CN106129386A - A kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole and preparation method - Google Patents
A kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole and preparation method Download PDFInfo
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Abstract
The invention discloses a kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole and preparation method.First being mixed with KOH by Bombyx mori L. and be placed in high temperature process furnances, reacting by heating obtains micropore Bombyx mori L. SPCM under a shielding gas；It is subsequently poured into sulfur powder to be allowed to directly not contact with SPCM；Put into drying baker after evacuation, sealing, take out after temperature reaction, obtain SPCM/S1Composite；It is placed in hypo solution standing again, then drips hydrochloric acid solution and carry out chemical deposition secondary and carry reaction of Salmon-Saxl 2～5h, after centrifugal filtration, obtain SPCM/S composite in drying；Again it is obtained G SPCM/S composite sulfur positive pole with graphene oxide cladding by microwave radiation reduction.The present invention uses vacuum and steam method, chemical solution deposition to load sulfur, is remarkably improved sulfur adsorption and uniform dispersion on carrier, after graphene coated, can improve again battery cycle life.
Description
Technical field
The invention belongs to materials chemistry and technical field of electrochemistry, be specifically related to porous carbon material and lithium-sulfur cell material thereof
And preparation method thereof.
Background technology
Excessively exploitation and a large amount of consumption of fossil energy have caused increasingly serious global energy crisis and environmental problem, sternly
The living environment of the mankind and socioeconomic sustainable development are heavily threatened.Therefore, accelerate that particularly clean new forms of energy can be again
The development and utilization of the raw energy is human society in the top priority of the facing of new century and severe challenge.Circulation can use
Secondary cell is the excellent energy storage device of various regenerative resource (such as solar energy, wind energy, tide energy etc.), is that following cleaning can be again
The raw indispensable important composition of the energy, has great social need.
In recent years, lithium-sulfur cell receives much concern as the lithium secondary battery of a new generation's high-energy-density.Its theory compares energy
Amount may be up to 2600Wh/kg, exceeds 6-7 times than lithium ion battery energy density, sustainable kart continuation of the journey 500-
More than 800km, thus receive much concern, and be considered as one of the most promising energy-storage battery system in future.
In lithium-sulfur cell, the performance of sulfur positive electrode is the key determining lithium-sulfur cell quality height.But, it is limited to sulfur
And the electric conductivity that discharging product lithium sulfide is poor, and produce in the middle of a series of many lithium sulfides formed in charge and discharge process
Thing is soluble in the shortcomings such as organic electrolyte, and it is relatively low (particularly under high current density that lithium-sulfur cell still suffers from sulfur positive pole utilization rate
Discharge and recharge) and cycle performance difference etc. problem, become hinder the actual application of lithium-sulfur cell maximum bottleneck.
If can sulfur be homogeneously dispersed among the porous material that a kind of electric conductivity is good with small particle size form, a side
Face can be effectively improved the utilization rate of sulfur；On the other hand, the surface adsorption effect utilizing conductive carrier can effectively suppress again
Sulfur and the discharging product (many lithium sulfides) loss on anode pole piece thereof.Therefore, height can be prepared by compound to sulfur and material with carbon element
Capacity and the anode composite material of lithium sulfur battery of cycle performance excellence.Bombyx mori L. is the main garbage of Bombyxmori Linnaeus industry, at rural area warp
Chang Suiyi abandons and causes environmental pollution, understands it from Electron microscope observation and has natural three-dimensional drape structure and phosphorus content height,
High-ratio surface multiporous biological charcoal can be obtained through high temperature cabonization and activation.
At present, people's many employings one step melts diffusion method and the injection of sulfur component is carried formation lithium sulfur positive pole composite wood in sulfur materials
Material.There is following problem in this method: (1) sulfur is the best with the wellability of porous material hole wall in the molten state, it tends to be difficult to
Go deep into inside duct particularly in micropore hole, and block duct；(2) sulfur component is relatively low with porous material hole wall adhesion, dispersion
Uneven.These two aspects have impact on the high rate performance that composite is overall to a great extent, is easily caused composite simultaneously
Middle utilization efficiency is the highest, and the discharge capacity of battery reduces；In addition sulfur component is difficult to diffuse into micropore canals, reduces it and carries sulfur
The adsorption of material, the polysulfide causing reaction to generate is easier to be dissolved in organic electrolyte, accelerates lithium-sulfur cell
Capacity attenuation speed.
Summary of the invention
The present invention is directed to existing porous material carry that sulfur is uneven and absorption affinity is weak and cause composite cycle performance difference etc.
Problem, it is provided that a kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole and preparation method thereof, utilizes gas phase steam absorption-change
Sulfur component is supported in the duct of micropore Bombyx mori L. by the process learning solution deposition with nano particle size, is then coated with oxygen by solwution method
Functionalized graphene sheet, then by microwave irradiation, graphene oxide sheet is reduced into Graphene, it is thus achieved that long-life carbon sulfur is compound just
Pole material.
The purpose of the present invention is achieved through the following technical solutions:
A kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole, the porous carrier of this material have typical micropore (<
2nm) duct, its micropore has strong adsorption to sulfur molecule；The BET specific surface area of obtained SPCM material exists
1150m2/ more than g, micropore average pore size existsAfter graphene film is coated with, the cycle performance of material has had substantially
Promote.Obtained SPCM/S composite is up to 990-1020mAh/g at 1.0C discharge capacity, and circulates under 1.0C
Specific discharge capacity after 200 circles is up to more than 880mAh/g, and capability retention is up to more than 90%.
The preparation method of the graphene coated micropore Bombyx mori L. sulfur composite positive pole of the present invention, comprises the steps,
(1) preparation of micropore Bombyx mori L.: mixed with KOH powder by Bombyx mori L., is placed in high temperature process furnances, logical protective gas purging
After, it is heated to 500-800 DEG C and carries out reaction and obtain micropore Bombyx mori L.；It is designated as SPCM.
(2) micropore Bombyx mori L. uploads sulfur: first put in quartz ampoule by micropore Bombyx mori L. powder, then pours sulfur powder into and enter in quartz ampoule,
Directly do not contact with micropore Bombyx mori L. charcoal；Putting into drying baker after evacuation, sealing, be warming up to 120～160 DEG C, then constant temperature keeps 8
～after 20h, taking-up naturally cools to room temperature, obtains SPCM/S1Composite.
(3) secondary carries sulfur: by SPCM/S1Composite is placed in hypo solution standing, then drips hydrochloric acid solution
Carry out chemical deposition secondary and carry reaction of Salmon-Saxl 2～5h, after centrifugal filtration, obtain graphene coated micropore Bombyx mori L. sulfur in drying compound just
Pole material, is designated as SPCM/S composite.
(4) graphene coated process: SPCM/S composite is placed in the aqueous solution of graphene oxide, SPCM/S and oxygen
Sample, after 5-19:1, stirring certain time, is taken out and is placed in microwave reactor heating by the mass ratio of functionalized graphene, microwave
Reaction temperature controls at 100-150 DEG C, and the response time is 5-15min, obtains graphene coated micropore Bombyx mori L. sulfur anode composite material
Material, is designated as: G-SPCM/S.
Further preferred as scheme, in described step (1), the high temperature cabonization response time is 0.5～5h, protectiveness gas
Body can use the noble gases such as nitrogen, argon；The mass ratio of KOH and Bombyx mori L. is (1～6): 1.
Further preferred as scheme, controls vacuum≤100Pa in quartz ampoule in described step (2)., drying baker is adopted
With can temperature programmed control drying baker, concrete temperature control process:
(a) temperature-rise period: rise to 120～160 DEG C from room temperature with the heating rate of 0.5～2.0 DEG C/min；
(b) thermostatic process: be placed in 120～160 DEG C and keep 10～15h；
(c) temperature-fall period: thermostatic process takes out after terminating immediately in drying baker, naturally cools to room temperature.
Further preferred as scheme, hypo solution and SPCM/S in described step (3)1The matter of composite
Amount ratio is 4～10:1, and time of repose is 5～10h.
Further preferred as scheme, in described step (3), hydrochloric acid is 3～11:1 with the mol ratio of sodium thiosulfate,
The concentration that can use sodium thiosulfate is 0.03～0.20mol/L, and concentration of hydrochloric acid is 3～10wt%.
Further preferred as scheme, in described step (4), microwave reaction temperature controls at 100-150 DEG C, during reaction
Between be 5-15min.
The principle of the present invention: make gaseous sulfur Molecular Adsorption micropore Bombyx mori L. by vapor sorption mode the most under vacuum conditions
On the strongest adsorption site of material, the micropore canals of micropore Bombyx mori L. is formed sulfur microcrystals, obtains micropore Bombyx mori L. sulfur SPCM/S1
Composite.Recycling chemical solution deposition is by SPCM/S1Composite is placed in Na2S2O3In solution, it is slowly added dropwise hydrochloric acid molten
Liquid, makes sulfur slowly separate out on micropore Bombyx mori L. existing sulfur nucleus, forms sulfur Load Balanced and the strong micropore Bombyx mori L. sulfur of absorption affinity
Composite.Outer layer is wrapped up in deposited Graphene again, the outflow of sulfur component can be significantly inhibited, thus promote the high rate capability of composite
With long-acting cycle performance.
The graphene coated micropore Bombyx mori L. sulfur composite positive pole of the present invention circulates the electric discharge specific volume after 220 circles under 1.0C
Amount up to 880-920mAh/g, capability retention is up to more than 90%, hence it is evident that higher than directly melted diffusion load sulfur gained without
The charcoal sulfur composite positive pole of cladding, is also 2～3 times of conventional lithium-ion battery material specific capacity.
Compared with prior art, the present invention is advantageous in that:
(1) carrier used in the present invention is micropore Bombyx mori L., belongs to twice laid, wide material sources and with low cost, reaming
One-step method completes, and process is simple and environmental protection.
(2) structure utilizing the fold that Bombyx mori L. itself has is carbon source, can form the micro-of three-dimensional network intercommunication by reaming
Hole surface is conducive to improving absorption affinity to sulfur, and mesopore then can provide transfer passage for lithium ion and electrolyte, reduce lithium from
Son and the diffusional resistance of electrolyte.
(3) present invention uses vapor diffusion active sulfur component to be carried on equably in the duct of SPCM, can make
Sulfur component occupies the strongest adsorption site and forms little S crystal seed, more just can be supported on by force by more S by chemical solution deposition
Adsorption potential, this one side can be effectively improved the contact area of sulfur component and the adhesive force of carrier and sulfur component and conduction hole wall,
On the other hand also can be prevented effectively from melted diffusion method brings duct blocking linear, and then improves the utilization ratio of sulfur, energy simultaneously
Obtain the cycle performance of long-acting circulation.
(4) the graphene coated micropore Bombyx mori L. sulfur composite positive pole of the present invention, the Graphene shell of its outer layer can be effective
Stop the excessive of sulfur component, make battery have higher high rate performance and excellent cycle performance, present good industrialization
Application prospect.
(5) preparation method of the present invention is simple to operation, is suitable for large-scale industrial production.
Accompanying drawing explanation
Fig. 1 is the SEM of Bombyx mori L.；
Fig. 2 is the SEM figure of micropore Bombyx mori L.；
Fig. 3 is the SEM figure of graphene coated micropore Bombyx mori L. sulfur composite positive pole embodiment 1；
Fig. 4 is the thermal gravimetric analysis curve figure of the embodiment of the present invention 1 and SPCM/S composite；
After Fig. 5 embodiment of the present invention 1 activates 4 circles under 0.2C (336mA/g), the circulation under 1.0C (1680mA/g) multiplying power
Performance map.
Detailed description of the invention
The present invention will be further described with embodiment below in conjunction with the accompanying drawings, but the scope of protection of present invention is not
It is confined to the scope of embodiment statement.
Embodiment 1
The preparation method of a kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole, comprises the steps,
(1) preparation of micropore Bombyx mori L.
At N210.0g Faeces bombycis and 10.0g KOH powder are raised to 800 DEG C with the heating rate of 2 DEG C/min by atmosphere, and
Cool to room temperature after keeping 0.5h at 800 DEG C, obtain micropore Bombyx mori L., be designated as SPCM.
(2) vacuum-steam method uploads sulfur at micropore Bombyx mori L.
First 0.3g SPCM powder is laid in Noah's ark, and Noah's ark is slowly pushed the middle part of quartz ampoule.1g sulfur powder is fallen
Enter in quartz ampoule, directly do not contact with carbonization SPCM；Putting it into after evacuation (vacuum is at≤100Pa), sealing can program
In the drying baker of temperature control, being warming up to 120 DEG C according to the heating rate of 0.5 DEG C/min, constant temperature takes out natural cooling after keeping 8h
To room temperature, obtain SPCM/S1Composite.
(3) chemical solution deposition is at SPCM/S1On composite, secondary carries sulfur
By 0.1g SPCM/S1Composite is placed in the hypo solution of 100mL standing 5h, sodium thiosulfate
Concentration is at 0.03mol/L；Then the hydrochloric acid solution 12mL being slowly added dropwise concentration 3wt% fully reacts 2h；After centrifugal filtration, 80
Dry for standby at DEG C, sample is labeled as SPCM/S composite.
(4) graphene coated process: be placed in by 0.57g SPCM/S composite containing 100mg graphene oxide is water-soluble
In liquid, after stirring certain 2h time, being taken out by sample and be placed in microwave reactor heating, the reaction temperature of microwave controls 100
DEG C, the response time is 15min, obtains graphene coated micropore Bombyx mori L. sulfur composite positive pole.
Embodiment 2
The preparation method of a kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole, comprises the steps,
(1) preparation of micropore Bombyx mori L.
At N210.0g Faeces bombycis and 30.0g KOH powder are raised to 700 DEG C with the heating rate of 5 DEG C/min by atmosphere, and
Cool to room temperature after keeping 1.0h at 700 DEG C, obtain micropore Bombyx mori L., be designated as SPCM.
(2) vacuum-steam method uploads sulfur at micropore Bombyx mori L.
First 1.0g micropore Bombyx mori L. SPCM powder is laid in Noah's ark, and Noah's ark is slowly pushed the middle part of quartz ampoule.Will
The sulfur powder of 2g is poured in quartz ampoule, does not directly contact with micropore Bombyx mori L. SPCM；After evacuation (vacuum is at≤100Pa), sealing
Putting it into and can be warming up to 140 DEG C according to the heating rate of 1.0 DEG C/min in the drying baker of temperature programmed control, constant temperature keeps 14h
Rear taking-up naturally cools to room temperature, obtains SPCM/S1Composite.
(3) chemical solution deposition is at SPCM/S1On composite, secondary carries sulfur
By 0.6g SPCM/S1Composite is placed in the hypo solution of 200mL standing 7h, sodium thiosulfate
Concentration is at 0.12mol/L；Then the hydrochloric acid solution 120mL being slowly added dropwise concentration 6wt% fully reacts 4h；After centrifugal filtration,
Dry for standby at 80 DEG C, sample is labeled as SPCM/S composite.
(4) graphene coated process: be placed in by 1.0g SPCM/S composite containing 100mg graphene oxide is water-soluble
In liquid, after stirring certain 3h time, being taken out by sample and be placed in microwave reactor heating, the reaction temperature of microwave controls 110
DEG C, the response time is 12min, obtains graphene coated micropore Bombyx mori L. sulfur composite positive pole.
Embodiment 3
The preparation method of a kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole, comprises the steps,
(1) preparation of micropore Bombyx mori L.
At N210.0g Faeces bombycis and 40.0g KOH powder are raised to 600 DEG C with the heating rate of 3 DEG C/min by atmosphere, and
Cool to room temperature after keeping 2.0h at 600 DEG C, obtain micropore Bombyx mori L., be designated as SPCM.
(2) vacuum-steam method uploads sulfur at micropore Bombyx mori L.
First 2.0g micropore Bombyx mori L. SPCM powder is laid in Noah's ark, and Noah's ark is slowly pushed the middle part of quartz ampoule.Will
A certain amount of sulfur powder is poured in quartz ampoule, does not directly contact with micropore Bombyx mori L. SPCM；Evacuation (vacuum is at≤100Pa), close
Being honored as a queen and put it into and can be warming up to 160 DEG C according to the heating rate of 2.0 DEG C/min in the drying baker of temperature programmed control, constant temperature is protected
Take out after holding 20h and naturally cool to room temperature, obtain SPCM/S1Composite.
(3) chemical solution deposition is at SPCM/S1On composite, secondary carries sulfur
By 1.0g SPCM/S1Composite is placed in the hypo solution of 300mL standing 10h, sodium thiosulfate
Concentration is at 0.20M；Then the hydrochloric acid solution 240mL being slowly added dropwise concentration 10wt% fully reacts 5h；After centrifugal filtration, at 80 DEG C
Lower dry for standby, sample is labeled as SPCM/S composite.
(4) graphene coated process: be placed in by 1.5g SPCM/S composite containing 100mg graphene oxide is water-soluble
In liquid, after stirring certain 1h time, being taken out by sample and be placed in microwave reactor heating, the reaction temperature of microwave controls 150
DEG C, the response time is 5min, obtains graphene coated micropore Bombyx mori L. sulfur composite positive pole.
Embodiment 4
The preparation method of a kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole, comprises the steps,
(1) preparation of micropore Bombyx mori L. SPCM
At N210.0g Faeces bombycis and 50.0g KOH powder are raised to 500 DEG C with the heating rate of 6 DEG C/min by atmosphere, and
Cool to room temperature after keeping 3.0h at 500 DEG C, obtain micropore Bombyx mori L. SPCM.
(2) vacuum-steam method uploads sulfur at micropore Bombyx mori L.
First 0.6g micropore Bombyx mori L. SPCM powder is laid in Noah's ark, and Noah's ark is slowly pushed the middle part of quartz ampoule.Will
A certain amount of sulfur powder is poured in quartz ampoule, does not directly contact with micropore Bombyx mori L. SPCM；Evacuation (vacuum is at≤100Pa), close
Being honored as a queen and put it into and can be warming up to 130 DEG C according to the heating rate of 1.0 DEG C/min in the drying baker of temperature programmed control, constant temperature is protected
Take out after holding 10h and naturally cool to room temperature, obtain SPCM/S1Composite.
(3) chemical solution deposition is at SPCM/S1On composite, secondary carries sulfur
By 0.3g SPCM/S1Composite is placed in the hypo solution of 150mL standing 6h, sodium thiosulfate
Concentration is at 0.07M；Then the hydrochloric acid solution 60mL being slowly added dropwise concentration 4wt% fully reacts 3h；After centrifugal filtration, at 80 DEG C
Dry for standby, sample is labeled as SPCM/S composite.
(4) graphene coated process: be placed in by 1.8g SPCM/S composite containing 100mg graphene oxide is water-soluble
In liquid, after stirring certain 1h time, being taken out by sample and be placed in microwave reactor heating, the reaction temperature of microwave controls 130
DEG C, the response time is 10min, obtains graphene coated micropore Bombyx mori L. sulfur composite positive pole.
Embodiment 5
The preparation method of a kind of graphene coated micropore Bombyx mori L. sulfur composite positive pole, comprises the steps,
(1) preparation of micropore Bombyx mori L. SPCM
At N210.0g Faeces bombycis and 60.0g KOH powder are raised to 700 DEG C with the heating rate of 4 DEG C/min by atmosphere, and
Cool to room temperature after keeping 5.0h at 700 DEG C, obtain micropore Bombyx mori L. SPCM.
(2) vacuum-steam method uploads sulfur at micropore Bombyx mori L. SPCM
First 1.5g micropore Bombyx mori L. SPCM powder is laid in Noah's ark, and Noah's ark is slowly pushed the middle part of quartz ampoule.Will
A certain amount of sulfur powder is poured in quartz ampoule, does not directly contact with micropore Bombyx mori L. SPCM；Evacuation (vacuum is at≤100Pa), close
Being honored as a queen and put it into and can be warming up to 150 DEG C according to the heating rate of 2.0 DEG C/min in the drying baker of temperature programmed control, constant temperature is protected
Take out after holding 18h and naturally cool to room temperature, obtain SPCM/S1Composite.
(3) chemical solution deposition is at SPCM/S1On composite, secondary carries sulfur
By 0.8g SPCM/S1Composite is placed in the hypo solution of 250mL standing 9h, sodium thiosulfate
Concentration is at 0.18M；Then the hydrochloric acid solution 190mL being slowly added dropwise concentration 9wt% fully reacts 4h；After centrifugal filtration, at 80 DEG C
Lower dry for standby, sample is labeled as SPCM/S composite.
(4) graphene coated process: be placed in by 1.9g SPCM/S composite containing 100mg graphene oxide is water-soluble
In liquid, after stirring certain 3h time, being taken out by sample and be placed in microwave reactor heating, the reaction temperature of microwave controls 120
DEG C, the response time is 5min, obtains graphene coated micropore Bombyx mori L. sulfur composite positive pole.
Material properties test:
(1) surface topography of G-SPCM/S composite
Embodiment 1, micropore Bombyx mori L. and the Bombyx mori L. the present invention prepared carry out electron-microscope scanning, obtain the SEM figure of Fig. 1～Fig. 3.
Fig. 1 is the SEM photograph of Faeces bombycis, and Fig. 2 is the SEM photograph of micropore Bombyx mori L. SPCM, and Fig. 3 is the enforcement that the present invention prepares
The SEM photograph of example 1.
Comparison diagram 1 with in Fig. 2 it can be seen that compared with Faeces bombycis, micropore Bombyx mori L. wrinkled surface fades away, and occurs in that non-
Often abundant duct and channel design, channel interior is also may be seen indistinctly the most tiny duct, presents netted point of 3 D pore canal
Cloth general layout.This structure is advantageous to the load of S.Fig. 3 surface is substantially coated with one layer of lamellar material, is graphene coated
Rear produced structure.
(2) micropore Bombyx mori L., the pore structure parameter of SPCM/S and G-SPCM/S composite
Use ASAP-2020 specific surface pore-size distribution instrument that U.S. Micro company produces to micropore Bombyx mori L., SPCM/S and
The pore structure of G-SPCM/S characterizes, and result is as shown in table 1.
Table 1 micropore Bombyx mori L., the pore structure parameter of SPCM/S and G-SPCM/S
As can be seen from Table 1, micropore Bombyx mori L. SPCM has higher specific surface area, its Langmuir and BET specific surface area
It is respectively 1189.8 and 1266.9m2/ g, total pore volume is 0.56cm3/g.This illustrates after high-temperature activation reacts, Faeces bombycis duct
Interior oxy radical and some tar components are removed, and activator KOH will etch micropore canals on Bombyx mori L. internal channel simultaneously
Structure.The microcellular structure of this material can form stronger adsorption to sulfur and polysulfide, is favorably improved sulfur and is combined
The cyclical stability of material, the passage of suppression sulfur component, improves the cycle performance of battery.
After carrying sulfur by steaming process and further chemical solution deposition, the specific surface area of SPCM/S significantly declines,
Langmuir specific surface area only remains 189m2/g；Its pore volume the most significantly declines, the 26% of only SPC pore volume；By Graphene bag
Coated with rear, the Langmuir specific surface area of material is all declined slightly, and maintains 125-139m2/g。
(3) thermogravimetric curve of G-SPCM/S composite
The STA449C structural synthesis thermal analyzer using NETZSCH company of Germany to produce is multiple to the SPC/S prepared by the present invention
Condensation material carries out heat stability testing, and test condition is: nitrogen protect, heating rate is 10 DEG C/min, temperature elevating range be 100～
420℃.Test result is as shown in Figure 4.
From fig. 4, it can be seen that embodiment 1 prepared by the present invention starts weightlessness to occur, to weight when 368 DEG C at 265 DEG C
No longer changing, weightlessness terminates, and its weight-loss ratio is about 63%.Weight-loss ratio corresponds to the sulfur content of composite, and i.e. this is combined
The sulfur content of material is about 63.0%.Contrast material SCPH/S, the temperature that sulfur overflows after graphene coated has raised.By
This is visible, and preparation method of the present invention is conducive to obtaining the composite positive pole of high sulfur content, the evaporating temperature of S simultaneously
Higher explanation S is stronger with the adsorption of micropore Bombyx mori L..
(4) chemical property of G-SPCM/S composite
After Fig. 5 shows that the embodiment of the present invention one G-SPCM/S composite activates 4 circles under 0.2C (334mA/g),
Cycle performance figure under 1.0C (1680mA/g) multiplying power.As it can be seen, after material circulates 200 circles under 1.0C, its specific volume that discharges
Amount is still up to 883mAh/g, and its capability retention is up to 91%.This explanation, G-SPCM/S composite is equal in the condition tested
Having higher coulombic efficiency, this also illustrates that S is more tight with the combination of carrier micropore Bombyx mori L., and micropore Bombyx mori L. also shows simultaneously
The most excellent electric conductivity.
Table 2 showing, the electric discharge under different multiplying of the five kinds of embodiment gained G-SPCM/S composites of the present invention is held
Amount.As seen from the table, the G-SPCM/S composite high rate performance obtained by scope of experiment involved in the present invention is the most relatively
For excellence.Battery specific discharge capacity under 3.0 and 6.0C is up to 784-833 and 635-692mAh/g respectively；As can be seen here, material
Material cyclo-stationary of material in tested multiplying power change procedure, has higher specific discharge capacity under high magnification.This with
The big passage of sulfur-donor micropore Bombyx mori L. is relevant with the quickly conduction of electronics to lithium ion, and the outer Graphene wrapped up in just improves in addition
The electric conductivity that pole material is overall, and then improve the high rate performance of material.
The 2 five kinds of embodiment gained G-SPCM/S composites of table discharge capacity under different multiplying
Claims (10)
1. a graphene coated micropore Bombyx mori L. sulfur composite positive pole, it is characterised in that: this material is at 1.0C discharge capacity
Up to 990-1020mAh/g, and under 1.0C, circulate the specific discharge capacity after 200 circles be up to more than 880mAh/g, capacity keeps
Rate is up to more than 90%.
2. the preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole as claimed in claim 1, it is characterised in that
Comprise the steps,
(1) preparation of micropore Bombyx mori L.: mixed with KOH powder by Bombyx mori L., is placed in high temperature process furnances, after logical protective gas purging,
Reacting by heating obtains micropore Bombyx mori L. SPCM；
(2) micropore Bombyx mori L. uploads sulfur: first put in quartz ampoule by micropore Bombyx mori L., then pours sulfur powder into and enter in quartz ampoule, not with micropore
Bombyx mori L. directly contacts；Putting into drying baker after evacuation, sealing, be warming up to 120～160 DEG C, then constant temperature takes after keeping 8～20h
Go out to naturally cool to room temperature, obtain SPCM/S1Composite；
(3) secondary carries sulfur: by SPCM/S1Composite is placed in hypo solution, stands, then drips hydrochloric acid solution
Learn deposition secondary and carry reaction of Salmon-Saxl 2～5h, after centrifugal filtration, dry and obtain micropore Bombyx mori L. composite sulfur positive electrode SPCM/S；
(4) graphene coated process: SPCM/S composite is placed in the aqueous solution of graphene oxide, SPCM/S and oxidation stone
The mass ratio of ink alkene, after 5-19:1, stirring mixing, is placed in reacting by heating in microwave reactor, obtains graphene coated micropore silkworm
Husky sulfur composite positive pole G-SPCM/S.
The preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole the most according to claim 2, its feature exists
In: in described step (1), range of reaction temperature is 500-800 DEG C, and the response time is 0.5-5h.
The preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole the most according to claim 2, its feature exists
In: in described step (1), the mass ratio of KOH and Bombyx mori L. is 1～6:1.
The preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole the most according to claim 2, its feature exists
In: vacuum≤100Pa in quartz ampoule in described step (2).
The preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole the most according to claim 2, its feature exists
In: in described step (2) drying baker use can temperature programmed control drying baker, concrete temperature control process:
(a) temperature-rise period: rise to 120～160 DEG C from room temperature with the heating rate of 0.5～2.0 DEG C/min；
(b) thermostatic process: be placed in 120～160 DEG C and keep 10～15h；
(c) temperature-fall period: thermostatic process takes out after terminating immediately in drying baker, naturally cools to room temperature.
The preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole the most according to claim 2, its feature exists
In: hypo solution and SPCM/S in described step (3)1The mass ratio of composite is 4～10:1.
The preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole the most according to claim 2, its feature exists
In: in described step (3), hydrochloric acid is 3～11:1 with the mol ratio of sodium thiosulfate.
The preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole the most according to claim 2, its feature exists
In: in described step (3), the concentration of sodium thiosulfate is 0.03～0.20mol/L, in described step (3) concentration of hydrochloric acid be 3～
10wt%.
The preparation method of graphene coated micropore Bombyx mori L. sulfur composite positive pole the most according to claim 2, its feature exists
In: in described step (4), microwave reaction temperature controls at 100-150 DEG C, and the response time is 5-15min.
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