Li4Ti5O12 materials with spinel structure and preparation process and use thereof

A spinel structure, 10ppm-5wt.% technology, applied in the field of electrochemistry, can solve the problems of electrode capacity decline, voltage hysteresis, inability to significantly improve Li, etc., and achieve improved electrical conductivity, stable structure, and excellent fast charge-discharge performance. Effect

Inactive Publication Date: 2006-09-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the above methods can improve the conductivity, they cannot significantly improve the Li 4 Ti 5 o 12 Lithium intercalation and deintercalation are reversible, and there is obvious voltage hysteresis in practical applications
In addition, the capacity of the electrode has also decreased, and further improvement is necessary

Method used

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  • Li4Ti5O12 materials with spinel structure and preparation process and use thereof
  • Li4Ti5O12 materials with spinel structure and preparation process and use thereof
  • Li4Ti5O12 materials with spinel structure and preparation process and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix the raw materials lithium carbonate and titanium dioxide in a molar ratio Li:Ti=0.85:1, and mix with 10% sucrose, add it to the mixing tank, add an appropriate amount of agate balls, seal the mixing tank, and put it on the ball mill at 300 rpm ball milling at a high speed for 12 hours to obtain a homogeneously mixed raw material. Then it was heated in a muffle furnace at 750°C for 12 hours to decompose the raw materials. The temperature was raised to 850° C. for 24 hours, and then the furnace was allowed to cool down to room temperature. Get the Li spinel structure 4 Ti 5 o 12 . figure 1 It is the XRD pattern of the obtained product, compared with the following comparative example 1, the addition of additives does not change Li 4 Ti 5 o 12 The crystal structure, maintained with Li 4 Ti 5 o 12 All the diffraction peaks can be identified according to the standard XRD spectrum of the same crystal structure, and no impurity peaks of additives and their pyrolys...

Embodiment 2

[0031] Mix the raw materials lithium carbonate and titanium dioxide in a molar ratio of Li:Ti=0.85:1, and mix with 10% sucrose, add to the mixing tank, add an appropriate amount of agate balls, seal the mixing tank, and put it on the ball mill at 400 rpm ball milling at a high speed for 24 hours to obtain evenly mixed mixed raw materials. Then, under the protection of inert gas, it was heated in a tube furnace at 700°C for 18 hours to decompose the raw materials. The decomposed product is a black powder, which is uniformly ground and placed in a tube furnace again, and calcined at 900°C for 24 hours under the protection of an inert gas, and then the furnace is allowed to cool down to room temperature. get Li 4 Ti 5 o 12 . The carbon content in the material is 0.5wt.%, the reversible capacity is 120mAh / g, and it does not decay after 30 cycles.

Embodiment 3

[0033] The raw materials lithium carbonate and titanium dioxide are mixed according to the molar ratio Li:Ti=0.76:1, and mixed with 10% acetylene black, put into the mixing tank, add an appropriate amount of agate balls, seal the mixing tank, and put it on the ball mill at 300 rpm Minute speed ball milling for 24 hours to obtain evenly mixed mixed raw materials. Then it was heated in a muffle furnace at 750°C for 12 hours to decompose the raw materials. The temperature was raised to 900° C. for 24 hours, and then the furnace was allowed to cool down to room temperature. Li with a spinel structure 4 Ti 5 o 12 . The material has a capacity of 145mAh / g and does not decay after 30 cycles.

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Abstract

The invention belongs to electrochemistry technology realm, concretely referring to the Method for preparation of a spinel structure Li4Ti5O12, the getted Li4Ti5O12 material by this method and its application. The Process for preparing of Li4Ti5O12 by this invention is simple, the realization is easy, the souce of raw material is wide, and the cost is low. Adding additive can control the appearance and crystal structure effectively, improving electrochemistry performance of product. The getted material has the advantage of high specific capacity, good circulatory performance, high charging and discharging efficiency and so on. This kind of material can be used as negative electrode material of diversified lithium ion battery widely, and as electrode material of capacitor.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, in particular to a spinel structure Li 4 Ti 5 o 12 The preparation method of the material, specifically the method is to prepare the spinel structure Li by adding additives 4 Ti 5 o 12 . The present invention also relates to the spinel structure Li obtained by the above method 4 Ti 5 o 12 Material. And the application of this material as the application of various lithium ion battery negative electrode materials or capacitor electrode materials. Background technique [0002] It is well known that the spinel structure Li 4 Ti 5 o 12 (or Li 1.33 Ti 1.67 o 4 ) as a promising anode material has attracted more and more attention in the industry, mainly because of the spinel structure Li 4 Ti 5 o 12 The material has a high theoretical capacity, is environmentally friendly, has good cycle performance, outstanding structural stability and zero-strain performance, and is conside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00H01M4/58H01G4/008H01M4/485
CPCY02E60/10
Inventor 王高军赵娜红吴宇平
Owner FUDAN UNIV
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