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Lithium titanate material coated with LiTi2O4 and preparation method of lithium titanate material

A technology of surface coating and lithium titanate, which is applied in the field of clean energy, can solve the problems of large specific surface of lithium titanate materials, reduced cycle performance, and ineffective improvement of diffusion capacity.

Active Publication Date: 2016-11-23
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, after the material is nano-sized, the specific surface area of ​​the material increases greatly, which makes the material easy to agglomerate and increases the difficulty of battery pulping
Element doping often changes the original lattice structure of lithium titanate while improving the lithium titanate material, resulting in a decrease in its cycle performance.
However, when the surface coating is improperly selected, such as various carbon coatings, it can only improve the electronic conductivity of the lithium titanate material, and the carbon layer on the surface of the lithium titanate particles has a negative effect on Li + The effect of improving the diffusion ability at the interface is not obvious, and even hinders the Li + Diffusion at the interface; and the carbon-coated lithium titanate material is often larger than the surface, and it is also prone to agglomeration during use

Method used

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  • Lithium titanate material coated with LiTi2O4 and preparation method of lithium titanate material
  • Lithium titanate material coated with LiTi2O4 and preparation method of lithium titanate material
  • Lithium titanate material coated with LiTi2O4 and preparation method of lithium titanate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh lithium carbonate and anatase titanium dioxide according to the molar ratio Li:Ti=4:5, add them into absolute ethanol and ball mill and mix evenly, dry and sieve the mixed slurry to obtain a white powder; place the obtained white powder in an atmosphere furnace The lithium titanate material was obtained by raising the temperature to 900° C. for 4 hours and cooling to room temperature naturally in an air atmosphere.

[0032] According to LiTi in the synthesized product 2 o 4The design content is 13wt% and weigh lithium titanate, lithium carbonate and tetrabutyl titanate; uniformly disperse the weighed lithium carbonate in 50% ethanol aqueous solution to make a lithium carbonate dispersion; Butyl ester is uniformly dispersed in 70% ethanol aqueous solution to make tetrabutyl titanate dilution; add tetrabutyl titanate dilution to lithium carbonate dispersion to make a mixed solution, and then weigh titanate Lithium was added to the mixture and stirred evenly, and t...

Embodiment 2

[0034] Weigh lithium carbonate and rutile titanium dioxide according to the molar ratio Li:Ti=4.05:5 and add them into absolute ethanol for ball milling and mixing evenly, dry and sieve the mixed slurry to obtain white powder; place the obtained white powder in an atmosphere furnace In an air atmosphere, the temperature was raised to 900° C. for 8 hours, and then naturally cooled to room temperature to obtain a lithium titanate material.

[0035] According to LiTi in the synthesized product 2 o 4 The design content is 10wt% and weigh lithium titanate, lithium hydroxide and tetraethyl titanate; uniformly disperse the weighed lithium hydroxide in 50% ethanol aqueous solution to make a lithium hydroxide dispersion; Tetraethyl titanate was uniformly dispersed in 70% ethanol aqueous solution to prepare a tetraethyl titanate dilution; the tetraethyl titanate dilution was added dropwise to the lithium hydroxide dispersion to form a mixed solution, and then weighed Add the good lith...

Embodiment 3

[0037] Weigh lithium hydroxide and anatase titanium dioxide according to the molar ratio Li:Ti=4.1:5, add into water and ball mill and mix evenly, dry and sieve the mixed slurry to obtain white powder; place the obtained white powder in an atmosphere furnace in air Under the atmosphere, the temperature was raised to 800° C. for 8 hours, and then naturally cooled to room temperature to obtain a lithium titanate material.

[0038] According to LiTi in the synthesized product 2 o 4 The design content is 6wt% and weigh lithium titanate, lithium oxalate and tetraisopropyl titanate; uniformly disperse the weighed lithium oxalate in 50% ethanol aqueous solution to make a lithium oxalate dispersion; weigh the weighed titanate Tetraisopropyl ester is evenly dispersed in 70% ethanol aqueous solution to prepare tetraisopropyl titanate dilution; add tetraisopropyl titanate dilution to lithium oxalate dispersion to prepare mixed solution, and then weigh The good lithium titanate is added...

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Abstract

The invention provides a lithium titanate material coated with LiTi2O4 and a preparation method of the lithium titanate material. LiTi2O4 has a stable spinel structure the same with lithium titanate, more importantly, the electronic conductivity of LiTi2O4 is far higher than that of lithium titanate, cell parameters of LiTi2O4 are higher than those of lithium titanate, after lithium titanate material is coated with LiTi2O4, the rate capability of the lithium titanate material can be improved effectively, and the lithium titanate material can adapt to high-current charging and discharging while the cycle performance of lithium titanate is not affected. The lithium titanate material prepared with the method is good in rate capability and excellent in cycle performance. Besides, required raw materials are cheap, the process is simple, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of clean energy, and relates to a lithium-ion battery negative electrode material and a preparation method thereof, in particular to a surface-coated LiTi 2 o 4 Lithium titanate material and preparation method thereof. Background technique [0002] In recent years, lithium-ion rechargeable batteries have received more and more attention as a recyclable clean energy source, and have been widely used in various digital products and vehicles. As the range of applications becomes wider and wider, higher requirements are put forward for the safety, rate performance and service life of lithium-ion batteries. Most lithium-ion batteries currently on the market use lithium-intercalable carbon materials as negative electrode materials. However, due to the low lithium intercalation potential of carbon materials, metal lithium dendrites are easily precipitated on the surface, which can pierce the separator and cause ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M10/0525
CPCH01M4/366H01M4/485H01M10/0525Y02E60/10
Inventor 高云刘建红吴宁宁王兴勤王赛
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD