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A modified lithium titanate composite material and its preparation method and application

A composite material, lithium titanate technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of poor electronic conductivity and low rate performance, and achieve high rate performance, high conductivity, and easy coating. Effect

Active Publication Date: 2019-10-29
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is to provide a modified lithium titanate composite material and its preparation method and application in order to overcome the defects of poor electronic conductivity and low rate performance of the existing lithium titanate negative electrode materials

Method used

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  • A modified lithium titanate composite material and its preparation method and application
  • A modified lithium titanate composite material and its preparation method and application
  • A modified lithium titanate composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A C / Li 4 Ti 4.94 Y 0.06 o 12 Preparation method of composite negative electrode material:

[0054] (1) Weigh 861g of lithium acetate dihydrate at the molar ratio of Li:Ti=0.816:1, and weigh Y(NO at the molar ratio of Ti:Y=4.94:0.06 3 ) 3 ·6H 2 O (47.6g), then weighed 66g of citric acid monohydrate at a molar ratio of C:Ti=0.077:1, and added them to 4.9L of absolute ethanol, and stirred for 2 hours to form a clear and transparent mixed solution;

[0055] (2) Measure 3.5 L of tetrabutyl titanate, add it to the previous mixed solution, and stir for 30 minutes to make it evenly mixed;

[0056] (3) Slowly add 1.8L of deionized water dropwise to the above mixed solution while stirring, and a white gel will slowly form due to the slow hydrolysis of tetrabutyl titanate, then stop stirring immediately;

[0057] (4) Add 9.2L deionized water to the above white gel at one time, and stir again for about 2 hours to form a fluid and uniform suspension;

[0058] (5) While stirr...

Embodiment 2

[0062] A C / Li 4 Ti 4.94 Mo 0.06 o 12 Preparation method of composite negative electrode material:

[0063] (1) Weigh 861g of lithium acetate dihydrate at the molar ratio of Li:Ti=0.816:1, and weigh ammonium paramolybdate tetrahydrate at the ratio of Ti:Mo=4.94:0.06 (NH 4 ) 6 Mo 7 o 24 4H 2 O) 22g, and then weighed 66g of citric acid monohydrate according to the molar ratio of C:Ti=0.077:1, and added them to 4.9L of absolute ethanol, and stirred for 2 hours to form a clear and transparent mixed solution;

[0064] (2) Measure 3.5 L of tetrabutyl titanate, add it to the previous mixed solution, and stir for 30 minutes to make it evenly mixed;

[0065] (3) Slowly add 1.8L of deionized water dropwise to the above mixed solution while stirring, and a white gel will slowly form due to the slow hydrolysis of tetrabutyl titanate, then stop stirring immediately;

[0066] (4) Add 9.2L of deionized water to the above white gel at one time, and stir again for about 2 hours to form...

Embodiment 3

[0071] A C / Li 4 Ti 4.94 Al 0.06 o 12 Preparation method of composite negative electrode material:

[0072] (1) Weigh 861g of lithium acetate dihydrate at the molar ratio of Li:Ti=0.816:1, and weigh Al(NO at the molar ratio of Ti:Al=4.94:0.06 3 ) 3 9H 2 O (46.55g), and then weighed 66g of citric acid monohydrate with a molar ratio of C:Ti=0.077:1, and added them to 4.9L of absolute ethanol, and stirred for 2 hours to form a clear and transparent mixed solution;

[0073] (2) Measure 3.5 L of tetrabutyl titanate, add it to the previous mixed solution, and stir for 30 minutes to make it evenly mixed;

[0074] (3) Slowly add 1.8L of deionized water dropwise to the above mixed solution while stirring, and a white gel will slowly form due to the slow hydrolysis of tetrabutyl titanate, then stop stirring immediately;

[0075](4) Add 9.2L of deionized water to the white gel at one time, and stir again for about 2 hours to form a fluid and uniform suspension.

[0076] (5) While ...

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Abstract

The invention discloses a modified lithium titanate composite material, a preparation method and an application thereof. The modified lithium titanate composite material is a composite structure material formed by compositing nano carbon and Li4Ti4.94M0.06O12. The composite structure is formed among primary nano particles, wherein M is one or more of aluminum, molybdenum and yttrium. The nano carbon accounts for 0.57-6.21% by mass of the modified lithium titanate composite material. The modified lithium titanate composite anode material is high in electric conductivity rate, rate capability and initial coulomb efficiency, and can be more widely applied in a lithium ion battery as an energy storage battery required to has a long service life or as a dynamic battery required to be quick to charge or discharge.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a modified lithium titanate composite material and its preparation method and application. Background technique [0002] At present, the commercial lithium-ion battery anode material is mainly graphite, but graphite has the following series of problems: (1) Low safety: low potential platform (<0.25V), easy to precipitate dendrite metal Li and cause short circuit of the battery, It is easy to form SEI film (solid electrolyte interface film, solid electrolyte interface) and cause the electrolyte to be decomposed, which makes the first efficiency low; (2) The cycle performance is not good: there is about 8% volume change of graphite during charge and discharge, which is easy to cause layer The graphite layer of the like structure peels off or even shatters, causing the battery to fail; (3) The ratio is not high: Li + The diffusion coefficient is small, which is not suitable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/10
Inventor 董国徽刘华靖周亮乔永民张殿浩
Owner SHANGHAI SHANSHAN TECH CO LTD