a requirements are constantly increasing. [0003] The negative electrode material of the prior art lithium-ion battery is mainly carbon materials such as graphite, but the lithium battery prepared by the graphite negative electrode has many shortcomings in the process of use, for example, lithium dendrites are generated during the charge and discharge process, and the battery is prone to short circuit. There are hidden dangers of fire and explosion, and it is also easy to react with the electrolyte to shorten the service life of the battery. In 1996, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58C01G23/04H01M4/04H01M10/36H01G9/042H01G4/008
CPCC01P2004/82H01M10/0525H01M4/131C01G25/00H01M4/1391C09C1/36C01P2006/40C01G23/005H01M2004/027C01G23/003H01M4/5825C01P2004/84C01G37/006H01M4/364H01M4/485H01M4/366Y02E60/122C01P2004/61Y02E60/10Y10T428/256
Inventor 刘国刚江文锋潘福中夏玉潘虹谷
Owner BYD CO LTD
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