Method for preparing lithium titanate (Li4Ti5O12) with large specific area

A large specific surface area, lithium titanate technology, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of small specific surface area of ​​lithium titanate, easy growth of product particles, easy collapse of pore structure, etc., to achieve The effect of low preparation cost, low cost and easy industrialization

Active Publication Date: 2012-07-25
常州泰特耐特新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high-temperature solid-phase method is simple to operate and easy to industrialize, but the product particles are easy to grow and the pore structure is easy to collapse under high-temperature reaction, which will lead to a very small specific surface area of ​​lithium titanate
The sol-gel method requires expensive and heavily polluting organic alkoxides as precursors, and the process is complex and difficult to produce on a large scale

Method used

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  • Method for preparing lithium titanate (Li4Ti5O12) with large specific area
  • Method for preparing lithium titanate (Li4Ti5O12) with large specific area
  • Method for preparing lithium titanate (Li4Ti5O12) with large specific area

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Embodiment 1

[0031] 5g K 2 TiO 3 Mix with 200ml of 1M hydrochloric acid solution, perform ion exchange at room temperature, and filter after 2 hours to obtain compound H 2 TiO 3 ; put 3g H 2 TiO 3 Place in 2M lithium hydroxide solution, stir or ultrasonically mix, in order to make the mix uniform, mix under the conditions of vacuum and 100°C water bath (30 minutes). Put the fully mixed reactants in a hydrothermal kettle, put them in a muffle furnace at 120°C for 10 hours, then filter them with suction and wash them with water to obtain Li 4 Ti 5 o 12 .

[0032] Gained Li 4 Ti 5 o 12 The BET and FESEM characterizations as figure 1 , figure 2 As shown, its BET specific surface area is 220 m 2 / g; pore volume 0.107m 3 / g; average pore size 3.3 nm.

[0033]

Embodiment 2～5

[0035] According to the substantially same method as embodiment 1, adopt H 4 Ti 5 o 12 or H 2 Ti 2 o 5 As the titanium source, change the lithium source and reaction conditions to prepare Li with different specific surface areas 4 Ti 5 o 12 , the specific conditions and product characteristics are shown in Table 1.

[0036]

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Abstract

The invention discloses a method for preparing lithium titanate (Li4Ti5O12) with a large specific area. The method includes using titanic acid H2TiO3, H4Ti5O12 or H2Ti2O5 as a titanium source, adding the titanic acid into 2-20M of soluble lithium salt aquatic liquor, and leading the titanic acid and the lithium salt liquor to be sufficiently mixed under the water bath and vacuum condition with the temperature ranging from 60 DEG C to 100 DEG C; and placing the mixed reactant liquid in a hydrothermal kettle, realizing hydrothermal reaction for 1 to 12 hours at the temperature ranging from 120 DEG C to 220 DEG C, taking out a reaction product, filtering the reaction product and obtaining the target object Li4Ti5O12. The specific surface area of the lithium titanate product ranges from 50m2 / g to 220m2 / g, the Li4Ti5O12 has the advantages of large specific surface area and excellent lithium battery performance, and a process of the method is environment-friendly, is low in energy consumption and applicable to industrial application, and the like.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of lithium titanate with a large specific surface area spinel structure. Background technique [0002] Lithium titanate material (Li 4 Ti 5 o 12 ) as a negative electrode material for lithium-ion batteries is a "zero-strain material". Compared with carbon materials that have been commercialized, it has the characteristics of high safety, high stability, long life and environmental protection. The anode material of a generation of lithium-ion batteries is widely used in new energy vehicles, electric motorcycles and applications requiring high safety, high stability and long cycle. [0003] We know that nanomaterials with different morphologies are closely related to their properties. According to literature reports, lithium titanate with a porous structure with a high specific surface area is beneficial to increase...

Claims

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Application Information

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IPC IPC(8): C01G23/00
Inventor 王昌松姚文俊庄伟施容华
Owner 常州泰特耐特新材料科技有限公司
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