CN106374095A - Preparation method of composite material used as lithium-sulfur battery cathode material - Google Patents

Preparation method of composite material used as lithium-sulfur battery cathode material Download PDF

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CN106374095A
CN106374095A CN201610979610.XA CN201610979610A CN106374095A CN 106374095 A CN106374095 A CN 106374095A CN 201610979610 A CN201610979610 A CN 201610979610A CN 106374095 A CN106374095 A CN 106374095A
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sulfur
inorganic compound
preparation
layered inorganic
lithium
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CN106374095B (en
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王忠德
刘晔
岳喜岩
郭守敬
李青
宋为涛
郝晓刚
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Taiyuan University of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/483—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides for non-aqueous cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/502—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese for non-aqueous cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/60—Selection of substances as active materials, active masses, active liquids of organic compounds
    • H01M4/602—Polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention belongs to the field of preparation of a lithium-sulfur battery cathode material, and particularly relates to a preparation method of a layered inorganic compound/conducting polymer/sulfur composite material used as the lithium-sulfur battery cathode material. According to the preparation method disclosed by the invention, a polymer and an inorganic layered compound are compounded in nanoscale, sulfur is coated and clamped between slice layers, so that a shuttling effect of sulfur is prevented; a layered material, e.g., a spring, can buffer a stress of volume expansion, keeps an inherent structure of the material, reduces active substance loss caused by volume expansion, and improves material cycle performance; the organic and inorganic composite layered material has a potential response cation exchange attribute, has a synergistic effect in the charging and discharging process when being compounded with sulfur, and improves rate capability of a battery; and a layer spacing of the layered compound can be regulated, and the suitable layer spacing is beneficial to transmission of Li+. The preparation method disclosed by the invention is simple in process step and convenient to operate; and the layered inorganic compound/conducting polymer/sulfur composite material has a wide application prospect in the lithium-sulfur battery cathode material.

Description

A kind of preparation method of the composite as lithium sulfur battery anode material
Technical field
The invention belongs to lithium sulfur battery anode material preparation field, specifically one kind is as lithium sulfur battery anode material Layered inorganic compound/conducting polymer/sulfur composite preparation method.
Background technology
With the fast development of mobile electronic device and new-energy automobile, the mankind to secondary energy storage battery specific energy and compare work( The requirement more and more higher of rate.Lithium ion battery is one of now widely used secondary cell, the positive pole material wherein having been commercialized Material theoretical capacity all relatively low, limited by theoretical specific capacity, further lifting energy density extremely difficult it is impossible to meet future The demand to high-energy density secondary battery for the development, lithium-sulfur cell due to having very high storage lithium theoretical specific capacity 1675mah/g, And elemental sulfur is as just having rich content, cheap, environmental friendliness it is considered to be one kind is very promising of future generation high Energy density secondary cell.
The development of lithium-sulfur cell also faces very big challenge simultaneously, and elemental sulfur is the insulator of electronics and ion at room temperature (5×10-3S/cm, room temperature) it is impossible to use separately as positive electrode, need to be combined sulfur with other conductive materials, with Improve the conductive capability of electrode material；Intermediate product polysulfide (the li of other sulfur in charge and discharge process2sx, x > 2), having Dissolve in machine electrolyte, can migrate between both positive and negative polarity, that is, produce shuttle effect, lead to the loss of active substance, capacity attenuation Quickly；And change in volume in charge and discharge process for the sulfur is larger, is fully converted to li by sulfur2During s, volumetric expansion about 80%, draws Play active substance differentiation and come off, and then lead to capacity to be decayed rapidly, this series of problem results in positive active material profit Low and circulating battery stability is poor with rate.
For solving the above problems, people utilize metal electrology characteristic, redox active and the storage lithium of conducting polymer special Property, and sulfur is combined as positive electrode, improves electric conductivity with the dissolving limiting polysulfide.Simply chemistry cladding can improve The electric conductivity of material, reduces charge transfer impedance, but can not effectively overcome the active substance that sulfur volumetric expansion leads to run off.
On the basis of the present invention is based on conducting polymer in-stiu coating sulfur, introduce layered inorganic compound, using its current potential Response cation exchange attribute is compounded in charge and discharge process with sulfur has synergism, improves the high rate performance of battery, stratiform Compound layer spacing scalable, suitable interlamellar spacing is conducive to li+Transmission, stratified material such as spring available buffer volumetric expansion answer Power, keeps the inherent structure of material, improves the layered inorganic compound/conduction of the cycle performance preparation structure function admirable of battery Polymer nanocomposites, sulfur are sandwiched simple in interlayer step, easy to operate, have good application prospect.
Content of the invention
The present invention in order to solve the problems, such as that lithium-sulphur cell positive electrode active material utilization rate is low and circulating battery stability is poor, Provide a kind of preparation side of the layered inorganic compound/conducting polymer/sulfur composite as lithium sulfur battery anode material Method.
The present invention is achieved by the following technical solutions: a kind of layered inorganic chemical combination as lithium sulfur battery anode material The preparation method of thing/conducting polymer/sulfur composite, comprises the steps:
(1) delamination of layered inorganic compound: layered inorganic compound is disperseed, and adds intercalator, stir 5 ~ 48h, stratiform Inorganic compound delamination forms monolayer compound；
(2) polymer monomer intercalation, sulphur content dissipate: polymer monomer solution is added in monolayer compound solution, using rotating speed After 100 ~ 5000r/min is stirred disperseing 1 ~ 10h, adds elemental sulfur, ultrasonic disperse 10 ~ 60 min, be stirred for 1 ~ 5h, make sulfur Simple substance is dispersed in mixed solution；
(3) polymerization cladding: in mixed solution, oxidant and polymer monomer mol ratio are 1:1 ~ 2:1 at the uniform velocity Deca oxidant, Time for adding controls in 10 ~ 120min；
(4) layered inorganic compound reassembles: at the uniform velocity Deca concentration is 0.5 ~ 3m acid (inorganic) or alkali is (inorganic) molten to mixing In liquid, time for adding controls in 10 ~ 80min, so that monolayer compound is reassembled, thus polymer and elemental sulfur are sandwiched in layer Between, reaction is replaced washing, is filtered with organic solvent and deionized water after terminating, and is dried to obtain layered inorganic compound/conduction and gathers Compound/sulfur composite.
The interlamellar spacing of inorganic layered compounds when being embodied as, can be adjusted by adjusting the addition of polymer.Certainly, The addition of elemental sulfur can produce impact to interlamellar spacing, but is realizing mainly passing through when interlamellar spacing is adjusted to adjust polymer Addition.
Compared with prior art, the invention has the advantages that (1) by polymer and inorganic layered compounds in nanometer Yardstick is combined, and sulfur is sandwiched in interlayer, prevents the shuttle effect of sulfur；(2) stratified material such as spring available buffer volumetric expansion Stress, keeps the inherent structure of material, improves the cycle performance of battery；(3) stratified material of organo-mineral complexing has in itself Potential response cation exchange attribute, is compounded in charge and discharge process with sulfur and has synergism, improves the forthright again of battery Energy；(4) lamellar compound interlamellar spacing can be adjusted, and suitable interlamellar spacing is conducive to li+Transmission.(5) Inorganic whisker layer Shape compound is cheap, aboundresources, and synthetic method is simple.Therefore present invention process step is simple, easy to operate, layered inorganic Compound/conducting polymer/sulfur composite has good application prospect in lithium sulfur battery anode material.
Brief description
The xrd figure of zirconium phosphate/polypyrrole/sulfur composite that Fig. 1 prepares for embodiment 2.
The 2025 type button cells that Fig. 2 prepares for embodiment 2 first charge-discharge figure under different multiplying.Permissible by scheming Find out: zirconium phosphate/polypyrrole/sulfur composite has good high rate performance as lithium sulfur battery anode material.
The 1st, 3,5 charge and discharge electrographs of 2025 type button cell that Fig. 3 prepares for embodiment 4.As seen from the figure: cover De- soil/polypyrrole/sulfur composite is stablized in 1000mah/g as front 5 specific discharge capacities of lithium sulfur battery anode material.
Specific embodiment
The enforcement it is clear that described will be clearly and completely described to the technical scheme in the embodiment of the present invention below Example is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common The every other embodiment that technical staff is obtained under not making creative work precursor, broadly falls into the model of present invention protection Enclose.
Preferably, laminate inorganic compound of the present invention be metal phosphate, clay, in layered oxide at least one Kind.Described metal phosphate preferably phosphoric acid zirconium, phosphoric acid stannum, the preferred montmorillonite of described clay, described layered oxide is excellent Select vanadium oxide, molybdenum trioxide, manganese oxide.When being embodied as, intercalator need to be determined according to the layered inorganic compound being adopted.
In the present invention, the concentration preferably 1 ~ 50mm after the dispersion of step (1) laminate inorganic compound, more preferably 10 ~15mm.
Described polymer monomer is preferably pyrroles, aniline, acrylonitrile, at least one in thiophene in the present invention.At this In some embodiments of invention, any one polymer monomer can be combined with other one or more polymer monomer, shape Become the polymer in lithium sulfur battery anode material.
In the present invention, the preferred granularity of described elemental sulfur is 1 ~ 5 μm, more preferably 3 ~ 5 μm.Present invention preferably employs Elemental sulfur is more than 99% purity.
Described oxidant preferably adopts in iron chloride, Ammonium persulfate., sodium peroxydisulfate, potassium peroxydisulfate in the present invention Kind.
When being embodied as, described acid is one of sulphuric acid, hydrochloric acid, phosphoric acid, and described alkali is sodium hydroxide, hydroxide One kind of potassium.
During concrete application, described organic solvent is dehydrated alcohol, acetone, butanol or carbon tetrachloride.
The present invention is explained further below in conjunction with example, but embodiment does not limit in any form to the present invention.
Embodiment 1:
(1) delamination of montmorillonite: prepare 1mm montmorillonite solution, and add 15mm sulphuric acid, stir 5h.
(2) polymer monomer intercalation, sulphur content dissipate: 20mm acrylonitrile monemer is added in montmorillonite solution after acidifying, makes Carried out with rotating speed 100r/min disperseing after 5h, in montmorillonite and polyacrylonitrile gross mass: the ratio of sulphur simple substance=1:1 adds simple substance Sulfur, ultrasonic disperse 30min, reuse in homogenizer stirring and stir 1 h, make purity 99% sulphur simple substance granularity be 5 μm and uniformly divide It is dispersed in mixed solution.
(3) polymerization cladding: be slowly added dropwise 30mm sodium peroxydisulfate in mixed solution, time for adding controls in 10min.Over cure Sour sodium is 1:1 with the mol ratio of acrylonitrile monemer.
(4) layered inorganic compound reassembles: Deca concentration be 0.5m potassium hydroxide in mixed solution, time for adding Control in 60min, so that monolayer compound is reassembled, thus pyrroles and elemental sulfur are sandwiched in interlayer, reaction uses third after terminating Ketone and deionized water replace washing, filter, and are dried to obtain montmorillonite/polyacrylonitrile/sulfur composite.
Embodiment 2:
(1) delamination of layered inorganic compound: prepare 15mm phosphoric acid aqueous zirconium, and add intercalator 20 mm tetrabutyl hydrogen-oxygen Change ammonium, stir 6h, delamination forms transparent colloid solution after terminating.
(2) polymer monomer intercalation, sulphur content dissipate: 20mm pyrrole monomer is added in solution after delamination, using rotating speed After 800r/min carries out disperseing 4h, in zirconium phosphate and polypyrrole gross mass: the ratio addition elemental sulfur of sulphur simple substance=4:6, ultrasonic point Dissipate 40 min, reuse in homogenizer stirring and stir 4h, make purity 99% sulphur simple substance granularity be dispersed in mixing for 3 μm In solution.
(3) polymerization cladding: be slowly added dropwise 30mm iron chloride in mixed solution, time for adding controls in 120 min.Chlorination Ferrum is 2:1 with the mol ratio of pyrrole monomer.
(4) layered inorganic compound reassembles: for 3m hydrochloric acid in mixed solution, time for adding controls Deca concentration 60min, makes monolayer compound reassemble, thus pyrroles and elemental sulfur are sandwiched in interlayer, reaction terminate after with ethanol with go Ionized water replaces washing, filters, and is dried to obtain zirconium phosphate/polypyrrole/sulfur composite.
(5) by the zirconium phosphate/polypyrrole/sulfur composite preparing: super p:pvdf is mixed in the ratio of 7:2:1, Plus nmp stirring 2h, form uniform serosity, be coated on aluminium foil, dry and obtain lithium-sulphur cell positive electrode piece.
(6) by positive plate manufactured in the present embodiment and lithium piece, barrier film (glass fibre), electrolyte (1mol/l trifluoromethyl Sulfimide lithium, is dissolved in DOX, glycol dimethyl ether) it is assembled into 2025 type button cells and carry out electro-chemical test, Test result is shown in Fig. 2.0.02c first discharge specific capacity reaches 1480mah/g, 0.2c first discharge specific capacity 1285mah/g, 0.5c first discharge specific capacity 1150mah/g, 1c first discharge specific capacity 948 mah/g.
In above-mentioned and other embodiment, the manufacture method of 2025 type button cells is the common knowledge of this area, the present invention Here is not described in detail.
Embodiment 3:
(1) delamination of layered inorganic compound: prepare 5mm phosphoric acid stannum aqueous solution, and add intercalator 10mm tetrabutylammonium hydroxide Ammonium, stirs 12h, and delamination forms transparent colloid solution after terminating.
(2) polymer monomer intercalation, sulphur content dissipate: 10mm pyrrole monomer is added in solution after delamination, using rotating speed After 2000r/min carries out disperseing 1h, in phosphoric acid stannum and polypyrrole gross mass: the ratio of sulphur simple substance=3:7 adds elemental sulfur, ultrasonic Dispersion 60min, reuses in homogenizer stirring and stirs 4h, make purity 99% sulphur simple substance granularity be dispersed in mixing for 3 μm In solution.
(3) polymerization cladding: be slowly added dropwise 15mm iron chloride in mixed solution, time for adding controls in 80 min.Chlorination Ferrum is 1.5:1 with the mol ratio of pyrrole monomer.
(4) layered inorganic compound reassembles: for 2m sulphuric acid in mixed solution, time for adding controls Deca concentration 80min, makes monolayer compound reassemble, thus pyrroles and elemental sulfur are sandwiched in interlayer, reaction terminate after with butanol with go Ionized water replaces washing, filters, and is dried to obtain phosphoric acid stannum/polypyrrole/sulfur composite.
Embodiment 4:
(1) delamination of montmorillonite: prepare 50mm montmorillonite solution, and add 80mm sulphuric acid, stir 8h.
(2) polymer monomer intercalation, sulphur content dissipate: 20mm pyrrole monomer is added in montmorillonite solution after acidifying, uses After rotating speed 600r/min carries out disperseing 3h, in montmorillonite and polypyrrole gross mass: the ratio of sulphur simple substance=3:7 adds elemental sulfur, surpass Sound disperses 30min, reuses in homogenizer stirring and stirs 2h, so that purity 99% sulphur simple substance granularity is dispersed in for 3 μm mixed Close in solution.
(3) polymerization cladding: be slowly added dropwise 30mm Ammonium persulfate. in mixed solution, time for adding controls in 60min.Over cure Sour ammonium is 1.5:1 with the mol ratio of pyrrole monomer.
(4) layered inorganic compound reassembles: Deca concentration be 2m sodium hydroxide in mixed solution, time for adding control System, in 10min, makes monolayer compound reassemble, thus pyrroles and elemental sulfur are sandwiched in interlayer, reaction uses ethanol after terminating Replace washing, filter with deionized water, be dried to obtain montmorillonite/polypyrrole/sulfur composite.
(5) by the montmorillonite/polypyrrole/sulfur composite preparing: super p:pvdf is mixed in the ratio of 8:1:1, Plus nmp stirring 2h, form uniform serosity, be coated on aluminium foil, dry and obtain lithium-sulphur cell positive electrode piece.
(6) by positive plate manufactured in the present embodiment and lithium piece, barrier film (glass fibre), electrolyte (1 mol/l trifluoromethyl Sulfimide lithium, is dissolved in DOX, glycol dimethyl ether) it is assembled into 2025 type button cells and carry out electro-chemical test, Test result is shown in Fig. 3.0.2c electricity specific capacity is stablized in 1000mah/g, and coulombic efficiency reaches 100%.
Embodiment 5:
(1) delamination of layered inorganic compound: prepare 10mm vanadium oxide aqueous solution, and add intercalator 20mm tetrabutylammonium hydroxide Ammonium, stirs 6h, and delamination forms transparent colloid solution after terminating.
(2) polymer monomer intercalation, sulphur content dissipate: 15mm aniline monomer is added in solution after delamination, using rotating speed After 700r/min carries out disperseing 3h, in vanadium oxide and polyaniline gross mass: the ratio addition elemental sulfur of sulphur simple substance=4:6, ultrasonic point Scattered 60min, reuses in homogenizer stirring and stirs 4h, makes purity 99% sulphur simple substance granularity be dispersed in mixing for 3 μm molten In liquid.
(3) polymerization cladding: be slowly added dropwise 20mm Ammonium persulfate. in mixed solution, time for adding controls in 120min.Cross Ammonium sulfate is 2:1 with the mol ratio of aniline monomer.
(4) layered inorganic compound reassembles: for 3m hydrochloric acid in mixed solution, time for adding controls Deca concentration 60min, makes monolayer compound reassemble, thus pyrroles and elemental sulfur are sandwiched in interlayer, reaction terminate after with ethanol with go Ionized water replaces washing, filters, and is dried to obtain vanadium oxide/polyaniline/sulfur composite.
(5) by the vanadium oxide/polyaniline/sulfur composite preparing: super p:pvdf is mixed in the ratio of 8:1:1, Plus nmp stirring 2h, form uniform serosity, be coated on aluminium foil, dry and obtain lithium-sulphur cell positive electrode piece.
(6) by positive plate manufactured in the present embodiment and lithium piece, barrier film (glass fibre), electrolyte (1mol/l trifluoromethyl Sulfimide lithium, is dissolved in DOX, glycol dimethyl ether) it is assembled into 2025 type button cells and carry out electro-chemical test.
Embodiment 6:
(1) delamination of layered inorganic compound: prepare 20mm molybdenum trioxide aqueous solution, and add intercalator 20mm tetrabutyl hydrogen-oxygen Change ammonium, stir 48h, delamination forms transparent colloid solution after terminating.
(2) polymer monomer intercalation, sulphur content dissipate: 20mm thiophene monomer is added in solution after delamination, using rotating speed After 5000r/min carries out disperseing 10h, in molybdenum trioxide and polythiophene gross mass: the ratio of sulphur simple substance=3:7 adds elemental sulfur, surpass Sound disperses 10min, reuses in homogenizer stirring and stirs 5h, so that purity 99% sulphur simple substance granularity is dispersed in for 1 μm mixed Close in solution.
(3) polymerization cladding: be slowly added dropwise 25mm potassium peroxydisulfate in mixed solution, time for adding controls in 80min.Over cure Sour potassium is 1:1 with the mol ratio of thiophene monomer.
(4) layered inorganic compound reassembles: for 3m phosphoric acid in mixed solution, time for adding controls Deca concentration 80min, makes monolayer compound reassemble, thus pyrroles and elemental sulfur are sandwiched in interlayer, reaction uses carbon tetrachloride after terminating Replace washing, filter with deionized water, be dried to obtain molybdenum trioxide/polythiophene/sulfur composite.
Comparative example 1:
(1) sulphur content dissipates: weighs 0.3 g elemental sulfur ultrasonic disperse 20min in 200ml ultra-pure water, reuses homogenizer and stir Mix middle stirring 4h, so that purity 99% elemental sulfur granularity is dispersed in mixed solution for 3 μm.
(2) polymerization cladding: in polypyrrole gross mass: the ratio of sulphur simple substance=4:6 adds 0.2g pyrrole monomer, ultrasonic disperse 30min, is slowly added dropwise iron chloride in whipping process in mixed solution, and iron chloride is 2:1 with the mol ratio of pyrrole monomer, drips Plus time control is in 120min, after dripping, continue stirring 5h.
(3) by the polypyrrole preparing/sulfur positive electrode: super p:pvdf is mixed in the ratio of 7:2:1, plus nmp stirs Mix 2h, form uniform serosity, be coated on aluminium foil, dry and obtain lithium-sulphur cell positive electrode piece.
(4) by positive plate manufactured in the present embodiment and lithium piece, barrier film (glass fibre), electrolyte (1 mol/l trifluoromethyl Sulfimide lithium, is dissolved in DOX, glycol dimethyl ether) it is assembled into 2025 type button cells and carry out electro-chemical test. 0.2c first discharge specific capacity 758mah/g, is differed farther out with the 0.2c first discharge specific capacity of embodiment 4, it can be said that bright The interpolation of layered inorganic compound can effectively improve lithium-sulfur cell performance.

Claims (8)

1. a kind of preparation side of the layered inorganic compound/conducting polymer/sulfur composite as lithium sulfur battery anode material Method is it is characterised in that comprise the steps:
(1) delamination of layered inorganic compound: layered inorganic compound is disperseed, and adds intercalator, stir 5 ~ 48h, stratiform Inorganic compound delamination forms monolayer compound；
(2) polymer monomer intercalation, sulphur content dissipate: polymer monomer solution is added in monolayer compound solution, using rotating speed After 100 ~ 5000r/min is stirred disperseing 1 ~ 10h, adds elemental sulfur, ultrasonic disperse 10 ~ 60min, be stirred for 1 ~ 5h, make sulfur Simple substance is dispersed in mixed solution；
(3) polymerization cladding: in mixed solution, oxidant and polymer monomer mol ratio are 1:1 ~ 2:1 at the uniform velocity Deca oxidant, Time for adding controls in 10 ~ 120min；
(4) layered inorganic compound reassembles: at the uniform velocity Deca concentration is that 0.5 ~ 3m is sour or alkali is in mixed solution, time for adding Control in 10 ~ 80min, so that monolayer compound is reassembled, thus polymer and elemental sulfur are sandwiched in interlayer, after reaction terminates Replaced washing, filtered with organic solvent and deionized water, be dried to obtain layered inorganic compound/conducting polymer/sulfur composite wood Material.
2. a kind of layered inorganic compound/conducting polymer as lithium sulfur battery anode material according to claim 1/ The preparation method of sulfur composite it is characterised in that layered inorganic compound be metal phosphate, clay, stratiform oxidation At least one in thing.
3. a kind of layered inorganic compound/conducting polymer as lithium sulfur battery anode material according to claim 2/ The preparation method of sulfur composite is it is characterised in that the concentration after the dispersion of step (1) laminate inorganic compound is 1 ~ 50mm.
4. a kind of layered inorganic compound/conducting polymer as lithium sulfur battery anode material according to claim 1/ The preparation method of sulfur composite it is characterised in that described polymer monomer be pyrroles, in aniline, acrylonitrile, thiophene at least A kind of.
5. a kind of layered inorganic compound/conducting polymer as lithium sulfur battery anode material according to claim 3/ The preparation method of sulfur composite is it is characterised in that the granularity of described elemental sulfur is 1 ~ 5 μm.
6. a kind of layered inorganic compound/conducting polymer as lithium sulfur battery anode material according to claim 1/ The preparation method of sulfur composite is it is characterised in that described oxidant is iron chloride, Ammonium persulfate., sodium peroxydisulfate, persulfuric acid One of potassium.
7. a kind of layered inorganic compound/conducting polymer as lithium sulfur battery anode material according to claim 1/ It is characterised in that described acid is one of sulphuric acid, hydrochloric acid, phosphoric acid, described alkali is hydrogen to the preparation method of sulfur composite Sodium oxide, one kind of potassium hydroxide.
8. a kind of layered inorganic compound/conducting polymer as lithium sulfur battery anode material according to claim 1/ The preparation method of sulfur composite is it is characterised in that described organic solvent is dehydrated alcohol, acetone, butanol or carbon tetrachloride.
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CN107591523A (en) * 2017-08-22 2018-01-16 桂林电子科技大学 A kind of iron, nickel dopped activated carbon sulfur materials and its preparation method and application
CN109888198A (en) * 2018-12-27 2019-06-14 北京航空航天大学 A kind of metal intercalation oxidation molybdenum material and its preparation method and application
CN110534742A (en) * 2019-07-16 2019-12-03 江汉大学 A kind of preparation method of anode composite material of lithium sulfur battery
CN110660977A (en) * 2019-08-23 2020-01-07 太原理工大学 Lithium-sulfur electrochemical energy storage system and preparation method thereof
CN110911616A (en) * 2019-11-26 2020-03-24 电子科技大学 High-temperature-resistant multifunctional diaphragm for lithium-sulfur battery and preparation method thereof
CN112103487A (en) * 2020-09-14 2020-12-18 广东省科学院化工研究所 Bentonite/sulfur composite material and preparation method and application thereof
CN112331837A (en) * 2020-11-24 2021-02-05 中国科学院物理研究所 Organic-inorganic composite electrode material and preparation method and application thereof
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CN107591523A (en) * 2017-08-22 2018-01-16 桂林电子科技大学 A kind of iron, nickel dopped activated carbon sulfur materials and its preparation method and application
CN109888198A (en) * 2018-12-27 2019-06-14 北京航空航天大学 A kind of metal intercalation oxidation molybdenum material and its preparation method and application
CN109888198B (en) * 2018-12-27 2020-11-17 北京航空航天大学 Metal intercalation molybdenum oxide material and preparation method and application thereof
CN110534742A (en) * 2019-07-16 2019-12-03 江汉大学 A kind of preparation method of anode composite material of lithium sulfur battery
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CN110660977A (en) * 2019-08-23 2020-01-07 太原理工大学 Lithium-sulfur electrochemical energy storage system and preparation method thereof
CN110911616A (en) * 2019-11-26 2020-03-24 电子科技大学 High-temperature-resistant multifunctional diaphragm for lithium-sulfur battery and preparation method thereof
CN112928276A (en) * 2019-12-06 2021-06-08 中国科学院大连化学物理研究所 Composite sulfur positive electrode material and preparation method and application thereof
CN112103487A (en) * 2020-09-14 2020-12-18 广东省科学院化工研究所 Bentonite/sulfur composite material and preparation method and application thereof
CN112103487B (en) * 2020-09-14 2021-12-14 广东省科学院化工研究所 Bentonite/sulfur composite material and preparation method and application thereof
CN112331837A (en) * 2020-11-24 2021-02-05 中国科学院物理研究所 Organic-inorganic composite electrode material and preparation method and application thereof

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