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

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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

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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

Examples

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Example Embodiment

[0020] Example 1

[0021] According to the molar ratio Li:Ti=1, lauric acid:Ti=1:5, weigh 8.51g of tetrabutyl titanate (analytical purity), 2.55g of lithium acetate (analytical purity) and 1g of lauric acid (analytical purity) ), respectively, dissolve them in 12ml of absolute ethanol. Add the ethanol solution of lithium acetate dropwise to the ethanol solution of tetrabutyl titanate, mix well 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 Around, get a uniform milky white gel. The gel was aged in the air for 24 hours, and dried in an oven at 100°C to obtain a pale yellow precursor. Put the precursor into a ball milling tank, add an appropriate amount of agate balls, and ball mill on a ball mill at a speed of 380 r / min for 2 hours to obtain superfine precursor powder. Put the powder in a muffle furnace and heat up to 500°C for 6 hours at a heating rate of 15...

Example Embodiment

[0022] Example 2

[0023] Synthesize 0.005mol Li 4 Al 0.15 Ti 4.85 O 12 According to the molar ratio Li:Ti:Al=80:97:3, weigh 8.25g tetrabutyl titanate (analytical pure), 2.04g lithium acetate (analytical pure) and 2.81g aluminum nitrate (analytical pure) ), 0.125g lauric acid (analytical purity) and 0.44g citric acid (analytical purity), respectively dissolved in 8ml of absolute ethanol. Add the ethanol solution of lithium acetate dropwise to the ethanol solution of tetrabutyl titanate, mix uniformly 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 added to the solution in sequence, 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 dried in an oven at 120°C to obtain a pale yellow precursor. Put the precursor into a ball m...

Example Embodiment

[0024] Example 3

[0025] Synthesis of 0.05mol LiFeTiO 3 , Weigh 17g of tetrabutyl titanate (analytical pure), 5.1g of lithium acetate (analytical pure), 20.2g of ferric nitrate (analytical pure), 2.9g of ethylenediaminetetraacetic acid (analytical pure) and 2.5g of oxalic acid (analytical grade) was dissolved in 12ml of absolute ethanol. Slowly add the ethanol solution of lithium acetate dropwise to the ethanol solution of tetrabutyl titanate, mix well under magnetic stirring, and react for about 10 minutes. Then slowly add the ethanol solution of ferric nitrate to the mixed solution and wait for 15 minutes to react. Then, add the ethanol solution of ethylenediaminetetraacetic acid and oxalic acid to the solution in sequence, 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 dried in an oven at 100°C to obtain a pale yellow precursor. Put the precursor into the ball milling tank, add an appropria...

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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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