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

A technology of lithium-ion batteries and organic frameworks, applied in battery electrodes, secondary batteries, circuits, etc., to achieve performance improvement, alleviate volume expansion effects, and promote research progress

Active Publication Date: 2020-06-26
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the direct application of tin-based metal-organic framework materials to battery materials.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Take by weighing stannous sulfate SnSO 4 (0.4mmol, 85.6mg) and 2,5-dihydroxyphthalic acid (0.2mmol, 54.8mg) mixture into a glass bottle, followed by adding 25mL of distilled aqueous solution containing lithium hydroxide (0.8mmol, 32mg), stirring Obtain a uniform mixture;

[0030] 2) Place the uniformly mixed mixed solution in an oven at 80°C for 72 hours, and then cool it down to room temperature naturally to obtain light yellow flaky crystals;

[0031] 3) The obtained crystals were washed with distilled water and ethanol, and dried naturally to obtain a tin-based metal-organic framework.

Embodiment 2

[0033] 1) Take by weighing stannous sulfate SnSO 4 (0.4mmol, 85.6mg) and 2,5-dihydroxyphthalic acid (0.1mmol, 27.4mg) mixture into a glass bottle, followed by adding 15mL of distilled aqueous solution containing lithium hydroxide (0.6mmol, 24mg), stirring Obtain a uniform mixture;

[0034] 2) Place the uniformly mixed mixed solution in an oven at 85°C for 48 hours, and then cool it down to room temperature naturally to obtain light yellow flaky crystals;

[0035] 3) The obtained crystals were washed with distilled water and ethanol, and dried naturally.

Embodiment 3

[0037] 1) Take by weighing stannous sulfate SnSO 4 (0.3mmol, 64.2mg) and 2,5-dihydroxyphthalic acid (0.1mmol, 27.4mg) mixture into a glass bottle, then add 45mL distilled aqueous solution containing lithium hydroxide (0.5mmol, 20mg), Stir evenly to obtain a mixture;

[0038] 2) Place the uniformly mixed mixture in an oven at 95°C for 24 hours, and then cool it down to room temperature naturally to obtain light yellow flaky crystals;

[0039] 3) The obtained crystals were washed with distilled water and ethanol, and dried naturally.

[0040] 2. Characterization of tin-based metal-organic frameworks

[0041] Get the crystals obtained in the above examples on a glass slide, select a suitable crystal under a microscope, test it on a Supernova type X-ray single crystal diffractometer, and use the Mo-Kα ray monochromatized by a graphite monochromator is the incident radiation source, with Diffraction points were collected by scanning, and their coordinates and anisotropy param...

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Abstract

The invention discloses a tin-based metal-organic framework, a preparation method thereof and an application of the tin-based metal-organic framework as a lithium ion battery negative electrode material. The chemical formula of the tin-based metal-organic framework is [Sn2 (dobpdc)] n, and the dobpdc is 2, 5-dihydroxy phthalic acid ions. The preparation method comprises the following steps: addingstannous sulfate (SnSO4) and 2, 5-dihydroxy phthalic acid into distilled water, and performing hydrothermal reaction to obtain a target product. The tin-based metal-organic framework synthesized by the method can be used as a lithium ion battery negative electrode material to be assembled into a CR2032 lithium ion button battery. The synthesis method has the advantages of simplicity, cheap and easily available raw materials, high yield and low cost. When the tin-based metal-organic framework is directly applied to a lithium ion battery negative electrode material, the volume expansion effectin the alloying process can be effectively relieved, and the specific capacity of the complex is maintained at 1018mAh g<-1> after 200 times of cycles under the charge-discharge current density of 200mA g<-1>. Good stability and excellent electrochemical performance are shown in a rate test.

Description

technical field [0001] The invention relates to the field of lithium-ion battery electrode materials, in particular to the synthesis of a novel tin-based metal-organic framework with good stability, a lithium-ion battery negative plate and a preparation method for the lithium-ion battery. Background technique [0002] Lithium-ion battery is an energy storage device that uses lithium ions as carriers to complete the conversion of chemical energy and electrical energy between the positive and negative electrodes of the battery. It has high energy density, long cycle life, no memory effect, small size, and is easy to carry, etc. With outstanding advantages, it has been widely used in portable electrical appliances such as mobile phones and notebook computers. With the development and promotion of new energy electric vehicles and energy storage grids, higher requirements are placed on the electrochemical properties of lithium-ion batteries. However, the theoretical lithium stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/60H01M10/0525
CPCH01M4/362H01M4/387H01M4/60H01M10/0525Y02E60/10
Inventor 师唯刘景维程鹏
Owner NANKAI UNIV
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