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Nanoscale lithium titanate compound and preparation method thereof

A technology of nano-lithium titanate and composites, which is applied in the direction of electrode manufacturing, active material electrodes, electrical components, etc., can solve the problems that conductivity and density do not play a significant role, and achieve good cycle performance, good rate performance, high Effect of charge and discharge capacity

Active Publication Date: 2010-01-20
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods did not play a significant role in addressing conductivity and density, necessitating the development of new synthetic processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Lithium hydroxide (molecular formula LiOH, 3.75mol) 90g, titanium trichloride (molecular formula TiCl 3 , 5mol) 771.2g and copper nitrate (molecular formula Cu(NO 3 ) 2 ·3H 2 (2,0.25mol) 60.4g were mixed to obtain a mixture A. Mixture A was mixed with 92.16 g of sucrose and dissolved in water to obtain Mixture B. Mix 9.2 g of single-walled carbon nanotubes with 46 g of polyethylene glycol, and disperse them into 500 g of water by ultrasonic to obtain carbon nanotube dispersion C. Mix the mixture B with the carbon nanotube dispersion C, then heat the resulting mixed solution at a temperature of 100° C. under a nitrogen atmosphere for 2 hours to obtain a colloid, and sinter the resulting colloid in a nitrogen atmosphere furnace at a temperature of 500° C. for 48 hours, A nano-lithium titanate composite covered by carbon nanotubes is obtained.

[0029] The morphology of the product observed by a field emission scanning electron microscope (SEM) is an octahedral struct...

Embodiment 2

[0032] Lithium nitrate (molecular formula LiNO 3 , 3.8mol) 262.2g, titanium tetrachloride (molecular formula TiCl 4 , 5mol) 948.5g and nickel nitrate (molecular formula Ni(NO 3 ) 2 ·6H 2 (2, 0.2mol) 58.16g, mixed to obtain mixture A. Mixture A and 634.43 g of glucose were mixed and dissolved in water to obtain mixture B. Mix 20 g of double-walled carbon nanotubes with 10 g of polyvinyl alcohol and ultrasonically disperse them into 800 g of water to obtain carbon nanotube dispersion C. The mixture B was mixed with the carbon nanotube dispersion liquid C, and the resulting mixed solution was heated at 120° C. for 1.8 hours under a nitrogen atmosphere to obtain a colloid, and the obtained colloid was sintered at a temperature of 600° C. in a nitrogen atmosphere furnace for 40 hours to obtain a carbon nanotube Nanotube-coated nanolithium titanate composites.

[0033] The morphology of the product observed by a field emission scanning electron microscope (SEM) is an octahedra...

Embodiment 3

[0036] Lithium carbonate (molecular formula Li 2 CO 3 , 1.925mol) 142.45g, titanium trichloride (molecular formula TiCl 3 , 5mol) 771.2g and aluminum nitrate (molecular formula Al(NO 3 ) 3 9H 2(2, 0.15mol) 56.25g, mixed to obtain mixture A. Mixture A was mixed with 970 g of citric acid and dissolved in water to obtain mixture B. Mix 30 g of multi-walled carbon nanotubes and 90 g of cetyltrimethylammonium chloride and disperse them into 1000 g of water by ultrasonic to obtain carbon nanotube dispersion C. The mixture B was mixed with the carbon nanotube dispersion C, and the resulting mixed solution was heated at 150° C. for 1.5 hours under a nitrogen atmosphere to obtain a colloid, and the obtained colloid was sintered at a temperature of 800° C. in an argon atmosphere furnace for 30 hours, and obtained by Nano-lithium titanate composites coated with carbon nanotubes.

[0037] The morphology of the product observed by a field emission scanning electron microscope (SEM) ...

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Abstract

The invention relates to a nanoscale lithium titanate compound and a preparation method thereof. The nanoscale lithium titanate compound is prepared by following steps: a lithium compound, a titanium compound and a doped element compound are mixed according to a molar ratio of 0.75-0.80:1:0:0.05 of Li to Ti to doped elements so as to form a mixture A; the mixture A and a complexing agent are mixed according to a weight ratio of 1:0.1-10 and dissolved in water to form a mixture B; and the mixture B and a carbon nanotube dispersion C are mixed to form the nanoscale lithium titanate compound coated by carbon nanotubes with a nanoscale grain size. The preparation method comprises the following steps: mixing the mixture B and the carbon nanotube dispersion C; heating an obtained mixture in nitrogen at 100-200 DEG C for 1-2 hours to obtain gel; and sintering the obtained gel in inert atmosphere at 500-1,000 DEG C for 5-48 hours to obtain the powdered lithium titanate compound. The lithium titanate compound is nanoscale lithium titanate coated by the carbon nanotubes, has fine and even grain and high purity and has the characteristics of higher charge and discharge capacity, good rate discharge performance, good cycle performance and good safety performance, and the like, thus the lithium titanate compound is an ideal anode material for manufacturing a lithium ion battery.

Description

【Technical field】 [0001] The invention relates to a nano-lithium titanate composite and a preparation method thereof, in particular to a nano-lithium titanate composite with carbon nanotubes as a coating material and a preparation method thereof. 【Background technique】 [0002] Lithium titanate (Li 4 Ti 5 o 12 ) is a new type of negative electrode material with good cycle performance, good charge and discharge platform, large theoretical specific capacity, and no reaction with electrolyte. Using lithium titanate as the negative electrode material of lithium-ion batteries has better electrochemical performance and safety performance, as shown in: 1. The theoretical specific capacity of lithium titanate is 175mAh / g, and the actual specific capacity is about 165mAh / g, which is almost the same as The theoretical capacity is equal and concentrated in the charging and discharging platform area; 2. Using lithium titanate nanocrystals as the anode, the surface is extremely large ...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/58H01M4/04
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 孔令涌吉学文王允实
Owner SHENZHEN DYNANONIC
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