Preparation method of carbon-coated mesoporous lithium titanium phosphate

A technology of carbon-coated mesoporous lithium titanium phosphate and phytic acid, which is applied to electrical components, battery electrodes, circuits, etc., can solve problems such as carbon-coated mesoporous lithium titanium phosphate, and achieve improved electrochemical performance and large Effect of specific surface area and short synthetic route

Active Publication Date: 2016-03-02
济南智和弘盛光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Preparation method of carbon-coated mesoporous lithium titanium phosphate
  • Preparation method of carbon-coated mesoporous lithium titanium phosphate
  • Preparation method of carbon-coated mesoporous lithium titanium phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A method for preparing carbon-coated mesoporous lithium titanium phosphate, the steps are as follows:

[0042] Add 2.1 mL of tetrabutyl titanate to 50 mL of the mixed solution of n-butanol / absolute ethanol with a volume ratio of 1:1, stir to dissolve, and obtain mixed solution A;

[0043] Add 1.48mL of 50wt% phytic acid and 0.15g of lithium hydroxide to 10mL of distilled water, stir to dissolve, and obtain mixed solution B;

[0044] Under the condition of stirring at 100 rpm, the mixed liquid B was added dropwise to the mixed liquid A, and the stirring was continued for 1 hour to obtain the mixed liquid C;

[0045] The mixed solution C is suction filtered, and the obtained solid is placed in a 40°C blast drying oven and dried for 10 hours to obtain solid powder D;

[0046] Transfer the solid powder D to a ceramic crucible, place the crucible in a tube furnace, and heat up from room temperature to 750℃ in a nitrogen atmosphere, keep it for 2h, and the heating rate is 5℃min -1 , Na...

Embodiment 2

[0048] A method for preparing carbon-coated mesoporous lithium titanium phosphate, the steps are as follows:

[0049] Add 2 mL of tetraisopropyl titanate to 60 mL of a 4:1 volume ratio of isobutanol / absolute ethanol mixed solution, stir to dissolve, and obtain a mixture A;

[0050] Add 1.48mL of 50wt% phytic acid and 0.22g of lithium acetate to 10mL of distilled water, stir to dissolve, and obtain mixed solution B;

[0051] Under the condition of stirring at 400 rpm, drop the mixed solution B into the mixed solution A, and continue to stir for 2 hours to obtain the mixed solution C;

[0052] The mixed solution C is suction filtered, and the obtained solid is placed in a blast drying oven at 80°C and dried for 6 hours to obtain solid powder D;

[0053] Transfer the solid powder D to a ceramic crucible, place the crucible in a tube furnace, and heat up from room temperature to 750°C in an argon atmosphere, hold for 3 hours, and increase the temperature at a rate of 5°C min -1 , Natural co...

Embodiment 3

[0055] A method for preparing carbon-coated mesoporous lithium titanium phosphate, the steps are as follows:

[0056] Add 2 mL of tetraisopropyl titanate to 60 mL of a mixture of isobutanol / absolute ethanol with a volume ratio of 3:1, stir to dissolve, and obtain a mixture A;

[0057] Add 1.48mL of 50wt% phytic acid and 0.78g of lithium sulfate monohydrate to 10mL of distilled water, stir to dissolve them, and obtain mixed solution B;

[0058] Under the condition of stirring at 300 rpm, drop the mixed liquid B into the mixed liquid A and continue to stir for 2 hours to obtain the mixed liquid C;

[0059] The mixed solution C is suction filtered, and the obtained solid is placed in a 60°C blast drying oven and dried for 6 hours to obtain solid powder D;

[0060] Transfer the solid powder D to a ceramic crucible, place the crucible in a tube furnace, and heat up from room temperature to 750°C in an argon atmosphere, keep it for 4 hours, and heat up at a rate of 5°C min -1 , Natural coolin...

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Abstract

The invention relates to a preparation method of carbon-coated mesoporous lithium titanium phosphate. The preparation method includes the following steps that firstly, titanate is dissolved in a mixed solution of butyl alcohol and absolute ethyl alcohol, and mixed liquor A is obtained; secondly, metal lithium salt and phytic acid are dissolved in distilled water, and mixed liquor B is obtained; thirdly, the mixed liquor B is dripped into the mixed liquor A with stirring at room temperature, stirring continues to be preformed for 1-2 h, and mixed liquor C is obtained; fourthly, the mixed liquor C is subjected to solid-liquid separation, an obtained solid is dried, and solid powder D is obtained; fifthly, the powder D is subjected to heat treatment in inert gas, and carbon-coated lithium titanium phosphate is obtained. Obtained carbon-coated mesoporous lithium titanium phosphate has a large specific surface area and an obvious mesoporous feature, which is beneficial to improving the electrochemical performance of carbon-coated mesoporous lithium titanium phosphate used as a lithium battery electrode material.

Description

Technical field [0001] The invention relates to a preparation method of carbon-coated mesoporous lithium titanium phosphate, belonging to the technical field of preparation of mesoporous materials and lithium battery electrode materials. Background technique [0002] Compared with lead-acid, nickel-cadmium and nickel-metal hydride batteries, rechargeable lithium-ion batteries (lithium batteries for short) have the characteristics of high energy density, long cycle life and light weight (N.Alias, AA Mohamad, J .PowerSources274(2015)237-251.), has been widely used in portable instruments and electronic devices; however, the current organic lithium batteries using organic electrolytes have the disadvantages of flammability, harsh assembly conditions, and high production costs. Limit their application in large-scale energy storage systems (such as electric locomotives, smart grids, etc.) (Xiao, Zeng, Q. Liu, M. Chen, L. Leng, T. Shu, L. Du, H. Song, S. Liao, Electrochimica Acta177 (...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/625H01M2004/021Y02E60/10
Inventor 盖利刚孙家香姜海辉
Owner 济南智和弘盛光电科技有限公司
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