Graphene-based positive electrode material and preparation method thereof and lithium-sulfur battery

A cathode material, graphene-based technology, applied in the field of nanomaterials, can solve problems such as unsuitability for large-scale production, unsatisfactory firmness, and complicated steps, and achieve the effects of improving electrochemical performance, improving capacity stability, and improving conversion efficiency.

Active Publication Date: 2020-11-06
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Abstract
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  • Application Information

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Problems solved by technology

This method has certain requirements on equipment, and the steps are cumbersome and not suitable for large-scale production. In addition, there is another method to mix sublimated sulfur with mesoporous silica, and after secondary calcination, sulfur element is embedded in the pore diameter by capillary force to obtain silica sulfur complex
This method completes sulfur fixation by capillary force, but its firmness is still unsatisfactory

Method used

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  • Graphene-based positive electrode material and preparation method thereof and lithium-sulfur battery
  • Graphene-based positive electrode material and preparation method thereof and lithium-sulfur battery
  • Graphene-based positive electrode material and preparation method thereof and lithium-sulfur battery

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[0039] The invention provides a preparation method of a graphene-based positive electrode material, which can solve the technical problems of low sulfur load, poor conductivity, low specific capacity, and poor cycle stability of lithium-sulfur batteries.

[0040] The technical solution is:

[0041] A preparation method of graphene-based positive electrode material, comprising the following steps:

[0042]Disperse the MXene / graphene composite material, copper salt and sulfur source in the solvent to obtain the first mixed solution;

[0043] placing the first mixed solution under a closed pressure system, and performing a solvothermal reaction at 100°C to 180°C for 18h to 24h to prepare a copper sulfide / MXene / graphene nanocomposite material;

[0044] Mixing the copper sulfide / MXene / graphene nanocomposite material with elemental sulfur, and after grinding, place it at 155°C-180°C for 10h-18h to prepare a graphene-based positive electrode material;

[0045] The MXene is Ti 3 C ...

Embodiment 1

[0080] This embodiment provides a graphene-based positive electrode material and a preparation method thereof, and the specific steps are as follows:

[0081] Step 1, prepare MXene(Ti 3 C 2 ) / graphene composite

[0082] a) Preparation of few-layer MXene(Ti 3 C 2 ): Weigh 2g of lithium fluoride with an electronic balance, measure 40ml of HCl aqueous solution with a concentration of 9mol / L in a graduated cylinder, place them in plastic beakers at a constant temperature of 35°C, stir and dissolve for 30min, and then use an electronic balance to weigh the titanium-based MAX ( Ti 3 AlC 2 ) phase precursor 2g, slowly put into a plastic beaker at a constant temperature of 35°C and continue to stir for 24 hours; then add distilled water to the product, centrifuge at 4000 rpm for 5 minutes, repeat 5 times, and then sonicate in an ice bath for 1 hour, When the pH value is close to 7, the supernatant is collected to be the final product few-layer MXene (Ti 3 C 2 ), and finally fr...

Embodiment 2

[0093] This embodiment provides a graphene-based positive electrode material and a preparation method thereof, and the specific steps are as follows:

[0094] Step 1, prepare MXene(Ti 3 C 2 ) / graphene composite

[0095] a) Preparation of few-layer MXene(Ti 3 C 2 ): use a graduated cylinder to measure 40ml of HF aqueous solution with a mass fraction of 40%, pour it into a plastic beaker, and then use an electronic balance to weigh the titanium series MAX (Ti 3 AlC 2 ) phase precursor 2g, slowly put it into a plastic beaker with a constant temperature of 35°C under magnetic stirring and continue to react for 24h; then add distilled water to the product, centrifuge at 4000 rpm for 5 minutes, repeat 5 times, and then sonicate in an ice bath 1h, when the pH value was close to 7, the supernatant was collected to be the final product few-layer MXene (Ti 3 C 2 ), and finally freeze-dry the suspension to obtain graphene-like few-layer MXene (Ti 3 C 2 ) solid powder.

[0096] ...

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Abstract

The invention relates to a graphene-based positive electrode material and a preparation method thereof and a lithium-sulfur battery. The preparation method of the graphene-based positive electrode material comprises the following steps: dispersing an MXene/graphene composite material, a copper salt and a sulfur source in a solvent to obtain a first mixed solution; putting the first mixed solutioninto a closed pressure system, and carrying out solvothermal reaction at 100-180 DEG C for 18-24 hours to prepare a copper sulfide/MXene/graphene nano composite material; mixing the copper sulfide/MXene/graphene nano composite material with elemental sulfur, performing grinding, and performing standing at 155-180 DEG C for 10-18 hours to prepare a graphene-based positive electrode material; and the MXene is Ti<3>C<2>. The positive electrode material prepared by adopting the method can improve the electrochemical performance of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a graphene-based positive electrode material, a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] Nowadays, in order to meet the increasing demand for large-scale energy storage and sustainable use, it is imminent to develop new electrochemical energy storage systems. In the new energy storage system, the theoretical specific energy of a lithium-sulfur battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode can reach 2600Wh / kg (the theoretical specific capacities of lithium and sulfur are 3860mAh / g and 1675mAh / g, respectively). Much larger than the commercial secondary batteries used at this stage. Moreover, lithium-sulfur batteries have attracted extensive attention due to their outstanding advantages of high specific energy, low raw material cost, and environmental friendliness, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/052B82Y30/00B82Y40/00
CPCH01M4/628H01M4/625H01M4/624H01M4/38H01M10/052B82Y30/00B82Y40/00H01M2004/028Y02E60/10
Inventor 黄国家李悦杨波李茂东郭华超李仕平王志刚
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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