CN109830670A - A kind of hollow sandwich type SiO of lithium ion battery negative material2/C/MoS2Hybrid microspheres - Google Patents
A kind of hollow sandwich type SiO of lithium ion battery negative material2/C/MoS2Hybrid microspheres Download PDFInfo
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Abstract
The invention belongs to lithium ion battery negative material field, in particular to the hollow sandwich type SiO of a kind of lithium ion battery negative material2/C/MoS2Hybrid microspheres.The hybrid microspheres are using monodispersed polystyrene microsphere as template, the successively hydro-thermal process and high temperature cabonization process by ethyl orthosilicate in the presence of polymerization, two molybdic acid hydrate sodium in microsphere surface of the hydrolysis of microsphere surface, dopamine, is prepared for hollow sandwich type SiO2/C/MoS2Hybrid microspheres.When the microballoon is used as the negative electrode material of lithium ion battery, the cyclical stability of big reversible capacity, outstanding high rate performance and brilliance is presented, is had broad application prospects in field of lithium ion battery.
Description
Technical field
The invention belongs to lithium ion battery negative material field, in particular to a kind of lithium ion battery negative material is with hollow
Sandwich type SiO2/C/MoS2Hybrid microspheres.
Background technique
Lithium ion battery due to having many advantages, such as energy density height, memory-less effect, environmental-friendly and have extended cycle life,
It has been widely used in the multiple fields such as portable electronic device and mixed electrical automobile.Although in commercialized lithium ion battery
Negative electrode material in, graphite has been widely used, but its lower theoretical capacity (372mAhg-1) it has been unable to satisfy exploitation
The requirement of novel high-energy density lithium ion battery.In order to meet to lithium ion battery in energy density and cycle life more
Add harsh requirement, developing high performance electrode material just becomes the important ring in field of lithium ion battery technological innovation.
MoS2It is a kind of typically with the transient metal sulfide of class graphite two-dimensional layered structure, because its is with higher
Theoretical specific capacity (669 mAhg-1) and arouse great concern.MoS2In molybdenum atom be mixed in two layers of compact reactor
Between long-pending sulphur atom, the structure of similar sandwich is formd.MoS2The weaker van der Waals interaction of interlayer, can be fast for lithium ion
Speed spreads and inserts embedding and deintercalation and provides channel.In addition, during discharge with Mo and Li2The generation of S, MoS2It can generate bright
The aobvious specific capacity higher than this negative electrode material of graphite, while can also further increase the high rate performance and stable circulation of material
Property.However, in practical applications, MoS2High rate performance of low electric conductivity when but having seriously undermined the materials'use, and recycle
In volume change and polysulfide the problems such as dissolving can also reduce the cyclical stability of material, this has seriously obstructed MoS2In lithium
Commercially use process in ion battery cathode material.
By MoS2It is compound with other materials, it is to solve MoS2A kind of effective means of material inherent shortcoming.Such as document
MoS [Adv. Mater. 2017,29,1603020] three-dimensional by design2@C composite construction is for improving lithium-ion electric
The performance in pond, efficiently solves MoS2The problems such as mechanical stability caused by the electric conductivity and volume expansion of material is poor.It is domestic
Application No. is 201610909639.0 patents of invention to provide a kind of lithium battery graphene-molybdenum disulfide composite guide plasma-based,
Effectively increase the electric conductivity and cyclical stability of lithium ion battery electrode material.Although this kind of electrode material solves MoS2's
The problem of electric conductivity and cyclical stability, produces the specific capacity higher than graphite electrode, but electrode material entirety specific capacity is still
It is so lower, it need to further increase.Silica (SiO2) due to the theoretical capacity (1965mAhg with superelevation-1), lower put
Piezoelectric voltage, nature rich reserves and lower-price characteristic are a kind of potential cathode material of lithium ion battery.So
And suffer from the fast decay of electrode material dusting and capacity caused by its big volume change during lithiumation and de- lithium
The problems such as, it is unable to get good application so far.If can be by MoS2, carbon and SiO2Three kinds of materials carry out effectively at
Divide and structure designs, the specific capacity of lithium ion battery negative material not only can be improved, moreover it is possible to solve current MoS2And SiO2Material
Inherent shortcoming, to prepare negative electrode material needed for high performance lithium ion battery.But up to the present, do not have also available
In the hollow sandwich type SiO of lithium ion battery negative material2/C/MoS2The report of the preparation of hybrid microspheres and property test.
Summary of the invention
To solve the above-mentioned problems, the present invention passes through in the continuous coated Si O of PS microsphere surface2, PDA and MoS2Lamella is simultaneously
Carbonization treatment is prepared for a kind of hollow sandwich type SiO of ion battery cathode material2/C/MoS2Hybrid microspheres.
The present invention adopts the following technical scheme:
A kind of hollow sandwich type SiO of ion battery cathode material2/C/MoS2Hybrid microspheres, which is characterized in that the hydridization is micro-
Ball center has hollow cavity, and shell is from inside to outside successively by SiO2Layer, C layers and MoS2Layer composition.
The size of the hollow cavity is between 200-600nm.
The SiO2The SiO that layer is 20-40nm by diameter2Particle packing forms.
The C layer with a thickness of 15-40nm.
The MoS2Layer with a thickness of 20-30nm.
A kind of hollow sandwich type SiO of ion battery cathode material2/C/MoS2Hybrid microspheres, its specific preparation process
Process are as follows:
1) preparation of PS template microsphere: measuring a certain amount of styrene, be added dropwise containing 70mL deionized water equipped with
In the round-bottomed flask of churned mechanically 250mL, 70 DEG C are heated to after being passed through high pure nitrogen stirring 30min, 15mL is then added and contains
For the deionized water solution of a certain amount of potassium peroxydisulfate as initiator, it is 230-650nm that 12h is stirred at 70 DEG C and can be obtained diameter
PS microballoon.
2) PS/SiO2The preparation of hybrid microspheres: in the round-bottomed flask of 250mL that the PS prepared in a certain amount of step 1) is micro-
Then ball ultrasonic disperse is added a certain amount of ethyl orthosilicate and stirs 30min, solution is heated to 40 in 160mL ethyl alcohol
It after DEG C, adds a certain amount of ammonium hydroxide and persistently stirs 12h with mechanical stirring, hydrolyze TEOS and be self-assembled to microsphere surface, i.e.,
It can get PS/SiO2Hybrid microspheres.
3) PS/SiO2The preparation of/PDA hybrid microspheres: the PS/SiO prepared in a certain amount of step 2 is taken2Hybrid microspheres ultrasound
The volume ratio for being scattered in 400mL is ethyl alcohol: water=7: a certain amount of trihydroxy aminomethane and DOPA is added in 1 in the mixed solvent
Amine is mixed for 24 hours under room temperature, and dopamine is in PS/SiO2PS/SiO can be obtained in microsphere surface polymerization2/ PDA hybrid microspheres.
4) PS/SiO2/PDA/MoS2The preparation of hybrid microspheres: the PS/SiO prepared in a certain amount of step 3) is taken2/ PDA hydridization
Microballoon, Na2MoO4·2H2O and CS (NH2)2Ultrasonic disperse stirs in the mixed solution that 20mL deionized water and 10mL ethyl alcohol form
After mixing 2h, it is making in the stainless steel autoclave of liner of polytetrafluoroethylene (PTFE) for 100mL that above-mentioned solution, which is transferred to capacity, is connect
Be heated to 200 DEG C and keep the temperature for 24 hours, PS/SiO finally can be obtained three times with deionized water centrifuge washing2/PDA/MoS2
Hybrid microspheres.
5) SiO2/C/MoS2The preparation of hollow hybrid microspheres: with the heating rate of 2 DEG C/min, by what is prepared in step 4)
PS/SiO2/PDA/MoS2Hybrid microspheres are in 800 DEG C in N22h is roasted under gas atmosphere and removes PS template, and SiO can be obtained2/C/MoS2
Hollow hybrid microspheres.
A kind of hollow sandwich type SiO of ion battery cathode material2/C/MoS2Hybrid microspheres pass through structure below
And composition design, solve some bottlenecks encountered when the application of current lithium ion battery negative material, the specific original realized
Manage as follows: 1. microballoon has hollow sandwich structure, not only remains the excellent properties of each component, while structure bring
Synergistic effect further enhances the chemical property of electrode material；2. C layers pass through Si-O-C key and MoS in microballoon2On boundary
Closely connected at face, can be effectively improved the electric conductivity of electrode material, enhance charge transfer effciency, accelerate lithium ion insert it is embedding and
The speed of deintercalation simultaneously reduces the Volumetric expansion in charge and discharge process；③SiO2Layer is by SiO2Particle packing is formed, intergranular
Gap can further decrease resistance when lithium ion transport；4. hollow structure cannot be only used for accommodating electrolyte, while may be used also
For SiO2And MoS2Volume change during embedding and removing provides effective cushion space, improves the circulation of electrode material
Stability.Have benefited from above-mentioned improvement, SiO prepared by the present invention2/C/MoS2Hollow hybrid microspheres are in 200mAg-1Electric discharge
It still can get up to 757.7 mAhg after 100 circle of circulation under electric current-1Reversible capacity, in 2 Ag-1It is presented under discharge current
488.9 mAhg-1Excellent high rate performance.It is in 1Ag-1Discharge current under after the 300 reversible charge and discharge dot cycles of circle, put
Capacitance is positively retained at 584.3 mAhg-1, performance is much better than comparative example C/MoS2Electrode.
A kind of hollow sandwich type SiO of ion battery cathode material2/C/MoS2Hybrid microspheres, with current with MoS2
And its hybrid material is compared as cell negative electrode material, is had the advantage that
1) it is the cavity of 200-600nm that the hybrid microspheres, which have diameter, not only can be relieved lithium ion in charge and discharge process and exists
MoS2And SiO2In insert destruction of the caused volume expansion to material structure when embedding and deintercalation, electrolyte can also be accommodated, improve electricity
Solve contact of the liquid with electrode material.
2) with a thickness of the internal layer SiO of 20-40nm2Stratum granulosum improves the specific capacity of entire negative electrode material, improves the energy of battery
Metric density.
3) carbon-coating that interior thickness is 10-20nm passes through Si-O-C key and SiO2Layer connection, and MoS2Layer then it is tightly packed
The electric conductivity of material not only can be improved in C layer surface, may also function as stable MoS2The effect of layer.
4) outer layer thickness is the MoS of 20-30nm2Layer not only theoretical specific capacity with higher, while also having and being convenient for lithium
Ion inserts embedding and deintercalation channel, and the chemical property of electrode material can be improved.
Detailed description of the invention
Fig. 1 is the SiO that the embodiment of the present invention 1 obtains2/C/MoS2The electron scanning micrograph of hollow hybrid microspheres；
Fig. 2 is the SiO that the embodiment of the present invention 1 obtains2/C/MoS2The transmission electron microscope photo of hollow hybrid microspheres；
Fig. 3 is the SiO that the embodiment of the present invention 1 obtains2/C/MoS2The scanning transmission electron microscope photo pair of hollow hybrid microspheres
The EDX element surface scan figure piece answered；
Fig. 4 is the C/MoS that comparative example 1 of the present invention obtains2The transmission electron microscope photo of hollow hybrid microspheres；
Fig. 5 is the SiO obtained using the embodiment of the present invention 12/C/MoS2The C/MoS that hollow hybrid microspheres and comparative example 1 obtain2In
The electrochemical properties contrast curve chart of empty hybrid microspheres；
Fig. 6 is the SiO obtained using comparative example 1 of the present invention2/C/MoS2The cyclical stability test curve of hollow hybrid microspheres with
And the digital photograph of lightening LED lamp.
Specific embodiment
Principles and features of the present invention are described with reference to embodiments, listed give an actual example is served only for explaining this hair
It is bright, not limit the scope of the invention.
Embodiment 1:
1) preparation of PS template microsphere: 11mL St and 70mL is added in the round-bottomed flask equipped with churned mechanically 250mL and goes
Ionized water leads to high pure nitrogen and stirs 30min, is heated to 70 DEG C, and the deionized water solution that 15mL KPS containing 0.1g is then added is made
For initiator, 12h is stirred at 70 DEG C can be obtained the PS microballoon that diameter is 230nm or so.
2) PS/SiO2The preparation of hybrid microspheres: the PS microballoon prepared in 2g step 1) is surpassed in the round-bottomed flask of 250mL
Sound is scattered in 160mL ethyl alcohol, and 1.5mL TEOS is then added and stirs 30min, solution is heated to 40 DEG C, adds 20mL
Ammonium hydroxide simultaneously persistently stirs 12h with mechanical stirring, hydrolyzes TEOS and is self-assembled to microsphere surface, obtains PS/SiO2Hybrid microspheres.
3) PS/SiO2The preparation of/PDA hybrid microspheres: the PS/SiO prepared in 0.5g step 2 is taken2Hybrid microspheres are led to
It is ethyl alcohol: water=7: 1 in the mixed solvent that ultrasonic disperse, which is crossed, in 400mL volume ratio, 0.25g Tris and 0.75g DA is added, often
Temperature is lower to be mixed for 24 hours, and DA is in PS/SiO2PS/SiO can be obtained in microsphere surface polymerization2/ PDA hybrid microspheres.
4) PS/SiO2/PDA/MoS2The preparation of hybrid microspheres: the PS/SiO prepared in 0.1g step 3) is taken2/ PDA hydridization is micro-
Ball, 0.3g Na2MoO4·2H2O and 0.375g CS (NH2)2Ultrasonic disperse is molten in the mixing of 20mL deionized water and 10mL ethyl alcohol
In liquid, after stirring 2h, it is the stainless steel autoclave that 100mL makes of polytetrafluoroethylene (PTFE) liner that above-mentioned solution, which is transferred to capacity,
In, it is then heated to 200 DEG C and keeps the temperature for 24 hours, PS/SiO finally can be obtained three times with deionized water centrifuge washing2/
PDA/MoS2Hybrid microspheres.
5) sandwich type SiO2/C/MoS2The preparation of hollow hybrid microspheres:, will be in step 4) with the heating rate of 2 DEG C/min
The PS/SiO of preparation2/PDA/MoS2Hybrid microspheres are heated to 800 DEG C and in N22h is roasted under gas atmosphere and removes PS template, can be obtained
To SiO2/C/MoS2Hollow hybrid microspheres.
Fig. 1 is sandwich type SiO2/C/MoS2The electron scanning micrograph of hollow hybrid microspheres shows microballoon table
Face has the MoS of sheet2Layer can be seen that the microballoon has hollow structure from damaged microballoon.Fig. 2 is SiO2/C/MoS2In
The transmission electron microscope picture of empty hybrid microspheres, as can be seen from the figure microballoon has typical hollow structure.Hydridization is micro-
Ball internal layer is the deeper silicon dioxide layer of contrast, and outer layer is coarse MoS2Lamella, and intermediate carbon-coating is in transmission electron microscope photo
In contrast it is smaller, be difficult to be confirmed in transmission electron microscope.But pass through the scanning transmission electron microscope of the microballoon in Fig. 3
The corresponding EDX element surface scan figure piece of photo, we can confirm that the formation of sandwich type microballoon and point of its chemical constituent
Cloth.
Embodiment 2:
1) it the preparation of PS template microsphere: is carried out according to embodiment 1.
2) PS/SiO2The preparation of hybrid microspheres: the PS microballoon prepared in 2g step 1) is surpassed in the round-bottomed flask of 250mL
Sound is scattered in 160mL ethyl alcohol, and 1.0 mL TEOS are then added and stir 30min, solution is heated to 40 DEG C, is added
20mL ammonium hydroxide simultaneously persistently stirs 12h with mechanical stirring, hydrolyzes TEOS and is self-assembled to microsphere surface, obtains PS/SiO2Hydridization
Microballoon.
3) PS/SiO2The preparation of/PDA hybrid microspheres: it is carried out according to embodiment 1.
4) PS/SiO2/PDA/MoS2The preparation of hybrid microspheres: it is carried out according to embodiment 1.
5) SiO2/C/MoS2The preparation of hybrid microspheres: it is carried out according to embodiment 1.
Embodiment 3:
1) it the preparation of PS template microsphere: is carried out according to embodiment 1.
2) PS/SiO2The preparation of hybrid microspheres: it is carried out according to embodiment 1.
3) PS/SiO2The preparation of/PDA hybrid microspheres: the PS/SiO prepared in 0.5g step 2 is taken2Hybrid microspheres by its
By ultrasonic disperse in 400mL volume ratio be ethyl alcohol: water=7: 1 in the mixed solvent, be added 0.15g Tris and 0.45g DA,
It is mixed under room temperature for 24 hours, DA is in PS/SiO2PS/SiO can be obtained in microsphere surface polymerization2/ PDA hybrid microspheres.
4) PS/SiO2/PDA/MoS2The preparation of hybrid microspheres: it is carried out according to embodiment 1.
5) SiO2/C/MoS2The preparation of hybrid microspheres: it is carried out according to embodiment 1.
Comparative example 1:
1) it the preparation of PS template microsphere: is carried out according to embodiment 1.
2) preparation of PS/PDA hybrid microspheres: take the PS microballoon that is prepared in 0.5g step 1) by its by ultrasonic disperse in
400mL volume ratio is ethyl alcohol: water=7: 1 in the mixed solvent, and 0.25g Tris and 0.75g DA is added, is mixed under room temperature
For 24 hours, PS/ PDA hybrid microspheres can be obtained in the polymerization of PS microsphere surface in DA.
3) PS/PDA/MoS2The preparation of hybrid microspheres: the PS/PDA hybrid microspheres prepared in 0.1g step 2,0.3g are taken
Na2MoO4·2H2O and 0.375g CS (NH2)2Ultrasonic disperse is in the mixed solution of 20mL water and 10mL ethyl alcohol, after stirring 2h,
Above-mentioned solution is transferred to capacity to make in the stainless steel autoclave of liner for 100mL of polytetrafluoroethylene (PTFE), is then added
Heat is to 200 DEG C and keeps the temperature for 24 hours, and PS//PDA/MoS can be obtained three times with deionized water centrifuge washing2Hybrid microspheres.
4) C/MoS2The preparation of hollow hybrid microspheres: with the heating rate of 2 DEG C/min, by above-mentioned steps 3) in prepare institute
There is PS/PDA/MoS2Hybrid microspheres are in 800 DEG C in N22h is roasted under gas atmosphere and removes PS template, and C/MoS can be obtained2It is hollow miscellaneous
Change microballoon, pattern is as shown in Figure 4.
Performance test:
1) preparation of lithium ion battery negative electrode: battery cathode by synthesizing as following formula: by 0.025g PVDF (binder)
It is added in 0.75mL 1-Methyl-2-Pyrrolidone solvent and stirs, the stirring of 0.025g electrically conductive graphite is then added into the solution
Uniformly, it is eventually adding hybrid microspheres (the SiO prepared in each embodiment and comparative example of 0.2g2/C/MoS2And C/MoS2) stirring
24h.The sample of preparation is uniformly coated on copper foil with miniature coating machine, by coated copper foil obtained under the conditions of 60 DEG C
Dry 12 h, make organic solvent sufficiently volatilize in drying box.Coated sample is put into vacuum oven in 70 DEG C dry 12
h.The copper foil for being coated with active material is cut into the circle electrode slice of 14 mm of diameter using the slicer that mold is 14 mm.
2) battery assembly: use volume ratio ethylene carbonate (EC): dimethyl carbonate (DMC): diethyl carbonate (DC) is 1
: 1: 1 mixed solvent system configuration concentration is the LiPF of 1mol/L6Solution.Using this solution as electrolyte, using CR2032 type
Battery case, the gloves filled from top to bottom with the sequence of electrode material, electrolyte, diaphragm, lithium metal, gasket and elastic slice in Ar gas
Assembled battery in case (it is required that humidity and oxygen concentration are lower than 0.5ppm in case), battery assembly are surveyed after standing 24 h of activation after the completion
Examination.
3) electro-chemical test: the chemical property of battery uses the Lan electricity electricity of model LAND CT2001A (5V, 10mA)
Pond test macro measures under different current densities within the scope of the voltage window of 1.5-3.0V.Testing battery includes two
A electrode, wherein lithium foil is used as reference electrode and anode simultaneously.
Cathode prepared by embodiment 1 and comparative example 1 is between the high rate performance under different discharge currents and circulating ring number
Relationship is as shown in figure 5, from fig. 5, it can be seen that SiO under any circumstance2/C/MoS2The high rate performance of hollow hybrid microspheres electrode
It is superior to comparative example C/MoS2Hollow hybrid microspheres electrode, in 0.1Ag-1Current density under initial capacity be up to 1039
mAhg-1.It is being recycled by 60 times and is readjusting discharge current for 0.1Ag-1Afterwards, SiO2/C/MoS2Hollow hybrid microspheres electricity
Pole has still maintained 930mAhg-1Capacity, show using the microballoon preparation cathode have excellent high rate performance and circulation
Stability.
Cathode prepared by embodiment 1 is in 1Ag-1Current strength under long period cycle performance curve it is as shown in Figure 6.From
In as can be seen that embodiment 1 prepare hollow hybrid microspheres cathode in 1Ag-1Discharge current under the initial capacity of battery be
900mAhg-1, after the circulation of 300 circles, still maintained 584 mAh g-1Capacity, and its in entire cyclic process
Coulombic efficiency maintains essentially in 100% level, it was demonstrated that the electrode specific capacity with higher and excellent circulation of microballoon preparation
Stability.Illustration in Fig. 6 is the digital photograph of the button cell lightening LED lamp prepared using the electrode material, is shown with this
The lithium ion battery that complex microsphere is prepared as lithium ion battery negative material is working properly.SiO2/C/MoS2Hollow hybrid microspheres
The excellent chemical property of electrode be mainly attributed to the hollow structure of hybrid microspheres can effectively resist lithium ion insert it is embedding and de-
MoS caused by during embedding2And SiO2Destruction of the Volumetric expansion to electrode structure improves the stability of electrode structure, and
SiO2And MoS2The introducing of material has been significantly greatly increased the specific capacity of battery cathode, the C layers of electric conductivity that can then effectively improve electrode.?
Under these structures and the synergistic effect of component, hollow sandwich type SiO2/C/MoS2Hybrid microspheres are formed by cathode and show
Excellent chemical property.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar's energy contents of the present invention much of that are simultaneously implemented accordingly, and it is not intended to limit the scope of the present invention.It is all smart according to the present invention
Equivalent change or modification made by refreshing essence, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of hollow sandwich type SiO of lithium ion battery negative material2/C/MoS2Hybrid microspheres, which is characterized in that this is miscellaneous
Changing microballoon has hollow cavity, and shell is from inside to outside successively by SiO2Layer, C layers and MoS2Layer composition.
2. the hollow sandwich type SiO of lithium ion battery negative material according to claim 12/C/MoS2Hybrid microspheres,
It is characterized in that, the size of hollow cavity is between 200-600nm.
3. the hollow sandwich type SiO of lithium ion battery negative material according to claim 12/C/MoS2Hybrid microspheres,
It is characterized in that, SiO2The SiO that layer is 20-40nm by diameter2Particle packing forms.
4. the hollow sandwich type SiO of lithium ion battery negative material according to claim 12/C/MoS2Hybrid microspheres,
It is characterized in that, C layers with a thickness of 15-40nm.
5. the hollow sandwich type SiO of lithium ion battery negative material according to claim 12/C/MoS2Hybrid microspheres,
It is characterized in that, MOS2Layer with a thickness of 20-30nm.
6. the hollow sandwich type SiO of lithium ion battery negative material described in one of -5 according to claim 12/C/MoS2Hydridization
Microballoon, preparation process include the following steps: the preparation of 1. polystyrene (PS) template microsphere: a certain amount of styrene is measured,
It is added dropwise in the round-bottomed flask equipped with churned mechanically 250mL containing 70mL deionized water, is passed through High Purity Nitrogen gas mixing
70 DEG C are heated to after mixing 30min, deionized water solution of the 15mL containing a certain amount of potassium peroxydisulfate is then added as initiator, 70
12h is stirred at DEG C can be obtained the PS microballoon that diameter is 230-650nm；②PS/SiO2The preparation of hybrid microspheres: 250mL's
By a certain amount of step, 1. then the middle PS microballoon ultrasonic disperse prepared is added a certain amount of in 160mL ethyl alcohol in round-bottomed flask
Ethyl orthosilicate simultaneously stirs 30min, after solution is heated to 40 DEG C, adds a certain amount of ammonium hydroxide and is persistently stirred with mechanical stirring
12h hydrolyzes TEOS and is self-assembled to microsphere surface, can be obtained PS/SiO2Hybrid microspheres；③PS/SiO2/ poly-dopamine
(PDA) preparation of hybrid microspheres: a certain amount of step 2. middle PS/SiO prepared is taken2Hybrid microspheres ultrasonic disperse is in the body of 400mL
Product is than being ethyl alcohol: water=7: 1 in the mixed solvent is added a certain amount of trihydroxy aminomethane and dopamine, mixes and stir under room temperature
It mixes for 24 hours, dopamine is in PS/SiO2PS/SiO can be obtained in microsphere surface polymerization2/ PDA hybrid microspheres；④PS/SiO2/PDA/
MoS2The preparation of hybrid microspheres: a certain amount of step 3. middle PS/SiO prepared is taken2/ PDA hybrid microspheres, Na2MoO4·2H2O and CS
(NH2)2After stirring 2h, above-mentioned solution is shifted in the mixed solution that 20mL deionized water and 10mL ethyl alcohol form for ultrasonic disperse
In the stainless steel autoclave for doing liner with polytetrafluoroethylene (PTFE) for being 100mL to capacity, then it is heated to 200 DEG C and protects
For 24 hours, PS/SiO finally can be obtained with deionized water centrifuge washing in temperature three times2/PDA/MoS2Hybrid microspheres；5. hollow sandwich
Type SiO2/C/MoS2The preparation of hybrid microspheres: with the heating rate of 2 DEG C/min, by step 4. in the PS/SiO for preparing2/PDA/
MoS2Hybrid microspheres are in 800 DEG C in N22h is roasted under gas atmosphere and removes PS template, and SiO can be obtained2/C/MoS2Hollow hydridization is micro-
Ball.
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| CN110233254A (en) * | 2019-07-01 | 2019-09-13 | 郑州大学 | A kind of lithium ion battery negative material shape Fe that rings a bell3O4/C/MoS2Hydridization particle |
| CN113861828A (en) * | 2021-11-20 | 2021-12-31 | 福州大学 | Method for preparing KM-SiO2@ PDA @ MoS2 wear-resistant super-hydrophobic coating by utilizing slag |
| CN114079045A (en) * | 2020-08-14 | 2022-02-22 | 昱瓴新能源科技(浙江)有限公司 | Porous silicon/carbon composite material synthesized in situ by taking porous polymer microspheres as template, preparation method and lithium ion battery |
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