Novel negative electrode material of sodium-ion battery as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of new energies and discloses a novel negative electrode material of a sodium-ion battery as well as a preparation method and an application of the novel negative electrode material. The preparation method comprises the following steps: dissolving a carbon source and a molybdenum source in a solvent, heating to ensure a reaction to obtain a precursor Mo3(BTC)2, implementing in-situ carbonization to obtain a composition of a carbonization-molybdenum nanoparticle and an ultrathin graphene shell. The specific structure of the negative electrode material is that the carbonization-molybdenum nanoparticle is coated by the ultrathin graphene shell, wherein the diameter of the carbonization-molybdenum nanoparticle is 1-10nm. In the electrochemical reaction process of the negative electrode material with sodium, the conversion reaction with a sodium ion achieves disembedding of the sodium ion, the reversible disembedding sodium capacity, the excellent sodium storage performance, higher reversible capacity and better cycle performance are achieved, the preparation method is simple, the cost is low, the preparation method is environmentally friendly and can be applied to the sodium-ion battery, and more possibilities for the exploration of the negative electrode material of the sodium-ion battery are provided.

Description

technical field

[0001] The invention belongs to the technical field of new energy, and in particular relates to a novel negative electrode material for a sodium ion battery, a preparation method and application thereof. Background technique

[0002] At present, the energy problems in various countries are becoming more and more tense, and the demand is still increasing. In recent years, with the advancement of science and technology and reform and innovation, electronic equipment, power tools, electric vehicles, etc. have also developed rapidly. Exploring efficient, portable, safe and green Energy storage materials have become an inevitable development. Due to its high energy density, lithium-ion batteries have been widely used commercially, especially in power vehicles, portable power supplies, electronic devices, etc., but lithium resources are limited and expensive, and the demand for lithium continues The high cost limits the large-scale application of lithium-ion batte...

Examples

Embodiment 1

[0056] A composite of molybdenum carbide nanoparticles and ultrathin graphene shell (MoC@GS) anode material was synthesized by a two-step method. First prepare the precursor Mo 3 (BTC) 2 , and then the precursor product was in-situ carbonized in a quartz tube under an argon atmosphere to obtain the composite of molybdenum carbide nanoparticles and ultrathin graphene shells (MoC@GS), with a diameter of 1~ 10nm.

[0057] The specific operation is as follows:

[0058] Dissolve molybdenum hexacarbonyl and trimesic acid at a molar ratio of 1:13.6 in dimethyl fumarate, reflux reaction at 155°C under an argon atmosphere for more than 5 days, filter, wash and dry to obtain the precursor Mo 3 (BTC) 2 , and then placed the precursor in a quartz tube under an argon atmosphere for in-situ carbonization at 700-900°C for 5 hours, cooled to room temperature, washed with dimethyl fumarate, and dried to obtain molybdenum monocarbide nanoparticles and ultra-thin graphite ene-shell composi...

Embodiment 2

[0060] A composite of molybdenum carbide nanoparticles and ultrathin graphene shell (MoC@GS) anode material was synthesized by a two-step method. First prepare the precursor Mo 3 (BTC) 2 , and then the precursor product was in-situ carbonized in a quartz tube under an argon atmosphere to obtain the composite of molybdenum carbide nanoparticles and ultrathin graphene shells (MoC@GS), with a diameter of 1~ 10nm.

[0061] The specific operation is as follows:

[0062] Dissolve molybdenum hexacarbonyl and trimesic acid at a molar ratio of 1:10 in dimethyl fumarate, reflux reaction at 100°C under an argon atmosphere for more than 5 days, filter, wash and dry to obtain the precursor Mo 3 (BTC) 2 , and then place the precursor in a quartz tube under an argon atmosphere for in-situ carbonization at 500-1000°C for 2 hours, cool to room temperature, wash with dimethyl fumarate, and dry to obtain molybdenum monocarbide nanoparticles and ultra-thin graphite ene-shell composites (MoC...

Embodiment 3

[0064] A composite of molybdenum carbide nanoparticles and ultrathin graphene shell (MoC@GS) anode material was synthesized by a two-step method. First prepare the precursor Mo 3 (BTC) 2 , and then the precursor product was in-situ carbonized in a quartz tube under an argon atmosphere to obtain the composite of molybdenum carbide nanoparticles and ultrathin graphene shells (MoC@GS), with a diameter of 1~ 10nm.

[0065] The specific operation is as follows:

[0066] Dissolve molybdenum hexacarbonyl and trimesic acid at a molar ratio of 1:15 in dimethyl fumarate, reflux reaction at 200°C for more than 3 days under an argon atmosphere, filter, wash, and dry to obtain a precursor Mo 3 (BTC) 2 , and then placed the precursor in a quartz tube under an argon atmosphere for in-situ carbonization at 500-1000°C for 8 hours, cooled to room temperature, washed with dimethyl fumarate, and dried to obtain molybdenum monocarbide nanoparticles and ultra-thin graphite ene-shell composite...

technical field

[0001] The invention belongs to the technical field of new energy, and in particular relates to a novel negative electrode material for a sodium ion battery, a preparation method and application thereof. Background technique

[0002] At present, the energy problems in various countries are becoming more and more tense, and the demand is still increasing. In recent years, with the advancement of science and technology and reform and innovation, electronic equipment, power tools, electric vehicles, etc. have also developed rapidly. Exploring efficient, portable, safe and green Energy storage materials have become an inevitable development. Due to its high energy density, lithium-ion batteries have been widely used commercially, especially in power vehicles, portable power supplies, electronic devices, etc., but lithium resources are limited and expensive, and the demand for lithium continues The high cost limits the large-scale application of lithium-ion batte...

Examples

Embodiment 1

[0056] A composite of molybdenum carbide nanoparticles and ultrathin graphene shell (MoC@GS) anode material was synthesized by a two-step method. First prepare the precursor Mo 3 (BTC) 2 , and then the precursor product was in-situ carbonized in a quartz tube under an argon atmosphere to obtain the composite of molybdenum carbide nanoparticles and ultrathin graphene shells (MoC@GS), with a diameter of 1~ 10nm.

[0057] The specific operation is as follows:

[0058] Dissolve molybdenum hexacarbonyl and trimesic acid at a molar ratio of 1:13.6 in dimethyl fumarate, reflux reaction at 155°C under an argon atmosphere for more than 5 days, filter, wash and dry to obtain the precursor Mo 3 (BTC) 2 , and then placed the precursor in a quartz tube under an argon atmosphere for in-situ carbonization at 700-900°C for 5 hours, cooled to room temperature, washed with dimethyl fumarate, and dried to obtain molybdenum monocarbide nanoparticles and ultra-thin graphite ene-shell composi...

Embodiment 2

[0060] A composite of molybdenum carbide nanoparticles and ultrathin graphene shell (MoC@GS) anode material was synthesized by a two-step method. First prepare the precursor Mo 3 (BTC) 2 , and then the precursor product was in-situ carbonized in a quartz tube under an argon atmosphere to obtain the composite of molybdenum carbide nanoparticles and ultrathin graphene shells (MoC@GS), with a diameter of 1~ 10nm.

[0061] The specific operation is as follows:

[0062] Dissolve molybdenum hexacarbonyl and trimesic acid at a molar ratio of 1:10 in dimethyl fumarate, reflux reaction at 100°C under an argon atmosphere for more than 5 days, filter, wash and dry to obtain the precursor Mo 3 (BTC) 2 , and then place the precursor in a quartz tube under an argon atmosphere for in-situ carbonization at 500-1000°C for 2 hours, cool to room temperature, wash with dimethyl fumarate, and dry to obtain molybdenum monocarbide nanoparticles and ultra-thin graphite ene-shell composites (MoC...

Embodiment 3

[0064] A composite of molybdenum carbide nanoparticles and ultrathin graphene shell (MoC@GS) anode material was synthesized by a two-step method. First prepare the precursor Mo 3 (BTC) 2 , and then the precursor product was in-situ carbonized in a quartz tube under an argon atmosphere to obtain the composite of molybdenum carbide nanoparticles and ultrathin graphene shells (MoC@GS), with a diameter of 1~ 10nm.

[0065] The specific operation is as follows:

[0066] Dissolve molybdenum hexacarbonyl and trimesic acid at a molar ratio of 1:15 in dimethyl fumarate, reflux reaction at 200°C for more than 3 days under an argon atmosphere, filter, wash, and dry to obtain a precursor Mo 3 (BTC) 2 , and then placed the precursor in a quartz tube under an argon atmosphere for in-situ carbonization at 500-1000°C for 8 hours, cooled to room temperature, washed with dimethyl fumarate, and dried to obtain molybdenum monocarbide nanoparticles and ultra-thin graphite ene-shell composite...

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