CN112357956A - Carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material and preparation and application thereof - Google Patents

Carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material and preparation and application thereof Download PDF

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CN112357956A
CN112357956A CN202011040033.0A CN202011040033A CN112357956A CN 112357956 A CN112357956 A CN 112357956A CN 202011040033 A CN202011040033 A CN 202011040033A CN 112357956 A CN112357956 A CN 112357956A
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carbon
sno
tio
tin oxide
mesoporous
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CN112357956B (en
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袁永锋
赵文才
朱敏
尹思敏
郭绍义
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Zhejiang University of Technology ZJUT
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Abstract

The invention discloses a carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material, a preparation method thereof and application thereof in a lithium ion battery cathode material. Of said materials, SnO2The nano particles are assembled into mesoporous spheres through carbon, and are placed in SnO2The surface of the mesoporous sphere is coated with a layer of TiO2A nanocrystal and a layer of amorphous carbon. The preparation method comprises the following steps: first, SnO is synthesized by a hydrothermal method2Assembling nano particles/carbon into mesoporous spheres, and coating TiO by hydrolysis method2Finally, coating a layer of resorcinol-formaldehyde resin, and carbonizing to obtain the final product. The invention can improve SnO2Electrochemical activity, structural stability and cycling stability of the compound, so that SnO2Has high specific capacity and stable cycle performance. carbon/TiO 22Coated SnO2The nano-particle/carbon assembled mesoporous spheres have important application value as the negative electrode material of the lithium ion battery.

Description

Carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material and preparation and application thereof
Technical Field
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 preparation and application thereof.
Background
Lithium ion batteries have become the main flow power source for electric vehicles and electric tools due to their advantages of high voltage, high specific energy, good safety, long cycle life, and the like. At present, the negative electrode material of the commercial lithium ion battery is mainly graphite, but the theoretical capacity of the graphite is only 372mAh g-1In addition, the safety performance of graphite is poor, and the rate capability is low, so that the development of a negative electrode material with higher energy density and better cycle stability is the key point of the research of lithium ion batteries.
SnO2High theoretical specific capacity (782mAh g)-1) The lithium has low insertion potential and low price, and is one of ideal negative electrode materials of the next generation lithium ion battery for replacing graphite. SnO2The method has the main problems that huge volume change is generated in the charging and discharging process, the volume change exceeds 300 percent, the specific capacity is rapidly attenuated, and the practical application of the method in the lithium ion battery is hindered.
Nano-sized and compounded with conductive material for improving SnO2Circulation ofAn effective method of stability. The patent specification with the publication number of CN110649258A discloses a three-dimensional porous tin oxide graphene composite electrode material, the patent specification with the publication number of CN108793233A discloses a multilayer hollow tin oxide material, and the report on how much sound is SnO2The composite negative electrode material of the/rGO lithium ion battery (He Tai, Koluol, Zhongsi Yi, Like, Wanglili, Tianjin university of Industrial science 39(3), (2020), 29-33). However, the conventional nano-design has difficulty in solving the problem of nano-material agglomeration, resulting in a significant reduction in nano-effect. SnO is not well suppressed by general composite structures2Volume change of (2), not to significantly increase SnO2The cycle stability of (c). Thus, there is provided a method for suppressing SnO effectively with a high specific capacity2Composite structure pair SnO with good volume expansion and cycle performance in charge and discharge process2The development of base materials is of great significance.
Disclosure of Invention
In view of the above-mentioned problems and deficiencies in the art, the present invention provides a carbon/titanium dioxide (TiO)2) Coated tin oxide (SnO)2) The nano-particle/carbon assembled mesoporous sphere material.
A carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material is prepared from SnO2The nano particles are assembled by carbon adhesion, and the surfaces of the nano particles are sequentially coated with TiO2A layer and a carbon layer; the TiO is2The layer being made of TiO2Composition of nano-crystals; the carbon layer is amorphous carbon formed by carbonizing resorcinol-formaldehyde resin (RF resin).
The nanocrystals refer to crystalline nanoparticles. The TiO is2The surface of the tin oxide nanoparticle/carbon assembled mesoporous sphere is coated with the nanocrystal.
Preferably, the tin oxide nanoparticle/carbon assembly mesoporous sphere contains micropores and mesopores inside;
the diameter of the tin oxide nano-particles/carbon assembled mesoporous spheres is 30-200nm, and the SnO2The particle size of the nano particles is 5-20 nm;
the content of carbon in the tin oxide nano-particles/carbon assembled mesoporous spheres is 1-20 wt%.
Further preferably, the TiO is2The grain diameter of the nano crystal is 5-15nm, and the TiO is2The thickness of the layer is 10-100 nm.
Even more preferably, the carbon layer is coated on the TiO2The thickness of the layer surface is 5-50 nm.
The invention also provides a preparation method of the carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material, which comprises the following steps:
(1) adding 5mL of diethylenetriamine into 60mL of deionized water, and stirring for 10min to form a uniform oil-water mixed solution; sequentially adding 110mg of sodium stannate trihydrate, 400mg of thiourea and 50mg of D-anhydrous glucose into the oil-water mixed solution, stirring for 1h, transferring into a 100mL hydrothermal reaction kettle, sealing, heating to 180 ℃ and 220 ℃ for hydrothermal reaction for 1-48h, cooling to room temperature, centrifugally separating the product, washing with deionized water and absolute ethyl alcohol for 3 times, and drying at 60 ℃ to obtain SnO2Nanoparticle/carbon assembly mesoporous spheres;
(2) 25mg of SnO obtained in step (1)2Dispersing the nano-particle/carbon assembled mesoporous spheres in 50mL of absolute ethyl alcohol, performing ultrasonic treatment for 30min, adding 0.1-0.5mL of isopropyl titanate, stirring for 15min, heating to 50-80 ℃, adding 1-5mL of deionized water, continuing stirring for 90min, performing centrifugal separation on a product, washing for 3 times by using absolute ethyl alcohol, and drying at 60 ℃ to obtain TiO2Coated SnO2Nanoparticle/carbon assembly mesoporous spheres.
(3) 40mg of TiO obtained in the step (2)2Coated SnO2Dispersing the nano-particle/carbon assembled mesoporous spheres in a mixed solution of 30mL of deionized water and 12.5mL of absolute ethyl alcohol, adding 75mg of hexadecyl trimethyl ammonium bromide, stirring for 1h, heating to 30-40 ℃, adding 5-30mg of resorcinol, stirring for 10min, sequentially adding 0.05-0.4mL of ammonia water and 5-45 μ L of formaldehyde, stirring for reaction for 16h, centrifugally separating the product, washing for 3 times with absolute ethyl alcohol, drying at 60 ℃, placing in a quartz tube furnace, heating to 500 ℃ in an argon environment, preserving heat for 0.5-5h, and cooling to room temperature to obtain the carbon/TiO2Coated SnO2The nano-particle/carbon assembled mesoporous sphere material.
The preparation method of the invention: first, SnO is synthesized by a hydrothermal method2Assembling nano particles/carbon into mesoporous spheres, and coating TiO by hydrolysis method2Finally, coating a layer of resorcinol-formaldehyde resin, and carbonizing to obtain the final product.
The invention also provides application of the carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material in a lithium ion battery cathode material.
In a preferred embodiment, the carbon/TiO of the present invention is used2Coated SnO2Preparing a lithium ion battery cathode by using the nanoparticle/carbon assembled mesoporous sphere material: respectively weighing the synthetic material, the acetylene black conductive agent and the polyvinylidene fluoride (PVDF) binder in a mass ratio of 8:1:1, dissolving the PVDF in a proper amount of 1-methyl-2-pyrrolidone (NMP), stirring until the PVDF is completely dissolved, adding the uniformly ground synthetic material and the acetylene black into the solution, and continuously stirring to ensure that the slurry is uniformly mixed. And then uniformly coating the slurry on a wafer copper foil (with the diameter of 12mm), drying in a vacuum oven at 100 ℃, and finally flattening by using a pressure intensity of 10MPa on a tablet press to obtain the electrode plate.
And assembling the prepared electrode plate, a lithium plate and a diaphragm into the CR2025 button-type lithium ion battery in a glove box filled with high-purity argon. The electrolyte is 1mol L-1LiPF6The EC/DMC electrolyte adopts a new power battery test system to test the charge-discharge performance and the cycling stability of the lithium ion battery.
The invention can improve SnO2Electrochemical activity, structural stability and cycling stability of the compound, so that SnO2Has high specific capacity and stable cycle performance.
Compared with the prior art, the invention has the main advantages that:
(1)SnO2the nano particles have small size, large specific surface area and high electrochemical activity; assembly of SnO by carbon2The nano particles form mesoporous spheres, so that the problem of agglomeration of nano materials is avoided, the full play of a nano effect is ensured, the mesoporous structure is favorable for the permeation and storage of electrolyte and the volume change of a containing material, and in addition, the carbon improves SnO2Electrical conductivity, these favorable factors being SnO2With a high ratioCapacity and high rate capability.
(2)TiO2The coating layer composed of the nanocrystalline has high structural strength and can effectively inhibit SnO2The volume expansion and contraction in the charging and discharging process is to improve SnO2The main factors of the structural stability and the cycling stability of the nanoparticle/carbon assembled mesoporous spheres. Furthermore, TiO2The nano-crystalline structure endows the composite material with higher electrochemical activity, can also provide charge and discharge capacity, and ensures higher specific capacity of the whole composite material.
(3) The coated carbon formed by carbonizing the RF resin enables the contact among the composite material particles to be high-conductivity carbon contact, improves the conductivity of the composite material, ensures the excellent high-rate performance of the material, and can inhibit SnO (SnO) by the coated carbon2The volume expansion and contraction in the charging and discharging process can further improve the structural stability and the cycling stability of the composite material. The amorphous carbon can also participate in lithium storage reaction, the amorphous structure endows the amorphous carbon with higher electrochemical activity, and the amorphous carbon can also provide charge and discharge capacity, so that the integral higher specific capacity of the composite material is ensured.
Drawings
FIG. 1 is SnO prepared in example 12SEM photograph of nanoparticle/carbon assembled mesoporous spheres;
FIG. 2 is SnO prepared in example 12TEM photograph of nanoparticle/carbon assembled mesoporous spheres;
FIG. 3 shows the carbon/TiO prepared in example 12Coated SnO2SEM photograph of nanoparticle/carbon assembled mesoporous spheres;
FIG. 4 shows the carbon/TiO prepared in example 12Coated SnO2TEM photograph of nanoparticle/carbon assembled mesoporous spheres;
FIG. 5 shows the carbon/TiO prepared in example 12Coated SnO2Nanoparticle/carbon assembly mesoporous spheres at a current density of 1000mAg-1A cycle performance map of (a);
FIG. 6 shows the carbon/TiO prepared in example 12Coated SnO2And (3) a rate performance graph of the nanoparticle/carbon assembled mesoporous spheres.
Detailed Description
The invention is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
Example 1
(1) Adding 5mL of diethylenetriamine into 60mL of deionized water, and stirring for 10min to form a uniform oil-water mixed solution; 110mg of sodium stannate trihydrate, 400mg of thiourea and 50mg of D-anhydrous glucose are added to the solution in sequence and stirred for 1 hour. Transferring the solution into a 100mL hydrothermal reaction kettle, sealing, heating to 200 ℃ for hydrothermal reaction for 24h, cooling to room temperature, centrifugally separating the product, washing with deionized water and absolute ethyl alcohol for 3 times respectively, and drying at 60 ℃ to obtain SnO2Nanoparticle/carbon assembly mesoporous spheres;
(2) 25mg of SnO obtained in step (1)2Dispersing the nano-particle/carbon assembled mesoporous spheres in 50mL of absolute ethyl alcohol, performing ultrasonic treatment for 30min, adding 0.2mL of isopropyl titanate, stirring for 15min, heating to 60 ℃, slowly adding 2mL of deionized water, continuously stirring for 90min, performing centrifugal separation on a product, washing for 3 times by using absolute ethyl alcohol, and drying at 60 ℃ to obtain TiO2Coated SnO2Nanoparticle/carbon assembly mesoporous spheres.
(3) 40mg of TiO obtained in the step (2)2Coated SnO2Dispersing the nano-particle/carbon assembled mesoporous spheres in a mixed solution of 30mL of deionized water and 12.5mL of absolute ethyl alcohol, adding 75mg of hexadecyl trimethyl ammonium bromide, stirring for 1h, heating to 35 ℃, adding 16mg of resorcinol, stirring for 10min, sequentially adding 0.2mL of ammonia water and 22.6 mu L of formaldehyde, stirring for reacting for 16h, centrifugally separating a product, washing for 3 times by using absolute ethyl alcohol, and drying at 60 ℃. Placing the obtained product in a quartz tube furnace, heating to 600 ℃ in an argon environment, preserving heat for 2h, and cooling to room temperature to obtain carbon/TiO2Coated SnO2Nanoparticle/carbon assembly mesoporous spheres.
FIG. 1 shows SnO synthesized in step (1)2SEM photograph of the nanoparticle/carbon assembled mesoporous spheres, it can be seen that the product is uniform nanospheres, about 70-90 diameterAnd (5) nm. The nanospheres are independent of each other and do not agglomerate. Fig. 2 is a TEM photograph thereof, and it can be seen that the nanospheres are formed by assembling some nanoparticles, which are about 15nm long and about 7nm wide. A large number of micropores/mesopores are formed among the nano particles and inside the nanospheres, so that the nanospheres have large specific surface areas. The nanospheres were found to contain 2 wt% carbon by energy spectroscopy. The carbon is distributed among the nano particles and is SnO2The main reason for the assembly of nanoparticles into mesoporous spheres. FIG. 3 shows the carbon/TiO synthesized in step (3)2Coated SnO2SEM photo of the nano-particle/carbon assembled mesoporous sphere, the surface of the nanosphere becomes smooth, and the nanosphere is obviously coated with a new material. Fig. 4 is a TEM photograph thereof, and it can be seen that two nanospheres of the same size are close to the center, with a diameter of about 90 nm. Outside the nanospheres are small particles of TiO2Nanocrystalline, TiO2The thickness of the cladding layer is about 50 nm. In TiO2The outer surface of the cladding layer is amorphous carbon and the thickness of the cladding layer is about 20 nm.
Using the carbon/TiO of this example2Coated SnO2Preparing a lithium ion battery cathode by using the nanoparticle/carbon assembled mesoporous sphere material: respectively weighing the synthetic material, the acetylene black conductive agent and the polyvinylidene fluoride (PVDF) binder in a mass ratio of 8:1:1, dissolving the PVDF in a proper amount of 1-methyl-2-pyrrolidone (NMP), stirring until the PVDF is completely dissolved, adding the uniformly ground synthetic material and the acetylene black into the solution, and continuously stirring to ensure that the slurry is uniformly mixed. And then uniformly coating the slurry on a wafer copper foil (with the diameter of 12mm), drying in a vacuum oven at 100 ℃, and finally flattening by using a pressure intensity of 10MPa on a tablet press to obtain the electrode plate.
And assembling the prepared electrode plate, a lithium plate and a diaphragm into the CR2025 button-type lithium ion battery in a glove box filled with high-purity argon. The electrolyte is 1mol L-1LiPF6The EC/DMC electrolyte adopts a novacar battery test system to test the charge-discharge performance and the cycle stability of the lithium ion battery, and the charge-discharge current density is 1000mA g-1The voltage range is 0.01-3.0V.
FIG. 5 is a carbon/TiO drawing2Coated SnO2The nano-particle/carbon assembled mesoporous sphere material has the current density of 1000mA g-1Cycle performance map of (c).The specific discharge capacity at 1 st cycle was 1409mAh g-1The discharge capacity then dropped and stabilized to 1000mAh g-1The specific discharge capacity is reduced to 995mAh g by the 100 th cycle-1. The average specific discharge capacity of 100 cycles was 1002mAh g-1. carbon/TiO 22Coated SnO2The specific discharge capacity and cycling stability of the nanoparticle/carbon assembled mesoporous spheres are superior to those of the patent technologies with publication numbers CN111640925A and CN111549321A, and the work of zhijing Hu et al (z.q.hu, x.f.xu, x.f.wang, k.f.yu, c.liang, Journal of Alloys and Compounds835(2020) 155446).
FIG. 6 is a carbon/TiO plot2Coated SnO2And (3) a rate performance graph of the nanoparticle/carbon assembled mesoporous sphere material. At 200, 500, 1000, 1500 and 2000mA g-1The average specific discharge capacity of the composite material is 1138, 1070, 984, 925 and 805mAh g at the current density of (A)-1And exhibits excellent rate capability. When the current density returns to 200mA g-1The discharge specific capacity is recovered to 1108mAh g-1The recovery rate reaches 97.4 percent, which shows that the carbon/TiO2Coated SnO2The nanoparticle/carbon assembled mesoporous sphere material has good structural stability and cycling stability, and can perform a large-current reaction.
Example 2
(1) Adding 5mL of diethylenetriamine into 60mL of deionized water, and stirring for 10min to form a uniform oil-water mixed solution; 110mg of sodium stannate trihydrate, 400mg of thiourea and 50mg of D-anhydrous glucose are added to the solution in sequence and stirred for 1 hour. Transferring the solution into a 100ml hydrothermal reaction kettle, sealing, heating to 200 ℃ for hydrothermal reaction for 24h, cooling to room temperature, centrifugally separating the product, washing 3 times with deionized water and absolute ethyl alcohol respectively, and drying at 60 ℃ to obtain SnO2Nanoparticle/carbon assembly mesoporous spheres;
(2) 25mg of SnO obtained in step (1)2Dispersing the nano-particle/carbon assembled mesoporous spheres in 50mL of absolute ethyl alcohol, performing ultrasonic treatment for 30min, adding 0.3mL of isopropyl titanate, stirring for 15min, heating to 60 ℃, slowly adding 3mL of deionized water, continuously stirring for 90min, performing centrifugal separation on the product, washing for 3 times by using absolute ethyl alcohol, and drying at 60 ℃ to obtain TiO2Coated SnO2Nanoparticle/carbon assembly mesoporous spheres.
The subsequent process was the same as in example 1.
Product carbon/TiO2Coated SnO2The microstructure of the nanoparticle/carbon assembly mesoporous spheres is the same as that of example 1, with the main difference being that TiO2Becomes 72 nm.
The same process as in example 1 was used to fabricate a negative electrode of a lithium ion battery, which was assembled into a lithium ion battery at a current density of 1000mA g-1And carrying out cyclic charge and discharge test within the voltage range of 0.01-3.0V. The specific discharge capacity of the 1 st cycle was 1242mAh g-1Then the specific discharge capacity is reduced and stabilized to 830mAh g-1The specific discharge capacity is reduced to 825mAh g by the 100 th cycle-1. The average specific discharge capacity over 100 cycles was 836mAh g-1。
Example 3
(1) Adding 5mL of diethylenetriamine into 60mL of deionized water, and stirring for 10min to form a uniform oil-water mixed solution; 110mg of sodium stannate trihydrate, 400mg of thiourea and 50mg of D-anhydrous glucose are added to the solution in sequence and stirred for 1 hour. Transferring the solution into a 100ml hydrothermal reaction kettle, sealing, heating to 200 ℃ for hydrothermal reaction for 24h, cooling to room temperature, centrifugally separating the product, washing 3 times with deionized water and absolute ethyl alcohol respectively, and drying at 60 ℃ to obtain SnO2Nanoparticle/carbon assembly mesoporous spheres;
(2) 25mg of SnO obtained in step (1)2Dispersing the nano-particle/carbon assembled mesoporous spheres in 50mL of absolute ethyl alcohol, performing ultrasonic treatment for 30min, adding 0.2mL of isopropyl titanate, stirring for 15min, heating to 60 ℃, slowly adding 2mL of deionized water, continuously stirring for 90min, performing centrifugal separation on the product, washing for 3 times by using absolute ethyl alcohol, and drying at 60 ℃ to obtain TiO2Coated SnO2Nanoparticle/carbon assembly mesoporous spheres.
(3) 40mg of TiO obtained in the step (2)2Coated SnO2Dispersing the nano-particle/carbon assembled mesoporous spheres in a mixed solution of 30mL of deionized water and 12.5mL of absolute ethyl alcohol, adding 75mg of hexadecyl trimethyl ammonium bromide, stirring for 1h, heating to 35 ℃, adding 24mg of resorcinol, stirring for 10min, and then sequentially adding 0.3Stirring and reacting for 16h by using mL ammonia water and 33.9 mu L formaldehyde, centrifugally separating a product, washing for 3 times by using absolute ethyl alcohol, and drying at 60 ℃. Placing the obtained product in a quartz tube furnace, heating to 600 ℃ in an argon environment, preserving heat for 2h, and cooling to room temperature to obtain carbon/TiO2Coated SnO2Nanoparticle/carbon assembly mesoporous spheres.
Product carbon/TiO2Coated SnO2The microstructure of the nanoparticle/carbon assembly mesoporous spheres was the same as in example 1, with the main difference that the carbon coating thickness was changed to 27 nm.
The same process as in example 1 was used to fabricate a negative electrode of a lithium ion battery, which was assembled into a lithium ion battery at a current density of 1000mA g-1And carrying out cyclic charge and discharge test within the voltage range of 0.01-3.0V. The 1 st specific cyclic discharge capacity is 1322mAh g-1Then the specific discharge capacity is reduced and stabilized to 940mAh g-1The specific discharge capacity is reduced to 934mAh g by the 100 th cycle-1. The average specific discharge capacity of 100 cycles was 944mAh g-1。
Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention as defined by the appended claims.

Claims (6)

1. The carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material is characterized in that the tin oxide nanoparticle/carbon assembled mesoporous sphere is made of SnO2The nano particles are assembled by carbon adhesion, and the surfaces of the nano particles are sequentially coated with TiO2A layer and a carbon layer; the TiO is2The layer being made of TiO2Composition of nano-crystals; the carbon layer is amorphous carbon formed by carbonizing resorcinol-formaldehyde resin.
2. The carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material according to claim 1, wherein the tin oxide nanoparticle/carbon assembled mesoporous sphere contains micropores and mesopores inside;
the tin oxide nanoparticle/carbon assembly mesoporous sphereHas a diameter of 30-200nm, and the SnO2The particle size of the nano particles is 5-20 nm;
the content of carbon in the tin oxide nano-particles/carbon assembled mesoporous spheres is 1-20 wt%.
3. The carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material of claim 2, wherein the TiO is selected from the group consisting of2The grain diameter of the nano crystal is 5-15nm, and the TiO is2The thickness of the layer is 10-100 nm.
4. The carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembled mesoporous sphere material of claim 3, wherein the carbon layer is coated on TiO2The thickness of the layer surface is 5-50 nm.
5. The method for preparing carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembly mesoporous sphere material according to any one of claims 1 to 4, comprising the steps of:
(1) adding 5mL of diethylenetriamine into 60mL of deionized water, and stirring for 10min to form a uniform oil-water mixed solution; sequentially adding 110mg of sodium stannate trihydrate, 400mg of thiourea and 50mg of D-anhydrous glucose into the oil-water mixed solution, stirring for 1h, transferring into a 100mL hydrothermal reaction kettle, sealing, heating to 180 ℃ and 220 ℃ for hydrothermal reaction for 1-48h, cooling to room temperature, centrifugally separating the product, washing with deionized water and absolute ethyl alcohol for 3 times, and drying at 60 ℃ to obtain SnO2Nanoparticle/carbon assembly mesoporous spheres;
(2) 25mg of SnO obtained in step (1)2Dispersing the nano-particle/carbon assembled mesoporous spheres in 50mL of absolute ethyl alcohol, performing ultrasonic treatment for 30min, adding 0.1-0.5mL of isopropyl titanate, stirring for 15min, heating to 50-80 ℃, adding 1-5mL of deionized water, continuing stirring for 90min, performing centrifugal separation on a product, washing for 3 times by using absolute ethyl alcohol, and drying at 60 ℃ to obtain TiO2Coated SnO2Nanoparticle/carbon assembly mesoporous spheres;
(3) 40mg of TiO obtained in the step (2)2Coated SnO2The nano particles/carbon assembled mesoporous spheres are dispersed inAdding 75mg of hexadecyl trimethyl ammonium bromide into a mixed solution of 30mL of deionized water and 12.5mL of absolute ethyl alcohol, stirring for 1h, heating to 30-40 ℃, adding 5-30mg of resorcinol, stirring for 10min, sequentially adding 0.05-0.4mL of ammonia water and 5-45 mu L of formaldehyde, stirring for reaction for 16h, centrifugally separating a product, washing for 3 times by using absolute ethyl alcohol, drying at 60 ℃, placing in a quartz tube furnace, heating to 700 ℃ in an argon environment, preserving heat for 0.5-5h, and cooling to room temperature to obtain the carbon/TiO2Coated SnO2The nano-particle/carbon assembled mesoporous sphere material.
6. The use of the carbon/titanium dioxide coated tin oxide nanoparticle/carbon assembly mesoporous sphere material according to any one of claims 1 to 4 in a negative electrode material of a lithium ion battery.
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