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A preparation method of lithium titanate/polyaniline composite material with good rate performance

A rate performance, composite material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of difficult large-scale production, complicated preparation process, etc., achieve good crystallinity, shorten the preparation period, and improve the rate. performance effect

Active Publication Date: 2018-08-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation process, the polymerization temperature of aniline is 30°C, and finally it needs to be washed and soaked repeatedly with different concentrations of HCl to achieve the purpose of HCl doping, which complicates the preparation process and makes it difficult to produce on a large scale

Method used

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  • A preparation method of lithium titanate/polyaniline composite material with good rate performance
  • A preparation method of lithium titanate/polyaniline composite material with good rate performance
  • A preparation method of lithium titanate/polyaniline composite material with good rate performance

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preparation example Construction

[0031] A preparation method of a lithium titanate / polyaniline composite material with good rate performance, comprising the following steps:

[0032] 1) Drop a lithium-containing solution with a lithium ion concentration of 0.2 to 5 mol / L into tetrabutyl titanate, and magnetically stir at 20 to 100°C for 20 to 120 minutes to prepare emulsion A, in which Li The ratio of the amount of substance to Ti is (0.7~1.5):1, wherein the lithium-containing solution is an aqueous solution of lithium carbonate, lithium oxalate, lithium acetate or lithium hydroxide;

[0033] 2) placing the emulsion A in an oven at 70-100°C for 1-48 hours to obtain a solid product B;

[0034] 3) Grinding the solid product B, placing it in a muffle furnace, raising the temperature to 400-1000°C at a heating rate of 6-10°C / min, keeping it warm for 2-15 hours, and then cooling to room temperature to obtain lithium titanate C;

[0035] 4) Add lithium titanate C to distilled water and ultrasonically disperse for ...

Embodiment 1

[0043] (1) Slowly drop a lithium oxalate solution with a lithium ion concentration of 0.2 mol / L into tetrabutyl titanate, and stir magnetically at 20°C for 120 minutes to prepare emulsion A, in which Li and Ti The ratio of the amount of substance is 0.7:1;

[0044] (2) Put the emulsion A into an oven for reaction, the temperature of the oven is 80° C., and take out the solid product from the oven after 1 hour to obtain the solid product B;

[0045] (3) Grinding the solid product B, placing it in a muffle furnace, raising the temperature to 600°C at a heating rate of 6°C / min for heat treatment for 2 hours, and then cooling to room temperature to obtain lithium titanate C;

[0046] (4) Add lithium titanate C to distilled water and ultrasonically disperse for 1 hour to obtain a lithium titanate aqueous solution, and then add the surfactant cetyltrimethylammonium bromide according to the mass ratio of lithium titanate C:surfactant of 1:0.1 , to obtain a solution D, wherein 1 mol ...

Embodiment 2

[0053] (1) Slowly drop lithium acetate solution with a lithium ion concentration of 1 mol / L into tetrabutyl titanate, and magnetically stir at 100°C for 20 minutes to prepare emulsion A, the substance of Li and Ti in emulsion A The ratio of the quantity is 0.85:1;

[0054] (2) Put the emulsion A into an oven for reaction, the temperature of the oven is 70° C., after 5 hours, the product that has become solid is taken out from the oven to obtain the solid product B;

[0055] (3) Grinding the solid product B, placing it in a muffle furnace, raising the temperature to 1000°C at a heating rate of 10°C / min for heat treatment for 8 hours, and then cooling to room temperature to obtain lithium titanate C;

[0056] (4) Add lithium titanate C to distilled water and ultrasonically disperse for 2 hours to obtain a lithium titanate aqueous solution, and then add the surfactant sodium dodecylbenzenesulfonate according to the mass ratio of lithium titanate C:surfactant of 1:0.15 , to obtai...

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Abstract

The invention discloses a preparation method of lithium titanate and polyaniline composite with good rate capability, comprising: dropping lithium-containing solution into tetrabutyl titanate solution to produce emulsion A; reacting the emulsion A in a dryer until the emulsion turns into solid product B; grinding the solid product B, and thermally treating to obtain lithium titanate C; ultrasonically dispersing the lithium titanate and distilled water to obtain lithium titanate solution, adding a certain amount of surfactant to obtain solution D; dropping polyaniline into the solution D to obtain mixed solution E; stirring the mixed solution E in cold water bath, and dropwise adding hydrochloric solution to obtain mixed solution F; dropwise adding a catalyst and oxidant mixed solution into the solution F to obtain solution G; magnetically stirring the solution G for a certain time, adding a reaction terminator into the G solution, and stirring to obtain suspension H; centrifuging the suspension H to obtain final precipitate, and vacuum drying the precipitate to obtain the lithium titanate and polyaniline composite.

Description

technical field [0001] The invention belongs to the technical field of battery electrode materials, and in particular relates to a preparation method of a lithium titanate / polyaniline composite material with good rate performance. Background technique [0002] Lithium-ion secondary batteries have developed rapidly since their appearance at the end of the last century, and have attracted the attention of many well-known companies, and vigorously researched and developed them into commercial production. At present, they have a certain proportion of applications in the field of electric vehicles. Lithium-ion batteries have great commercial prospects in civilian products such as electric vehicles and electric bicycles, and also have significant applications in the aerospace field. This requires the battery to have high reliability and low-temperature working performance, and also requires the battery to have a long cycle life, high energy density, and small volume and mass. Spi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/624H01M10/0525Y02E60/10
Inventor 黄剑锋李瑞梓惠亚妮李文斌许占位曹丽云李嘉胤杨欣
Owner SHAANXI UNIV OF SCI & TECH
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