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Preparation method of copper-doped Li4Ti5O12-TiO2 regulation and control composite material

A composite material and element technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low conductivity, low charge and discharge capacity, poor rate performance, etc., to achieve high power density, high energy, The effect of excellent electrochemical performance

Inactive Publication Date: 2014-12-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since Li 4 Ti 5 o 12 As a negative electrode material for lithium-ion batteries, it has low electrical conductivity and low charge-discharge capacity (theoretical capacity is 175 mA h g -1 ), poor magnification performance and other shortcomings limit its practical application

Method used

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  • Preparation method of copper-doped Li4Ti5O12-TiO2 regulation and control composite material
  • Preparation method of copper-doped Li4Ti5O12-TiO2 regulation and control composite material
  • Preparation method of copper-doped Li4Ti5O12-TiO2 regulation and control composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A copper-doped control Li 4 Ti 5 o 12 -TiO 2 The preparation method of composite material, the steps are as follows:

[0022] 1) Add 3.40g of tetrabutyl titanate into 20mL of ethanol and stir vigorously to prepare solution A;

[0023] 2) Add 0.54g LiOH to 15mL distilled water and stir vigorously until it is completely dissolved to obtain solution B;

[0024] 3) Under strong stirring, slowly add solution B to solution A, stir for half an hour and then add copper acetate, the molar ratio of titanium, lithium and copper in the mixture is Li 4-x Cu x Ti 5 o 12 , where x=0.05, continue stirring for one hour to obtain a mixed solution;

[0025] 4) Put the above mixed solution in a high-pressure reactor and react at 160°C for 12 hours to obtain a precursor;

[0026] 5) The above precursor was calcined at 600°C for 4 hours to obtain copper-doped regulated Li 4 Ti 5 o 12 -TiO 2 composite material.

[0027] figure 1 for Li 4 Ti 5 o 12 -TiO 2 and Cu elements reg...

Embodiment 2

[0032] A copper-doped control Li 4 Ti 5 o 12 -TiO 2 The preparation method of composite material, the steps are as follows:

[0033] 1) Add 4.60g of tetrabutyl titanate to 20mL of ethanol and stir vigorously to prepare solution A;

[0034] 2) Add 0.56g LiOH to 20mL distilled water, stir vigorously until completely dissolved to obtain solution B;

[0035] 3) Under strong stirring, slowly add solution B to solution A, stir for half an hour and then add copper acetate, the molar ratio of titanium, lithium and copper in the mixture is Li 4-x Cu x Ti 5 o 12 , where x=0.05, continue stirring for one hour to obtain a mixed solution;

[0036] 4) Put the above mixed solution in a high-pressure reactor and react at 160°C for 24 hours to obtain a precursor;

[0037] 5) The above precursor was calcined at 600°C for 6h to obtain copper-doped regulated Li 4 Ti 5 o 12 -TiO 2 composite material.

[0038] The as-prepared doped copper elements control Li 4 Ti 5 o 12 -TiO 2 The...

Embodiment 3

[0040] A copper-doped control Li 4 Ti 5 o 12 -TiO 2 The preparation method of composite material, the steps are as follows:

[0041] 1) Add 5.40g of tetrabutyl titanate into 15mL of ethanol and stir vigorously to prepare solution A;

[0042] 2) Add 0.54g LiOH to 20mL distilled water, stir vigorously until completely dissolved to obtain solution B;

[0043] 3) Under strong stirring, slowly add solution B to solution A, stir for half an hour and then add copper acetate, the molar ratio of titanium, lithium and copper in the mixture is Li 4-x Cu x Ti 5 o 12 , where x=0.1, continue stirring for one hour to obtain a mixed solution;

[0044] 4) Put the above mixed solution in a high-pressure reactor and react at 160°C for 12 hours to obtain a precursor;

[0045] 5) The above precursor was calcined at 600°C for 4 hours to obtain copper-doped regulated Li 4 Ti 5 o 12 -TiO 2 composite material.

[0046] The as-prepared doped copper elements control Li 4 Ti 5 o 12 -TiO ...

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Abstract

The invention relates to a preparation method of copper-doped Li4Ti5O12-TiO2 regulation and control composite material. The method comprises the steps of feeding tetrabutyl titanate into ethyl alcohol to prepare a solution A; feeding lithium hydroxide into distilled water to prepare a solution B; slowly feeding the solution B into the solution A, stirring for half an hour, and then feeding copper acetate into the mixed solution; continuing to stir for an hour to obtain a mixed solution; putting the mixed solution into a high-pressure reaction kettle, and carrying out a reaction for 12-24 hours at the temperature of 160-180 DEG C to obtain a precursor; calcining the precursor for 2-6 hours at the temperature of 600 DEG C to obtain a target product. The preparation method has the advantages that the copper element with different contents is fed into the material, so that the crystal form and the content of TiO2 in a Li4Ti5O12-TiO2 system are effectively regulated and controlled; the prepared composite material is an anode material which is long in cycle life, and high in safety, energy and power density; the preparation method is simple in technology, easy in operation and high in practicality.

Description

technical field [0001] The present invention relates to the preparation method of lithium ion battery anode material, especially a kind of doping copper element control Li 4 Ti 5 o 12 -TiO 2 Methods of preparation of composite materials. Background technique [0002] Li 4 Ti 5 o 12 As a negative electrode material for lithium-ion batteries, it has a "zero-strain" lithium-deintercalation structure with long cycle life, stable charge-discharge voltage platform, and good safety performance. It is also cheap and easy to prepare, so it has attracted great attention from researchers. However, since Li 4 Ti 5 o 12 As a negative electrode material for lithium-ion batteries, it has low electrical conductivity and low charge-discharge capacity (theoretical capacity is 175 mA h g -1 ), poor rate performance and other shortcomings limit its practical application. Therefore, looking for a way to increase the Li 4 Ti 5 o 12 Excellent charge and discharge capacity and rate p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/1391
CPCH01M4/362H01M4/485H01M4/62H01M10/0525Y02E60/10
Inventor 王一菁焦丽芳袁华堂陈程成黄娅楠安翠华汪晓峰张昊
Owner NANKAI UNIV
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