CN109148861A - Sulphur/iron oxide/graphene battery positive electrode, preparation method and lithium-sulfur cell - Google Patents
Sulphur/iron oxide/graphene battery positive electrode, preparation method and lithium-sulfur cell Download PDFInfo
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- CN109148861A CN109148861A CN201811002702.8A CN201811002702A CN109148861A CN 109148861 A CN109148861 A CN 109148861A CN 201811002702 A CN201811002702 A CN 201811002702A CN 109148861 A CN109148861 A CN 109148861A
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- 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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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H01M4/02—Electrodes composed of, or comprising, active material
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- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to technical field of nano material more particularly to a kind of sulphur/iron oxide/graphene battery positive electrode, preparation method and lithium-sulfur cells.The invention discloses a kind of preparation methods of sulphur/iron oxide/graphene battery positive electrode, comprising the following steps: step 1: graphene-ferric oxide nano composite material is made by hydro-thermal reaction in nitrogen-doped graphene and iron salt solutions；Step 2: graphene-ferric oxide nano composite material and elemental sulfur being mixed to get mixture, sulphur/iron oxide/graphene battery positive electrode is made by vacuum fusion diffusion reaction in mixture.The invention also discloses the sulphur/iron oxide/graphene battery positive electrodes and its lithium-sulfur cell that are prepared by the above method.The present invention, which solves elemental sulfur in the prior art, cannot efficiently use in lithium sulfur battery anode material and then cause short lithium-sulfur cell service life, electric conductivity, cyclical stability and the poor technical problem of security performance.
Description
Technical field
The present invention relates to technical field of nano material more particularly to a kind of sulphur/iron oxide/graphene battery positive electrode,
Preparation method and lithium-sulfur cell.
Background technique
As new energy technology develops rapidly, the especially technological progress of the industries such as mobile electronic product and electric car,
The novel energy storage cell of high-energy-density, long circulation life and low cost becomes important research and development direction.Lithium ion battery
It is current most widely used most successful battery system, but is limited by positive electrode specific capacity, is guaranteeing cell safety use
In the case where, the specific capacity of anode material for lithium-ion batteries is difficult to improve a lot again, compared with lithium ion battery, lithium-sulfur cell
As energy-storage battery of new generation, theoretical energy density is up to 2600Wh/kg, significantly larger than current commercialized lithium-ion electric
Pond.
However, lithium-sulfur cell encounters some problems in practice, for example, positive electrode active materials elemental sulfur and its
The electric conductivity of discharging product is poor；" the shuttle effect " of more lithium sulfides can corrode cathode while losing active material sulphur；It fills
The more lithium sulfides of intermediate product in discharge process are soluble in electrolyte, and active material is made to be detached from electrode；Positive active material sulphur exists
Volume can become larger in use process.Wherein, in the above problem, elemental sulfur is also easy to produce more when as lithium sulfur battery anode material
The problem of sulfide and elemental sulfur cannot effectively be fixed into hinder the most serious in lithium-sulfur cell, which not only reduces
The service life and cyclical stability of lithium-sulfur cell also result in the decline of lithium-sulfur cell security performance.
Therefore, the prior art is also easy to produce polysulfide, Yi Jidan due to elemental sulfur when as lithium sulfur battery anode material
Matter sulphur cannot be fixed effectively, so cause short lithium-sulfur cell service life, electric conductivity, cyclical stability and security performance it is poor at
For those skilled in the art's technical problem urgently to be resolved.
Summary of the invention
In view of this, the present invention provides a kind of sulphur/iron oxide/graphene battery positive electrode, preparation method and lithium sulphur
Battery solves and is also easy to produce polysulfide and simple substance when as lithium sulfur battery anode material in elemental sulfur in the prior art
Sulphur cannot be fixed effectively, and then lead to short lithium-sulfur cell service life, electric conductivity, cyclical stability and the poor skill of security performance
Art problem.
The present invention provides a kind of preparation methods of sulphur/iron oxide/graphene battery positive electrode, comprising the following steps:
Step 1: graphene-ferric oxide nano composite wood is made by hydro-thermal reaction in nitrogen-doped graphene and iron salt solutions
Material；
Step 2: the graphene-ferric oxide nano composite material and elemental sulfur are mixed to get mixture, it will be described mixed
It closes object and sulphur/iron oxide/graphene battery positive electrode is made by vacuum fusion diffusion reaction.
It is furthermore preferred that before step 1 further including by Hummers method by graphene oxide and nitrogen source at 90~110 DEG C
Nitrogen-doped graphene is made in 18~36h of lower reaction.
It is furthermore preferred that the nitrogen source includes one of urea, cyanamide, aniline and cyanamid dimerization or a variety of.
Further preferably, the nitrogen source includes one of urea, cyanamide and cyanamid dimerization or a variety of.
Further preferably, the reaction temperature of the Hummers method is 90 DEG C, 100 DEG C or 110 DEG C
Further preferably, the reaction time of the Hummers method be for 24 hours, 18h, 36h or 30h.
Preferably, the temperature of the hydro-thermal reaction is 90~120 DEG C.
It is furthermore preferred that the temperature of the hydro-thermal reaction is 100 DEG C, 110 DEG C or 120 DEG C.
Preferably, the time of the hydro-thermal reaction is 1~6h.
It is furthermore preferred that the time of the hydro-thermal reaction is 1h, 2h or 4h.
Preferably, the solute of the iron salt solutions include one of frerrous chloride, ferric sulfate, iron chloride and ferric nitrate or
It is a variety of.
Preferably, the ratio of the solute of the iron salt solutions and the nitrogen-doped graphene is 0.01~0.06:1mol/g.
It is furthermore preferred that the solvent of the iron salt solutions include one of methanol, carbon disulfide, dehydrated alcohol and acetone or
It is a variety of.
Further preferably, the solvent of the iron salt solutions is dehydrated alcohol.
Preferably, the content of element sulphur is 40%~80% in the mixture.
It is furthermore preferred that in the mixture element sulphur content 40%, 50%, 60%, 70% or 80%.
Preferably, the temperature of the vacuum fusion diffusion reaction is 130~160 DEG C.
It is furthermore preferred that the temperature of the vacuum fusion diffusion reaction is 130 DEG C, 140 DEG C, 155 DEG C or 160 DEG C.
Preferably, the time of the vacuum fusion diffusion reaction is 6~36h.
It is furthermore preferred that the time of the vacuum fusion diffusion reaction is 6h, 10h or 20h.
The present invention also provides a kind of sulphur/iron oxide/graphene battery positive electrodes, by above-mentioned sulphur/iron oxide/graphite
The preparation method of alkene cell positive material is made.
The present invention also provides a kind of lithium-sulfur cell, cathode is lithium-sulfur cell negative electrode material, and anode includes above-mentioned
Sulphur/iron oxide/graphene battery positive electrode.
Sulphur/iron oxide/graphene battery positive electrode that the present invention is prepared, wherein nitrogen-doped graphene has superelevation
Specific surface area and a large amount of active site, can be improved the load capacity of sulphur, further increase in positive electrode the content of sulphur and just
The electric conductivity of pole material.Nitrogen-doped graphene and iron salt solutions are passed through hydro-thermal method, on the surface of graphene life in situ by the present invention
The lesser ferric oxide particles of size are grown, aoxidize the surface of nitrogen-doped graphene can with uniform load nano-metal-oxide i.e.
Iron.Its principle is that the coordination of a large amount of active site of nitrogen-doped graphene and iron ion can adsorb fixed iron ion, quilt
Fixed iron ion and deionized water occurs hydrolysis and is converted into iron hydroxide, then is made by temperature when controlling hydro-thermal reaction
Iron hydroxide decomposition in situ generates iron oxide, and whole process iron is not easy to reunite, is uniformly dispersed, so particle is smaller.Iron oxide
Grain is smaller, and surface can be bigger, so that it not only stronger can be adsorbed sulphur and polysulfide by chemical action, but also can be catalyzed
Intermediate product polysulfide is converted into protosulphide, reduces the content of high-sulfur compound in electrolyte, not only increases transformation efficiency,
The volume change that positive electrode has also been buffered by adsorbing polysulfide, keeps the electrode structure of conducting matrix grain and active material,
Capacity stability and service life are improved, to be greatly improved the chemical property of lithium-sulfur cell.
The embodiment of the present invention obtains the stone for having a large amount of active sites by reacting in graphene oxide with nitrogenous substance
Black alkene improves the load sulfur content of nitrogen-doped graphene, and moreover, the embodiment of the present invention, which successfully prepares load, iron oxide
The nitrogen-doped graphene of grain, iron oxide can adsorb polysulfide, inhibit the dissolution of polysulfide, to further promote lithium sulphur
The chemical property of battery.Furthermore the embodiment of the present invention is by using hydro-thermal reaction, in the nitrogen-doped graphene for having active site
Surface uniform load particle size reduces the formation of polysulfide, improves transformation efficiency in the iron oxide of 4.0~8.0nm,
And then it is greatly improved the chemical property of lithium-sulfur cell.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is graphene-ferric oxide nano composite material XPS figure in the embodiment of the present invention 1；
Fig. 2 is graphene-ferric oxide nano composite material XRD diagram in the embodiment of the present invention 1；
Fig. 3 is graphene/iron oxide/sulphur cell positive electrode material XRD diagram prepared by the embodiment of the present invention 1；
Fig. 4 is graphene/iron oxide/sulphur cell positive electrode material TEM figure prepared by the embodiment of the present invention 1；
Fig. 5 is graphene/iron oxide/sulphur cell positive electrode material CV curve graph prepared by the embodiment of the present invention 1.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
The present invention provides a kind of sulphur/iron oxide/graphene battery positive electrode, preparation method and lithium-sulfur cells, solve
In the prior art it is also easy to produce polysulfide when as lithium sulfur battery anode material in elemental sulfur and elemental sulfur cannot be effective
It is fixed, and then lead to short lithium-sulfur cell service life, electric conductivity, cyclical stability and the poor technical problem of security performance.
In order to which the present invention is described in more detail, below with reference to embodiment to a kind of sulphur/iron oxide/graphene provided by the invention
Cell positive material, preparation method and lithium-sulfur cell, are specifically described.
Embodiment 1:
It prepares nitrogen-doped graphene: measuring the three necks burning that 400ml 1.0mg/ml graphene oxide water solution is placed in 500ml
In bottle, the cyanamide aqueous solution of 16ml 50wt% is added, is stirred evenly, reacts 36h at 90 DEG C, reacts obtained product
It after natural cooling, filtered, freezed, be freeze-dried, the nitrogen-doped graphene with active site is made.
It prepares graphene-ferric oxide nano composite material: weighing the above-mentioned nitrogen-doped graphene of 75mg, be added to 480ml's
EtOH Sonicate dispersion, then take the FeCl of 0.75mmol3, it is dissolved in the dehydrated alcohol of 10ml, is added to scattered graphene
In solution, the uniform dispersion of molysite and nitrogen-doped graphene mixing is obtained, 8ml deionized water is added, dispersion liquid is shifted
Into reaction kettle, the soaking time 6h at 90 DEG C of temperature, carrying out hydro-thermal reaction will be resulting to product natural cooling after reaction
Product is filtered, is washed, is dried, and graphene-ferric oxide nano composite material is obtained.
It prepares sulphur/iron oxide/graphene battery positive electrode: weighing graphene-ferric oxide nano composite material 60mg simultaneously
It is mixed with 40mg elemental sulfur, mixture sulfur content is made to reach 40%, mixture is transferred to seal pipe, pumped inner air tube and fill
Enter inert gas, temperature is controlled at 130 DEG C, soaking time 6h, carries out vacuum fusion diffusion reaction, finally obtain sulphur/iron oxide/
Graphene battery positive electrode.
Sulphur/iron oxide/graphene battery positive electrode made from above-described embodiment 1 is tested for the property.
Fig. 1 is graphene-ferric oxide nano composite material XPS figure in embodiment 1, as can be seen from Figure 1 the content of nitrogen
That is active site content is more, in the case where iron oxide introduces still with the presence of part, it is ensured that iron ion is on active site
Dispersion load, particle size are smaller；
Fig. 2 is graphene-ferric oxide nano composite material XRD diagram in embodiment 1, as shown in Figure 2, the metal oxygen in figure
Compound particle is ferric oxide particles；
Fig. 3 is graphene/iron oxide/sulphur cell positive electrode material XRD diagram prepared by embodiment 1, and XRD is composed as can be seen from Figure 3
The peak of sulphur is shown as in figure, the content of sulphur is higher in composite material；
Fig. 4 is graphene/iron oxide/sulphur cell positive electrode material TEM figure prepared by embodiment 1, as shown in Figure 4, oxidation
Iron particle is evenly distributed in nitrogen-doped graphene surface；
Fig. 5 is graphene/iron oxide/sulphur cell positive electrode material CV curve graph prepared by embodiment 1, as can be seen from Figure 5, stone
Black alkene/iron oxide/sulphur cell positive electrode material stability in electro-chemical test is preferable.
Embodiment 2
It prepares nitrogen-doped graphene: weighing 200mg graphene oxide and be placed in the three-neck flask of 500ml, 400ml is added and goes
Ionized water adds 10mg urea, and stirring and dissolving is dispersed, 100 DEG C of reaction 30h, after reacting obtained product natural cooling, into
Row is filtered, freezing, is freeze-dried, and nitrogen-doped graphene is made.
It prepares graphene-ferric oxide nano composite material: weighing 75mg nitrogen-doped graphene, be added to the acetone of 480ml
Middle ultrasonic disperse, then take the frerrous chloride (FeCl of 3.0mmol2), it is dissolved in the dehydrated alcohol of 10ml, is added to scattered
In graphene solution, the uniform dispersion of molysite and nitrogen-doped graphene mixing is obtained, 16ml deionized water is added, will disperse
Liquid is transferred in reaction kettle, and 4h is kept the temperature at 100 DEG C of temperature, hydro-thermal reaction is carried out, to product natural cooling after reaction, by gained
Product filtered, washed, dried, obtain graphene-ferric oxide nano composite material.
Prepare sulphur/iron oxide/graphene battery positive electrode: weigh graphene-iron oxide 50mg and with 50mg elemental sulfur
Mixing, makes mixture sulfur content reach 50%, mixture is transferred to seal pipe, pump inner air tube and be filled with inert gas,
Temperature is controlled at 140 DEG C, soaking time 20h, is carried out vacuum fusion diffusion reaction, is finally obtained sulphur/iron oxide/graphene battery
Positive electrode.
Embodiment 3
Prepare nitrogen-doped graphene: the graphene oxide water solution for measuring 20ml10mg/ml is placed in the beaker of 500ml,
380ml deionized water is added, stirs evenly, adds the cyanamide of 16ml 50wt%, be transferred in three-neck flask, 90 DEG C anti-
After obtained product natural cooling reacted, it should be filtered, be freezed, be freeze-dried for 24 hours, nitrogen-doped graphene is made.
It prepares graphene-ferric oxide nano composite material: weighing 75mg nitrogen-doped graphene, be added to the ethyl alcohol of 470ml
Middle ultrasonic disperse, then take the ferric nitrate (Fe (NO of 4.5mmol3)3), it is dissolved in the dehydrated alcohol of 20ml, is added to scattered
In graphene solution, the uniform dispersion of molysite and nitrogen-doped graphene mixing is obtained, 10ml deionized water is added, will disperse
Liquid is transferred in reaction kettle, 120 DEG C of temperature, soaking time 2h, hydro-thermal reaction is carried out, to product natural cooling after reaction, by institute
The product obtained is filtered, is washed, is dried, and graphene-ferric oxide nano composite material is obtained.
Prepare sulphur/iron oxide/graphene battery positive electrode: weigh graphene-ferric oxide nano composite material 40mg with
The mixing of 60mg elemental sulfur, makes mixture sulfur content reach 60%, mixture is transferred to seal pipe, pump inner air tube and be filled with
Inert gas, temperature control at 155 DEG C, soaking time 10h, carry out vacuum fusion diffusion reaction, finally obtain sulphur/iron oxide/
Graphene battery positive electrode.
Embodiment 4
Prepare nitrogen-doped graphene: the graphene oxide water solution for measuring 20ml10mg/ml is placed in the beaker of 500ml,
380ml deionized water is added, stirs evenly, adds 10ml cyanamid dimerization, be transferred in three-neck flask, 110 DEG C of reaction 18h,
It after reacting obtained product natural cooling, filtered, freezed, be freeze-dried, nitrogen-doped graphene is made.
It prepares graphene-ferric oxide nano composite material: weighing 75mg nitrogen-doped graphene, be added to the second two of 480ml
Ultrasonic disperse in alcohol, then take the ferric sulfate (Fe of 1.5mmol2(SO4)3), it is dissolved in the dehydrated alcohol of 8ml, is added to scattered
Graphene solution in, obtain molysite and nitrogen-doped graphene mixing uniform dispersion, add 12ml deionized water, will point
Dispersion liquid is transferred in reaction kettle, 110 DEG C of temperature, soaking time 2h, carries out hydro-thermal reaction, will to product natural cooling after reaction
Resulting product is filtered, is washed, is dried, and graphene-ferric oxide nano composite material is obtained.
Prepare sulphur/iron oxide/graphene battery positive electrode: weigh graphene-ferric oxide nano composite material 30mg with
The mixing of 70mg elemental sulfur, makes mixture sulfur content reach 70%, mixture is transferred to seal pipe, pump inner air tube and be filled with
Inert gas, temperature control at 160 DEG C, soaking time 6h, carry out vacuum fusion diffusion reaction, finally obtain sulphur/iron oxide/stone
Black alkene cell positive material.
Embodiment 5
Prepare nitrogen-doped graphene: the graphene oxide for weighing 200mg is placed in the beaker of 500ml, and 400ml is added and goes
Ionized water stirs evenly, and adds 16ml 50wt% cyanamide, is transferred in three-neck flask, 110 DEG C of reaction 18h, reacts institute
It after obtained product natural cooling, filtered, freezed, be freeze-dried, nitrogen-doped graphene is made.
It prepares graphene-ferric oxide nano composite material: weighing 75mg nitrogen-doped graphene, be added to the isopropyl of 460ml
Ultrasonic disperse in alcohol, then take the FeCl of 2.25mmol3, it is dissolved in the dehydrated alcohol of 20ml, is added to scattered graphene
In solution, the uniform dispersion of molysite and nitrogen-doped graphene mixing is obtained, 20ml deionized water is added, dispersion liquid is shifted
Into reaction kettle, 120 DEG C of temperature, soaking time 1h, hydro-thermal reaction is carried out, to product natural cooling after reaction, by resulting production
Object is filtered, is washed, is dried, and graphene-ferric oxide nano composite material is obtained.
Prepare sulphur/iron oxide/graphene battery positive electrode: weigh graphene-ferric oxide nano composite material 20mg with
The mixing of 80mg elemental sulfur, makes mixture sulfur content reach 80%, mixture is transferred to seal pipe, pump inner air tube and be filled with
Inert gas, temperature control at 160 DEG C, soaking time 6h, carry out vacuum fusion diffusion reaction, finally obtain sulphur/iron oxide/stone
Black alkene cell positive material.
Embodiment 6
Prepare nitrogen-doped graphene: the graphene oxide for weighing 200mg is placed in the beaker of 500ml, and 400ml is added and goes
Ionized water stirs evenly, and adds 16ml 50wt% cyanamide, is transferred in three-neck flask, and 90 DEG C of reactions for 24 hours, react gained
It after the product natural cooling arrived, filtered, freezed, be freeze-dried, nitrogen-doped graphene is made.
It prepares sulphur/graphene battery positive electrode: weighing nitrogen-doped graphene material 30mg and mixed with 70mg elemental sulfur, made
Mixture sulfur content reaches 70%, and mixture is transferred to seal pipe, pumps inner air tube and is filled with inert gas, temperature control
At 155 DEG C, soaking time 10h, vacuum fusion diffusion reaction is carried out, sulphur/iron oxide/graphene battery anode material is finally obtained
Material.
It is observed that a large amount of Sulfur releasings are simultaneously after nitrogen-doped graphene/sulfur powder vacuum fusion diffusion reaction after mixed grinding
It is attached to sealing inside pipe wall, surveys and is substantially reduced through examination sulfur content.
Embodiment 7
It prepares graphene-ferric oxide composite material: weighing 75mg graphene, be added in the dehydrated alcohol of 460ml ultrasonic
Dispersion, then the FeCl3 of 3.0mmol is taken, it is dissolved in the dehydrated alcohol of 20ml, is added in scattered graphene solution, obtains
The uniform dispersion mixed to molysite and graphene, adds 10ml deionized water, dispersion liquid is transferred in reaction kettle, temperature
120 DEG C, soaking time 2h, hydro-thermal reaction is carried out, to product natural cooling after reaction, resulting product is filtered, is washed,
It is dry, obtain graphene-ferric oxide composite material.
It prepares sulphur/iron oxide/graphene battery positive electrode: weighing graphene-ferric oxide composite material 30mg and 70mg
Elemental sulfur mixing, makes mixture sulfur content reach 70%, mixture is transferred to seal pipe, pump inner air tube and be filled with inertia
Gas, temperature control at 155 DEG C, soaking time 10h, carry out vacuum fusion diffusion reaction, finally obtain sulphur/iron oxide/graphite
Alkene cell positive material.
It is observed that filtrate is yellow after molysite and the uniform dispersion hydro-thermal reaction of graphene mixing, filter is known after tested
Liquid contains iron ion, and iron oxide content is lower in graphene-ferric oxide composite material, and sulphur/iron oxide/grapheme material carries sulfur content
It is relatively low.
In conclusion table 1 is sulphur/iron oxide/graphene battery positive electrode results of property made from Examples 1 to 5,
It should be noted that when preparing nitrogen-doped graphene, the nitrogen-atoms being introduced into can replace the oxygen in partial oxidation of graphite alkene, nitrogen with
Key between graphene participates in the reaction of next step, therefore by the content of nitrogen in measurement nitrogen-doped graphene it can be concluded that nitrogen is mixed
The active site content of miscellaneous graphene.
Sulphur/iron oxide/graphene battery positive electrode results of property made from 1 Examples 1 to 5 of table
As shown in Table 1, the embodiment of the present invention 1~5 makes the oxidation on nitrogen-doped graphene surface by using hydro-thermal reaction
Iron particle partial size is smaller, and partial size is smaller, and surface can be bigger, it is made not only can to adsorb sulphur and polysulfide by chemical action,
And intermediate product polysulfide can be catalyzed and be converted into protosulphide, the content of high-sulfur compound in electrolyte is reduced, improves and turns
Change efficiency, to be greatly improved the chemical property of lithium-sulfur cell.In addition, the N doping in the embodiment of the present invention 1~5 is living
Property site content is higher.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of preparation method of sulphur/iron oxide/graphene battery positive electrode, which comprises the following steps:
Step 1: graphene-ferric oxide nano composite material is made by hydro-thermal reaction in nitrogen-doped graphene and iron salt solutions；
Step 2: the graphene-ferric oxide nano composite material and elemental sulfur being mixed to get mixture, by the mixture
Sulphur/iron oxide/graphene battery positive electrode is made by vacuum fusion diffusion reaction.
2. the preparation method of sulphur/iron oxide/graphene battery positive electrode according to claim 1, which is characterized in that institute
The temperature for stating hydro-thermal reaction is 90~120 DEG C.
3. the preparation method of sulphur/iron oxide/graphene battery positive electrode according to claim 1, which is characterized in that institute
The time for stating hydro-thermal reaction is 1~6h.
4. the preparation method of sulphur/iron oxide/graphene battery positive electrode according to claim 1, which is characterized in that institute
The solute for stating iron salt solutions includes one of frerrous chloride, ferric sulfate, iron chloride and ferric nitrate or a variety of.
5. the preparation method of sulphur/iron oxide/graphene battery positive electrode according to claim 4, which is characterized in that institute
The molar ratio of the solute and the nitrogen-doped graphene of stating iron salt solutions is 0.01~0.06:1mol/g.
6. the preparation method of sulphur/iron oxide/graphene battery positive electrode according to claim 1, which is characterized in that institute
The content for stating element sulphur in mixture is 40%~80%.
7. the preparation method of sulphur/iron oxide/graphene battery positive electrode according to claim 1, which is characterized in that institute
The temperature for stating vacuum fusion diffusion reaction is 130~160 DEG C.
8. the preparation method of sulphur/iron oxide/graphene battery positive electrode according to claim 1, which is characterized in that institute
The time for stating vacuum fusion diffusion reaction is 6~36h.
9. a kind of sulphur/iron oxide/graphene battery positive electrode, which is characterized in that as described in claim 1~8 any one
Sulphur/iron oxide/graphene battery positive electrode preparation method be made.
10. a kind of lithium-sulfur cell, which is characterized in that its cathode is lithium-sulfur cell negative electrode material, and anode includes claim 9 institute
Sulphur/iron oxide/graphene battery the positive electrode stated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811002702.8A CN109148861A (en) | 2018-08-30 | 2018-08-30 | Sulphur/iron oxide/graphene battery positive electrode, preparation method and lithium-sulfur cell |
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| CN201811002702.8A CN109148861A (en) | 2018-08-30 | 2018-08-30 | Sulphur/iron oxide/graphene battery positive electrode, preparation method and lithium-sulfur cell |
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