Preparation method of cobalt sulfide/three-dimensional nitrogen-doped macroporous graphene and negative electrode material of lithium ion battery

A nitrogen-doped, graphene technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of easy decay of discharge capacity, and achieve excellent structural stability, short synthesis period, and stress relief effects.

Inactive Publication Date: 2019-02-19
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that the discharge capacity is easily attenuated when the composite material of CoS and graphene is used as the negative electrode material of lithium

Method used

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  • Preparation method of cobalt sulfide/three-dimensional nitrogen-doped macroporous graphene and negative electrode material of lithium ion battery
  • Preparation method of cobalt sulfide/three-dimensional nitrogen-doped macroporous graphene and negative electrode material of lithium ion battery
  • Preparation method of cobalt sulfide/three-dimensional nitrogen-doped macroporous graphene and negative electrode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] First prepare three-dimensional nitrogen-doped macroporous graphene:

[0031] Dissolve 120.0 mg of graphene oxide in 60 ml of deionized water, and ultrasonically disperse at 40 KHz for 10 min, then add 0.3 g of urea to the above solution, continue ultrasonically dispersing for 2 h, and then quickly transfer it to In a 100 ml polytetrafluoroethylene-lined stainless steel autoclave, set the temperature at 180 °C, and the reaction time is 12 h. After the reaction, cool to room temperature, take out the solid phase and freeze-dry for 36 h, and finally place it in a tubular high-temperature sintering furnace Calcined at 800 °C for 2 h under the protection of argon to obtain three-dimensional nitrogen-doped macroporous graphene,

[0032] 2. Preparation of CoS / 3DNMG composites:

[0033] (a) Weigh 0.2379 mg of cobalt chloride hexahydrate CoCl 2 •6H 2 O and 0.3045 mg of thiourea CS(NH 2 ) 2 Add in 30.0 mL of a mixed solvent of ethylene glycol and water (volume ratio 1:4), a...

Embodiment 2

[0044] In this example, the CoS / 3DNMG composite material prepared in Example 1 and the CoS / 3DMG and CoS / 3DNMG prepared in Comparative Example were used as electrode active materials to carry out fabrication of lithium-ion electrodes, assembly of lithium-ion batteries and performance testing.

[0045] Using NMP as solvent, CoS / 3DNMG composite material was prepared from the prepared example as active material, acetylene black as conductive agent, PVDF as binder, the mass ratio of the three components was 8:1:1, magnetic stirring 8 h Prepare the slurry, and use the coating machine to evenly coat the prepared slurry on the copper foil, and keep it at 80 °C for 10 h. After drying, it was cut into CoS / 3DNMG electrode sheets with a microtome, and then vacuum-dried at 120 °C for 12 h to remove a small amount of moisture. After the electrode piece is weighed, it is directly used as the negative electrode of the lithium-ion battery to assemble the 2032-type button battery in an argon-fi...

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Abstract

The invention relates to a preparation method of cobalt sulfide/three-dimensional nitrogen-doped macroporous graphene and a negative electrode material of a lithium ion battery in the field of electrode materials. According to the preparation method, firstly, urea serving as a nitrogen source and graphene oxide are adopted for forming three-dimensional nitrogen-doped macroporous graphene; secondly, with cobalt chloride hexahydrate as a cobalt source, thiourea as a sulfur source and a mixture of ethylene glycol and water as a solvent, a simple solvothermal method is adopted for in-situ synthesis of a CoS/3DNMG composite material, wherein the CoS/3DNMG composite material is used as an active material of a negative electrode of the lithium ion battery. According to the CoS/3DNMG composite material prepared by means of the method, CoS is uniformly loaded on the pores and surface of three-dimensional nitrogen-doped macroporous graphene; the rich pore structures of three-dimensional nitrogen-doped macroporous graphene effectively buffer the volume expansion of cobalt sulfide in the charging and discharging process, transfer paths of electrons and ions are shortened in the charging and discharging process, and the migration rate of the lithium ions is increased; more defects are introduced into lattices of three-dimensional macroporous graphene through doping of nitrogen atoms, and the electrode reaction can be accelerated.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a method for preparing cobalt sulfide / three-dimensional nitrogen-doped macroporous graphene used as negative electrode active materials for lithium ion batteries and the negative electrode material for lithium ion batteries. Background technique [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s. As an important class of chemical batteries, the application of lithium-ion batteries has gradually expanded from mobile phones, notebook computers, digital cameras and portable small appliances to large power fields such as submarines, aerospace, aviation, and electric vehicles. Under the premise that global energy and environmental problems are becoming more and more serious, vehicles have switched to energy storage batteries as the main power source, and lithium-ion batteries are considered to be the first ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杨占军唐潇李娟
Owner YANGZHOU UNIV
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