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Preparation method of lithium titanium negative electrode composite material for lithium ion battery

A technology for lithium-ion batteries and composite materials, which is applied in the field of preparation of lithium titanate negative electrode composite materials for lithium-ion batteries, can solve the problems of dendrite short circuit, safety problems, electrolyte consumption and low initial Coulombic efficiency, etc., and achieve improved conductivity rate, improved conductivity, and improved rate performance

Inactive Publication Date: 2010-05-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anode materials of commercialized lithium-ion batteries mostly use carbon anode materials, but carbon anode materials have some defects: they react with the electrolyte to form a surface passivation film during the first discharge process, resulting in the consumption of electrolyte and lower first Coulombic efficiency. Low; the electrode potential of the carbon electrode is similar to that of lithium metal. When the battery is overcharged, lithium metal may still be precipitated on the surface of the carbon electrode, forming dendrites and causing a short circuit, causing safety problems, etc.
The preparation of lithium titanate / C lithium ion battery negative electrode material by sol-gel method has not been reported yet.

Method used

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  • Preparation method of lithium titanium negative electrode composite material for lithium ion battery
  • Preparation method of lithium titanium negative electrode composite material for lithium ion battery
  • Preparation method of lithium titanium negative electrode composite material for lithium ion battery

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Embodiment 1

[0021] According to mol ratio Li: Ti=1, lauric acid: Ti=1: 5, take the tetrabutyl orthotitanate (analytical pure) of 8.51g, the lithium acetate (analytical pure) of 2.55g and 1g lauric acid (analytical pure) ), which were dissolved in 12ml of absolute ethanol respectively. Add the ethanol solution of lithium acetate dropwise to the ethanol solution of tetrabutyl orthotitanate, mix evenly under magnetic stirring, and react for about 10 minutes, then add the ethanol solution of lauric acid to the mixed solution, and react for 15 hours at room temperature Left and right, a uniform milky white gel was obtained. The gel was aged in the air for 24 hours, and then dried in an oven at 100° C. to obtain a pale yellow precursor. Put the precursor into a ball mill jar, add an appropriate amount of agate balls, and mill on a ball mill at a speed of 380r / min for 2 hours to obtain ultrafine precursor powder. Put the powder in the muffle furnace and raise the temperature to 500°C at a heat...

Embodiment 2

[0023] Synthesis of 0.005mol Li 4 Al 0.15 Ti 4.85 o 12 According to the molar ratio Li:Ti:Al=80:97:3, take by weighing 8.25g of tetrabutyl orthotitanate (analytical pure), 2.04g of lithium acetate (analytical pure) and 2.81g of aluminum nitrate (analytical pure) ), 0.125g lauric acid (analytically pure) and 0.44g citric acid (analytical pure), which were dissolved in 8ml of absolute ethanol respectively. Add the ethanol solution of lithium acetate dropwise to the ethanol solution of tetrabutyl orthotitanate, mix evenly under magnetic stirring, and react for about 10 minutes, then add the ethanol solution of aluminum nitrate to the mixed solution, and wait for about 10 minutes to react. The ethanol solution of citric acid and lauric acid was sequentially added into the solution, and reacted for about 20 hours at room temperature to obtain a uniform milky white gel. The gel was aged in the air for 24 hours, and then dried in an oven at 120° C. to obtain a pale yellow precurs...

Embodiment 3

[0025] Synthesis of 0.05mol LiFeTiO 3 , take by weighing 17g of tetrabutyl orthotitanate (analytically pure), 5.1g of lithium acetate (analytical pure), 20.2g of ferric nitrate (analytical pure), 2.9g ethylenediaminetetraacetic acid (analytical pure) and 2.5g oxalic acid (analytical pure), it is dissolved in the absolute ethanol of 12ml respectively. Slowly add the ethanol solution of lithium acetate to the ethanol solution of tetrabutyl orthotitanate, under magnetic stirring, mix evenly, react for about 10 minutes, then slowly add the ethanol solution of ferric nitrate into the mixed solution, and wait for 15 minutes to react For about 22 hours, add ethylenediaminetetraacetic acid and oxalic acid ethanol solution to the solution in turn, and react for about 22 hours at room temperature to obtain a uniform milky white gel. The gel was aged in the air for 10 hours, and then dried in an oven at 100° C. to obtain a pale yellow precursor. Put the precursor into a ball mill jar, ...

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Abstract

The invention relates to a preparation method of lithium titanium negative electrode composite material for lithium ion battery. In the invention, Li soluble compound and Ti soluble compound are taken as lithium source and titanium source, high polymer compound is added, reaction is carried out by sol-gel method, sintering atmosphere is controlled, and sintering is carried out to obtain the composite material. The method not only can prepare nano crystalline with favourable dispersity and can prepare pyrolytic carbon evenly distributed at the periphery or on the surface of granules and obviously improves conductivity of product. The lithium titanium negative electrode material prepared by the method shows excellent multiplying power performance and is applicable to power battery.

Description

technical field [0001] The invention relates to a preparation method of a battery electrode material, in particular to a preparation method of a lithium titanate negative electrode composite material for a lithium ion battery. Background technique [0002] With the rapid development of transportation, communication and information industries, more and more electronic products have put forward higher requirements on the energy density and power of chemical power sources. Lithium-ion batteries have the advantages of high energy density, high power density, and long cycle life, and have rapidly developed into one of the most important secondary batteries at present. At present, the anode materials of commercial lithium-ion batteries mostly use carbon anode materials, but there are some defects in carbon anode materials: the surface passivation film is formed by the reaction with the electrolyte during the first discharge process, resulting in the consumption of electrolyte and ...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/1391H01M4/1393H01M4/48H01M4/485H01M4/505H01M4/525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨晖王瑾杨浩
Owner NANJING UNIV OF TECH
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