Tin-based organic metal framework material, preparation method thereof and application of tin-based organic metal framework material in lithium ion battery negative electrode material

A lithium-ion battery, organic metal technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problem of high cost of tin-based metal-organic framework materials, improve rapid charge and discharge capacity, shorten migration path, the effect of reducing the preparation cost

Pending Publication Date: 2022-07-08
LUOYANG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the technical problem of the high cost of the existing tin-based metal-organic framework materials directly used as lithium battery negative poles, to provide a tin-based organic metal framework material and its preparation method and its use in lithium ion battery negative pole materials The application of this material is a one-dimensional micro-rod structure, which can be directly used as the negative electrode material of lithium-ion batteries, and has good electrochemical performance. Under the current density of 50mA / g, the reversible specific capacity reaches 813mAh / g, 1A / Under g current density, the reversible specific capacity can reach 570mAh / g

Method used

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  • Tin-based organic metal framework material, preparation method thereof and application of tin-based organic metal framework material in lithium ion battery negative electrode material
  • Tin-based organic metal framework material, preparation method thereof and application of tin-based organic metal framework material in lithium ion battery negative electrode material
  • Tin-based organic metal framework material, preparation method thereof and application of tin-based organic metal framework material in lithium ion battery negative electrode material

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preparation example Construction

[0034] A preparation method of a tin-based organometallic framework material, specifically comprising the following steps:

[0035] S1, the phthalic acid solution that concentration is 0.01-0.1mol / L is joined in the sodium hydroxide solution that concentration is 0.05-0.2mol / L, stir, obtain mixed solution;

[0036] Wherein, the molar ratio of the added amount of phthalic acid and sodium hydroxide ranges from 1:1 to 1:5.

[0037] S2. Sn with a concentration of 0.1-0.5mol / L 2+ The aqueous solution is dropped into the mixed solution at a rate of 0.1-2mL / min, and then continuously stirred at 10-50°C for 2-8h to obtain a white precipitate;

[0038] Among them, Sn 2+ The aqueous solution is stannous sulfate aqueous solution, stannous chloride aqueous solution or tin acetate aqueous solution;

[0039] Among them, phthalic acid: Sn 2+ The molar ratio of the added amount ranges from 1:1 to 1:3.

[0040] S3, the white precipitate is separated and washed by vacuum filtration, and fi...

Embodiment 1

[0043] A preparation method of a tin-based organometallic framework material, comprising the following steps:

[0044] S1. Add 150 mL of phthalic acid aqueous solution (0.08 mol / L) to 150 mL (0.16 mol / L) of sodium hydroxide aqueous solution, and stir evenly.

[0045] S2. Add 60 mL of 0.25 mol / L stannous sulfate aqueous solution dropwise to the solution in step S1, and continuously stir at 20° C. for 5 h to obtain a white precipitate.

[0046]S3. The white precipitate obtained in S2 is separated and washed by vacuum filtration, washed alternately with distilled water and ethanol for 3 times, and the isolate is vacuum-dried at 60° C. to obtain a tin-based organometallic frame material.

[0047] Scanning electron microscope image of the prepared product as figure 1 As shown, the material is a one-dimensional microrod-like structure with a smooth surface, the length of the microrod is 2-10 μm, and the diameter is 50-500 nm.

Embodiment 2

[0049] A preparation method of a tin-based organometallic framework material, comprising the following steps:

[0050] S1. Add 100 mL of phthalic acid aqueous solution (0.1 mol / L) to 200 mL (0.2 mol / L) of sodium hydroxide aqueous solution, and stir evenly.

[0051] S2. Add 50 mL (0.3 mol / L) stannous sulfate aqueous solution dropwise to the solution in step S1, and continue stirring at 25°C for 8 h to obtain a white precipitate.

[0052] S3. The white precipitate obtained in S2 is separated and washed by vacuum filtration, washed three times with distilled water, and the separated product is vacuum dried at 80° C. to obtain a tin-based organometallic framework material.

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Abstract

The invention discloses a tin-based organic metal framework material, a preparation method thereof and application of the tin-based organic metal framework material in a lithium ion battery negative electrode material, and the preparation method specifically comprises the following steps: S1, adding a phthalic acid solution into a sodium hydroxide solution, and uniformly stirring to obtain a mixed solution; s2, dropwise adding the Sn < 2 + > aqueous solution into the mixed solution, and then continuously stirring at 10-50 DEG C for 2-8 hours to obtain a white precipitate; and S3, separating and washing the white precipitate by using a vacuum filtration method, and finally drying the separated substance to obtain the tin-based organic metal framework material. The material is of a one-dimensional micron rod-shaped structure, can be directly used as a lithium ion battery negative electrode material and has relatively good electrochemical performance, the reversible specific capacity can reach 813mAh / g under the current density of 50mA / g, and the reversible specific capacity can reach 570mAh / g under the current density of 1A / g.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a tin-based organic metal frame material, a preparation method thereof, and an application in a lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have the characteristics of high single cell voltage, high energy density, and long cycle life, and are widely used in the fields of mobile devices, electronic products, and electric vehicles. Improving the electrochemical performance of negative electrode materials is a key means to improve the overall performance of lithium-ion batteries, and it is also the demand for the development of new-generation lithium-ion batteries. [0003] At present, graphite is mostly used in commercial lithium-ion battery anode materials, but graphite materials have the defect of low capacity. In addition, natural graphite needs to be mined, and artificial graphite preparation requires high heat tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/13H01M10/0525
CPCH01M4/60H01M4/13H01M10/0525Y02E60/10
Inventor 毋乃腾刘献明申金锞刘贵龙郭东磊李进傅红如
Owner LUOYANG NORMAL UNIV
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