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A kind of preparation method of carbon-coated Li4Ti5O12 nanometer negative electrode material

A negative electrode material, carbon coating technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of equipment corrosion, chloride recycling, uneven mixing, cumbersome preparation process, etc., and achieve good high-rate charge and discharge performance , uniform mixing of materials, and excellent electrochemical performance

Inactive Publication Date: 2011-12-28
上海微纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Li prepared by the invention 4 Ti 5 o 12 The surface of the particles is coated with a uniform carbon film, but the carbon source phase is added, the mixing is uneven, and the preparation process is cumbersome. In addition, using lithium chloride as the lithium source has problems such as equipment corrosion and chloride recovery.

Method used

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  • A kind of preparation method of carbon-coated Li4Ti5O12 nanometer negative electrode material
  • A kind of preparation method of carbon-coated Li4Ti5O12 nanometer negative electrode material
  • A kind of preparation method of carbon-coated Li4Ti5O12 nanometer negative electrode material

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Effect test

Embodiment 1

[0029]Weigh 1.47g lithium citrate, 0.78g lithium carbonate and 4g anatase TiO 2 , add 5ml of deionized water, put the three into a ball mill jar and mill for 2h, after drying, sinter at 800°C for 12h, and then naturally cool to room temperature to obtain carbon-coated Li 4 Ti 5 o 12 Nano anode material. It is measured that the carbon content in the carbon-coated lithium titanate material is 6.7%, the average particle size of the particles is 30nm, and the specific surface area is 50.7m 2 / g, the first discharge specific capacity is 121.1mAh / g at 20C, and it is 106.1mAh / g after 100 cycles.

Embodiment 2

[0031] Weigh 2.21g lithium citrate, 0.39g lithium carbonate and 4g anatase TiO 2 , add 5ml of deionized water, put the three into a ball mill jar and mill for 2h, after drying, sinter at 800°C for 12h, and then naturally cool to room temperature to obtain carbon-coated Li 4 Ti 5 o 12 Nano anode material. It is measured that the carbon content in the carbon-coated lithium titanate material is 8.0%, the average particle size of the particles is 25nm, and the specific surface area is 80.2m 2 / g, the first discharge specific capacity is 110.5mAh / g at 20C, and it is 82.6mAh / g after 100 cycles.

Embodiment 3

[0033] Weigh 1.34g butyllithium, 0.78g lithium carbonate and 4g anatase TiO 2 , add 5ml of deionized water, put the three into a ball mill jar and mill for 2h, after drying, sinter at 800°C for 12h, and then naturally cool to room temperature to obtain carbon-coated Li 4 Ti 5 o 12 Nano anode material. It is measured that the carbon content in the carbon-coated lithium titanate material is 4.0%, the average particle size of the particles is 60nm, and the specific surface area is 36.7m 2 / g, the first discharge specific capacity is 98.2mAh / g at 20C, and it is 43.5mAh / g after 100 cycles.

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Abstract

The invention discloses a preparation method of a carbon-coated Li4Ti5O12 lithium-ion battery nano negative electrode material with high rate performance. The method for preparing carbon-coated Li4Ti5O12 nanometer negative electrode material of the present invention is to use a certain amount of organolithium compound as lithium source and carbon source at the same time, and lithium source, organolithium compound and titanium source are fully mixed in a mixer according to a certain molar ratio. Mix, and then put the mixture into a sintering furnace for sintering under an inert atmosphere. The technical method of the invention has the advantages of simple process, less energy consumption, short preparation cycle and easy process control. The prepared Li4Ti5O12 nano anode material has high crystallinity, the surface is covered with a dense, uniform carbon film with a thickness of about 1nm, the average particle size is about 30nm, and the high-rate electrochemical performance is excellent. They are 136.7mAh / g and 121.1mAh / g respectively, and the cycle performance is good.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to carbon-modified lithium-ion batteries Li 4 Ti 5 o 12 Preparation method of nano negative electrode material. Background technique [0002] Li 4 Ti 5 o 12 As a new type of negative electrode material, it has many excellent characteristics: in Li + During the process of intercalation and extraction, the crystal structure of the material basically does not change, that is, the so-called "zero strain" material, which makes Li 4 Ti 5 o 12 Has good structural stability and excellent cycle performance; Li 4 Ti 5 o 12 Has a high lithium intercalation potential (1.55V vs. Li / Li + ), metal lithium will not be precipitated during charging and discharging, and this potential is higher than the reduction potential of most organic electrolytes, so the safety performance is high. [0003] Currently, hindering Li 4 Ti 5 o 12 The main obstacle to commercialization is its ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/485
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 徐云龙郑少伟钱秀珍赵崇军
Owner 上海微纳科技有限公司
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