Preparation method of Li4Ti5O12/C composite material

A composite material and precursor technology, which is applied in the field of carbon-doped lithium titanate composite material and its preparation, can solve the problems of complicated process and high cost, and achieve the effect of simple preparation process, low cost, and easy industrial production

Inactive Publication Date: 2014-02-05
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies existing in the prior art, the present invention will solve the problem of complex process and high cost of the external carbon source and its existence, and provide a kind of no external carbon source, low cost, one-step high-temperature solid-phase method to synthesize Li 4 Ti 5 o 12 Preparation method of / C composite material

Method used

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  • Preparation method of Li4Ti5O12/C composite material
  • Preparation method of Li4Ti5O12/C composite material
  • Preparation method of Li4Ti5O12/C composite material

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Effect test

Embodiment 1

[0045] A kind of Li 4 Ti 5 o 12 The preparation method of / C composite material comprises the steps:

[0046] (1) Li 4 Ti 5 o 12 / C composite material precursor preparation:

[0047] Add 2.131g of titanium dioxide as the titanium source, 2.050g of lithium lactate as the lithium source and carbon source in the ball milling tank, add the dispersant and then carry out ball milling. During the ball milling process, rotate forward and reverse alternately every 1h, and ball mill and mix at a speed of 450r / min for 6h Afterwards, the resulting mixture was placed in an oven at 60°C for 3 hours to obtain Li 4 Ti 5 o 12 / C composite material precursor;

[0048] Wherein, the amount of the dispersant added is subject to the ability to submerge the powdery material, so that the dispersant can form a viscous slurry with the powdery material, making the ball milling of the material more uniform.

[0049] (2) Li 4 Ti 5 o 12 / C composite preparation:

[0050] Under an argon atmosp...

Embodiment 2

[0055] A kind of Li 4 Ti 5 o 12 The preparation method of / C composite material comprises the steps:

[0056] (1) Li 4 Ti 5 o 12 / C composite material precursor preparation:

[0057] Add 4.1802g of titanium dioxide as the titanium source and 4.2273g of lithium stearate as the lithium source and carbon source in the ball milling tank. After adding the dispersant, ball milling is carried out. During the ball milling process, the positive and negative rotations are alternately rotated every 1h, and the ball milling speed is 450r / min. After mixing for 6 hours, the resulting mixture was kept in an oven at 60°C for 3 hours to obtain Li 4 Ti 5 o 12 / C composite material precursor;

[0058] The amount of dispersant added is based on the ability to submerge the powdery material, so that the dispersant can form a viscous slurry with the powdery material, making the ball milling of the material more uniform.

[0059] (2) Li 4 Ti 5 o 12 / C composite preparation:

[0060] Un...

Embodiment 3

[0064] A kind of Li 4 Ti 5 o 12 The preparation method of / C composite material comprises the steps:

[0065] (1) Li 4 Ti 5 o 12 / C composite material precursor preparation:

[0066] Add 10.3285g of titanium dioxide as the titanium source, 7.4581g of lithium lactate and 7.5126g of lithium stearate as the lithium source and carbon source in the ball milling tank. After adding the dispersant, carry out ball milling. After ball milling and mixing for 6 hours at a rotational speed of 450r / min, the resulting mixture was placed in an oven and kept at 60°C for 5 hours to obtain Li 4 Ti 5 o 12 / C composite material precursor;

[0067] The amount of dispersant added is based on the ability to submerge the powdery material, so that the dispersant can form a viscous slurry with the powdery material, making the ball milling of the material more uniform.

[0068] (2) Li 4 Ti 5 o 12 / C composite preparation:

[0069] Under an argon atmosphere, the Li obtained in step (1) 4 T...

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Abstract

The invention provides a preparation method of a Li4Ti5O12/C composite material aiming at the defects that the preparation process of an existing Li4Ti5O12/C composite material is complicate and the cost is high. The preparation method comprises the following steps: on the basis of taking titanium dioxide as a titanium source and taking small molecular lithium carboxylate or a mixture of small molecular lithium carboxylate and inorganic lithium salt as a lithium source and carbon source, after adding a dispersing agent, adequately mixing by ball-milling, and firing in a muffle furnace or tube-type furnace under an inert atmosphere to obtain the Li4Ti5O12/C composite material by adopting a subsection constant-temperature sintering method. The Li4Ti5O12/C composite material prepared by the preparation method has the particle size of being 250-350nm and has good electrical conductivity and high-rate capacity. The preparation method is simple in process and low in cost, and is easily applied to industry because the Li4Ti5O12/C composite material can be synthesized by a solid phase sintering method without additionally adding the carbon source.

Description

technical field [0001] The invention relates to a carbon-doped lithium titanate composite material and a preparation method thereof, in particular to a one-step solid-phase sintering without an external carbon source to synthesize lithium-ion batteries. 4 Ti 5 o 12 / C composite material preparation method. Background technique [0002] As one of the clean energy sources in the future, lithium-ion batteries are widely used in power supplies such as computers, mobile phones, and cameras because of their advantages such as high platform voltage, small size, light weight, no memory effect, and good reliability. Applied to electric vehicles and hybrid electric vehicles, it is considered to be a green and clean energy in the future and has been developed on a large scale. At present, the anode materials that have been commercialized on a large scale are mainly graphite-based carbon anode materials. Graphite carbon anode materials have been studied early, the technology is matu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393
CPCY02E60/122H01M4/364H01M10/0525Y02E60/10
Inventor 胡学步张永龙陈顺洪韩志敏
Owner CHONGQING UNIV OF TECH
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