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Lithium titanium composite oxide, modified lithium titanate material, and preparation method and application thereof

A technology of lithium-titanium composite and non-toxic lithium titanate, which is applied in the direction of lithium batteries, electrical components, battery electrodes, etc., can solve the problem of the water absorption of amorphous porous carbon is not easy to bake out, the conductive carbon black cannot form a stable SEI film, and high temperature cracking Complicated technical production process and other issues, to achieve the effect of improving battery gas production and cycle, improving strong hygroscopicity, and excellent cycle performance

Inactive Publication Date: 2019-01-01
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the fact that the amorphous porous carbon formed by the existing pyrolysis carbon coating method has water absorption and is not easy to be baked out in the subsequent use process, the production process of the pyrolysis technology is relatively complicated, and the thickness of the carbon layer is relatively complicated. It is not easy to control, which will affect the batch consistency of materials. Incomplete pyrolysis will affect the performance of materials. Adding conductive carbon black to the battery cannot form a stable SEI film, making the active sites on its surface easy to react with the electrolyte. However, a large amount of gas is generated and the battery cycle is damaged, and a new type of lithium-titanium composite oxide, modified lithium titanate material and its preparation method and application are provided.

Method used

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  • Lithium titanium composite oxide, modified lithium titanate material, and preparation method and application thereof
  • Lithium titanium composite oxide, modified lithium titanate material, and preparation method and application thereof
  • Lithium titanium composite oxide, modified lithium titanate material, and preparation method and application thereof

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Effect test

Embodiment 1

[0048] Lithium carbonate, titanium dioxide, and dopants can be prepared according to the 4 Ti 4.97 K 0.03 o 12 +10%TiO 2 The lithium-titanium composite oxide (referring to the lithium-titanium composite oxide, TiO 2 The mole fraction of Li 4 Ti 4.97 K 0.03 o 12 The ratio of the mole fraction is 10%) to mix the raw materials, in the air atmosphere, pre-calcined at 500°C for 5h, calcined at 700°C for 10h, in the reducing atmosphere of hydrogen and argon (wherein, argon and The mass ratio of hydrogen is 95:5) and the surface is reduced at 650° C. for 5 hours to obtain the lithium-titanium composite oxide.

[0049] Technical effect: The TEM of the obtained lithium-titanium composite oxide is as follows figure 2 shown, from figure 2 It can be clearly seen that two groups of different selected lattice diffraction fringes are spinel-type Li 4 Ti 4.97 K 0.03 o 12 and anatase TiO 2 .

Embodiment 2

[0051] Disperse the lithium-titanium composite oxide obtained in Example 1 in the oil phase system N-methylpyrrolidone, slowly add aniline monomer, stir for 3 hours, and carry out the polymerization reaction of the surface polymer compound to obtain the modified lithium titanate material , the coating amounts were 1%, 2%, and 3%, respectively, and the hydrophobicity test was carried out on the obtained modified lithium titanate material, and the results were as follows image 3 shown. image 3 Among them, the coating amounts of GZ13, GZ12, and GZ11 were 1%, 2%, and 3%, respectively.

Embodiment 3

[0059] Disperse the lithium-titanium composite oxide obtained in Example 1 in ether in the oil phase system, slowly add vinylpyrrolidone monomer, stir for 5 hours, and carry out the polymerization reaction of the surface polymer compound to obtain the modified lithium titanate material. The amount is 1.5%. The obtained modified lithium titanate material was analyzed by scanning electron microscope, and the results were as follows: Figure 4 shown.

[0060] Technical effect: from Figure 4 It can be seen that the surface of the obtained modified lithium titanate material has clear polymer material boundaries.

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Abstract

The invention discloses a lithium titanate composite oxide, a modified lithium titanate material, and a preparation method and application thereof. The preparation method comprises the following steps: a raw material mixture of a lithium source compound and a titanium source compound is calcined and then subjected to surface reduction treatment to obtain a lithium titanium composite oxide; whereinthe molar ratio of lithium element to titanium element in the raw material mixture is b, and 0.75 < b < 0.8; the surface reduction treatment is carried out in a reducing atmosphere, wherein the reducing atmosphere is a hydrogen atmosphere or mixed atmosphere of hydrogen and other gases, and the other gases are nitrogen and / or inert gases, and the temperature of the surface reduction treatment is600 DEG C-800 DEG C, and the time of surface reduction treatment is 5-15h. The lithium titanium compound prepared by the preparation method has higher ionic and electronic conductivity, so the addition of conductive carbon black in the manufacturing process of the battery electrode sheet can be reduced, and the battery prepared by the preparation method has excellent cycling performance.

Description

technical field [0001] The invention relates to a lithium-titanium composite oxide, a modified lithium titanate material, a preparation method and an application thereof. Background technique [0002] In recent years, spinel-type lithium titanate materials have received extensive attention. Since the material does not change in volume during charging and discharging, it has excellent cycle life; in addition, the lithium titanate material has high safety because it has a lower occurrence rate compared with conventional carbon anode materials. The possibility of lithium dendrites; in addition, since the lithium titanate of the spinel structure is a ceramic material, the battery does not have the efficiency of thermal diffusion. [0003] However, this material also has intrinsic defects: 1) The ionic conductivity and electronic conductivity of the spinel lithium titanate material are relatively low, which affects the battery rate performance and cycle life; 2) The material has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/052
CPCH01M4/366H01M4/485H01M4/624H01M4/628H01M10/052Y02E60/10
Inventor 刘佳丽周兰李旺于维珂
Owner SHANGHAI ELECTRICGROUP CORP
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