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Lithium titanate/carbon composite material and method for preparing material

A carbon composite material, lithium titanate technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high preparation cost, difficult to scale production, poor electrical performance, etc., and achieve good electrical conductivity and good electrochemical performance. , the effect of high rate performance

Active Publication Date: 2015-05-20
斌源材料科技(上海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of lithium titanate / carbon composite material and preparation method thereof, to overcome the poor electrical performance of lithium titanate / carbon composite material in the prior art, preparation cost High, not easy to realize the disadvantages of large-scale production

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  • Lithium titanate/carbon composite material and method for preparing material
  • Lithium titanate/carbon composite material and method for preparing material
  • Lithium titanate/carbon composite material and method for preparing material

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Embodiment 1

[0053] The method for preparing lithium titanate / carbon composite material in the present embodiment is as follows:

[0054] 1) Dissolving 0.01 g of biomass-derived carbonaceous mesophase in 100 mL of ethanol to obtain mesophase solution A with a concentration of 1 g / L;

[0055] 2) Add 10 g of lithium titanate and 0.01 g of sodium dodecyl sulfate to the mesophase solution A under stirring conditions, and obtain a lithium titanate / carbon composite precursor through centrifugal drying and ball milling;

[0056] 3) heat-treating the lithium titanate / carbon composite precursor in an argon atmosphere at 650° C. for 3 h, and cooling to obtain the final product lithium titanate / carbon composite material.

[0057] The biomass-derived carbonaceous mesophase in this example is the biomass-derived carbonaceous mesophase obtained in Example 1 in the publication number CN 1421477A.

[0058] The TEM photo of the prepared lithium titanate / carbon composite is shown in figure 2 . From the ...

Embodiment 2

[0060] The method for preparing lithium titanate / carbon composite material in the present embodiment is as follows:

[0061] 1) Dissolving 1 g of biomass-derived carbonaceous mesophase in 100 mL of ethanol to obtain mesophase solution A with a concentration of 10 g / L;

[0062] 2) Under the condition of stirring, the molar ratio between Li:Ti is 0.6, take by weighing 2.50g of titanium dioxide and 0.69g of lithium carbonate, and take by weighing 0.05g of sodium dodecylbenzenesulfonate and add in the mesophase solution A , after centrifugal drying and ball milling, the lithium titanate / carbon composite precursor was obtained;

[0063] 3) The lithium titanate / carbon composite precursor was heat-treated at 1000° C. for 14 hours in argon containing 10% hydrogen, and cooled to obtain the final lithium titanate / carbon composite material.

[0064] The biomass-derived carbonaceous mesophase in this example is the biomass-derived carbonaceous mesophase obtained in Example 2 of the publi...

Embodiment 3

[0067] The method for preparing lithium titanate / carbon composite material in the present embodiment is as follows:

[0068] 1) Dissolving 0.1 g of biomass-derived carbonaceous mesophase in 100 mL of ethanol to obtain mesophase solution A with a concentration of 1 g / L;

[0069] 2) Under stirring conditions, according to the molar ratio of Li:Ti being 0.82, weigh 30g of tetrabutyl titanate titanium and 7.37g of lithium acetate and 0.03g of sodium dodecyl sulfate into the intermediate phase solution A, and use acetic acid to Adjust the pH value to 6.5 and stir until a gel is formed; the gel is vacuum dried and ball milled to obtain a lithium titanate / carbon composite precursor;

[0070] 3) heat-treating the lithium titanate / carbon composite precursor at 850° C. for 5 h in a nitrogen-containing atmosphere, and cooling to obtain the final lithium titanate / carbon composite material.

[0071] The biomass-derived carbonaceous mesophase in this example is the biomass-derived carbonac...

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Abstract

The invention discloses a method for preparing a lithium titanate / carbon composite material. The method comprises the following steps of (1) preparing a biomass-derived carbonaceous intermediate phase solution A: dissolving the biomass-derived carbonaceous intermediate phase solution A into a solvent to prepare the intermediate phase solution A with the concentration of 0.01-10g / L; (2) preparing a lithium titanate / carbon compound precursor; and (3) thermally treating the lithium titanate / carbon compound precursor in inert gas or inert gas mixed with reduction gas, and cooling, thus preparing the lithium titanate / carbon composite material. The lithium titanate / carbon composite material prepared by the method is good in electrical conductivity and high-rate performance. Besides, the method for preparing the lithium titanate / carbon composite material is low in cost, environmentally friendly, and easy in realizing scale production.

Description

technical field [0001] The invention belongs to composite materials, in particular to a lithium titanate / carbon composite material. Background technique [0002] With the increasing popularity of portable electronic products such as notebook computers and mobile phones, as well as the development of electric vehicles and energy storage batteries, higher requirements are placed on the energy density, service life and safety of power supplies. At present, commercial lithium-ion batteries mostly use carbon materials such as graphite and Li 2 CoO 2 Form a rocking chair (Rocking Chair) type rechargeable battery. Although compared with metal lithium, carbon anode materials have greatly improved in terms of safety performance and cycle performance, but there are still the following disadvantages: the potential of carbon anode is very close to that of metal lithium, and when the battery is overcharged , metal lithium is easy to precipitate on the surface of carbon electrodes and ...

Claims

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Application Information

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IPC IPC(8): H01M4/485
CPCH01M4/1391H01M4/362H01M4/485H01M4/625Y02E60/10
Inventor 赵斌元杨海燕刘佳丽谭庆彪王垒
Owner 斌源材料科技(上海)有限公司
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