Carbon/titanium dioxide coated tin oxide nano particle/carbon assembled mesoporous sphere material as well as preparation and application thereof

Abstract

The invention discloses a carbon / titanium dioxide coated tin oxide nano particle / carbon assembled mesoporous sphere material as well as preparation and application thereof in a lithium ion battery negative electrode material. In the material, SnO2 nano particles are assembled into mesoporous spheres through carbon, and the surfaces of the SnO2 mesoporous spheres are coated with a layer of TiO2 nano crystals and a layer of amorphous carbon. The preparation method comprises the following steps: firstly, synthesizing SnO2 nano particle / carbon assembled mesoporous spheres by a hydrothermal method,then coating TiO2 by a hydrolysis method, finally coating a layer of resorcinol-formaldehyde resin, and carbonizing to obtain a final product. According to the invention, the electrochemical activity, the structural stability and the cycling stability of SnO2 can be improved, so that SnO2 has high specific capacity and stable cycling performance. The carbon / TiO2 coated SnO2 nano particle / carbon assembled mesoporous sphere has an important application value as a lithium ion battery negative electrode material.

Description

technical field

[0001] The invention relates to the technical field of lithium-ion batteries, in particular to a carbon / titanium dioxide-coated tin oxide nanoparticle / carbon assembled mesoporous sphere material and its preparation and application. Background technique

[0002] Lithium-ion batteries have become the mainstream power source for electric vehicles and power tools due to their advantages such as high voltage, high specific energy, good safety, and long cycle life. At present, the negative electrode material of commercial lithium-ion batteries is mainly graphite, but the theoretical capacity of graphite is only 372mAh g -1 , cannot meet the demand for higher performance in the market. In addition, graphite has poor safety performance and low rate performance. Therefore, the development of negative electrode materials with higher energy density and better cycle stability is the focus of lithium-ion battery research.

[0003] SnO 2 High theoretical specific capacit...

Examples

Embodiment 1

[0034] (1) Add 5 mL of diethylenetriamine to 60 mL of deionized water, and stir for 10 minutes to form a uniform oil-water mixed solution; add 110 mg of sodium stannate trihydrate, 400 mg of thiourea, and 50 mg of D-glucose anhydrous to the above solution in sequence, Stir for 1h. Transfer the above solution to a 100mL hydrothermal reaction kettle, seal it, heat it to 200°C for hydrothermal reaction for 24 hours, cool to room temperature, centrifuge the product, wash it with deionized water and absolute ethanol three times, and dry it at 60°C to obtain SnO 2 Nanoparticle / carbon assembled mesoporous spheres;

[0035] (2) 25mg SnO obtained in step (1) 2 Disperse nanoparticles / carbon-assembled mesoporous spheres in 50 mL of absolute ethanol, sonicate for 30 minutes, add 0.2 mL of isopropyl titanate, stir for 15 minutes, heat up to 60 ° C, slowly add 2 mL of deionized water, continue stirring for 90 minutes, and centrifuge to separate the product , washed three times with absol...

Embodiment 2

[0043] (1) Add 5 mL of diethylenetriamine to 60 mL of deionized water, and stir for 10 minutes to form a uniform oil-water mixed solution; add 110 mg of sodium stannate trihydrate, 400 mg of thiourea, and 50 mg of D-glucose anhydrous to the above solution in sequence, Stir for 1h. Transfer the above solution to a 100ml hydrothermal reaction kettle, seal it, heat it to 200°C for hydrothermal reaction for 24 hours, cool to room temperature, centrifuge the product, wash it with deionized water and absolute ethanol three times, and dry it at 60°C to obtain SnO 2 Nanoparticle / carbon assembled mesoporous spheres;

[0044] (2) 25mg SnO obtained in step (1) 2 Disperse nanoparticles / carbon-assembled mesoporous spheres in 50 mL of absolute ethanol, sonicate for 30 minutes, add 0.3 mL of isopropyl titanate, stir for 15 minutes, raise the temperature to 60 ° C, slowly add 3 mL of deionized water, continue stirring for 90 minutes, and centrifuge to separate the product. Wash 3 times wit...

Embodiment 3

[0049] (1) Add 5 mL of diethylenetriamine to 60 mL of deionized water, and stir for 10 minutes to form a uniform oil-water mixed solution; add 110 mg of sodium stannate trihydrate, 400 mg of thiourea, and 50 mg of D-glucose anhydrous to the above solution in sequence, Stir for 1h. Transfer the above solution to a 100ml hydrothermal reaction kettle, seal it, heat it to 200°C for hydrothermal reaction for 24 hours, cool to room temperature, centrifuge the product, wash it with deionized water and absolute ethanol three times, and dry it at 60°C to obtain SnO 2 Nanoparticle / carbon assembled mesoporous spheres;

[0050] (2) 25mg SnO obtained in step (1) 2 Disperse nanoparticles / carbon-assembled mesoporous spheres in 50mL absolute ethanol, ultrasonicate for 30min, add 0.2mL isopropyl titanate, stir for 15min, heat up to 60°C, slowly add 2mL deionized water, continue stirring for 90min, and centrifuge to separate the product. Wash 3 times with absolute ethanol and dry at 60°C to ...

technical field

[0001] The invention relates to the technical field of lithium-ion batteries, in particular to a carbon / titanium dioxide-coated tin oxide nanoparticle / carbon assembled mesoporous sphere material and its preparation and application. Background technique

[0002] Lithium-ion batteries have become the mainstream power source for electric vehicles and power tools due to their advantages such as high voltage, high specific energy, good safety, and long cycle life. At present, the negative electrode material of commercial lithium-ion batteries is mainly graphite, but the theoretical capacity of graphite is only 372mAh g -1 , cannot meet the demand for higher performance in the market. In addition, graphite has poor safety performance and low rate performance. Therefore, the development of negative electrode materials with higher energy density and better cycle stability is the focus of lithium-ion battery research.

[0003] SnO 2 High theoretical specific capacit...

Examples

Embodiment 1

[0034] (1) Add 5 mL of diethylenetriamine to 60 mL of deionized water, and stir for 10 minutes to form a uniform oil-water mixed solution; add 110 mg of sodium stannate trihydrate, 400 mg of thiourea, and 50 mg of D-glucose anhydrous to the above solution in sequence, Stir for 1h. Transfer the above solution to a 100mL hydrothermal reaction kettle, seal it, heat it to 200°C for hydrothermal reaction for 24 hours, cool to room temperature, centrifuge the product, wash it with deionized water and absolute ethanol three times, and dry it at 60°C to obtain SnO 2 Nanoparticle / carbon assembled mesoporous spheres;

[0035] (2) 25mg SnO obtained in step (1) 2 Disperse nanoparticles / carbon-assembled mesoporous spheres in 50 mL of absolute ethanol, sonicate for 30 minutes, add 0.2 mL of isopropyl titanate, stir for 15 minutes, heat up to 60 ° C, slowly add 2 mL of deionized water, continue stirring for 90 minutes, and centrifuge to separate the product , washed three times with absol...

Embodiment 2

[0043] (1) Add 5 mL of diethylenetriamine to 60 mL of deionized water, and stir for 10 minutes to form a uniform oil-water mixed solution; add 110 mg of sodium stannate trihydrate, 400 mg of thiourea, and 50 mg of D-glucose anhydrous to the above solution in sequence, Stir for 1h. Transfer the above solution to a 100ml hydrothermal reaction kettle, seal it, heat it to 200°C for hydrothermal reaction for 24 hours, cool to room temperature, centrifuge the product, wash it with deionized water and absolute ethanol three times, and dry it at 60°C to obtain SnO 2 Nanoparticle / carbon assembled mesoporous spheres;

[0044] (2) 25mg SnO obtained in step (1) 2 Disperse nanoparticles / carbon-assembled mesoporous spheres in 50 mL of absolute ethanol, sonicate for 30 minutes, add 0.3 mL of isopropyl titanate, stir for 15 minutes, raise the temperature to 60 ° C, slowly add 3 mL of deionized water, continue stirring for 90 minutes, and centrifuge to separate the product. Wash 3 times wit...

Embodiment 3

[0049] (1) Add 5 mL of diethylenetriamine to 60 mL of deionized water, and stir for 10 minutes to form a uniform oil-water mixed solution; add 110 mg of sodium stannate trihydrate, 400 mg of thiourea, and 50 mg of D-glucose anhydrous to the above solution in sequence, Stir for 1h. Transfer the above solution to a 100ml hydrothermal reaction kettle, seal it, heat it to 200°C for hydrothermal reaction for 24 hours, cool to room temperature, centrifuge the product, wash it with deionized water and absolute ethanol three times, and dry it at 60°C to obtain SnO 2 Nanoparticle / carbon assembled mesoporous spheres;

[0050] (2) 25mg SnO obtained in step (1) 2 Disperse nanoparticles / carbon-assembled mesoporous spheres in 50mL absolute ethanol, ultrasonicate for 30min, add 0.2mL isopropyl titanate, stir for 15min, heat up to 60°C, slowly add 2mL deionized water, continue stirring for 90min, and centrifuge to separate the product. Wash 3 times with absolute ethanol and dry at 60°C to ...

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