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Preparation technique of composite lithium zirconate and modified biphase lithium titanate/titanium dioxide anode material

A technology of composite lithium zirconate and double-phase lithium titanate, which is applied in battery electrodes, structural parts, electrical components, etc., to achieve the effects of strong practicability, simple preparation method, and good electronic and ion conductivity

Active Publication Date: 2018-08-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not dealt with the problem of composite lithium zirconate modified lithium titanate materials with two components

Method used

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  • Preparation technique of composite lithium zirconate and modified biphase lithium titanate/titanium dioxide anode material
  • Preparation technique of composite lithium zirconate and modified biphase lithium titanate/titanium dioxide anode material
  • Preparation technique of composite lithium zirconate and modified biphase lithium titanate/titanium dioxide anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0039] In the preparation of lithium titanate in the present invention, lithium hydroxide and tetrabutyl titanate are uniformly used as lithium source and titanium source. Weigh about 2.9g of lithium hydroxide with a balance, add an appropriate amount of deionized water to dissolve; weigh 26.0mL (25.6g) of tetrabutyl titanate with a graduated cylinder and dissolve it in 20mL of absolute ethanol, and dissolve the tetrabutyl titanate solution in Add to lithium hydroxide solution with stirring. After mixing evenly, dry at 120°C, and heat the dried product to about 700°C for 5 hours. Turn off the heating furnace, cool down to room temperature naturally, and obtain about 6 g of white powder, which is lithium titanate (LTO).

[0040] The lithium titanate is mixed with the zirconium source and the lithium source for preparing the composite lithium zirconate to prepare the composite lithium zirconate modified lithium titanate negative electrode material. Weigh 1.5g of lithium titana...

Embodiment 2

[0042] Weigh about 2.6g of lithium hydroxide with a balance, add an appropriate amount of deionized water to dissolve; weigh 26.0mL (25.6g) of tetrabutyl titanate with a graduated cylinder and dissolve it in 20mL of absolute ethanol, and dissolve the tetrabutyl titanate solution in Add to lithium hydroxide solution with stirring. After mixing evenly, dry at 120°C, and heat the dried product to about 700°C for 5 hours. Turn off the heating furnace, cool down to room temperature naturally, and obtain about 6 g of white powder, which is duplex lithium titanate / titanium dioxide.

[0043] The biphasic lithium titanate / titanium dioxide and lithium zirconate (Li 2 ZrO 3 ) zirconium source and lithium source are mixed to prepare lithium zirconate modified dual-phase lithium titanate / titanium dioxide negative electrode material. Weigh 1.5g of biphasic lithium titanate / titanium dioxide, 0.0345g of zirconium nitrate, 0.0121g of lithium nitrate in 20mL of deionized water and stir evenl...

Embodiment 3

[0045] Weigh 1.5g of biphasic lithium titanate / titanium dioxide, 0.0345g of zirconium nitrate, 0.0241g of lithium nitrate in 20mL of deionized water and stir evenly. A composite lithium zirconate modified dual-phase lithium titanate / titanium dioxide anode material with a mass ratio of 0.01:1.5 to the dual-phase lithium titanate / titanium dioxide. This sample was named LTOT / LZO1.

[0046] The transmission electron microscope morphology of the composite lithium zirconate modified dual-phase lithium titanate / titanium dioxide negative electrode material obtained in this example is as follows: figure 1 As shown, it can be seen that the dual-phase lithium titanate / titanium dioxide is composed of nanocrystals with a size of about 10-50 nm.

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Abstract

The invention provides a composite lithium zirconate and modified biphase lithium titanate / titanium dioxide anode material and a preparation method thereof. The material is prepared by the following steps: taking zirconium nitrate and lithium nitrate as the raw materials of composite lithium zirconate, performing uniform mixing with biphase lithium titanate / titanium dioxide, then performing dryingat 100-200 DEG C and performing sintering at 600-800 DEG C for 3-10 hours. The composite lithium zirconate and modified biphase lithium titanate / titanium dioxide is used as an anode material of a lithium ion battery, and the material can have excellent electronic conductivity and ionic conductivity simultaneously; the material can have excellent electrochemical properties without the need of carbon coating; The material has high coulomb efficiency, excellent multiplying power and cycle performance when quickly charged and discharged under higher current density; and the preparation method hasthe advantages of simple steps, convenient operation and high practicability.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and provides a preparation technology for a high-performance composite lithium zirconate modified dual-phase lithium titanate / titanium dioxide negative electrode material. Background technique [0002] Lithium-ion batteries in which graphite is used as an anode material have been widely used. However, the poor rate performance and limited cycle life of graphite materials limit its application in electric vehicles and hybrid vehicles. [0003] Lithium titanate (Li 4 Ti 5 o 12 , abbreviated as LTO) has a high power density and has become the preferred anode material for lithium-ion batteries for current power vehicles. The outstanding advantages of LTO include: (1) "zero volumetric strain" during charging and discharging, which can ensure long cycle life, (2) high operating voltage (1.55V vs. Li / Li + ) can suppress the formation of solid-state ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485
CPCH01M4/362H01M4/485Y02E60/10
Inventor 白玉俊韩建平张博伦宁亓永新
Owner SHANDONG UNIV
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