Method for preparing lithium titanate material

A lithium titanate, battery material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor conductivity, poor volume change cycle performance, affecting rate and cycle, etc., to solve the problem of coating Incomplete, the effect of improving rate performance, and improving conductivity

Inactive Publication Date: 2016-11-23
天津普兰能源科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anodes of commercial lithium-ion batteries are mostly graphite-based carbon materials, and graphite anodes have the following disadvantages: the low migration rate of lithium ions leads to poor high-rate charge and discharge capabilities, and the lithium intercalation potential is close to the lithium precipitation potential, resulting in poor safety performance. , the large volume change during charge and discharge causes poor cycle performance, and the low temperature performance is also not good
However, lithium titanate is not perfect. The material has poor electronic conductivity, low specific capacity and easy gas generation, which affects its rate and cycle.
Generally, the above shortcomings can be improved by coating lithium titanate with carbon material, but it cannot be solved fundamentally, mainly because the previous practice is to add carbon source when mixing raw materials such as lithium source and titanium source, and then sinter it into lithium titanate material , which has the following disadvantages: first, the carbon source coated raw material affects the reaction between the lithium source and the titanium source; Inhomogeneous; Third, amorphous carbon is formed after the carbon source is roasted, and the conductivity is not good

Method used

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  • Method for preparing lithium titanate material
  • Method for preparing lithium titanate material
  • Method for preparing lithium titanate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Weigh 296g of lithium carbonate, 400g of titanium dioxide and 5.6g of zirconium dioxide, add 14g of polyvinyl alcohol, add water to form a dispersion with a solid content of 20%, and ball mill for 4 hours;

[0030] 2) Spray drying to remove moisture, and the obtained solid was calcined at 700° C. for 6 hours in an air atmosphere to obtain a primary lithium titanate material;

[0031] 3) Weigh 2.6g of graphene-coated material, 2.5g of phosphoric acid and 2.7g of alumina and disperse them into water, add the primary lithium titanate material obtained in step 2), add water to adjust the solid content to 25%, and ball mill for 3 hours;

[0032] 4) Spray drying to remove moisture, and the obtained solid was calcined at 700° C. for 3 hours under a nitrogen atmosphere to obtain a graphene-coated lithium titanate material with a carbon content of 0.45%.

[0033] from figure 1 From the scanned picture shown, it can be seen that the spherical shape is better, which is conduci...

Embodiment 2

[0035] 1) Weigh 240g of lithium hydroxide, 1200g of titanium dioxide and 14.4g of zirconium dioxide, add 50g of polyvinyl alcohol, add water to form a dispersion with a solid content of 25%, and ball mill for 6 hours;

[0036] 2) Spray drying to remove moisture, and the obtained solid was calcined at 800° C. for 7 hours in an air atmosphere to obtain a primary lithium titanate material;

[0037] 3) Weigh 13g of graphene oxide coating material, 5.4g of lithium fluoride and 20.4g of phosphoric acid and disperse into water, add the primary lithium titanate material obtained in step 2), add water to adjust the solid content to 30%, and ball mill for 3.5 hours ;

[0038] 4) Spray drying to remove moisture, and the obtained solid was calcined at 850° C. for 3.5 hours under a nitrogen-hydrogen mixed gas atmosphere to obtain a graphene-coated lithium titanate material with a carbon content of 0.85%.

Embodiment 3

[0040] 1) Weigh 592g of lithium carbonate, 720g of titanium dioxide and 26.2g of lithium fluoride, add 28g of polyvinyl alcohol, add water to form a dispersion with a solid content of 25%, and ball mill for 5 hours;

[0041] 2) Spray drying to remove moisture, and the obtained solid was calcined at 850° C. for 7 hours in an air atmosphere to obtain a primary lithium titanate material;

[0042] 3) Weigh 28g of multilayer graphene-coated material, 12.1g of phosphoric acid and 17.8g of molybdenum trioxide and disperse them in water, add the primary lithium titanate material obtained in step 2), and add water to adjust the solid content to 30%, and ball mill for 5 Hour;

[0043] 4) Spray drying to remove moisture, and the obtained solid was calcined at 800° C. for 3 hours under a nitrogen atmosphere to obtain a graphene-coated lithium titanate material with a carbon content of 2.9%.

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Abstract

The invention provides a method for preparing a lithium titanate material. A certain quantity of lithium-containing compound, titanium-containing compound and additive are weighed, and a certain amount of deionized water and dispersion agent are added for primary dispersion; moisture is removed after drying to obtain solid 1; then the obtained solid 1 is roasted in air to obtain a primary battery material; a certain quantity of carbon-containing wrapping material and additive are weighed and dispersed in water, the primary battery material is added for secondary sufficient mixing, moisture is moved after drying, and solid 2 is obtained, finally the obtained solid 2 is roasted in the inert or reduction atmosphere, and the graphene-wrapped battery material containing a certain amount of additive is obtained. Due to two times of dispersion and roasting, it is guaranteed that the carbon-containing wrapping layer covers the surface of lithium titanate in a sufficiently uniform and compact mode and is not prone to being damaged or falling off, and accordingly the defect of insufficient wrapping is overcome. Due to use of the additive, conductivity of a lithium titanate body is improved, rate capability of the lithium titanate material is improved, conductivity is high, and gas generation is prevented.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a preparation method of lithium titanate material. Background technique [0002] In recent years, as lithium-ion batteries have become more and more widely used in new energy passenger cars, buses, rail transit, electric boats, starting power supplies, and weapons and equipment, the high-rate charge and discharge of lithium batteries, low-temperature charge and discharge, Cycle life and safety performance requirements are getting higher and higher. At present, the anodes of commercial lithium-ion batteries are mostly graphite-based carbon materials, and graphite anodes have the following disadvantages: the low migration rate of lithium ions leads to poor high-rate charge and discharge capabilities, and the lithium intercalation potential is close to the lithium precipitation potential, resulting in poor safety performance. , The large volume change during charge and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 陈永胜随东张士茂周赤
Owner 天津普兰能源科技有限公司
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