Method for preparing lithium titanate cathode material for lithium ion power batteries

A technology for power batteries and negative electrode materials, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve problems such as difficulty in industrial production, uneven mixing of solid-phase methods, and poor control of lithium-titanium stoichiometric ratio.

Inactive Publication Date: 2011-02-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] We prepare lithium titanate by hydrothermal high-temperature synthesis method: this method not only avoids the problem of uneven mixing in the solid phase method and the difficult control of l

Method used

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  • Method for preparing lithium titanate cathode material for lithium ion power batteries
  • Method for preparing lithium titanate cathode material for lithium ion power batteries
  • Method for preparing lithium titanate cathode material for lithium ion power batteries

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0027] Example 1,

[0028] Lithium hydroxide is prepared into a solution with a concentration of 10%, and at the same time, nano titanium dioxide powder mixed with Zr (or Sn, Ni, etc.) elements is added to it at the metering ratio Li:Ti=1.16:1 (metal elements account for 0.2 of the total %), mix well, and pour into a 2L autoclave for hydrothermal reaction. Hydrothermal reaction temperature: 150°C, reaction time: 48hr, pressure of the autoclave: 0.4Mpa. The hydrothermally obtained slurry was spray-dried, and the powder obtained after the treatment was sample A.

Example Embodiment

[0029] Example 2,

[0030] Lithium hydroxide is prepared into a solution with a concentration of 10%, and at the same time, nano titanium dioxide powder mixed with Zr (or Sn, Ni, etc.) elements is added to it at the metering ratio Li:Ti=1.16:1 (metal elements account for 0.2 of the total %), mix well, and pour into a 2L autoclave for hydrothermal reaction. Hydrothermal reaction temperature: 150°C, reaction time: 48hr, pressure of the autoclave: 0.4Mpa. The hydrothermally obtained slurry was spray-dried, and the powder obtained after the treatment was calcined in a high-temperature furnace at 700° C. for 20 hours. The sample obtained was B.

Example Embodiment

[0031] Example 3.

[0032] Lithium hydroxide is formulated into a solution with a concentration of 8%, and at the same time, nano titanium dioxide powder mixed with Zr (or Sn, Ni, etc.) elements is added to it at the metering ratio Li:Ti=1.16:1 (metal elements account for 0.2 of the total %), mix well, and pour into a 2L autoclave for hydrothermal reaction. Hydrothermal reaction temperature: 180°C, reaction time: 36hr, pressure of the autoclave: 0.9Mpa. The hydrothermally obtained slurry was spray-dried, and the powder obtained after the treatment was calcined in a high-temperature furnace at 800°C for 20 hours, and the obtained sample was C.

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Abstract

The invention discloses a method for preparing a lithium titanate cathode material for lithium ion power batteries, which is characterized by: mixing nano titanium dioxide or metatitanic acid doped with Zr, Sn and Ni and solution of lithium hydroxide in a Li to Ti molar ratio of 1.16:1 for performing a hydro-thermal reaction at 150 to 200 DEG C and under a pressure of 0.4 to 1.4MPa for 24 to 38 hours; performing spray drying and globulation; and calcining at 700 to 900 DEG C in a high-temperature furnace for 10 to 20 hours, and obtaining a lithium titanate with a spinel structure.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials of lithium ion batteries, and relates to a preparation method of lithium titanate, a negative electrode material for lithium ion power batteries. Background technique [0002] Lithium titanate (Li 4 Ti 5 o 12 ), with a spinel structure. In 1999, lithium-titanium composite oxide Li 4 Ti 5 o 12 A lot of researches have been started as negative electrode materials for lithium-ion batteries. At present, the carbon negative electrode material has been widely used in lithium-ion batteries, but it also has disadvantages, such as the potential of the carbon negative electrode is very close to that of lithium, and when the battery is overcharged, metal lithium may precipitate on the surface of the carbon electrode. Crystals can cause safety problems; the speed of releasing energy is not fast enough, and it is not suitable for equipment that requires instantaneous h...

Claims

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Application Information

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IPC IPC(8): C01G23/00
CPCY02E60/12Y02E60/10
Inventor 刘锦平郭西凤赵庆云赵洪李晓磊安峰宋晓莉
Owner CHINA NAT OFFSHORE OIL CORP
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