CN109686578B - Synthetic method and application of ordered mesoporous silica-cobalt oxide-based @ graphene composite material - Google Patents
Synthetic method and application of ordered mesoporous silica-cobalt oxide-based @ graphene composite material Download PDFInfo
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Abstract
The invention provides a method for synthesizing an ordered mesoporous silica-cobalt oxide-based @ graphene composite material, which comprises the steps of taking graphene oxide, silicon-containing organic matters and cobalt phthalocyanine as main raw materials, stirring, heating in a stainless steel reaction kettle, preserving heat, carrying out suction filtration, washing, drying and high-temperature calcination on a product obtained by reaction, carrying out ball milling on the product and the cobalt phthalocyanine, mixing, heating and preserving heat to obtain the ordered mesoporous silica-cobalt oxide-based @ graphene composite material. The invention also discloses the ordered mesoporous silica-cobalt oxide-based @ graphene composite material used as a negative electrode material of a lithium ion capacitor. The synthesis method is simple and easy to implement, and the prepared ordered mesoporous silicon oxide-cobalt oxide base @ graphene composite material is good in conductivity, and can solve the problem that the silicon oxide-cobalt oxide base material and graphene are easy to separate due to different volume expansion coefficients; the lithium ion mixed capacitor cathode material can be used as a cathode material of a lithium ion mixed capacitor, and can remarkably improve the cycle stability and the charge and discharge performance of the capacitor.
Description
Technical Field
The invention relates to the technical field of lithium ion capacitors, in particular to a synthetic method and application of an ordered mesoporous silicon oxide-cobalt oxide-based @ graphene composite material.
Background
With the continuous development of world economy, fossil energy is gradually exhausted, environmental pollution is continuously aggravated, and the global greenhouse effect is increasingly remarkable, so that the development of novel technologies such as new energy development, environmental protection, energy conservation and emission reduction and the like becomes an extremely important and urgent subject for human beings. While chemical energy storage devices are an important component of energy systems, lithium ion hybrid capacitors are attracting much attention due to their excellent performance. The lithium ion hybrid capacitor has the characteristics of both a battery and a super capacitor, and has the advantages of higher energy density than that of a conventional super capacitor and higher power density than that of a lithium ion battery. Therefore, the design of lithium ion hybrid capacitor systems has led to extensive research and development and is now widely used in many fields.
The electrode material is the core of the lithium ion hybrid capacitor, and is the key for improving the capacity and the coulombic efficiency of the lithium ion capacitor and improving the cycle performance. The electrode material of the lithium ion hybrid capacitor mainly comprises a positive electrode material and a negative electrode material, wherein the negative electrode material also has great influence on the performance of the lithium ion hybrid capacitor.
The graphene is a novel two-dimensional carbon nanomaterial, has the advantages of large specific surface area, high electron transmission capability, good electrical and thermal conductivity, good flexibility and the like, and can be applied to electrode materials of lithium ion hybrid capacitors. However, graphene has a low specific capacitance, poor cycling stability and is easy to agglomerate, and cannot replace the current commercial carbon material to be directly used as a negative electrode material of a lithium ion hybrid capacitor.
Silicon as a novel lithium ion hybrid capacitor cathode material has ultrahigh theoretical specific capacity (4200mAh/g) and lower delithiation potential (less than 0.5V), and the voltage platform of silicon is slightly higher than that of graphite, so that surface lithium precipitation is difficult to cause during charging, and the safety performance is better. Silicon becomes one of the most promising candidates for the upgrade of carbon-based cathodes for lithium ion batteries. But silicon is a semiconductor material and has low conductivity by itself. Researches show that the silicon surface is coated with the carbon material, so that the agglomeration of silicon particles can be prevented, and the expansion of silicon volume in the charging and discharging process can be effectively inhibited, thereby greatly improving the cycle stability of the lithium ion hybrid capacitor. However, the graphene-coated silicon-based negative electrode material is easy to crack and separate due to different volume expansion coefficients of silicon and graphene.
In the research of the negative electrode material of the lithium ion hybrid capacitor, at present, the specific capacitance of graphene is improved by adopting the graphene loaded metal oxide. However, many metal oxides have the problem of volume expansion, which causes that the specific capacity of the metal oxides is seriously attenuated in the circulation process, and the performance of the composite material is not ideal enough.
Based on this, there is a need for a composite material in which a metal oxide and silicon oxide are simultaneously supported on graphene, and the composite material has good electrical properties and can overcome the problem of separation due to volume expansion.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for synthesizing an ordered mesoporous silica-cobalt oxide-based @ graphene composite material, wherein a certain gap is reserved between the silica-cobalt oxide-based material and graphene, the phenomenon that the silica-cobalt oxide-based material and the graphene are easy to separate due to different volume expansion coefficients is solved by forming an ordered mesoporous structure, and the conductivity of the silica-cobalt oxide-based @ graphene composite material can be greatly improved because the silica-cobalt oxide-based material is simultaneously doped in the graphene.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for synthesizing an ordered mesoporous silica-cobalt oxide based @ graphene composite material is characterized by comprising the following steps of:
step a), mixing graphene oxide with deionized water, and performing ultrasonic treatment to obtain a graphene oxide dispersion liquid;
step b), adding a mixture of a surfactant and a hydrochloric acid solution into the graphene oxide dispersion liquid obtained in the step a), stirring, then adding a silicon-containing organic matter, and continuing stirring to obtain a mixture;
step c), placing the mixture obtained in the step b) in a stainless steel reaction kettle, heating and preserving heat, then naturally cooling to room temperature, carrying out suction filtration on the obtained reaction mixed solution, washing the obtained precipitate with ethanol, adding a mixed solution of ethanol and concentrated hydrochloric acid, stirring, carrying out suction filtration on the obtained mixed solution, washing the obtained precipitate with ethanol, and carrying out vacuum drying on the obtained substance;
step d) calcining the final product obtained in step c) in air, and then performing H2Preserving heat in an/Ar atmosphere, and naturally cooling to room temperature to obtain a silicon oxide @ graphene material;
step e) ball-milling and mixing the silicon oxide @ graphene material obtained in the step d) with cobalt phthalocyanine, and performing ball milling on the mixture in N2Or heating to 550 ℃ under Ar atmosphere, preserving heat for 1-3 h, heating to 700 ℃, preserving heat for 4-8 h, and finally obtaining the ordered mesoporous silica-cobalt oxide-based @ graphene composite material.
In the above technical solution, in the step b), the surfactant is a triblock copolymer of polyethylene oxide-polypropylene oxide-polyethylene oxide.
In the above technical scheme, in the step b), the silicon-containing organic substance is one of tetrapropyl orthosilicate, tetraethyl orthosilicate, tetraethoxysilane and tetrapropoxysilane.
In the above technical scheme, in the step b), the mass ratio of the graphene oxide dispersion liquid, the surfactant and the silicon-containing organic matter is 1: (4-8): (10-20).
In the technical scheme, in the step c), the heating temperature is 60-180 ℃, and the heat preservation time is 12-36 hours.
In the technical scheme, in the step d), the calcining temperature is 350-600 ℃, and the calcining time is 4-8 hours.
In the technical scheme, in the step d), the heat preservation temperature is 700-850 ℃, and the heat preservation time is 3 hours.
In the above technical scheme, in the step e), the heating rate is 3 ℃/min.
The invention also provides an application of the ordered mesoporous silica-cobalt oxide based @ graphene composite material, and the ordered mesoporous silica-cobalt oxide based @ graphene composite material is used as a negative electrode material of a lithium ion hybrid capacitor.
Compared with the prior art, the invention has the beneficial effects that: the synthesis method is simple and easy to implement, a certain gap is reserved between the silicon oxide-cobalt oxide-based material and the graphene, and the phenomenon that the silicon oxide-cobalt oxide-based material and the graphene are easy to separate due to different volume expansion coefficients is solved by forming an ordered mesoporous structure; because the silicon oxide-cobalt oxide-based material is simultaneously doped in the graphene, the conductivity of the silicon oxide-cobalt oxide-based @ graphene composite material is greatly improved; by adopting the ordered mesoporous silicon oxide-cobalt oxide-based @ graphene composite material prepared by the invention as a negative electrode material of a lithium ion hybrid capacitor, the cycle stability and the charge and discharge performance of the capacitor can be obviously improved.
Drawings
FIG. 1 is an SEM image of an ordered mesoporous silica-cobalt oxide based @ graphene composite material prepared in example 1 of the present invention;
FIG. 2 is a TEM image of the ordered mesoporous silica-cobalt oxide based @ graphene composite prepared in example 1 of the present invention;
fig. 3 is a nitrogen adsorption and desorption isotherm of the ordered mesoporous silica-cobalt oxide based @ graphene composite material prepared in example 2 of the present invention;
fig. 4 is a charge-discharge rate diagram of a capacitor prepared by using the ordered mesoporous silica-cobalt oxide based @ graphene composite material prepared in example 3 of the present invention as a negative electrode.
Detailed Description
For a further understanding of the invention, reference is made to the following description of the preferred embodiments of the invention taken in conjunction with the accompanying drawings and specific examples, but it is understood that the description is intended to illustrate further features and advantages of the invention, and not to limit the scope of the claims.
The invention discloses a method for synthesizing an ordered mesoporous silica-cobalt oxide-based @ graphene composite material, which comprises the following steps:
step a), mixing graphene oxide with deionized water, and performing ultrasonic treatment to obtain a graphene oxide dispersion liquid;
step b), adding a mixture of a surfactant and a hydrochloric acid solution into the graphene oxide dispersion liquid obtained in the step a), stirring for 12-36 h at room temperature to 45 ℃, then adding a silicon-containing organic matter, and continuously stirring for 12-36 h at room temperature to 45 ℃ to obtain a mixture;
step c), placing the mixture obtained in the step b) in a stainless steel reaction kettle, heating and preserving heat, then naturally cooling to room temperature, carrying out suction filtration on the obtained reaction mixed solution, washing the obtained precipitate with ethanol, adding a mixed solution of ethanol and concentrated hydrochloric acid, stirring for 1-2 h at the room temperature to 65 ℃, carrying out suction filtration on the obtained mixed solution, washing the obtained precipitate with ethanol, and carrying out vacuum drying on the obtained substance at the room temperature to 45 ℃;
step d) calcining the final product obtained in step c) in air, and then performing H2Preserving heat in an/Ar atmosphere, and naturally cooling to room temperature to obtain a silicon oxide @ graphene material;
step e) ball-milling and mixing the silicon oxide @ graphene material obtained in the step d) with cobalt phthalocyanine, and performing ball milling on the mixture in N2Or heating to 550 ℃ under Ar atmosphere, preserving heat for 1-3 h, heating to 700 ℃, preserving heat for 4-8 h, and finally obtaining the ordered mesoporous silica-cobalt oxide-based @ graphene composite material.
In step b), the surfactant is a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer; the molar concentration of the hydrochloric acid solution is preferably 0.5-2 mol/L; the silicon-containing organic matter is one of tetrapropyl orthosilicate, tetraethyl orthosilicate, tetraethoxysilane and tetrapropoxysilane, and preferably tetrapropyl orthosilicate; the mass ratio of the graphene oxide dispersion liquid to the surfactant to the silicon-containing organic matter is 1: (4-8): (10-20). Under the acidic condition, an organic functional group in the graphene oxide is introduced to the surface of a mesoporous silicon-based material pore channel by a copolymerization method, and the degree of order of the mesoporous silicon oxide material pore channel is kept from being damaged.
In the step c), the mixture is placed in a stainless steel reaction kettle to be heated at the temperature of 60-180 ℃, and the heat preservation time is 12-36 hours; in the mixed solution of ethanol and hydrochloric acid, the concentration of hydrochloric acid is preferably 37%, and the volume ratio of ethanol to hydrochloric acid is preferably 100: 6. and (3) after the mixture obtained after the reaction is filtered, washing the precipitate with ethanol, and then adding ethanol and concentrated hydrochloric acid according to the volume ratio of 100: the concentrated ethanol hydrochloric acid mixture of 6 is used for removing the residual polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer in the obtained product.
In the step d), calcining the final product obtained in the step c) in air at 350-600 ℃ for 4-8H, wherein H is2In an atmosphere of/Ar, H2Is 5 percent. Calcining the product obtained in the step c) in the air atmosphere, and then placing the calcined product in H2And (3) preserving the heat for 3 hours at 700-850 ℃ in an Ar atmosphere, and cooling to room temperature so as to ensure that the obtained ordered mesoporous silicon oxide @ graphene composite material has higher purity.
In step e), the weight ratio of the silicon oxide @ graphene material to cobalt phthalocyanine is 3:1, and the heating rate in the step is preferably 3 ℃/min.
The invention also provides an application of the ordered mesoporous silica-cobalt oxide based @ graphene composite material, and the ordered mesoporous silica-cobalt oxide based @ graphene composite material is used as a negative electrode material of a lithium ion hybrid capacitor.
The ordered mesoporous silica-cobalt oxide-based @ graphene composite material, the conductive carbon black and the adhesive are mixed according to the mass ratio of 8.5: 1: 0.5, uniformly mixing, dropwise adding azomethine pyrrolidone, mixing to form uniform slurry, then coating on a copper foil, drying for 30 minutes in a vacuum drying oven at 100 ℃, drying for 12 hours in the vacuum drying oven at 60 ℃, and rolling for later use. Mixing Kurary activated carbon, conductive carbon black and an adhesive in a mass ratio of 8.5: 1: 0.5 mixing and coating on aluminum foil in the same way. Adding electrolyte and packaging into button cell such as 2032. The diaphragm is a celgard2400 diaphragm, and the electrolyte is 1.0mol/L lithium hexafluorophosphate, wherein the weight ratio of lithium hexafluorophosphate to lithium hexafluorophosphate is 2: 1: EC of 2 DEC DMC +10% FEC (fluoroethylene carbonate).
Example 1
Step a), mixing graphene oxide with deionized water, and performing ultrasonic treatment to obtain a graphene oxide dispersion liquid;
step b), adding materials into graphene oxide, a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer and tetrapropyl orthosilicate in a mass ratio of 1:8:20, adding a mixture of the polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer and 2mol/L hydrochloric acid solution into the graphene oxide dispersion liquid obtained in the step a), stirring for 36h at 45 ℃, then adding tetrapropyl orthosilicate, and continuing to stir for 36h at 45 ℃ to obtain a mixture;
step c), placing the mixture obtained in the step b) in a stainless steel reaction kettle, heating to 180 ℃, preserving heat for 36 hours, naturally cooling to room temperature, carrying out suction filtration on the obtained reaction mixed solution, washing the obtained precipitate with ethanol, adding a mixed solution of ethanol and hydrochloric acid in a volume ratio of 100:6, stirring for 2 hours at 65 ℃, carrying out suction filtration on the obtained mixed solution, washing the obtained precipitate with ethanol, and carrying out vacuum drying on the obtained substance at 45 ℃;
calcining the final product obtained in the step c) in air at 600 ℃ for 8H, and then carrying out calcination in H2And (3) keeping the temperature of 850 ℃ for 3h in an Ar atmosphere, and cooling to room temperature to obtain the silicon oxide @ graphene material.
Step e), ball-milling and mixing the silicon oxide @ graphene material obtained in the step d) and cobalt phthalocyanine according to the weight ratio of 3:1, and performing ball milling on the mixture in N2Or heating to 550 ℃ at the speed of 3 ℃/min under Ar atmosphere, preserving heat for 3h, heating to 700 ℃ at the speed of 3 ℃/min, preserving heat for 8h, and finally obtaining the ordered mesoporous silica-cobalt oxide-based @ graphene composite material.
The morphology of the ordered mesoporous silica-cobalt oxide based @ graphene composite material synthesized in example 1 is characterized by SEM and TEM. Fig. 1 is an SEM image of the ordered mesoporous silica-cobalt oxide based @ graphene composite material prepared in example 1, and it can be seen from fig. 1 that silica-cobalt oxide and graphene sheets are bonded together, which illustrates that both silica and cobalt oxide are supported on graphene during the synthesis process. Fig. 2 is a TEM image of the ordered mesoporous silica-cobalt oxide based @ graphene composite material prepared in example 1, and it can be seen from fig. 2 that the pores of the synthesized ordered mesoporous silica-cobalt oxide based @ graphene composite material are arranged in order.
Example 2
Step a), mixing graphene oxide with deionized water, and performing ultrasonic treatment to obtain a graphene oxide dispersion liquid;
step b), adding materials into graphene oxide, a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer and tetrapropyl orthosilicate in a mass ratio of 1:6:15, adding a mixture of the polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer and 1mol/L hydrochloric acid solution into the graphene oxide dispersion liquid obtained in the step a), stirring for 36h at 45 ℃, then adding tetrapropyl orthosilicate, and continuing to stir for 36h at 45 ℃ to obtain a mixture;
step c), placing the mixture obtained in the step b) in a stainless steel reaction kettle, heating to 120 ℃, preserving heat for 24 hours, naturally cooling to room temperature, carrying out suction filtration on the obtained reaction mixed solution, washing the obtained precipitate with ethanol, adding a mixed solution of ethanol and hydrochloric acid in a volume ratio of 100:6, stirring for 2 hours at 65 ℃, carrying out suction filtration on the obtained mixed solution, washing the obtained precipitate with ethanol, and carrying out vacuum drying on the obtained substance at 45 ℃;
calcining the final product obtained in the step c) in air at 500 ℃ for 6H, and then carrying out calcination in H2And (3) in an Ar atmosphere, preserving the heat for 3h at 800 ℃, and cooling to room temperature to obtain the silicon oxide @ graphene material.
Step e), ball-milling and mixing the silicon oxide @ graphene material obtained in the step d) and cobalt phthalocyanine according to the weight ratio of 3:1, and performing ball milling on the mixture in N2Or heating to 550 ℃ at the speed of 3 ℃/min under Ar atmosphere, preserving heat for 2h, heating to 700 ℃ at the speed of 3 ℃/min, preserving heat for 6h, and finally obtaining the ordered mesoporous silica-cobalt oxide-based @ graphene composite material.
Fig. 3 is a nitrogen adsorption and desorption isotherm of the ordered mesoporous silica-cobalt oxide based @ graphene composite material synthesized in example 2, and as can be seen from fig. 3, the nitrogen adsorption and desorption isotherm belongs to a class IV adsorption-desorption curve, which is a characteristic of a mesoporous material, and illustrates that a mesoporous structure exists in the synthesized ordered mesoporous silica-cobalt oxide based @ graphene composite material.
Example 3
Step a), mixing graphene oxide with deionized water, and performing ultrasonic treatment to obtain a graphene oxide dispersion liquid;
step b), adding materials into graphene oxide, a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer and tetrapropyl orthosilicate in a mass ratio of 1:4:10, adding a mixture of the polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer and 0.5mol/L hydrochloric acid solution into the graphene oxide dispersion liquid obtained in the step a), stirring for 36 hours at 45 ℃, then adding tetrapropyl orthosilicate, and continuing to stir for 36 hours at 45 ℃ to obtain a mixture;
step c), placing the mixture obtained in the step b) in a stainless steel reaction kettle, heating to 60 ℃, preserving heat for 12 hours, naturally cooling to room temperature, carrying out suction filtration on the obtained reaction mixed solution, washing the obtained precipitate with ethanol, adding a mixed solution of ethanol and hydrochloric acid in a volume ratio of 100:6, stirring for 2 hours at 65 ℃, carrying out suction filtration on the obtained mixed solution, washing the obtained precipitate with ethanol, and carrying out vacuum drying on the obtained substance at 45 ℃;
calcining the final product obtained in the step c) in air at 350 ℃ for 4H, and then carrying out calcination in H2And (3) in an Ar atmosphere, keeping the temperature at 700 ℃ for 3h, and cooling to room temperature to obtain the silicon oxide @ graphene material.
Step e), ball-milling and mixing the silicon oxide @ graphene material obtained in the step d) and cobalt phthalocyanine according to the weight ratio of 3:1, and performing ball milling on the mixture in N2Or heating to 550 ℃ at the speed of 3 ℃/min under Ar atmosphere, preserving heat for 1h, heating to 700 ℃ at the speed of 3 ℃/min, preserving heat for 4h, and finally obtaining the ordered mesoporous silica-cobalt oxide-based @ graphene composite material.
Fig. 4 is a charge-discharge rate graph of a capacitor prepared by using the ordered mesoporous silica-cobalt oxide based @ graphene composite material prepared in example 3 as a negative electrode, and it can be seen from fig. 4 that the reversible capacity is 500mAh/g and the capacity retention rate is 90% after 3200 cycles of cycle at a current density of 2A/g. Therefore, the lithium ion hybrid capacitor prepared by taking the ordered mesoporous silica-cobalt oxide based @ graphene composite material as the cathode has high charge-discharge reversible capacity and good cycle stability, and mainly because the graphene layer and an inert product formed in the reduction of the silica-cobalt oxide can elastically buffer the volume expansion in the synthesis process of the ordered mesoporous silica-cobalt oxide based @ graphene composite material, so that the integrity of the electrode is maintained. In addition, the mesoporous material has large specific surface area and uniform pore diameter distribution, and the ordered mesoporous structure in the ordered mesoporous silicon oxide-cobalt oxide base @ graphene composite material can provide high specific surface area and enough gaps, shorten a lithium ion passage, improve electrolyte permeability and enhance electrochemical storage of lithium ions. Therefore, the lithium ion hybrid capacitor prepared by taking the ordered mesoporous silica-cobalt oxide based @ graphene composite material as the negative electrode has high charge-discharge reversible capacity and good cycle stability.
Finally, it should be noted that the above examples are only used for illustrating the present invention and do not limit the protection scope of the present invention. In addition, after reading the technical content of the invention, the skilled person can make various changes, modifications or variations to the invention, and all the equivalents thereof also belong to the protection scope defined by the claims of the present application.
Claims (9)
1. A synthetic method of an ordered mesoporous silica-cobalt oxide based @ graphene composite material is characterized by comprising the following steps:
step a), mixing graphene oxide with deionized water, and performing ultrasonic treatment to obtain a graphene oxide dispersion liquid;
step b), adding a mixture of a surfactant and a hydrochloric acid solution into the graphene oxide dispersion liquid obtained in the step a), stirring, then adding a silicon-containing organic matter, and continuing stirring to obtain a mixture;
step c), placing the mixture obtained in the step b) in a stainless steel reaction kettle, heating and preserving heat, then naturally cooling to room temperature, carrying out suction filtration on the obtained reaction mixed solution, washing the obtained precipitate with ethanol, adding a mixed solution of ethanol and concentrated hydrochloric acid, stirring, carrying out suction filtration on the obtained mixed solution, washing the obtained precipitate with ethanol, and carrying out vacuum drying on the obtained substance;
step d) calcining the final product obtained in step c) in air, and then performing H2Preserving heat in the mixed gas atmosphere of Ar, and naturally cooling to room temperature to obtain the silicon oxide @ graphene material;
step e) ball-milling and mixing the silicon oxide @ graphene material obtained in the step d) with cobalt phthalocyanine, and performing ball milling on the mixture in N2Or heating to 550 ℃ under Ar atmosphere, preserving heat for 1-3 h, heating to 700 ℃, preserving heat for 4-8 h, and finally obtaining the ordered mesoporous silica-cobalt oxide-based @ graphene composite material.
2. The method for synthesizing the ordered mesoporous silica-cobalt oxide based @ graphene composite material according to claim 1, is characterized in that: in the step b), the surfactant is a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer.
3. The method for synthesizing the ordered mesoporous silica-cobalt oxide based @ graphene composite material according to claim 1, is characterized in that: in the step b), the silicon-containing organic matter is one of tetrapropyl orthosilicate, tetraethyl orthosilicate, tetraethoxysilane and tetrapropoxysilane.
4. The method for synthesizing the ordered mesoporous silica-cobalt oxide based @ graphene composite material according to claim 1, is characterized in that: in the step b), the mass ratio of the graphene oxide dispersion liquid to the surfactant to the silicon-containing organic matter is 1: (4-8): (10-20).
5. The method for synthesizing the ordered mesoporous silica-cobalt oxide based @ graphene composite material according to claim 1, is characterized in that: in the step c), the heating temperature is 60-180 ℃, and the heat preservation time is 12-36 h.
6. The method for synthesizing the ordered mesoporous silica-cobalt oxide based @ graphene composite material according to claim 1, is characterized in that: in the step d), the calcining temperature is 350-600 ℃, and the calcining time is 4-8 h.
7. The method for synthesizing the ordered mesoporous silica-cobalt oxide based @ graphene composite material according to claim 1, is characterized in that: in the step d), the heat preservation temperature is 700-850 ℃, and the heat preservation time is 3 hours.
8. The method for synthesizing the ordered mesoporous silica-cobalt oxide based @ graphene composite material according to claim 1, is characterized in that: in the step e), the heating rate is 3 ℃/min.
9. The application of the ordered mesoporous silica-cobalt oxide based @ graphene composite material as set forth in any one of claims 1 to 8, wherein: the ordered mesoporous silicon oxide-cobalt oxide based @ graphene composite material is used as a negative electrode material of a lithium ion hybrid capacitor.
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| CN201811550134.5A CN109686578B (en) | 2018-12-18 | 2018-12-18 | Synthetic method and application of ordered mesoporous silica-cobalt oxide-based @ graphene composite material |
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