Cobalt-intercalated molybdenum sulfide secondary battery material and preparation method and application thereof

Abstract

The invention relates to a cobalt-intercalated molybdenum sulfide secondary battery material and a preparation method and an application thereof. A three-dimensional cobalt-intercalated molybdenum sulfide multi-level structure is prepared by adopting a chemical solution method; firstly, a cobalt salt, a molybdenum salt and a sulfur source are dispersed into a solvent to prepare a reaction liquid; and then the prepared reaction liquid is subjected to solvent thermal treatment to obtain the three-dimensional cobalt-uniformly-intercalated molybdenum sulfide multi-level structure which is self-assembled by graphene-like ultra-thin nanosheets, wherein the size of the multi-level structure is about 100nm. The invention also discloses a preparation method for the multi-level structure. The secondary battery material prepared by the method is stable in nanomaterial performance, and long in cycle life when the secondary battery material is used as a negative electrode material of a lithium ion battery and an electrode material of a supercapacitor.

Description

technical field

[0001] The invention belongs to the technical field of nanometer material preparation, and in particular relates to a cobalt intercalated molybdenum sulfide secondary battery material and a preparation method and application thereof. Background technique

[0002] Lithium-ion batteries (LIBs) and supercapacitors, as representatives of advanced energy storage technologies, play a vital role in portable electronic device power supplies, hybrid electric vehicles, and aviation technologies, both now and in the future. In view of the advantages of high energy density, large specific capacity, long cycle life, and environmental friendliness, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras, and digital video cameras. As the most widely used lithium-ion battery anode material, graphene material has a theoretical maximum capacity of 372mAhg -1 , the current progress of graphene materials is slow in electronic devices w...

Examples

Embodiment 1

[0038] (1) In a 100ml flask, add 0.5mmol of cobalt acetate, 1.0mmol of sodium molybdate, and 4mmol of sublimed sulfur to 40ml of ethylene glycol, stir vigorously at room temperature and keep for 1 hour to prepare poly Reaction solution with hierarchical structure.

[0039] (2) move the reaction solution prepared according to step (1) into a high-pressure reactor with a 50ml polytetrafluoroethylene liner, and after reacting at 200°C for 24 hours, the reactor is naturally cooled to 20°C, and after centrifugation, use This was washed several times with absolute ethanol and water, and freeze-dried to obtain a three-dimensional cobalt-intercalated molybdenum sulfide hierarchical structure.

Embodiment 2

[0042] (1) In a 100ml flask, add 1.5mmol of sodium molybdate and 4mmol of sublimed sulfur to 40ml of ethylene glycol, stir vigorously at room temperature and keep for 1 hour to prepare a reaction solution with a multi-level structure.

[0043] (2) move the reaction solution prepared according to step (1) into a high-pressure reactor with a 50ml polytetrafluoroethylene liner, and after reacting at 200°C for 24 hours, the reactor is naturally cooled to 20°C, and after centrifugation, use This is washed several times with absolute ethanol and water, and freeze-dried to obtain molybdenum sulfide nanoparticles. Figure 9 is a scanning electron micrograph of the obtained molybdenum sulfide.

Embodiment 3

[0045] (1) In a 100ml flask, 1.5mmol of cobalt acetate and 4mmol of sublimed sulfur were added to 40ml of ethylene glycol, stirred vigorously at room temperature and kept for 1 hour to prepare a reaction solution with a hierarchical structure.

[0046] (2) move the reaction solution prepared according to step (1) into a high-pressure reactor with a 50ml polytetrafluoroethylene liner, and after reacting at 200°C for 24 hours, the reactor is naturally cooled to 20°C, and after centrifugation, use This was washed several times with absolute ethanol and water, and freeze-dried to obtain a molybdenum sulfide hierarchical structure similar to a three-dimensional cobalt intercalation. Figure 10 is the resulting CoS 2 Scanning electron micrographs of nanomaterials.

technical field

[0001] The invention belongs to the technical field of nanometer material preparation, and in particular relates to a cobalt intercalated molybdenum sulfide secondary battery material and a preparation method and application thereof. Background technique

[0002] Lithium-ion batteries (LIBs) and supercapacitors, as representatives of advanced energy storage technologies, play a vital role in portable electronic device power supplies, hybrid electric vehicles, and aviation technologies, both now and in the future. In view of the advantages of high energy density, large specific capacity, long cycle life, and environmental friendliness, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras, and digital video cameras. As the most widely used lithium-ion battery anode material, graphene material has a theoretical maximum capacity of 372mAhg -1 , the current progress of graphene materials is slow in electronic devices w...

Examples

Embodiment 1

[0038] (1) In a 100ml flask, add 0.5mmol of cobalt acetate, 1.0mmol of sodium molybdate, and 4mmol of sublimed sulfur to 40ml of ethylene glycol, stir vigorously at room temperature and keep for 1 hour to prepare poly Reaction solution with hierarchical structure.

[0039] (2) move the reaction solution prepared according to step (1) into a high-pressure reactor with a 50ml polytetrafluoroethylene liner, and after reacting at 200°C for 24 hours, the reactor is naturally cooled to 20°C, and after centrifugation, use This was washed several times with absolute ethanol and water, and freeze-dried to obtain a three-dimensional cobalt-intercalated molybdenum sulfide hierarchical structure.

Embodiment 2

[0042] (1) In a 100ml flask, add 1.5mmol of sodium molybdate and 4mmol of sublimed sulfur to 40ml of ethylene glycol, stir vigorously at room temperature and keep for 1 hour to prepare a reaction solution with a multi-level structure.

[0043] (2) move the reaction solution prepared according to step (1) into a high-pressure reactor with a 50ml polytetrafluoroethylene liner, and after reacting at 200°C for 24 hours, the reactor is naturally cooled to 20°C, and after centrifugation, use This is washed several times with absolute ethanol and water, and freeze-dried to obtain molybdenum sulfide nanoparticles. Figure 9 is a scanning electron micrograph of the obtained molybdenum sulfide.

Embodiment 3

[0045] (1) In a 100ml flask, 1.5mmol of cobalt acetate and 4mmol of sublimed sulfur were added to 40ml of ethylene glycol, stirred vigorously at room temperature and kept for 1 hour to prepare a reaction solution with a hierarchical structure.

[0046] (2) move the reaction solution prepared according to step (1) into a high-pressure reactor with a 50ml polytetrafluoroethylene liner, and after reacting at 200°C for 24 hours, the reactor is naturally cooled to 20°C, and after centrifugation, use This was washed several times with absolute ethanol and water, and freeze-dried to obtain a molybdenum sulfide hierarchical structure similar to a three-dimensional cobalt intercalation. Figure 10 is the resulting CoS 2 Scanning electron micrographs of nanomaterials.

Images