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Nano magnesium sulfide loaded graphene composite material, and preparation method thereof

A composite material and graphene technology, applied in the direction of electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of cycle performance attenuation, uneven particle size, capacity decline, etc., and achieve cycle stability, lithium storage specific capacity, and The effect of improving electrical conductivity

Inactive Publication Date: 2017-03-22
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnesium sulfide particles prepared by this method are micron-sized, with uneven particle size and poor conductivity, which leads to agglomeration during the charge-discharge cycle process, cycle performance attenuation, and especially serious capacity decline at high current densities; and micron-sized magnesium sulfide in During the alloying process, the capacity contributed by the relatively large particles is limited

Method used

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  • Nano magnesium sulfide loaded graphene composite material, and preparation method thereof
  • Nano magnesium sulfide loaded graphene composite material, and preparation method thereof
  • Nano magnesium sulfide loaded graphene composite material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add 2.0 ml organic magnesium, 30.0 mg graphene, and 40 ml cyclohexane into an autoclave, add hydrogen at 20 bar, heat to 200 °C, and react for 8 h to obtain nano-magnesium hydride particles uniformly grown on the surface of graphene ;

[0019] (2) Place 60 mg of graphene-supported nano-magnesium hydride and 88 mg of sulfur powder in quartz boats respectively, and under the protection of nitrogen atmosphere, carry out a temperature program in a tube furnace at 5°C / min to 300°C for the vulcanization reaction. 5 h to obtain graphene-supported nano-magnesium sulfide;

[0020] (3) Do XRD test and SEM analysis on the final sample, such as figure 1 and figure 2 shown;

[0021] (4) Electrochemical performance test of the graphene-supported nano-magnesium sulfide composite negative electrode material prepared in Example 1:

[0022] Add composite materials: conductive carbon: PVDF ratio of 80:10:10 to make slurry, evenly spread on the copper sheet and dry in vacuum at 12...

Embodiment 2

[0024] (1) Add 2.0 ml organic magnesium, 40.0 mg graphene, and 40 ml cyclohexane into an autoclave, add hydrogen at 20 bar, heat to 200 °C, and react for 8 h to obtain nano-magnesium sulfide particles uniformly grown on the surface of graphene ;

[0025] (2) Place 40 mg of graphene-supported nano-magnesium hydride and 35 mg of sulfur powder in quartz boats respectively, and under the protection of nitrogen atmosphere, carry out a temperature program in a tube furnace at 6 °C / min to 350 °C for vulcanization reaction 4 h to obtain graphene-supported nano-magnesium sulfide;

[0026] (3) Electrochemical performance test of the graphene-loaded nano-magnesium sulfide composite negative electrode material prepared in Example 2:

[0027] Add composite materials, conductive carbon, and PVDF slurry (mass ratio is 80:10:10), evenly spread on copper sheet, and vacuum dry at 120 °C for 24 h to prepare electrodes. Take 2025 button battery case, the separator is PP / PE / PP, and use 1 mol / L L...

Embodiment 3

[0029] (1) Add 2.0 ml organic magnesium, 40.0 mg graphene, and 40 ml cyclohexane into an autoclave, add hydrogen at 30 bar, heat to 150 °C, and react for 8 h to obtain nano-magnesium sulfide particles uniformly grown on the surface of graphene ;

[0030] (2) Place 40 mg of graphene-supported nano-magnesium hydride and 25 mg of sulfur powder in a quartz boat, and under the protection of a nitrogen atmosphere, carry out a temperature program in a tube furnace at 5 °C / min to 350 °C for the vulcanization reaction. 6 h to obtain graphene-supported nano-magnesium sulfide;

[0031] (3) Electrochemical performance test of the graphene-loaded nano-magnesium sulfide composite negative electrode material prepared in Example 2:

[0032] Add composite materials, conductive carbon, and PVDF slurry (mass ratio is 80:10:10), evenly spread on copper sheet, and vacuum dry at 120 °C for 24 h to prepare electrodes. Take 2025 button battery case, the separator is PP / PE / PP, and use 1 mol / L LiPF ...

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Abstract

The invention belongs to the technical field of lithium ion battery electrode material, and more specifically relates to a nano magnesium sulfide loaded graphene composite material, and a preparation method thereof. According to the preparation method, nano magnesium hydride dispersed on the surface of graphene is taken as a precursor, elementary sulfur is taken as a sulfur source, and thermal evaporation and high temperature vulcanization are adopted to prepare the nano magnesium sulfide loaded graphene composite material. In the nano magnesium sulfide loaded graphene composite material, nano magnesium sulfide possesses relatively high lithium storage activity and theoretical capacity; flexible thin graphene is used for ensuring uniform dispersion of nano magnesium sulfide, ion and electron transmission speed is increased, and electrical conductivity is increased; domain limitation effect of graphene on magnesium sulfide particles is beneficial for relieving volume expansion of magnesium sulfide particles in lithium intercalation and de-intercalation process, and relieving agglomeration of active materials. According to the preparation method, the synergistic effect of nanocrystallization and graphene is capable of improving stability of magnesium sulfide in charge-discharge process, and providing the lithium ion battery electrode material with relatively high capacity and electrochemical cyclic stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to a lithium-ion battery negative electrode material loaded with graphene nano-magnesium sulfide (MgS / GNs) and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, light weight, small size, no memory effect, long cycle life, and low self-discharge rate. They are considered to be promising new energy sources for hybrid electric vehicles and portable electronic devices. As the main component of the battery, the structure and performance of the electrode material determine the electrochemical performance of the lithium-ion battery such as energy density and power density, which is the focus of research in the field of lithium-ion batteries. The current commercial lithium-ion battery anode material is mainly graphite, which has a low theoretical specific capacity (372 ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 余学斌张宝萍夏广林
Owner FUDAN UNIV
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