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Preparation method for lithium titanate-titanium oxide composite electrode material

A composite electrode, titanium oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of limited charge and discharge specific capacity, and achieve the effects of easy control of particle size, fine particles, and simple process

Inactive Publication Date: 2013-10-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above approach can improve the electrochemical performance of lithium titanate to a certain extent, the theoretical capacity of lithium titanate is only 175mAh g -1 , so that its charge-discharge specific capacity is limited

Method used

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  • Preparation method for lithium titanate-titanium oxide composite electrode material
  • Preparation method for lithium titanate-titanium oxide composite electrode material
  • Preparation method for lithium titanate-titanium oxide composite electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Measure 25mL of ethylene glycol solution, heat it to 90°C in a water bath, and add a certain amount of polyvinylpyrrolidine under stirring conditions, wherein the concentration of polyvinylpyrrolidine is 0.0002-0.008 mol / liter;

[0034] (2) Add titanium tetraisopropoxide to the above solution, and stir magnetically for 5-45 minutes to obtain a clear solution; in addition, first dissolve lithium hydroxide in 5 mL of deionized water; then slowly add into the above clarified solution to obtain a solution containing a lithium-titanium mixture; wherein, the concentration of lithium hydroxide is 0.05-2.0 mol / liter, and the concentration of titanium tetraisopropoxide is 0.06-2.7 mol / liter;

[0035] (3) adding ammonia water with a mass fraction of 28% dropwise to the lithium-titanium mixture solution obtained in step (2) to form a milky white suspension, wherein the amount of ammonia water added is 5-80 ml / liter;

[0036] (4) Transfer the milky white suspension obtained abo...

Embodiment 2

[0039] (1) Measure 25mL of ethylene glycol solution, heat it to 90°C in a water bath, and add a certain amount of polyvinylpyrrolidine under stirring conditions, wherein the concentration of polyvinylpyrrolidine is 0.0012-0.008 mol / liter;

[0040] (2) Add tetrabutyl titanate to the above solution, and stir magnetically for 15-40 minutes to obtain a clear solution; in addition, first dissolve lithium hydroxide in 5 mL of deionized water; then slowly add into the above clarified solution to obtain a solution containing a lithium-titanium mixture; wherein, the concentration of lithium hydroxide is 0.12-1.8 mol / liter, and the concentration of tetrabutyl titanate is 0.13-2.3 mol / liter;

[0041] (3) adding ammonia water with a mass fraction of 28% dropwise to the lithium-titanium mixture solution obtained in step (2) to form a milky white suspension, wherein the amount of ammonia water added is 8-72 ml / liter;

[0042] (4) Transfer the milky white suspension obtained above to a polyt...

Embodiment 3

[0045] (1) Measure 25mL of ethylene glycol solution, heat it to 90°C in a water bath, add a certain amount of cetyltrimethylammonium bromide under stirring conditions, and the concentration of cetyltrimethylammonium bromide 0.0011-0.008 mol / liter;

[0046](2) Titanium tetraisopropoxide was added to the above solution, and magnetically stirred for 5-35 minutes to obtain a clear solution; in addition, lithium nitrate was first dissolved in 5 mL of deionized water; then slowly added to In the above clarified solution, a solution containing a lithium-titanium mixture is obtained; wherein, the concentration of lithium nitrate is 0.11-1.6 mol / liter, and the concentration of titanium tetraisopropoxide is 0.12-2.1 mol / liter;

[0047] (3) adding ammonia water with a mass fraction of 28% dropwise to the lithium-titanium mixture solution obtained in step (2) to form a milky white suspension, wherein the amount of ammonia water added is 8-72 ml / liter;

[0048] (4) Transfer the milky whit...

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Abstract

The invention discloses a preparation method for a lithium titanate-titanium oxide composite electrode material. The method comprises: taking lithium hydroxide and titanium tetraisopropoxide as reaction raw materials, polyvinylpyrrolidone (PVP) as a dispersant and a diaphragm, ammonia water as a pH conditioning agent, a mixed liquor of glycol and deionized water as a solvent, carrying out a hydrothermal reaction, centrifuging, washing, drying, and heat processing to obtain the lithium titanate-titanium oxide composite material. The prepared material is high in dispersibility, fine in particle, plentiful in phase interface, high in specific charge / discharge capacity, excellent in rate capability, and the like. The method has easy technology, easy-controlling phase compositions and particle size, and the like.

Description

technical field [0001] The invention relates to a method for preparing a lithium titanate-titanium oxide composite material for a negative electrode of a high-rate lithium-ion battery, and has broad application prospects in the fields of portable electronic equipment, power vehicles, power grid energy storage, and the like. Background technique [0002] Lithium-ion batteries are ideal power sources for portable electronics and the preferred energy source for electric and hybrid vehicles due to their high energy density, high output voltage, and long service life. The negative electrodes of current commercial lithium-ion batteries mainly use lithium-intercalated carbon materials. Since the electrode potential of carbon materials is very close to that of metal lithium, it is easy to cause the formation of "lithium dendrites", which brings a greater safety hazard. In addition, carbon anode materials will form an SEI film during the first charge and discharge, resulting in a lar...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCY02E60/10
Inventor 刘光印王慧远王栋刘雨畅
Owner JILIN UNIV