Inlaid polyaniline/H2Ti12O25 nanosheet composite material and preparation method thereof

A h2ti12o25, composite material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor electronic conductivity and high rate performance, and achieve the effects of good rate performance, good safety, and long cycle life.

Active Publication Date: 2016-10-26
TIANJIN B&M SCI & TECH
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Problems solved by technology

However, H 2 Ti 12 o 25 Poor electronic conductivity will limit its high-rate capability, therefore, in order to a

Method used

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  • Inlaid polyaniline/H2Ti12O25 nanosheet composite material and preparation method thereof
  • Inlaid polyaniline/H2Ti12O25 nanosheet composite material and preparation method thereof
  • Inlaid polyaniline/H2Ti12O25 nanosheet composite material and preparation method thereof

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preparation example Construction

[0024] Mosaic polyaniline / H of the present invention 2 Ti 12 o 25 A method for preparing a nanosheet composite material, comprising the steps of:

[0025] 1) With the assistance of polyols, the titanium source and the alkaline solution with a concentration of 1-6M were refluxed at 150-200°C for 6-10h to obtain Na 2 Ti 6 o 13 Nanosheet precursor;

[0026] 2) Wash Na with an acidic substance with a concentration of 0.01-0.1M 2 Ti 6 o 13 The nanosheet precursor obtained H several times 2 Ti 6 o 13 Nanosheets;

[0027] 3) put H 2 Ti 6 o 13 The nanosheets were heat-treated at 260 °C in an air atmosphere to obtain H 2 Ti 12 o 25 Nanosheets;

[0028] 4) put H 2 Ti 12 o 25 Disperse the nanosheets in 0.1-1M tetrabutylamine solution, and ultrasonicate for 6 hours at room temperature to form a suspension, in which the liquid-solid ratio is 70-300ml / g;

[0029] 5) Take a certain amount of aniline monomer and ammonium persulfate respectively, and dissolve them in 1M h...

Embodiment 1

[0037] A mosaic polyaniline / H 2 Ti 12 o 25 A method for preparing a nanosheet composite material, comprising the steps of:

[0038] 1) Dissolve 2g of polyethylene glycol-800 and 0.68g of titanium alkoxide in 48ml of ethanol solution to form a mixed solution, and reflux this solution with 24ml, 2mol / L of potassium hydroxide solution at 200°C After reacting for 6h, Na is formed 2 Ti 6 o 13 Nanosheet precursor;

[0039] 2) Wash Na with 0.01M formic acid 2 Ti 6 o 13 The nanosheet precursor obtained H 3 times 2 Ti 6 o 13 Nanosheets;

[0040] 3) Wash H with distilled water 2 Ti 6 o 13 nanosheets to remove excess formic acid, and baked at 80 °C for 24 h, followed by heat treatment at 260 °C to obtain the final product H 2 Ti 12 o 25 Nanosheets;

[0041] 4) Add 0.9g of H 2 Ti 12 o 25 The nanosheets were dispersed into 0.1M tetrabutylamine solution, and ultrasonicated for 6 hours at room temperature to form a suspension, wherein the liquid-solid ratio was 100ml / g;...

Embodiment 2

[0045] A mosaic polyaniline / H 2 Ti 12 o 25 A method for preparing a nanosheet composite material, comprising the steps of:

[0046] 1) Disperse 8g of ethylene glycol and 0.34g of rutile titanium dioxide in 48ml of ethanol solution to form a mixed solution, and react this solution with 24ml of 6M lithium hydroxide solution at 180°C for 8h to form Na 2 Ti 6 o 13 Nanosheet precursor;

[0047] 2) Wash Na with 0.05M oxalic acid 2 Ti 6 o 13 The nanosheet precursor obtained H 3 times 2 Ti 6 o 13 Nanosheets;

[0048] 3) Wash H with distilled water 2 Ti 6 o 13 nanosheets to remove excess formic acid, and baked at 80 °C for 24 h, followed by heat treatment at 260 °C to obtain the final product H 2 Ti 12 o 25 Nanosheets;

[0049] 4) Add 0.8g of H 2 Ti 12 o 25 The nanosheets were dispersed into a 0.5M tetrabutylamine solution, and ultrasonicated for 6 hours at room temperature to form a suspension, wherein the liquid-solid ratio was 200ml / g;

[0050] 5) Weigh a certa...

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Abstract

The invention discloses an inlaid polyaniline/H2Ti12O25 nanosheet composite material and a preparation method thereof. The preparation method comprises the following steps: under assistance of polyol, carrying out reflux reaction on a titanium source and an alkaline solution to obtain a Na2Ti6O13 nanosheet precursor; (2) washing the Na2Ti6O13 nanosheet precursor with acidic materials for a plurality of times to obtain H2Ti6O13 nanosheets; (3) carrying out heat treatment on the H2Ti6O13 nanosheets in an air atmosphere to obtain H2Ti12O25 nanosheets; (4)dispersing the H2Ti12O25 nanosheets in a tetrabutylammonium fluoride solution, and carrying out ultrasonic treatment for 6 hours at normal temperature to form suspension; (5) respectively dissolving a certain amount of aniline monomers and ammonium persulfate in 1M hydrochloric acid, then adding the mixture in the suspension obtained from the step (4), and reacting in ice-water bath to obtain the inlaid polyaniline/H2Ti12O25 nanosheet composite material. According to the structure, polyaniline is inlaid among layers of the H2Ti12O25 nanosheets to form the composite structure with the inlaid structure, wherein H2Ti12O25 has a nanosheet-shaped structure. The preparation method is simple and high in applicability, and the product is high in specific capacity, good in rate capability, long in cycle life and good in safety.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion secondary batteries, in particular to a mosaic polyaniline / H 2 Ti 12 o 25 Nanosheet composite material and method for its preparation. Background technique [0002] In order to realize the transformation of lithium-ion batteries from the application of 3C products to the application of large-scale high-power power consumption systems such as hybrid vehicles and modern weapons and equipment, the development of new electrode materials with high capacity, high rate performance and high safety is the key . Recent studies have shown that titanium oxide H 2 Ti 12 o 25 Not only has a high capacity (229mAh / g, much higher than lithium titanate Li 4 Ti 5 o 12 The theoretical capacity of 175mAh / g) and long cycle life and other advantages, and has a high lithium intercalation potential (1.55V (vs. Li + / Li)), the high lithium intercalation reaction potential can avoid the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M10/0525
CPCH01M4/364H01M4/485H01M10/0525Y02E60/10
Inventor 徐宁王春梅宋英杰
Owner TIANJIN B&M SCI & TECH
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