CN106972161A - A kind of preparation method of nitrogen-doped graphene/copper sulfide/hollow sulphur composite - Google Patents
A kind of preparation method of nitrogen-doped graphene/copper sulfide/hollow sulphur composite Download PDFInfo
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- CN106972161A CN106972161A CN201710218777.9A CN201710218777A CN106972161A CN 106972161 A CN106972161 A CN 106972161A CN 201710218777 A CN201710218777 A CN 201710218777A CN 106972161 A CN106972161 A CN 106972161A
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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Abstract
A kind of preparation method of nitrogen-doped graphene/copper sulfide/hollow sulphur composite, including following several steps：Step（1）Sulphur powder is added to stirring and dissolving in carbon disulfide and forms homogeneous solution；Step（2）It is added to after high-purity nickel powder is passed through into high energy ball mill ball milling, ball milling in above-mentioned solution, stirring forms homogeneous suspension, mechanical agitation forms the spheric granules of sulphur cladding after spray drying；Step（3）Spheric granules is added in addition ferric chloride solution, stirring reaction, washing, filtering；Step（4）In the solution that sediment after filtering is added to containing copper chloride, thioacetamide and surfactant, homogeneous suspension is stirred into, heating stirring reaction, centrifugation, washing obtain vulcanizing the sulfur granules of copper clad.Hollow-core construction is designed as volumetric expansion headspace of the sulfur materials in charge and discharge process in the composite, can effectively improve chemical property.
Description
Technical field
The present invention relates to nano material synthesis, more particularly to a kind of preparation method of lithium sulfur battery anode material.
Background technology
Lithium-sulfur cell is that, using lithium metal as negative pole, elemental sulfur is the battery system of positive pole.Lithium-sulfur cell have two put
Level platform（About 2.4 V and 2.1 V）, but its electrochemical reaction mechanism is more complicated.Lithium-sulfur cell has specific energy high
（2600 Wh/kg）, specific capacity it is high（1675 mAh/g）, low cost and other advantages, it is considered to be very promising a new generation's electricity
Pond.But at present the problems such as there is low active material utilization, low cycle life and poor security, this seriously governs lithium
The development of sulphur battery.Causing the main cause of above mentioned problem has the following aspects：（1）Elemental sulfur is electronics and ion insulation
Body, room-temperature conductivity is low（5×10-30S·cm-1）, because the sulphur without ionic state is present, thus it is tired as positive electrode activation
It is difficult；（2）The high poly- many lithium sulfide Li of state produced in electrode process2Sn（8 ＞ n >=4）It is soluble in electrolyte, positive and negative
Concentration difference is formed between pole, negative pole is moved in the presence of concentration gradient, the high poly- many lithium sulfides of state are reduced into low by lithium metal
The poly- many lithium sulfides of state.The progress of reaction more than, the oligomeric many lithium sulfides of state are assembled in negative pole, finally formed between electrodes
Concentration difference, moves to positive pole and is oxidized to the high many lithium sulfides of poly- state again.This phenomenon is referred to as shuttle effect, reduces sulphur activity
The utilization rate of material.While insoluble Li2S and Li2S2Cathode of lithium surface is deposited on, lithium-sulfur cell is further degrading
Performance；（3）React final product Li2S is equally electronic body, can be deposited on sulfur electrode, and lithium ion vulcanizes in solid-state
Migration velocity is slow in lithium, makes electrochemical reaction kinetic rate slack-off；（4）Sulphur and final product Li2S density is different, works as sulphur
Rear volumetric expansion about 79% is lithiated, Li is easily caused2S efflorescence, causes the safety problem of lithium-sulfur cell.Above-mentioned not enough restriction
The development of lithium-sulfur cell, this is also the Important Problems that current lithium-sulfur cell research needs to solve.
The content of the invention
, should the technical problem to be solved in the present invention is to provide a kind of nitrogen-doped graphene/copper sulfide/hollow sulphur composite
Composite is made up of the graphene network of the sulphur of hollow-core construction, the copper sulphide material of sulphur external sheath and N doping, electric conductivity
Good provides conductive network in outer layer graphene, and the sulfenyl material of hollow-core construction provides the space of expansion, sulphur external sheath
Copper sulfide can adsorb the dissolving of discharging product polysulfide, improve the chemical property of material.
It is as follows that the present invention provides a kind of preparation method flow of nitrogen-doped graphene/copper sulfide/hollow sulphur composite：
（1）Sulphur powder is added to stirring and dissolving in carbon disulfide and forms homogeneous solution；
（2）It is added to after high-purity nickel powder is passed through into high energy ball mill ball milling, ball milling in above-mentioned solution, stirring forms homogeneous hang
Supernatant liquid, mechanical agitation forms the spheric granules of sulphur cladding after spray drying；
（3）Spheric granules is added in addition ferric chloride solution, stirring reaction, washing, filtering.
（4）In the solution that sediment after filtering is added to containing copper chloride, thioacetamide and surfactant, stirring
Into homogeneous suspension, heating stirring reaction, centrifugation, washing obtain vulcanizing the sulfur granules of copper clad；
（5）By nitrogen-doped graphene be added to the water ultrasonic disperse formation unit for uniform suspension, then will vulcanize copper clad sulfur granules
Add, stirring, suction filtration obtains composite after washing.
Step（1）The carbon disulfide solution concentration of middle sulphur is 1-5g/mL;
Step（2）Middle nickel powder：The mass ratio of sulphur powder is 0.05-0.2:1, Ball-milling Time is 0.5-2 hours, and the mechanical agitation time is
0.5-1 hours;
Step（3）The concentration of middle ferric chloride solution is 1-2mol/L, and the stirring reaction time is 1-5 hours；
Step（4）Middle copper chloride：Thioacetamide：Surfactant：The mass ratio of sulphur is 1-2：1-1.5：0.1-0.2：10, plus
The temperature of thermal response is:60-90 DEG C, the reaction time is 5-30 minutes, and surfactant can be neopelex, two
One or more in octyl group sodium sulfosuccinate, sodium stearyl sulfate;
Step（5）The concentration of middle nitrogen-doped graphene suspension is 0.5-2g/L, nitrogen-doped graphene nitrogen-doped graphene：Sulphur
Mass ratio is 1-2：10, the reaction time of stirring reaction is 5-30 minutes.
The present invention has the advantages that：（1）Nitrogen-doped graphene has the electrical conductivity of superelevation, is prepared by this method
The electronics that the nitrogen-doped graphene/copper sulfide gone out/hollow sulphur composite can effectively improve lithium sulfur battery anode material is led
Electric rate and ionic conductivity, while the nitrogen on graphene can carry out chemisorbed to polysulfide, sulphur when reducing discharge and recharge is damaged
Lose；（2）The cladding of copper sulfide can carry out physical protection to sulfenyl material in the composite, while copper sulfide also can be to many vulcanizations
Thing carries out chemisorbed, reduces shuttle effect；（3）Hollow-core construction is designed as sulfur materials in charge and discharge process in the composite
In volumetric expansion headspace, chemical property can have been effectively improved.
Brief description of the drawings
Fig. 1 is the process chart of the present invention.
Fig. 2 is the charge-discharge performance figure of composite of the present invention.
Embodiment
Below in conjunction with the accompanying drawings, the preferably embodiment to the present invention is described in further detail：
Embodiment 1
（1）100g sulphur powders are added to the solution of stirring and dissolving formation 1g/mL in carbon disulfide；
（2）5g high-purity nickel powders are passed through into high energy ball mill, ball milling 0.5 hour is added to after ball milling in above-mentioned solution, stir shape
Into homogeneous suspension, mechanical agitation 0.5 hour forms the spheric granules of sulphur cladding after spray drying；
（3）Spheric granules is added in addition 1mol/L ferric chloride solutions, stirring reaction 5 hours, washing, filtering.
（4）Sediment after filtering is added to copper chloride containing 10g, 10g thioacetamides and 1g DBSAs
In the solution of sodium, homogeneous suspension is stirred into, 60 DEG C of stirring reactions are heated to 30 minutes, centrifugation, washing obtain vulcanizing copper clad
Sulfur granules；
（5）It is 0.5g/L suspension by the 10g nitrogen-doped graphenes ultrasonic disperse formation uniform concentration that is added to the water, then by sulphur
The sulfur granules for changing copper clad are added, and stirring, suction filtration obtains composite after washing.
Embodiment 2
（1）100g sulphur powders are added to the solution of stirring and dissolving formation 5g/mL in carbon disulfide；
（2）20g high-purity nickel powders are passed through into high energy ball mill, ball milling 2 hours is added to after ball milling in above-mentioned solution, stir shape
Into homogeneous suspension, mechanical agitation 1 hour forms the spheric granules of sulphur cladding after spray drying；
（3）Spheric granules is added in addition 2mol/L ferric chloride solutions, stirring reaction 1 hour, washing, filtering.
（4）Sediment after filtering is added to the sour sulphur of copper chloride containing 20g, 15g thioacetamides and 2g dioctyl succinates
In the solution of sour sodium, homogeneous suspension is stirred into, 90 DEG C of stirring reactions are heated to 5 minutes, centrifugation, washing obtain vulcanizing copper clad
Sulfur granules；
（5）By 20g nitrogen-doped graphenes be added to the water ultrasonic disperse formation uniform concentration be 2g/L suspension, then will vulcanization
The sulfur granules of copper clad are added, and stirring, suction filtration obtains composite after washing.
Embodiment 3
（1）100g sulphur powders are added to the solution of stirring and dissolving formation 2g/mL in carbon disulfide；
（2）10g high-purity nickel powders are passed through into high energy ball mill, ball milling 1 hour is added to after ball milling in above-mentioned solution, stir shape
Into homogeneous suspension, mechanical agitation 0.6 hour forms the spheric granules of sulphur cladding after spray drying；
（3）Spheric granules is added in addition 1.5mol/L ferric chloride solutions, stirring reaction 3 hours, washing, filtering.
（4）Sediment after filtering is added to copper chloride containing 15g, 12g thioacetamides and 1.5g octadecyl sulfuric acid
In the solution of sodium, homogeneous suspension is stirred into, 70 DEG C of stirring reactions are heated to 15 minutes, centrifugation, washing obtain vulcanizing copper clad
Sulfur granules；
（5）By 15g nitrogen-doped graphenes be added to the water ultrasonic disperse formation uniform concentration be 1g/L suspension, then will vulcanization
The sulfur granules of copper clad are added, and stirring, suction filtration obtains composite after washing.
Embodiment 4
（1）100g sulphur powders are added to the solution of stirring and dissolving formation 3g/mL in carbon disulfide；
（2）15g high-purity nickel powders are passed through into high energy ball mill, ball milling 1.5 hours is added to after ball milling in above-mentioned solution, stirred
Homogeneous suspension is formed, mechanical agitation 0.7 hour forms the spheric granules of sulphur cladding after spray drying；
（3）Spheric granules is added in addition 1.2mol/L ferric chloride solutions, stirring reaction 4 hours, washing, filtering.
（4）Sediment after filtering is added to copper chloride containing 12g, 11g thioacetamides and 1.2g detergent alkylate sulphurs
In acid sodium solution, homogeneous suspension is stirred into, 80 DEG C of stirring reactions are heated to 10 minutes, centrifugation, washing obtain vulcanizing copper clad
Sulfur granules；
（5）It is 1.5g/L suspension by the 12g nitrogen-doped graphenes ultrasonic disperse formation uniform concentration that is added to the water, then by sulphur
The sulfur granules for changing copper clad are added, and stirring, suction filtration obtains composite after washing.
Embodiment 5
（1）100g sulphur powders are added to the solution of stirring and dissolving formation 4g/mL in carbon disulfide；
（2）18g high-purity nickel powders are passed through into high energy ball mill, ball milling 1.6 hours is added to after ball milling in above-mentioned solution, stirred
Homogeneous suspension is formed, mechanical agitation 0.8 hour forms the spheric granules of sulphur cladding after spray drying；
（3）Spheric granules is added in addition 1.8mol/L ferric chloride solutions, stirring reaction 2 hours, washing, filtering.
（4）Sediment after filtering is added to copper chloride containing 18g, 14g thioacetamides and 1.8g dioctyl succinates acid
In the solution of sodium sulfonate, homogeneous suspension is stirred into, 75 DEG C of stirring reactions are heated to 25 minutes, centrifugation, washing obtain copper sulfide
The sulfur granules of cladding；
（5）It is 1.8g/L suspension by the 18g nitrogen-doped graphenes ultrasonic disperse formation uniform concentration that is added to the water, then by sulphur
The sulfur granules for changing copper clad are added, and stirring, suction filtration obtains composite after washing.
The preparation and performance test of electrode；By composite, acetylene black and PVDF in mass ratio 80：10：10 in NMP
Mixing, it is electrode film to be coated on aluminium foil, and metal lithium sheet is that, to electrode, CELGARD 2400 is barrier film, 1mol/L LiTFSI/
DOL-DME (volume ratios 1:1) it is electrolyte, 1mol/L LiNO3 is additive, button electricity is assembled into full of Ar glove boxes
Pond, constant current charge-discharge test is carried out using Land battery test systems.Charging/discharging voltage scope is 1-3V, and current density is
0.5C, performance is as shown in table 1.
Table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| First discharge specific capacity（mAh/g） | 1020 | 1010 | 970 | 980 | 1010 |
Fig. 2 is the charge-discharge performance figure that the composite of the embodiment of the present invention 1 is prepared into lithium-sulfur cell.As can be seen from the figure charge and discharge
Electrical efficiency can reach more than 99%, and first charge-discharge capacity is 1020 mAh/g, and efficiency for charge-discharge is 84.3%, second of charge and discharge
Capacitance is 1150 mAh/g, after 200 charge and discharge cycles, and relative to second discharge capacity of capacity still possesses more than 85%,
Shuttle effect can effectively be suppressed by illustrating the structure of the composite, improve the life-span of sulphur battery.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (6)
1. the preparation method of a kind of nitrogen-doped graphene/copper sulfide/hollow sulphur composite, it is characterised in that including following several
Individual step：
Step（1）Sulphur powder is added to stirring and dissolving in carbon disulfide and forms homogeneous solution；
Step（2）It is added to after high-purity nickel powder is passed through into high energy ball mill ball milling, ball milling in above-mentioned solution, stirring forms homogeneous
Suspension, mechanical agitation, after spray drying formed sulphur cladding spheric granules；
Step（3）Spheric granules is added in addition ferric chloride solution, stirring reaction, washing, filtering；
Step（4）In the solution that sediment after filtering is added to containing copper chloride, thioacetamide and surfactant, stirring
Into homogeneous suspension, heating stirring reaction, centrifugation, washing obtain vulcanizing the sulfur granules of copper clad；
Step（5）By nitrogen-doped graphene be added to the water ultrasonic disperse formation unit for uniform suspension, then will vulcanize copper clad sulphur
Particle is added, and stirring, suction filtration obtains composite after washing.
2. preparation method as claimed in claim 1, it is characterised in that step（1）The carbon disulfide solution concentration of middle sulphur is 1-
5g/mL。
3. preparation method as claimed in claim 1, it is characterised in that step（2）Middle nickel powder：The mass ratio of sulphur powder is 0.05-
0.2:1, Ball-milling Time is 0.5-2 hours, and the mechanical agitation time is 0.5-1 hours.
4. preparation method as claimed in claim 1, it is characterised in that step（3）The concentration of middle ferric chloride solution is 1-2mol/
L, the stirring reaction time is 1-5 hours.
5. preparation method as claimed in claim 1, it is characterised in that step（4）Middle copper chloride：Thioacetamide：Live on surface
Property agent：The mass ratio of sulphur is 1-2：1-1.5：0.1-0.2：10, the temperature of heating response is:60-90 DEG C, the reaction time is 5-30
Minute, surfactant can be one in neopelex, dioctyl succinate disulfonate acid, sodium stearyl sulfate
Plant or a variety of.
6. preparation method as claimed in claim 1, it is characterised in that step（5）The concentration of middle nitrogen-doped graphene suspension
For 0.5-2g/L, nitrogen-doped graphene nitrogen-doped graphene：The mass ratio of sulphur is 1-2：10, the reaction time of stirring reaction is 5-
30 minutes.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018184157A1 (en) * | 2017-04-05 | 2018-10-11 | 深圳市佩成科技有限责任公司 | Preparation method of composite material having nitrogen-doped graphene/copper sulfide/hollow sulfur particles |
| CN108831748A (en) * | 2018-06-27 | 2018-11-16 | 安徽大学 | A kind of nitrogen-doped graphene modification four vulcanization seven bronze medals/copper sulfide composite material and preparation methods and application down |
| CN108899493A (en) * | 2018-06-22 | 2018-11-27 | 中南大学 | A kind of nano-sulfur/metal sulfide composite material and preparation method and the application as electrode material |
| CN109473606A (en) * | 2018-10-30 | 2019-03-15 | 肇庆市华师大光电产业研究院 | A kind of self-support functions interlayer and preparation method thereof for lithium-sulfur cell |
| CN109847784A (en) * | 2019-02-21 | 2019-06-07 | 青岛科技大学 | A kind of Cu1.81S/Ni1.03S/NG/NF composite material and preparation method |
| CN112877117A (en) * | 2021-01-21 | 2021-06-01 | 徐州振峰新材料科技有限公司 | Efficient low-price nano-copper/sulfur-doped graphene modified lubricating oil |
| CN114368775A (en) * | 2021-12-20 | 2022-04-19 | 江苏大学 | Room temperature rapid preparation method of transition metal sulfide |
| CN114914442A (en) * | 2022-05-11 | 2022-08-16 | 重庆化工职业学院 | Application of copper sulfide material in battery positive electrode material, electrode and battery |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018184157A1 (en) * | 2017-04-05 | 2018-10-11 | 深圳市佩成科技有限责任公司 | Preparation method of composite material having nitrogen-doped graphene/copper sulfide/hollow sulfur particles |
| CN108899493A (en) * | 2018-06-22 | 2018-11-27 | 中南大学 | A kind of nano-sulfur/metal sulfide composite material and preparation method and the application as electrode material |
| CN108899493B (en) * | 2018-06-22 | 2020-07-31 | 中南大学 | Nano sulfur/metal sulfide composite material, preparation method thereof and application of nano sulfur/metal sulfide composite material as electrode material |
| CN108831748A (en) * | 2018-06-27 | 2018-11-16 | 安徽大学 | A kind of nitrogen-doped graphene modification four vulcanization seven bronze medals/copper sulfide composite material and preparation methods and application down |
| CN109473606A (en) * | 2018-10-30 | 2019-03-15 | 肇庆市华师大光电产业研究院 | A kind of self-support functions interlayer and preparation method thereof for lithium-sulfur cell |
| CN109847784A (en) * | 2019-02-21 | 2019-06-07 | 青岛科技大学 | A kind of Cu1.81S/Ni1.03S/NG/NF composite material and preparation method |
| CN109847784B (en) * | 2019-02-21 | 2021-11-09 | 青岛科技大学 | Cu1.81S/Ni1.03S/NG/NF composite material and preparation method thereof |
| CN112877117A (en) * | 2021-01-21 | 2021-06-01 | 徐州振峰新材料科技有限公司 | Efficient low-price nano-copper/sulfur-doped graphene modified lubricating oil |
| CN114368775A (en) * | 2021-12-20 | 2022-04-19 | 江苏大学 | Room temperature rapid preparation method of transition metal sulfide |
| CN114914442A (en) * | 2022-05-11 | 2022-08-16 | 重庆化工职业学院 | Application of copper sulfide material in battery positive electrode material, electrode and battery |
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