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Method for preparing lithium titanate/titanium nitride composite material

A composite material, titanium nitride technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of increasing material modification process and increasing production cost, so as to reduce high-temperature burning time, reduce growth, and improve large-scale Effect of current charge and discharge performance

Inactive Publication Date: 2011-04-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are based on the existing Li 4 Ti 5 o 12 A layer of TiN film is prepared on the surface of the material to form a composite material, which increases the material modification process and increases the production cost

Method used

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  • Method for preparing lithium titanate/titanium nitride composite material
  • Method for preparing lithium titanate/titanium nitride composite material
  • Method for preparing lithium titanate/titanium nitride composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh Li according to the ratio of Li:Ti molar ratio of 0.8:1 2 CO 3 and anatase TiO 2 , then by urea and TiO 2Add urea in a molar ratio of 0.4 to 1, use absolute ethanol as a solvent, and ball mill in a planetary ball mill at a speed of 300 rpm for 3 hours. The resulting mixture is dried at room temperature and ground, and placed in a tube furnace In 8mmHg vacuum, the temperature was raised to 800°C at a rate of 10°C / min, kept for 1 hour and then cooled to room temperature. gain 4 Ti 5 o 12 / TiN composite electrode material.

[0028] Material performance characterization:

[0029] The crystal structure of the material was analyzed by XRD diffractometer figure 1 , it can be seen from the figure that the crystal structure of the composite electrode material is spinel Li 4 Ti 5 o 12 ; The particle size of the material was analyzed by scanning electron microscopy, and figure 2 , it can be seen from the figure that the composite electrode material is a submicro...

Embodiment 2

[0034] Weigh Li according to the ratio of Li:Ti molar ratio of 0.8:1 2 CO 3 and anatase TiO 2 , then by urea and TiO 2 The molar ratio of 0.2 to 1 was added to urea, and acetone was used as a solvent, and ball milled in a planetary ball mill at a speed of 300 rpm for 3 hours, and the resulting mixture was dried at room temperature and ground, and placed in a tube furnace. The temperature was raised to 750°C at a rate of 5°C / min under 8mmHg vacuum, held for 1 hour and then cooled to room temperature. gain 4 Ti 5 o 12 / TiN composite electrode material.

[0035] The electrochemical test was the same as in Example 1. The Li prepared by embodiment two method and proportioning 4 Ti 5 o 12 The battery made of / TiN composite material has a discharge capacity of 165.5mAh / g at 0.1C, a discharge capacity of 160.2mAh / g at 0.2C, and a discharge capacity of 140.4mAh / g at 0.5C.

Embodiment 3

[0037] Weigh Li according to the ratio of Li:Ti molar ratio of 0.8:1 2 CO 3 and anatase TiO 2 , then by urea and TiO 2 The molar ratio of 0.3 to 1 was added to urea, and acetone was used as a solvent, and ball milled in a planetary ball mill at a speed of 300 rpm for 3 hours, and the resulting mixture was dried at room temperature and ground, and placed in a tube furnace. The temperature was raised to 850°C at a rate of 5°C / min under argon flow, held for 1 hour and then cooled to room temperature. gain 4 Ti 5 o 12 / TiN composite electrode material.

[0038] The electrochemical test was the same as in Example 1. The Li prepared by embodiment three method and proportioning 4 Ti 5 o 12 The battery made of / TiN composite material has a discharge capacity of 165.2mAh / g at 0.1C, 158.2mAh / g at 0.2C, and 135.1mAh / g at 0.5C.

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Abstract

The invention belongs to the field of battery materials, and particularly relates to a cathode material for a lithium battery. The invention discloses a method for preparing a lithium titanate / titanium nitride composite material, which comprises the following steps of: grinding titanium dioxide serving as a titanium source, lithium titanate and solid nitrogen source uniformly in a disperse medium, drying at the temperature of between room temperature and 120 DEG C, and grinding; and firing under the protection of vacuum or inert gas, and then naturally cooling to obtain the lithium titanate / titanium nitride composite material, wherein the nitrogen source is selected from one or mixture of more than two (comprising two) of urea, biuret, cyanamide, dicyandiamide, melamine, cyanuric acid monamide and cyanuric acid diamide. The method for directly preparing the Li4Ti5O12 / TiN composite electrode material by adding the solid nitrogen source into the raw materials for preparing Li4Ti5O12 does not increase the preparation process, has low cost, simple process and low energy consumption, and is easy to realize scale production.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a negative electrode material applied to a lithium battery. Background technique [0002] In recent years, due to rising oil prices and serious global warming, low-carbon life has attracted more and more attention. Hybrid electric vehicles and pure electric vehicles have begun to enter people's lives, and lithium-ion batteries are the best candidates for the power of such vehicles. However, for such power vehicles, the key issue of lithium-ion batteries is safety performance. Since the existing lithium-ion batteries usually use carbon materials as negative electrodes, their lithium intercalation potential is very close to that of metal lithium. It is easy to grow dendrite lithium on the surface of the negative electrode, which brings safety hazards. Moreover, the carbon negative electrode is easy to form an SEI film during the first charge and discharge process, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/36
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 郑军伟周群赵晓梅桓佳君李亚斌周鋆
Owner SUZHOU UNIV
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