CN102142540A - Lithium ion battery electrode made of graphene/SnS2 composite nanometer material and preparation method thereof - Google Patents
Lithium ion battery electrode made of graphene/SnS2 composite nanometer material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a lithium ion battery electrode made of a graphene/SnS2 composite nanometer material and a preparation method thereof. The lithium ion battery electrode is characterized in that the active substance of the electrode is the graphene/SnS2 composite nanometer material, and the other components of the electrode are acetylene black and polyvinylidene fluoride. The lithium ion battery electrode comprises the following components in percentage by weight: 75-85% of the composite nanometer material active substance, 5-10% of the acetylene black and 10% of the polyvinylidene fluoride; and the mass ratio of the graphene to SnS2 nanometer material in the composite nanometer material active substance is (1:1)-(4:1). The electrode preparation method disclosed by the invention comprises the following steps: preparing a graphite oxide nanometer sheet by taking graphite as a raw material by virtue of a chemical oxidation method; in the presence of the graphite oxide nanometer sheet, synthetizing to obtain the graphene/SnS2 composite nanometer material by virtue of a one-step hydrothermal in-situ reduction method; and finally, taking the graphene/SnS2 composite nanometer material as the active substance to prepare the electrode. The electrode disclosed by the invention has the advantages of higher electrochemical lithium storage capacity and excellent cyclical stability and can be widely used in the new generation of lithium ion batteries.
Description
Technical field
The present invention relates to lithium ion cell electrode and preparation method thereof, relate in particular to Graphene/SnS
2Composite nano materials is the high power capacity of active material preparation and the lithium ion cell electrode of stable cycle performance, belongs to mechanism of new electrochemical power sources and preparing technical field thereof.
Background technology
Lithium ion battery has excellent properties such as specific energy height, memory-less effect, environmental friendliness, has been widely used in portable movable electrical appliances such as mobile phone and notebook computer.As electrokinetic cell, lithium ion battery also is with a wide range of applications on electric bicycle and electric automobile.The negative material of lithium ion battery mainly adopts graphite material (as: graphite microballoon, natural modified graphite and Delanium etc.) at present, and these graphite materials have stable circulation performance preferably, but its capacity is lower, and the theoretical capacity of graphite is 372mAh/g.A new generation's lithium ion battery is had higher requirement to the capacity and the stable circulation performance of electrode material, not only requires negative material to have high electrochemistry capacitance, and has good stable circulation performance.
Graphene nanometer sheet has the performances such as physics, chemistry and mechanics of numerous uniquenesses with its unique two-dimensional nano chip architecture, has important scientific research meaning and application prospects.The finder of grapheme material obtains the Nobel Prize in 2010 and has excited the very big interest of people to grapheme material research especially.Graphene nanometer sheet has high specific area, high conduction and heat conductivility, superpower mechanical property.Recently people have carried out research widely to graphene nanometer sheet as the application of the electrode material of micro-nano electronic device, new forms of energy battery, kollag and novel catalyst carrier.
SnS
2Have layered crystal structure, it forms octahedral coordination by two-layer compact arranged S atom and the sandwich sandwich structure that constitutes of Sn cation, the layer with layer between combine with weak Van der Waals force.SnS
2Has good electrochemistry seasoning lithium performance as lithium ion battery negative material.SnS
2Electrochemistry embedding lithium theoretical capacity be 645mAh/g, so the theoretical capacity of big graphite 372mAh/g.Therefore, SnS
2Can be used as a kind of potential lithium ion battery negative material of alternative graphite material.[Momma T, ShiraishiN, Yoshizawa A, et al., SnS such as Momma
2Anode for rechargeable lithium battery.Journal of PowerSources, 2001,97-98:198～200] use SnCl
4The SnS synthetic with the thioacetamide method
2Product is after 400 ℃ of processing, and its electrochemistry storage lithium reversible capacity reaches 600mAh/g, but after circulation 25 times, capacity is less than 400mAh/g.Therefore, its cycle performance is still waiting further improvement.[Seo JW, Jang JT, Park SW, et al., Two-Dimensional SnS such as Seo JW
2Nanoplates with Extraordinary HighDischarge Capacity for Lithium Ion Batteries.Advanced Materials.2008,20 (22): 4269～4273] by SnS has been synthesized in the thermal decomposition of organic Sn presoma
2Nanocrystal, the result shows SnS
2The electrochemistry storage lithium capacity of nanocrystal can reach more than the 600mAh/g, and has good stable circulation performance, has shown SnS
2Nanocrystal has a good application prospect as lithium ion battery negative material.
Because graphene nanometer sheet and SnS
2It all is the electrode material of very promising new forms of energy battery.If graphene nanometer sheet and SnS
2The corresponding composite nano materials of the compound preparation of nano material, the high conduction performance of graphene nanometer sheet can further improve the electric conductivity of composite material, help the electron transport in electrochemical electrode reaction and the catalytic reaction process, the chemical property of reinforced composite electrode.Graphene nanometer sheet and SnS in addition
2Compound, because the big ∏ key and the SnS of graphene nanometer sheet
2The interaction of surface electronic structure can form the electronic structure between a kind of new different material.This graphene nanometer sheet and SnS
2Composite nano materials has the performance of using widely and strengthening as the new forms of energy electrode material.But with graphene nanometer sheet and SnS
2Composite nano materials yet there are no report as the research that active material prepares lithium ion cell electrode.
The application of biological micromolecule in nano material is synthetic recently obtained people's extensive concern.The L-cysteine contains a plurality of functional group (as: NH
2,-COOH and-SH), these functional groups can provide coordination atom and metal cation to form coordinate bond.The L-cysteine has obtained application in synthetic transient metal sulfide nano material.Document [Zhang B, Ye XC, Hou WY, Zhao Y, Xie Y.Biomolecule-assistedsynthesis and electrochemical hydrogen storage of Bi
2S
3Flowerlike patterns withwell-aligned nanorods.Journal of Physical Chemistry B, 2006,110 (18) 8978～8985] synthesized the Bi of floriform appearance with the L-cysteine
2S
3Nano structural material.But up to the present, come synthesizing graphite alkene and SnS with the L-cysteine
2Composite nano materials, and with Graphene and SnS
2Composite nano materials as active material prepare lithium ion cell electrode research yet there are no publicly report.
Summary of the invention
The object of the present invention is to provide a kind of Graphene/SnS
2Lithium ion cell electrode of composite nano materials and preparation method thereof, the active material that it is characterized in that this electrode is Graphene and SnS
2Composite nano materials, all the other are acetylene black and Kynoar, the mass percentage content of each component is: nano composite material active material 75-85%, acetylene black 5-10%, Kynoar 10%, wherein, Graphene and SnS in the nano composite material active material
2The ratio of amount is 1 between the nano material: 1-4: 1.
Graphene/SnS of the present invention
2The lithium ion cell electrode of composite nano materials is characterized in that the preparation method may further comprise the steps:
1) preparation of graphite oxide nanometer sheet: under 0 ℃ of ice bath, the 0.015-0.072g graphite powder is distributed in the 20-25mL concentrated sulfuric acid, stirs adding KMnO down
4, institute adds KMnO
4Quality be graphite 3-4 doubly, stirred 30-60 minute, temperature rises to about 30-35 ℃, adds the 40-50ml deionized water, stirs the H of adding 10-15ml mass concentration 30% 20-30 minute
2O
2, stirred 5-20 minute, through centrifugation, with obtaining the graphite oxide nanometer sheet behind mass concentration 5%HCl solution, deionized water and the acetone cyclic washing;
2) the L-cysteine is dissolved in the deionized water, adds butter of tin (SnCl then
45H
2O) and fully stir and make its dissolving, the mol ratio of L-cysteine and butter of tin was at 6: 1～12: 1 in the solution, again will be by the 1st) preparation-obtained graphite oxide nanometer sheet of step adds in this solution, the 1st) used graphite raw material amount of step is 1: 1～4: 1 with the ratio of the amount of butter of tin, sonicated 1-2h, the graphite oxide nanometer sheet is well dispersed in the hydro-thermal reaction solution, this mixture is changed in the hydrothermal reaction kettle of inner liner polytetrafluoroethylene and seal, at 180-200 ℃ of reaction 20-36h, the product centrifugation that obtains, and with deionized water and absolute ethanol washing, drying obtains Graphene and SnS
2Composite nano materials;
3) with Graphene and SnS
2Composite nano materials as the active material of electrode, under agitation fully mix the uniform pastel of furnishing with the N-methyl pyrrolidone solution of the Kynoar of acetylene black and mass concentration 5%, each constituent mass percentage is: nano composite material active material 75-85%, acetylene black 5-10%, Kynoar 10%, this pastel is coated onto on the Copper Foil as collector equably, vacuumize, roll extrusion obtains electrode.
Method of the present invention has the gentle and technology characteristic of simple of reaction condition.Synthesizing graphite alkene of the present invention and SnS
2Composite nano materials have widely as the electrode material of new forms of energy battery lithium ion battery, electrochemistry storage and Development of Magnesium Electrode Materials, kollag and catalyst carrier and use.
Method of the present invention compared with the prior art has following outstanding advantage:
(1) because Graphene has excellent properties such as high specific area, superpower mechanical property, high conduction and heat conduction, therefore, Graphene of the present invention and SnS
2Composite nano materials have and strengthen mechanical property, conduction and heat conductivility, help its electrode reaction, the electron transport in the catalytic reaction process as the new forms of energy battery electrode material, strengthen the chemical property and the catalytic performance of composite nano materials.And the superpower mechanical property of Graphene has also strengthened the mechanical property of composite nano materials, can improve its tribological property as kollag.Graphene and SnS in addition
2Compound, because the big ∏ key and the SnS of Graphene
2The interaction of surface electronic structure can form the electronic structure between a kind of new different material, and the electronics of participation effect can the height delocalization, helps the quick transmission of electronics in the electrochemical reaction process.This Graphene and SnS
2Composite nano materials have the performance of using widely and strengthening improvement as electrode material electrochemistry storage lithium, electrochemistry storage magnesium and catalyst carrier etc.
(2) the present invention's graphene oxide, and butter of tin, L-cysteine are raw material, adopt original position hydrothermal reduction method to become out Graphene and SnS
2Composite nano materials.Synthetic method of the present invention has the reaction condition gentleness, and technology is simple, the advantage of productive rate height and favorable reproducibility.
(3) in the course of reaction of the present invention, the graphene oxide in-situ reducing becomes Graphene, and is compounded to form composite material with stannic disulfide nano material that the original position hydro-thermal reaction forms.Its advantage is: the graphite oxide nanometer sheet contains abundant oxygen-containing functional group (as: hydroxyl, carbonyl and carboxyl etc.), in hydro-thermal reaction solution, reunited again no longer easily later on or be deposited in together by ultrasonic dispersion, and the functional group on graphite oxide surface can be adsorbed on tin ion the surface of graphite oxide nanometer sheet by complexing, can be generated in-situ Graphene and SnS in the reproducibility hydrothermal reaction process
2The nano material height is evenly compound.
(4) the L-cysteine contains a plurality of functional group (as: NH
2,-COOH and-SH), these functional groups can provide coordination atom and ion to form coordinate bond.Therefore, the L-cysteine can form coordination with the tin ion ion in the solution.Owing to the existence of graphene oxide in the solution, just having formed the coordination mode of graphene oxide-tin ion-L-cysteine simultaneously, can be generated in-situ Graphene and SnS in the reproducibility hydrothermal reaction process
2The nano material height is compound nano material evenly.
(5) synthesizing graphite alkene of the present invention and SnS
2The method of composite nano materials be also advantageous in that: by adjusting the ratio of raw material in the synthetic solvent, can obtain the Graphene and the SnS of different proportion
2Composite nano materials, Graphene and SnS
2The difference of nano material ratio can be adjusted SnS
2The degree of crystallinity of nano material makes the application of its suitable different field.
(4) existence of graphene nanometer sheet in the intermediate product in the preparation process, can suppress the excessive crystal growth and the reunion of stannic disulfide in the heat treatment process, obtain relative crystallinity is low and the number of plies is less the stannic disulfide nano material and the composite nano materials of graphene nanometer sheet, such composite nano materials has high electrochemistry and stores lithium capacity and overstable cycle performance.
(3) method of the present invention has the reaction condition gentleness, and technology is simple, the advantage of productive rate height and favorable reproducibility.Because graphene nanometer sheet and SnS
2Synergy, the present invention is with graphene nanometer sheet and SnS
2Composite nano materials be that the electrode of lithium ion battery of the active material preparation of electrode has high electrochemistry storage lithium capacity and overstable cycle performance.
Description of drawings
Fig. 1 Graphene and SnS
2The SEM of composite nano materials and TEM pattern.
(a) SnS of embodiment 1 preparation
2The SEM of nano material and TEM pattern;
(b) Graphene and the SnS of embodiment 1 preparation
2The SEM of composite nano materials and TEM pattern, Graphene and SnS
2The ratio of amount is 2: 1.
Fig. 2 Graphene and SnS
2The XRD figure of composite nano materials.
(a) XRD of the synthetic Graphene of embodiment 1 comparative example;
(b) Graphene and the SnS of embodiment 1 preparation
2The XRD figure of composite nano materials, Graphene and SnS
2The ratio of amount is 2: 1;
(c) the synthetic SnS of embodiment 1 comparative example
2The XRD figure of nano material.
Fig. 3 Graphene/SnS
2The composite nano materials electrode, Graphene electrodes and SnS
2The charge/discharge capacity of nano material electrode and cycle performance.
(a) Graphene/SnS of embodiment 1 preparation
2The composite nano materials electrode;
(b) Graphene electrodes of embodiment 1 preparation;
(c) SnS of embodiment 1 preparation
2The nano material electrode.
Embodiment
Embodiment 1:
Graphene/SnS
2The lithium ion cell electrode preparation method of composite nano materials: the 1) preparation of graphite oxide nanometer sheet: under 0 ℃ of ice bath, 4.0mmol (0.048g) graphite powder is distributed in the 20mL concentrated sulfuric acid, stirs adding 0.03g KMnO down
4, institute adds KMnO
4Quality be 3 times of graphite, stirred 30 minutes, temperature rises to about 30 ℃, adds the 45ml deionized water, stirs the H of adding 10ml mass concentration 30% 20 minutes
2O
2, stirred 5 minutes, through centrifugation, with obtaining the graphite oxide nanometer sheet behind mass concentration 5%HCl solution, deionized water and the acetone cyclic washing;
2) 1.94g (16mmol) L-cysteine is dissolved in the 160ml deionized water, adds 0.70g (2mmol) butter of tin (SnCl then
45H
2And stir and to make its dissolving, L-cysteine and SnCl in the mixed solution O),
4Mol ratio be 8: 1.Then with the 1st) step add in this solution with the prepared graphite oxide nanometer sheet of the graphite of 4.0mmol (0.048g), the amount ratio of butter of tin is 2: 1 in the amount of substance of used graphite raw material and the solution, sonicated 1.0h, the graphite oxide nanometer sheet is well dispersed in the hydro-thermal reaction solution, then this mixture is transferred in the hydrothermal reaction kettle, in 180 ℃ of following hydro-thermal reactions 12 hours, natural cooling, centrifugation, fully wash the back with deionized water and collect also drying, obtain Graphene and SnS
2Composite nano materials, Graphene and SnS in the composite nano materials
2The ratio of amount be 2: 1.SEM and XRD analysis show that composite material is Graphene and SnS
2Composite nano materials.SEM and XRD figure are seen Fig. 1 and Fig. 2 respectively.
3) with above-mentioned Graphene that makes and SnS
2Composite nano materials (Graphene and SnS
2The ratio of amount be 2: 1) prepare electrode as electroactive substance, composite nano materials active material and acetylene black are under agitation fully mixed with the N-methyl pyrrolidone solution of the Kynoar of mass concentration 5%, the uniform pastel of furnishing, this pastel is coated onto on the Copper Foil as collector equably, at 120 ℃ of following vacuumize 12h, obtain electrode through roll extrusion again after the taking-up then.Wherein the mass percentage content of each component is: nano composite material active material 80%, acetylene black 10%, Kynoar 10%.
To electrode and reference electrode, electrolyte is 1.0M LiPF with the conduct of lithium paper tinsel
6EC/DMC solution (1: 1in volume), barrier film is polypropylene film (Celguard-2300), is assembled into test battery in being full of the suitcase of argon gas.Charging and discharging currents density 100mA/g, voltage range 0.01～3.00V are carried out in the test of battery constant current charge-discharge on programme controlled auto charge and discharge instrument.The test result of electrode electro Chemical performance is seen Fig. 3.
As a comparison, Graphene and SnS have been synthesized respectively with similar hydrothermal method
2Nano material has carried out characterizing (seeing Fig. 1 and Fig. 2) with SEM and XRD, and has prepared Graphene electrodes and SnS as stated above
2The nano material electrode has been assembled test battery, has carried out the test of charge-discharge performance, and test result is seen Fig. 3.
As can be seen from Figure 3, with Graphene and SnS
2The electrode of nano material preparation, its initial reversible capacity is 912mAh/g, is 925mAh/g at 50 later its capacity of circulation; And with the synthetic SnS of hydro-thermal
2Nano material is the electrode of active material, and its initial reversible capacity is 470mAh/g, and 50 later its capacity that circulate drop to 180mAh/g; Graphene is the electrode of active material, and its initial reversible capacity is 670mAh/g, and 50 later its capacity that circulate drop to 440mAh/g, and Graphene and SnS are described
2The electrode of nano material preparation compares SnS
2Nano material electrode and Graphene electrodes have higher specific capacity and better cyclical stability.
Embodiment 2:
Graphene/SnS
2The lithium ion cell electrode preparation method of composite nano materials: the 1) preparation of graphite oxide nanometer sheet: under 0 ℃ of ice bath, 2.0mmol (0.024g) graphite powder is distributed in the 25mL concentrated sulfuric acid, stirs adding KMnO down
4, institute adds KMnO
4Quality be 4 times of graphite, stirred 40 minutes, temperature rises to about 33 ℃, adds the 50ml deionized water, stirs the H of adding 12ml mass concentration 30% 25 minutes
2O
2, stirred 5-10 minute, through centrifugation, with obtaining the graphite oxide nanometer sheet behind mass concentration 5%HCl solution, deionized water and the acetone cyclic washing;
2) 1.22g (10mmol) L-cysteine is dissolved in the 150ml deionized water, adds 0.70g (2mmol) butter of tin (SnCl then
45H
2And stir and to make its dissolving, L-cysteine and SnCl in the mixed solution O),
4Mol ratio be 5: 1, then with the 1st) step add in this solution with the prepared graphite oxide nanometer sheet of the graphite of 2.0mmol (0.024g), the amount ratio of butter of tin is 1: 1 in the amount of substance X of used graphite raw material and the solution, sonicated 1.5h, the graphite oxide nanometer sheet is well dispersed in the hydro-thermal reaction solution, then this mixture is transferred in the hydrothermal reaction kettle, reactor is incubated 16 hours down at 190 ℃, natural cooling, centrifugation, fully wash the back with deionized water and collect also drying, obtain Graphene and SnS
2Composite nano materials, Graphene and SnS in the composite nano materials
2The ratio of amount be 1: 1.SEM and XRD analysis show that composite material is Graphene and SnS
2Composite nano materials.
3) with above-mentioned Graphene that makes and SnS
2Composite nano materials (Graphene and SnS
2The ratio of amount be 1: 1) prepare electrode as electroactive substance, composite nano materials active material and acetylene black are under agitation fully mixed with the N-methyl pyrrolidone solution of the Kynoar of mass concentration 5%, the uniform pastel of furnishing, this pastel is coated onto on the Copper Foil as collector equably, at 120 ℃ of following vacuumize 12h, obtain electrode through roll extrusion again after the taking-up then.Wherein the mass percentage content of each component is: nano composite material active material 80%, acetylene black 10%, Kynoar 10%.
Press the method assembling test battery of embodiment 1 and the charge-discharge performance of test electrode, test result shows: Graphene and SnS
2The initial reversible capacity of the electrode of nano material is 832mAh/g, is 839mAh/g at 50 later capacity of circulation, and Graphene and SnS are described
2The nano material electrode has high specific capacity and excellent cyclical stability.
Embodiment 3:
Graphene/SnS
2The lithium ion cell electrode preparation method of composite nano materials: the 1) preparation of graphite oxide nanometer sheet: under 0 ℃ of ice bath, 4.5mmol (0.054g) graphite powder is distributed in the 25mL concentrated sulfuric acid, stirs adding KMnO down
4, institute adds KMnO
4Quality be 4 times of graphite, stirred 50 minutes, temperature rises to about 35 ℃, adds the 50ml deionized water, stirs the H of adding 20ml mass concentration 30% 30 minutes
2O
2, stirred 15 minutes, through centrifugation, with obtaining the graphite oxide nanometer sheet behind mass concentration 5%HCl solution, deionized water and the acetone cyclic washing;
2) 1.454g (12mmol) L-cysteine is dissolved in the 150ml deionized water, adds 0.52g (1.5mmol) butter of tin (SnCl then
45H
2And stir and to make its dissolving, L-cysteine and SnCl in the mixed solution O),
4Mol ratio be 8: 1, then with the 1st) step add in this solution with the prepared graphite oxide nanometer sheet of the graphite of 4.5mmol (0.054g), the amount ratio of butter of tin is 3: 1 in the amount of substance X of used graphite raw material and the solution, sonicated 2.0h, the graphite oxide nanometer sheet is well dispersed in the hydro-thermal reaction solution, then this mixture is transferred in the hydrothermal reaction kettle, reactor is incubated 20 hours down at 200 ℃, natural cooling, centrifugation, fully wash the back with deionized water and collect also drying, obtain Graphene and SnS
2Composite nano materials, Graphene and SnS in the composite nano materials
2The ratio of amount be 3: 1.SEM and XRD analysis show that composite material is Graphene and SnS
2Composite nano materials.
3) with above-mentioned Graphene that makes and SnS
2Composite nano materials (Graphene and SnS
2The ratio of amount be 3: 1) prepare electrode as electroactive substance, composite nano materials active material and acetylene black are under agitation fully mixed with the N-methyl pyrrolidone solution of the Kynoar of mass concentration 5%, the uniform pastel of furnishing, this pastel is coated onto on the Copper Foil as collector equably, at 120 ℃ of following vacuumize 12h, obtain electrode through roll extrusion again after the taking-up then.Wherein the mass percentage content of each component is: nano composite material active material 85%, acetylene black 5%, Kynoar 10%.
Press the method assembling test battery of embodiment 1 and the charge-discharge performance of test electrode, test result shows: Graphene and SnS
2The initial reversible capacity of the electrode of nano material is 863mAh/g, is 852mAh/g at 50 later capacity of circulation, and Graphene and SnS are described
2The nano material electrode has high specific capacity and excellent cyclical stability.
Embodiment 4:
Graphene/SnS
2The lithium ion cell electrode preparation method of composite nano materials: the 1) preparation of graphite oxide nanometer sheet: under 0 ℃ of ice bath, 8.0mmol (0.096g) graphite powder is distributed in the 25mL concentrated sulfuric acid, stirs adding KMnO down
4, institute adds KMnO
4Quality be 4 times of graphite, stirred 52 minutes, temperature rises to about 32 ℃, adds the 40ml deionized water, stirs the H of adding 15ml mass concentration 30% 15 minutes
2O
2, stirred 8 minutes, through centrifugation, with obtaining the graphite oxide nanometer sheet behind mass concentration 5%HCl solution, deionized water and the acetone cyclic washing;
1) 2.423g (20mmol) L-cysteine is dissolved in the 150ml deionized water, adds 0.70g (2mmol) butter of tin (SnCl then
45H
2And stir and to make its dissolving, L-cysteine and SnCl in the mixed solution O),
4Mol ratio be 10: 1, then with the 1st) step add in this solution with the prepared graphite oxide nanometer sheet of the graphite of 8.0mmol (0.096g), the amount ratio of butter of tin is 4: 1 in the amount X of used graphite raw material and the solution, sonicated 2.0h, the graphite oxide nanometer sheet is well dispersed in the hydro-thermal reaction solution, then this mixture is transferred in the hydrothermal reaction kettle, reactor is incubated 18 hours down at 200 ℃, natural cooling, centrifugation, fully wash the back with deionized water and collect also drying, obtain Graphene and SnS
2Composite nano materials, Graphene and SnS in the composite nano materials
2The ratio of amount be 4: 1.SEM and XRD analysis show that composite material is Graphene and SnS
2Composite nano materials.
3) with above-mentioned Graphene that makes and SnS
2Composite nano materials (Graphene and SnS
2The ratio of amount be 4: 1) prepare electrode as electroactive substance, composite nano materials active material and acetylene black are under agitation fully mixed with the N-methyl pyrrolidone solution of the Kynoar of mass concentration 5%, the uniform pastel of furnishing, this pastel is coated onto on the Copper Foil as collector equably, at 120 ℃ of following vacuumize 12h, obtain electrode through roll extrusion again after the taking-up then.Wherein the mass percentage content of each component is: nano composite material active material 85%, acetylene black 5%, Kynoar 10%.
Press the method assembling test battery of embodiment 1 and the charge-discharge performance of test electrode, test result shows: Graphene and SnS
2The initial reversible capacity of the electrode of nano material is 786mA/g, is 765mAh/g at 50 later capacity of circulation, and Graphene and SnS are described
2The nano material electrode has high specific capacity and excellent cyclical stability.
Embodiment 5:
Graphene/SnS
2The lithium ion cell electrode preparation method of composite nano materials: the 1) preparation of graphite oxide nanometer sheet: under 0 ℃ of ice bath, 10.0mmol (0.12g) graphite powder is distributed in the 25mL concentrated sulfuric acid, stirs adding KMnO down
4, institute adds KMnO
4Quality be 4 times of graphite, stirred 40 minutes, temperature rises to about 33 ℃, adds the 50ml deionized water, stirs the H of adding 12ml mass concentration 30% 25 minutes
2O
2, stirred 5-10 minute, through centrifugation, with obtaining the graphite oxide nanometer sheet behind mass concentration 5%HCl solution, deionized water and the acetone cyclic washing;
2) 1.22g (10mmol) L-cysteine is dissolved in the 150ml deionized water, adds 3.50g (10mmol) butter of tin (SnCl then
45H
2And stir and to make its dissolving, L-cysteine and SnCl in the mixed solution O),
4Mol ratio be 1: 1, then with the 1st) step add in this solution with the prepared graphite oxide nanometer sheet of the graphite of 10.0mmol (0.12g), the amount ratio of butter of tin is 1: 1 in the amount of substance X of used graphite raw material and the solution, sonicated 2.0h, the graphite oxide nanometer sheet is well dispersed in the hydro-thermal reaction solution, then this mixture is transferred in the hydrothermal reaction kettle, reactor is incubated 20 hours down at 200 ℃, natural cooling, centrifugation, fully wash the back with deionized water and collect also drying, obtain Graphene and SnS
2Composite nano materials, Graphene and SnS in the composite nano materials
2The ratio of amount be 1: 1.SEM and XRD analysis show that composite material is Graphene and SnS
2Composite nano materials.
3) with above-mentioned Graphene that makes and SnS
2Composite nano materials (Graphene and SnS
2The ratio of amount be 1: 1) prepare electrode as electroactive substance, composite nano materials active material and acetylene black are under agitation fully mixed with the N-methyl pyrrolidone solution of the Kynoar of mass concentration 5%, the uniform pastel of furnishing, this pastel is coated onto on the Copper Foil as collector equably, at 120 ℃ of following vacuumize 12h, obtain electrode through roll extrusion again after the taking-up then.Wherein the mass percentage content of each component is: nano composite material active material 80%, acetylene black 10%, Kynoar 10%.
Press the method assembling test battery of embodiment 1 and the charge-discharge performance of test electrode, test result shows: Graphene and SnS
2The initial reversible capacity of the electrode of nano material is 815mAh/g, is 802mAh/g at 50 later capacity of circulation, and Graphene and SnS are described
2The nano material electrode has high specific capacity and excellent cyclical stability.
Claims (2)
1. Graphene/SnS
2The lithium ion cell electrode of composite nano materials, the active material that it is characterized in that this electrode is Graphene and SnS
2Composite nano materials, all the other are acetylene black and Kynoar, the mass percentage content of each component is: nano composite material active material 75-85%, acetylene black 5-10%, Kynoar 10%, wherein, Graphene and SnS in the nano composite material active material
2The ratio of amount is 1 between the nano material: 1-4: 1.
2. Graphene/SnS according to claim 1
2The lithium ion cell electrode of composite nano materials is characterized in that the preparation method may further comprise the steps:
1) preparation of graphite oxide nanometer sheet: under 0 ℃ of ice bath, the 0.015-0.072g graphite powder is distributed in the 20-25mL concentrated sulfuric acid, stirs adding KMnO down
4, institute adds KMnO
4Quality be graphite 3-4 doubly, stirred 30-60 minute, temperature rises to about 30-35 ℃, adds the 40-50ml deionized water, stirs the H of adding 10-15ml mass concentration 30% 20-30 minute
2O
2, stirred 5-20 minute, through centrifugation, with obtaining the graphite oxide nanometer sheet behind mass concentration 5%HCl solution, deionized water and the acetone cyclic washing;
2) the L-cysteine is dissolved in the deionized water, adds butter of tin (SnCl then
45H
2O) and fully stir and make its dissolving, the mol ratio of L-cysteine and butter of tin was at 6: 1～12: 1 in the solution, again will be by the 1st) preparation-obtained graphite oxide nanometer sheet of step adds in this solution, the 1st) used graphite raw material amount of step is 1: 1～4: 1 with the ratio of the amount of butter of tin, sonicated 1-2h, the graphite oxide nanometer sheet is well dispersed in the hydro-thermal reaction solution, this mixture is changed in the hydrothermal reaction kettle of inner liner polytetrafluoroethylene and seal, at 180-200 ℃ of reaction 20-36h, the product centrifugation that obtains, and with deionized water and absolute ethanol washing, drying obtains Graphene and SnS
2Composite nano materials;
3) with Graphene and SnS
2Composite nano materials as the active material of electrode, under agitation fully mix the uniform pastel of furnishing with the N-methyl pyrrolidone solution of the Kynoar of acetylene black and mass concentration 5%, each constituent mass percentage is: nano composite material active material 75-85%, acetylene black 5-10%, Kynoar 10%, this pastel is coated onto on the Copper Foil as collector equably, vacuumize, roll extrusion obtains electrode.
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