Preparation method and application of high specific capacity lithium ion battery negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of negative electrode materials, such as charge and discharge specific capacity, poor cycle stability, and electrode material crushing, to improve electrochemical performance, conduct electricity, etc. Enhanced performance and large yield

Inactive Publication Date: 2019-08-09
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the disadvantages of poor charge-discharge specific capacity and cycle stability of lithium-ion battery negative electrode materials prepared in the prior art, and electrode material crushing

Method used

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  • Preparation method and application of high specific capacity lithium ion battery negative electrode material
  • Preparation method and application of high specific capacity lithium ion battery negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0036] Step 1: Preparation of ZIF8

[0037] Step 1, liquid A: 5mmol zinc nitrate hexahydrate, dispersed in 125ml methanol.

[0038] Solution B: 20 ​​mmol 2-methylimidazole, dispersed in 125 ml methanol.

[0039] Step 2: Liquid A is under magnetic stirring, pour liquid B into liquid A, stir for 3 minutes until uniform, and obtain ZIF8 mixed liquid.

[0040] Step 3, sealing the ZIF8 mixed solution and aging it for 24 hours to obtain the ZIF8 precursor solution.

[0041] Step 4: Wash the ZIF8 precursor by centrifugation, three times with methanol and three times with ethanol; dry at 60° C. overnight to obtain ZIF8.

[0042] The second step: preparation of ZnS hollow MOF material

[0043] 2 g of the prepared ZIF8 material and 1 g of pure sulfur were mixed, ground and sealed in a glass tube. Then heated at 300 °C for 12 hours and naturally cooled to room temperature to prepare porous carbon polyhedron embedded with ZnS nanoparticles, that is, ZnS hollow MOF material.

[0044] ...

Embodiment 2

[0050] Step 1: Preparation of ZIF8

[0051] Step 1, liquid A: 10 mmol zinc nitrate hexahydrate, dispersed in 250 ml methanol.

[0052] Solution B: 40 mmol 2-methylimidazole, dispersed in 250 ml methanol.

[0053] Step 2: Liquid A is under magnetic stirring, pour liquid B into liquid A, stir for 5 minutes until uniform, and obtain ZIF8 mixed liquid.

[0054] Step 3, sealing the ZIF8 mixed solution and aging it for 24 hours to obtain the ZIF8 precursor solution.

[0055] Step 4: Wash the ZIF8 precursor by centrifugation, three times with methanol and three times with ethanol; dry at 80° C. overnight to obtain ZIF8.

[0056] The second step: preparation of ZnS hollow MOF material

[0057] 4 g of the prepared ZIF8 material and 1 g of pure sulfur were mixed, ground and sealed in a glass tube. Then heated at 350 °C for 20 hours and naturally cooled to room temperature to prepare porous carbon polyhedron embedded with ZnS nanoparticles, that is, ZnS hollow MOF material.

[0058]...

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Abstract

The invention belongs to the technical field of material chemistry, particularly relates to a preparation method and application of a high specific capacity lithium ion battery negative electrode material, in particular to a preparation method of using ZIF8 sulfurized composite graphene as lithium ion battery negative electrode material. ZIF 8 is prepared, then a ZnS hollow MOF material is prepared, and the ZnS hollow MOF material is combined with graphene oxide to obtain ZnS hollow MOF material composite graphene. The ZIF8 material is sulfided in the preparation process to prepare porous composite of ZnS and organic ligand, and the composite graphene improves the conductivity of the composite as the lithium ion battery. The defects of poor charge / discharge specific capacity, poor cycle stability and crushing of the electrode material of the lithium ion battery negative electrode material in the prior art can be overcome.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and specifically relates to a preparation method and application of a high specific capacity lithium-ion battery negative electrode material, in particular to a preparation method of using ZIF8 vulcanized composite graphene as a lithium-ion battery negative electrode material. Background technique [0002] In recent decades, Li-ion batteries have played an increasingly important role in portable electronic devices because of their long service life, high energy density, high reversible capacity, and environmental friendliness. Graphite materials, as conventional anode materials in Li-ion batteries, are widely used due to their good electrochemical properties and structural stability during charge-discharge cycles. However, conventional graphitic carbon materials have severely hindered the development of Li-ion batteries due to their low theoretical capacity (372 mAh / g). In order to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/60H01M4/62H01M10/0525
CPCH01M4/362H01M4/5815H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 章国豪张永光
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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