CN109473651A - By ZIF-67 derivative compounds metal sulfide Co in pairs8FeS8The method of/N-C polyhedron nano material - Google Patents
By ZIF-67 derivative compounds metal sulfide Co in pairs8FeS8The method of/N-C polyhedron nano material Download PDFInfo
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/581—Chalcogenides or intercalation compounds thereof
- H01M4/5815—Sulfides
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses one kind by ZIF-67 polyhedron derivative compounds at Co8FeS8The method of/N-C polyhedron nano material.Using ZIF-67 as presoma, derivative turns to hollow Co/N-C polyhedron, then grows Fe in its inner surface3O4Nano particle forms the Co/N-C@Fe of polyhedron nano material3O4, then vulcanized by inert gas high temperature, calcining forms Co8FeS8/ N-C polyhedron nano material.Present invention process operating process is easy, can efficiently control the stoichiometric ratio of multi-component material, and acquisition size is uniform, is evenly distributed and pattern controls good nanocomposite, obtained Co8FeS8When/N-C polyhedron nano material is as lithium ion battery negative material, wherein the electric conductivity of composite material, Co is can be improved in the amorphous carbon of N doping8FeS8Confinement can buffer bulk effect in charge and discharge process in N doping carbon-coating, and therefore, which has preferable cyclical stability and high rate performance.
Description
Technical field
The invention belongs to lithium ion battery negative material production technical fields, and in particular to bimetallic sulfide Co8FeS8/
N-C polyhedron nano material and its synthetic method.
Background technique
Metal-organic framework material (MOFs) is a kind of coordination polymer quickly grown nearly ten years, refers to transition metal
Ion and organic ligand pass through the crystalline porous material with periodic network structure being self-assembly of.It has high hole
Rate, low-density, bigger serface, duct rule, aperture is adjustable and topological structure diversity and the advantages that Scalability, has
Three-dimensional pore structure, generally using metal ion as tie point, it is that zeolite and carbon are received that organic ligand support, which constitutes space 3D and extends,
The important novel porous materials of another class except mitron, are all widely used in catalysis, energy storage and separation.Currently, MOFs
Have become the important research direction of multiple chemical branches such as inorganic chemistry, organic chemistry.Metal organic frame derivative has been made
Electro-catalysis, photocatalysis, the biology load various fields such as medicine and lithium ion battery negative material are had been used for for a series of composite material,
The controllable function in its adjustable aperture makes it better than traditional porous material.Transient metal sulfide is the one kind occurred in recent years
Important functional material.Transient metal sulfide because its theoretical capacity is high, natural abundance is high, it is at low cost, be readily synthesized the advantages that,
It is considered as the anode material of great application prospect in lithium ion battery.So far, a large amount of transient metal sulfides, including cobalt
Sulfide, iron sulfide, manganese sulfide, nickel sulfide etc..Anode material of these metal sulfides as lithium ion has excellent
Different chemical property.In these transient metal sulfides, Co9S8Because it is with excellent chemical property, and obtain wide
General concern.And when MOFs different metal ions containing there are two types of, it can effectively improve chemical property.Bimetallic vulcanization
Object is since electric charge transfer of the metal ion between binary ion increases, so as to which more redox reactions, table occurs
Reveal more excellent chemical property.In the present invention, a kind of bimetallic sulfide Co is synthesized8FeS8/ N-C polyhedron nano material,
In the anode material as lithium ion battery, is acted synergistically by the bimetallic ion of Co and Fe, show excellent electrification
Learn performance.
Summary of the invention
The purpose of the present invention is to provide it is a kind of by ZIF-67 polyhedron derivative compounds at Co8FeS8/ N-C polyhedron is received
Rice material and its method.
Realize the object of the invention technical solution be: by ZIF-67 polyhedron derivative compounds at Co8FeS8/ N-C is more
The method of face body nano material, comprising the following steps:
1) simple substance cobalt/nitrogen-doped carbon Hollow Compound nano material (hollow Co/N-C polyhedron) is prepared
Co(NO3)2·6H2O and 2-methylimidazole are dissolved separately in methanol solution, are stirred at room temperature, to be centrifuged after reaction
Washing is dried after obtaining solid phase to get ZIF-67 polyhedron nano material is arrived；
Under inert gas protection by the ZIF-67 polyhedron nano material of acquirement, with certain temperature calcination, hollow Co/ is formed
N-C polyhedron nano material.
2) Co is prepared8FeS8/ N-C polyhedron nano material
Hollow Co/N-C polyhedron nano material will be obtained to be scattered in oleyl amine and benzyl ether, under the protection of inert gas, into
Co/N-C@Fe can be obtained in row high-temperature liquid-phase reaction a period of time3O4Polyhedron nano material；
The Co/N-C@Fe that will be obtained3O4Polyhedron nano material adds sulphur powder calcining that Co can be obtained under an inert gas8FeS8/N-
C polyhedron nano material.
Preferably, in the step 1), prepared hollow Co/N-C polyhedron pattern is uniform, stable structure, is subsequent
Prepare the Co/N-C@Fe with good pattern3O4Polyhedron nano material provides advantage.
Preferably, in the step 1), Co (NO3)2·6H2The ratio between amount of substance of O and 2-methylimidazole is 1:4.Herein
Under the conditions of can obtain the uniform ZIF-67 polyhedron nano material of pattern.
Preferably, in the step 1), Co (NO3)2·6H2The time of O and 2-methylimidazole reaction is 24 h, main to use
To adjust the size of ZIF-67.
Preferably, in the step 1), the calcination temperature for preparing hollow Co/N-C is 500 ~ 900 DEG C, the reaction time 0.5
~5h.For adjusting the polyhedral crystal form of hollow Co/N-C, degree of graphitization and the integrity degree of polyhedral structure.
Preferably, in the step 2, the mass ratio of hollow Co/N-C polyhedron and ferric acetyl acetonade is 1:0.1 ~ 1, two
The volume ratio of benzyl oxide and oleyl amine is 1:0.1 ~ 10.Mainly to adjust Fe3O4Nano particle is in situ on hollow Co/N-C polyhedron
The amount and Fe of growth3O4Pattern.
Preferably, in the step 2, the mixing of hollow Co/N-C polyhedron and ferric acetyl acetonade in oleyl amine and benzyl ether
Reaction temperature is 200 ~ 350 DEG C in solvent.It is mainly used to adjust Fe3O4Nano particle is given birth in situ on hollow Co/N-C polyhedron
The size of long reaction rate and ferroferric oxide nano granules.Reaction time is the h of 30 min ~ 24.Primarily to adjusting
The completeness of reaction and the size of nano particle.
Preferably, in the step 2, structure is remained intact, and shows good structure, Fe3O4Nanoparticle growth exists
The hollow polyhedral surfaces externally and internally of Co/N-C.
Preferably, in the step 2, the Co/N-C@Fe that will obtain3O4Polyhedron nano material and S powder (mass ratio 1:
0.5 ~ 5), temperature is 500 ~ 900 °C, and calcination time is 0.5 ~ 5h, and heating rate is 1 ~ 10 °C of min-1, heated in argon gas.
After room temperature is cooling, Co can be obtained8FeS8/ N-C polyhedron nano material.Co8FeS8/ N-C polyhedral structure, which will form, to be had
The carbon-coating of good electric conductivity can be obtained the uniform Co of pattern8FeS8/ N-C polyhedron nano material.
Compared with prior art, the present invention has the following obvious advantages: (1) preparation cost is low, and operating process is easy, reaction
Process material requested is less toxic, harmless: (2) Co8FeS8/ N-C polyhedron nanometer material structure makes material lithiumation/goes lithiumation process
The bulk effect of middle generation is effectively relieved, so that active material is effectively protected in high current, long circulating.
Detailed description of the invention
Fig. 1 is the polyhedral transmission electron microscope picture of ZIF-67 of the different amplification prepared in the embodiment of the present invention one.
Fig. 2 is the polyhedral transmission electron microscope of hollow Co/N-C of the different amplification prepared in the embodiment of the present invention one
Figure.
Fig. 3 is the Co of the different amplification prepared in the embodiment of the present invention one8FeS8/ N-C polyhedron nano material it is saturating
Penetrate electron microscope.
Fig. 4 is the Co prepared in the embodiment of the present invention one8FeS8/ N-C polyhedron nano material XRD diagram.
Fig. 5 is the Co prepared in the embodiment of the present invention one8FeS8Different times of the lithium ion battery of/N-C polyhedron nano material
Performance map under rate.
Fig. 6 is to prepare Co in the embodiment of the present invention one8FeS8The lithium ion battery of the polyhedron nano material of/N-C is in electric current
Density is 1A g-1Under long circulating performance map.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments with attached drawing pair
The present invention is described in detail.
Cobalt sulfide, the iron sulfide embedding lithium specific capacity of theory all with higher.Co8FeS8/ N-C polyhedron nano material
When as lithium ion battery negative material, wherein the electric conductivity of composite material, Co is can be improved in the amorphous carbon of N doping8FeS8
Confinement can buffer bulk effect in charge and discharge process in N doping carbon-coating, which has preferable stable circulation
Property and high rate performance.Therefore, Co is obtained by ZIF-67 multi-panel derivatization8FeS8/ N-C polyhedron nano material is a kind of and tool
There is the ion cathode material lithium of application prospect.Using hollow Co/N-C polyhedron as the raw material of subsequent reactions and model, also can be selected
Other patterns and different nano materials are template, such as the Zn/N-C polyhedral structure obtained after being calcined by ZIF-8.
Embodiment 1:
1) simple substance cobalt/nitrogen-doped carbon Hollow Compound nano material (hollow Co/N-C polyhedron) is synthesized
Co(NO3)2·6H2291 mg of O and 328 mg of 2-methylimidazole, which is dissolved separately in 25 ml methanol solutions, to be mixed, room temperature
Lower stirring for 24 hours, to be centrifuged 5 min in 6000 rpm after reaction, with ethanol washing 4 times, is done at 60 DEG C after obtaining solid phase
Dry 6h forms ZIF-67 polyhedron nano material.
ZIF-67 polyhedron nano material is taken to be put into tube furnace, 900 DEG C of calcining 0.5h in argon gas, 1 DEG C of heating rate/
Min obtains hollow Co/N-C polyhedron.
2) Co/N-C@Fe is synthesized3O4Polyhedron nano material
By the obtained hollow Co/N-C polyhedron of hollow Co/N-C polyhedron nano material 100mg and ferric acetyl acetonade 10mg(and
The mass ratio 1:0.1 of ferric acetyl acetonade) it is scattered in the benzyl ether of 1ml and the oleyl amine of 10ml, lead to argon gas, maintains 120 DEG C of water removals
Divide 1h, then lead to argon gas, be warming up to 200 DEG C, keeps 200 DEG C of reactions for 24 hours.To after reaction, be down to room temperature.In 5000 rpm
5 min are centrifuged, are respectively washed with ethyl alcohol 3 times, dry 6h at 60 DEG C after obtaining solid phase.Co/N-C@Fe can be obtained3O4Polyhedron
Nano material.
3) Co is synthesized8FeS8/ N-C polyhedron nano material
The Co/N-C@Fe that will be obtained3O4Polyhedron nano material 100mg and S powder 50mg is individually positioned in two on quartz boat
On different positions, the quartz boat for filling S powder is placed in stove upstream, 0.5h is calcined under 900 °C, heating rate is 1 °C
min-1, heated in argon gas.After room temperature is cooling, Co can be obtained8FeS8/ N-C polyhedron nano material.
Embodiment 2:
1) simple substance cobalt/nitrogen-doped carbon Hollow Compound nano material (hollow Co/N-C polyhedron) is synthesized
Co(NO3)2·6H2291 mg of O and 328 mg of 2-methylimidazole, which is dissolved separately in 25 ml methanol solutions, to be mixed, room temperature
Lower stirring for 24 hours, to be centrifuged 5 min in 6000 rpm after reaction, with ethanol washing 4 times, is done at 60 DEG C after obtaining solid phase
Dry 6h forms ZIF-67 polyhedron nano material.
ZIF-67 polyhedron nano material is taken to be put into tube furnace, 800 DEG C of calcining 2h in argon gas, 2 DEG C of heating rate/
Min obtains hollow Co/N-C polyhedron.
2) Co/N-C@Fe is synthesized3O4Polyhedron nano material
By the obtained hollow Co/N-C polyhedron of hollow Co/N-C polyhedron nano material 100mg and ferric acetyl acetonade 50mg(and
The mass ratio 1:0.5 of ferric acetyl acetonade) it is scattered in the benzyl ether of 5ml and the oleyl amine of 5ml, lead to argon gas, maintains 120 DEG C of moisture removals
1h then leads to argon gas, is warming up to 300 DEG C, keeps 300 DEG C of reaction 1h.To after reaction, be down to room temperature.5000 rpm from
5 min of the heart dries 6h after obtaining solid phase with ethanol washing 3 times at 60 DEG C.Hollow Co/N-C@Fe can be obtained3O4Polyhedron
Nano material.
3) Co is synthesized8FeS8/ N-C polyhedron nano material
The Co/N-C@Fe that will be obtained3O4Polyhedron nano material 100mg and S powder 100mg is individually positioned in two on quartz boat
On different positions, the quartz boat for filling S powder is placed in stove upstream, 2h is heated under 800 °C, heating rate is 2 °C
min-1, heated in argon gas.After room temperature is cooling, Co can be obtained8FeS8/ N-C polyhedron nano material.
Embodiment 3:
1) simple substance cobalt/nitrogen-doped carbon Hollow Compound nano material (hollow Co/N-C polyhedron) is synthesized
Co(NO3)2·6H2291 mg of O and 328 mg of 2-methylimidazole, which is dissolved separately in 25 ml methanol solutions, to be mixed, room temperature
Lower stirring for 24 hours, to be centrifuged 5 min in 6000 rpm after reaction, with ethanol washing 4 times, is done at 60 DEG C after obtaining solid phase
Dry 6h forms ZIF-67 polyhedron nano material.
ZIF-67 polyhedron nano material is taken to be put into tube furnace, 500 DEG C of calcining 5h in argon gas, 10 DEG C of heating rate/
Min obtains hollow Co/N-C polyhedron.
2) Co/N-C@Fe is synthesized3O4Polyhedron nano material
To obtain the hollow Co/N-C polyhedron of hollow Co/N-C polyhedron nano material 100 mg and ferric acetyl acetonade 100mg(and
The mass ratio 1:1 of ferric acetyl acetonade) it is scattered in the benzyl ether of 10ml and the oleyl amine of 1ml, lead to argon gas, maintains 120 DEG C of moisture removals
1 h then leads to argon gas, is warming up to 350 DEG C, keeps 350 DEG C of 0.5 h of reaction.To after reaction, be down to room temperature.5000
Rpm is centrifuged 5 min, is respectively washed with ethyl alcohol 3 times, and 6h is dried at 60 DEG C after obtaining solid phase.Hollow Co/N-C@Fe can be obtained3O4
Polyhedron nano material.
3) Co is synthesized8FeS8/ N-C polyhedron nano material
The hollow Co/N-C@Fe that will be obtained3O4Polyhedron nano material 100mg and S powder 500mg are individually positioned on quartz boat
On two different positions, the quartz boat for filling S powder is placed in stove upstream, 5h is heated under 500 °C, heating rate is 10 °
C·min-1, heated in argon gas.After room temperature is cooling, Co can be obtained8FeS8/ N-C polyhedron nano material.
Product verifying:
Hollow Co/N-C polyhedron made of through the foregoing embodiment, partial size about in 300 ~ 500nm, wall thickness in 40nm or so,
Containing a large amount of mesoporous, this structure has great specific surface area.
Fig. 1 is the polyhedral transmission electron microscope picture of ZIF-67 under the different amplification prepared using the method for the present invention.From
Scheme visible: prepared product is that partial size is about 300-500 nm, and smooth surface.
Fig. 2 is the polyhedral transmission electron microscope of hollow Co/N-C under the different amplification prepared using the method for the present invention
Figure.From figure: prepared product is that partial size is about 300-500 nm, and polyhedron generates cobalt simple substance particle.
Fig. 3 is the Co prepared using the method for the present invention8FeS8The transmission electron microscope picture of/N-C polyhedron nano material.It can from figure
See: pattern is uniform, and can clearly find out that the nano particle grown on polyhedral structure obviously becomes larger.
Fig. 4 is the Co prepared using the method for the present invention8FeS8/ N-C polyhedron nano material XRD diagram.From figure:
Co8FeS8/ N-C polyhedron nano material crystal form is good.Illustrate that our successes of composite nano materials are compound.
Fig. 5 is the Co of preparation8FeS8Performance map under the lithium ion battery different multiplying of/N-C polyhedron nano material.
Co8FeS8/ N-C polyhedron nano material is as negative electrode of lithium ion battery current density respectively in 0.1 A g-1, 0.2 A g-1,
0.5 A g-1, 1 A g-1, 2 A g-1, 5 A g-1, 0.1 A g-1Under specific discharge capacity, from the figure we can see that, 5
A g-1, when still may remain in 390 mAh g-1Specific capacity, from 5 A g-1To 0.1 A g-1When remain to return to 700
mAh g-1, therefore Co8FeS8It is forthright with good times when/N-C polyhedron nano material is as lithium ion battery negative material
Energy.
Fig. 6 is the Co of preparation8FeS8The lithium ion battery of/N-C polyhedron nano material is 1 A g in current density-1Under
Long circulating performance map.570 mAh g are still able to maintain after the circle of circulation 400-1It illustrates, Co8FeS8/ N-C polyhedron nanometer
When the lithium ion battery negative material that material is used as, equally there is good long circulating performance.Its reason may be because unique
Co8FeS8The polyhedron nano material of/N-C is Co8FeS8The bulk effect that/N-C material generates during lithium ion is embedding de- mentions
Effective cushion space is supplied.
The hollow Co/N-C polyhedron that the present invention is obtained using ZIF-67 derivatization passes through second as carrier under high temperature environment
The high temperature pyrolysis of acyl acetone iron carries out Fe to the surfaces externally and internally of polyhedron template3O4The growth in situ of nano particle, in argon gas
High temperature adds sulphur powder to calcine to form Co8FeS8/ N-C polyhedron nano material.The result shows that unique Co8FeS8The polyhedron of/N-C is received
Rice material, not only Co8FeS8It is empty that the bulk effect that/N-C material generates during lithium ion is embedding de- provides effective buffering
Between, its specific surface area is improved but also Co8FeS8The active site of/N-C is largely exposed, and lithium ion is more conducive to
Quick transmission；Co/N-C@Fe3O4Faceted material obtains transient metal sulfide Co after adding sulphur to calcine8FeS8 / N-C is more
Face body nano material, the synergistic effect of transition bimetallic Fe and Co make it possess high specific capacity and high rate performance and excellent
Cyclical stability；And Co8FeS8/ structure of N-C polyhedron nano material makes material lithiumation/goes during lithiumation to generate
Bulk effect be effectively relieved so that active material is effectively protected in high current, long circulating.Therefore,
Co8FeS8/ N-C polyhedron nano material be it is a kind of have excellent performance, the lithium ion battery negative material of great application prospect.
Claims (10)
1. synthesizing bimetallic sulfide Co8FeS8The method of/N-C polyhedron nano material characterized by comprising
1) under inert gas protection by ZIF-67, with certain temperature calcination, the step of hollow Co/N-C faceted material is formed
Suddenly；
2) it disperses above-mentioned hollow Co/N-C faceted material and ferric acetyl acetonade in the mixed solution of oleyl amine and benzyl ether, institute
It obtains dispersion liquid and carries out high-temperature liquid-phase reaction, obtain Co/N-C Fe3O4The step of polyhedron nano material；
3) by Co/N-C@Fe3O4Polyhedron nano material calcines to obtain the Co in the presence of sulphur powder in inert gas8FeS8/N-
The step of C polyhedron nano material.
2. the method as described in claim 1, which is characterized in that the ZIF-67 is by distinguishing cobalt nitrate and 2-methylimidazole
It is dissolved in methanol, reaction is mixed at room temperature, to centrifuge washing after reaction, obtained after gained solid phase is dry.
3. method according to claim 2, which is characterized in that the ratio between amount of substance of cobalt nitrate and 2-methylimidazole be 1:4 ~
8。
4. the method as described in claim 1, which is characterized in that in step 1), by ZIF-67 in 500 ~ 900 DEG C in argon gas
0.5 ~ 5 h of lower calcining.
5. method as described in claim 1 or 4, which is characterized in that heating rate when calcining is 1 ~ 10 DEG C/min.
6. the method as described in claim 1, which is characterized in that in step 2, hollow Co/N-C polyhedron and ferric acetyl acetonade
Mass ratio be 1: 0.1 ~ 1.
7. the method as described in claim 1, which is characterized in that in step 2, the volume ratio of benzyl ether and oleyl amine be 1:0.1 ~
10。
8. the method as described in claim 1, which is characterized in that in step 2, high-temperature liquid-phase reaction temperature is 200 ~ 350 DEG C,
Reaction time is the h of 30 min ~ 24.
9. the method as described in claim 1, which is characterized in that in step 3), hollow Co/N-C@Fe3O4With the mass ratio of sulphur powder
It is 1: 0.5 ~ 5.
10. the method as described in claim 1, which is characterized in that in step 3), calcination temperature is 500 ~ 900 DEG C, when calcining
Between be 0.5 ~ 5 h.
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| CN110164703A (en) * | 2019-06-21 | 2019-08-23 | 江苏科技大学 | Porous Fe3O4/ C faceted material and its preparation method and application |
| CN110164703B (en) * | 2019-06-21 | 2021-07-09 | 江苏科技大学 | Porous Fe3O4/C polyhedral material and preparation method and application thereof |
| CN111533178A (en) * | 2020-04-30 | 2020-08-14 | 江苏师范大学 | Method for preparing Zn-Co-S composite material based on multi-metal organic framework compound |
| CN113501552A (en) * | 2021-07-29 | 2021-10-15 | 西安理工大学 | MOFs-derived hollow polyhedrons Co3S4And preparation method and application thereof |
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