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Doped modified lithium titanate composite material and preparation method

A kind of technology of lithium titanate and composite materials, applied in the direction of titanium compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of fast capacity decay, poor conductivity, poor electrochemical performance, etc., achieve excellent charge and discharge, improve uniformity The effect of lowering the reaction temperature

Inactive Publication Date: 2014-03-26
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since Li 4 Ti 5 o 12 It is an insulating material with poor conductivity, and its capacity decays quickly when charging and discharging with a large current, resulting in poor electrochemical performance at high rates.

Method used

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  • Doped modified lithium titanate composite material and preparation method
  • Doped modified lithium titanate composite material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 6.98g of TiO 2 , 7.58g of lithium formate, 0.0217g of tantalum oxide, 0.0473g of dysprosium oxide and 1.2g of glucose and 1.5g of citric acid were added to the ball mill jar, followed by the addition of 35g of agate balls and 120ml of absolute ethanol, sealed ball mill jar , and ball milled at a speed of 380r / min for 6 hours on a ball mill to obtain a uniformly mixed slurry. Transfer the slurry to a drying dish, put it into an oven and dry it at 80°C to obtain the precursor. Put the precursor powder in a tube furnace, and under the protection of argon, raise the temperature to 500°C at a rate of 120°C / hour and keep it warm for 2 hours to decompose the raw material initially. After the temperature drops to 20-50°C, the calcined powder is obtained. body. Put the calcined powder into a ball mill jar, add 3.0g of soluble starch, then add 25g of agate balls and 50ml of absolute ethanol, and mill on a ball mill at a speed of 400r / min for 12 hours to obtain a uniformly...

Embodiment 2

[0024] Weigh 6.98g of TiO 2 , 4.24g of lithium carbonate, 0.0255g of manganese dioxide, 0.0283g of zirconia and 1.2g of citric acid are added to the ball mill jar, followed by 50g of agate balls and 100ml of absolute ethanol, sealed ball mill jar, on the ball mill Ball milled at a speed of 350r / min for 12 hours to obtain a uniformly mixed slurry. Transfer the slurry to a drying dish, put it into an oven and dry it at 80°C to obtain the precursor. Put the precursor powder in a tube furnace, and under the protection of argon, raise the temperature to 500°C at a rate of 160°C / hour and keep it warm for 5 hours to decompose the raw material initially. After the temperature drops to 20-50°C, the calcined powder is obtained. body. Put the calcined powder into a ball mill jar, add 1.5g of polypropylene alcohol, then add 35g of agate balls and 55ml of absolute ethanol to mix, and mill on a ball mill at a speed of 450r / min for 5 hours to obtain a well-mixed mixture. slurry. Transfer...

Embodiment 3

[0026] Weigh 6.98g of TiO 2 , 7.55g of lithium acetate, 0.0436g of hafnium dioxide, 0.1867g of lanthanum trioxide and 1.5g of glucose are added to the ball mill jar, followed by the addition of 35g of agate balls and 90ml of absolute ethanol, sealed ball mill jar, in the ball mill and ball milled at a speed of 380r / min for 8 hours to obtain a uniformly mixed slurry. Transfer the slurry to a drying dish, put it into an oven and dry it at 80°C to obtain the precursor. Put the precursor powder in a tube furnace, and under the protection of argon, raise the temperature to 500°C at a rate of 180°C / hour and keep it warm for 4 hours to decompose the raw material initially. After the temperature drops to 20-50°C, the calcined powder is obtained body. Put the calcined powder into a ball mill jar, add 3.8g of polyvinyl alcohol, then add 35g of agate balls and 60ml of absolute ethanol, and mill on a ball mill at a speed of 350r / min for 15 hours to obtain a uniformly mixed slurry mater...

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Abstract

The invention relates to a doped modified lithium titanate composite material and a preparation method. The doped modified lithium titanate composite material is characterized in that the molecular formula of the lithium titanate composite material is LiaMpNqTixO12 / C, wherein M and N are doped modified metal ions, a equals to 4, p is greater than 0, but less than 0.1, q is greater than 0, but less than 0.1, the sum of p and q is greater than 0, but less than or equal to 0.1, and the sum of p, q and x equals to 5. The invention also provides the preparation method of the doped modified lithium titanate composite material. Compared with a conventional preparation method of lithium titanate, the preparation method has relatively low reaction temperature and relatively short reaction time, also has the characteristics of simple preparation process, short preparation period, suitability of industrialized batch production. The modified lithium titanate prepared by adopting the preparation method has good charge-discharge, circulating and high-rate performances.

Description

technical field [0001] The invention relates to a battery electrode material and a preparation method, in particular to a modified lithium titanate composite material for the negative electrode of a lithium ion secondary battery and a preparation method. Background technique [0002] As a high specific energy chemical power source, lithium-ion secondary batteries have been widely used in mobile communications, notebook computers, video cameras, cameras, portable instruments and other fields, and have rapidly developed into one of the most important secondary batteries at present. At present, most of the negative electrode materials used in commercially available lithium-ion batteries are carbon materials, but it has a fatal problem, that is, when the battery is fast-charged or overcharged, metal lithium may be precipitated on the surface of the electrode material, and dendrites may be formed to cause Short circuit, which will not only reduce the service life of the product, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485C01G23/00
CPCY02E60/122C01G23/00H01M4/362H01M4/485H01M10/0525Y02E60/10
Inventor 王丹张春明吴晓燕何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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