CN110165222B - Preparation method and application of high-performance composite current collector of lithium-sulfur battery - Google Patents

Preparation method and application of high-performance composite current collector of lithium-sulfur battery Download PDF

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CN110165222B
CN110165222B CN201910574538.6A CN201910574538A CN110165222B CN 110165222 B CN110165222 B CN 110165222B CN 201910574538 A CN201910574538 A CN 201910574538A CN 110165222 B CN110165222 B CN 110165222B
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current collector
sulfur battery
battery
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sulfur
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CN110165222A (en
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张力
何倩眉
吕晓雪
熊杰
雷天宇
陈伟
胡音
李政翰
张淼
邬春阳
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University of Electronic Science and Technology of China
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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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Abstract

The invention provides a preparation method and application of a composite current collector of a high-performance lithium-sulfur battery, and belongs to the technical field of battery material preparation. According to the invention, a simple chemical synthesis method is adopted, and the nano metal sheet NiCo2O4 is combined with the carbon nano fiber, so that on one hand, polysulfide generated in the reaction is fixed on the anode of the battery by utilizing the characteristic of polarity of metal oxide, the technical problem that the carbon nano fiber has weak polarity and cannot adsorb polysulfide is solved, and the stability of the battery is improved; on the other hand, the advantages of multiple contact sites and strong electron conduction capability of the NiCo2O4 metal nano sheet are utilized, the electron conduction is accelerated, the reaction speed of electrochemical reaction in the battery is improved, compared with the traditional current collector, the unit capacity is improved by 70%, the cycle stability is improved by 100%, and the lithium-sulfur battery prepared on the basis of the current collector has higher rate capability and capacity.

Description

Preparation method and application of high-performance lithium-sulfur battery composite current collector
Technical Field
The invention belongs to the technical field of battery material preparation, and particularly relates to a preparation method and application of a high-performance lithium-sulfur battery composite current collector.
Background
The development of new energy automobiles is an important measure for relieving the energy pressure of China, coping with climate change and promoting the sustainable development of the automobile industry and the transportation industry. In recent years, the external dependence of China's petroleum consumption is as high as 60.6%, the energy safety, especially the safety of oil and gas resources, has become a great hidden danger of China's economic development, and the vigorous development of renewable energy is a necessary way to realize the transformation of China's automobile industry and is also a strategic choice to maintain the energy safety of China. However, the uncontrollable and unstable nature of renewable energy requires the use of reliable energy storage batteries. The traditional lithium ion battery, one of the most successful energy storage devices at present, is limited by its own storage capacity, and is still difficult to meet the requirements of future power batteries on high specific capacity and high energy density of the energy storage battery. Therefore, the development of high-performance lithium ion batteries is a necessary approach for the development of new energy automobiles.
The theoretical specific capacity of a lithium-sulfur battery (Li-S) is up to 1675mAh/g, the theoretical specific energy is up to 2600 Wh/kg, which is five to ten times that of the traditional lithium iron phosphate battery, and sulfur has the characteristics of no pollution and low cost, so that the Li-S battery becomes a current international research hotspot and is considered as an ideal choice for a power battery for a new energy vehicle in the future (Nature Mater.8,500, 2009). However, the dissolution of polysulfide causes the loss of cathode material, and the shuttling effect of polysulfide through the separator (Nature mater.11,19, 2012) and the like, which make the cycling stability of the lithium-sulfur battery very poor, and far from reaching the requirement of practical use, the commercial lithium-sulfur battery is developed slowly.
Current collectors, which are one of the important components of lithium sulfur batteries, have received attention from many researchers. At present, the Li-S battery mostly uses aluminum foil as a current collector, and has the advantages of light weight, low price and the like; however, the aluminum foil has single functionalization and cannot bear higher load, and the aluminum foil has natural limitation when being used as a current collector of the Li-S energy storage battery. 3D current collectors such as carbon cloth, nickel foam and the like can provide a large amount of contact area for sulfur due to the existence of a large amount of net-shaped spaces, and therefore, the production of energy storage batteries with high load becomes possible by using the current collectors. However, since the 3D current collector does not have the characteristic of adsorbing polar polysulfides, the polysulfides generated during the battery cycle process are easily dissolved out of the current collector, resulting in significant capacity loss; moreover, the traditional 3D current collector has poor conductivity and cannot meet the requirement of rapid battery reaction.
Disclosure of Invention
Aiming at the problems that the existing current collector in the background technology cannot simultaneously solve the shuttling effect and the like caused by high sulfur load and polysulfide, the invention aims to provide a preparation method and application of a high-performance composite current collector of a lithium-sulfur battery. The invention adopts a simple chemical synthesis method to prepare NiCo nano metal sheets 2 O 4 The polysulfide generated in the reaction is fixed on the anode of the battery by utilizing the characteristic that the metal oxide has polarity, so that the technical problem that the carbon nanofiber has weak polarity and cannot adsorb the polysulfide is solved, and the stability of the battery is improved; on the other hand, using NiCo 2 O 4 The advantages of many contact sites of the metal nano-sheet and strong electron conductivity are achieved, the electron conduction is accelerated, the reaction speed of electrochemical reaction in the battery is improved, and the rate capability and the capacity of the battery are improved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a composite current collector of a high-performance lithium-sulfur battery comprises the following steps:
step 1: adding a nickel source, a cobalt source and a reaction additive into deionized water, and performing ultrasonic mixing to obtain a solution A;
step 2: soaking the 3D current collector in a mixed solution B of concentrated sulfuric acid and hydrogen peroxide, and washing with deionized water after ultrasonic treatment to obtain a cleaned 3D current collector;
and 3, step 3: putting the cleaned 3D current collector and the solution A into a reaction container together, heating in an oil bath at the temperature of 140-150 ℃ for 5-6 h for reaction to generate NiCo 2 OH；
And 4, step 4: and after the reaction is finished, taking out the 3D current collector, washing, drying in vacuum to remove moisture, then placing the current collector in a muffle furnace at 400-500 ℃, sintering for 3-4 h in air atmosphere, and naturally cooling to obtain the composite current collector.
Further, in the step 1, the nickel source is nickel nitrate hexahydrate or nickel sulfate hexahydrate or the like, the cobalt source is cobalt nitrate hexahydrate or cobalt chloride hexahydrate or the like, and the reaction additive is hexamethylenetetramine and sodium citrate dihydrate or hexamethylenetetramine and ascorbic acid or the like.
Further, the mass of the nickel source in the step 1 is 170-180 mg, the mass of the cobalt source is 340-360 mg, and the mass of the reaction additive is 200-300 mg.
Further, the 3D current collector in the step 2 is a current collector with a large number of net-shaped spaces, specifically carbon cloth, foamed nickel and the like, and the volume ratio of concentrated sulfuric acid to hydrogen peroxide in the mixed solution B is (3-1): 1.
further, the specific conditions of the vacuum drying in the step 4 are as follows: and (3) drying for 1-2 h in vacuum at 40-60 ℃.
A preparation method of a high-performance lithium-sulfur battery comprises the following steps:
step 1: cutting the composite current collector to a size of 0.5-1 cm 2 ；
And 2, step: dissolving sulfur powder (S) in carbon disulfide (CS) 2 ) Obtaining a solution C in the solution;
and 3, step 3: soaking the cut composite current collector in the solution C for 5-8 min, then taking out the current collector, placing the current collector in an oven for drying for 1-3 h, and removing redundant CS 2 Taking out the current collector after the surface of the current collector is covered with white crystalline sulfur particles;
and 4, step 4: flatly paving the current collector treated in the step 3 in a hydrothermal reaction kettle, preserving heat for 8-15 hours at 150-200 ℃, and naturally cooling after white crystalline sulfur particles on the current collector are uniformly melted to prepare the lithium-sulfur battery anode;
and 5: and (5) assembling the battery by using the positive electrode in the step 4.
Further, the concentration of the sulfur powder in the solution C in the step 2 is 0.3-0.5 g/ml.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the current collector prepared by the invention is NiCo 2 O 4 The oxide metal nanosheets grow on the 3D carbon fiber current collector, and the structure can adsorb polysulfide generated in battery reaction and accelerate ion conduction; through the modification of the 3D current collector, the electricity is obviously improvedCompared with the traditional current collector, the capacity and performance of the battery are improved by 70% in unit capacity and 100% in cycle stability, and the lithium-sulfur battery prepared on the basis of the current collector has higher rate performance and capacity.
Drawings
FIG. 1 is a schematic representation of CC @ NiCo prepared in accordance with example 1 of the present invention 2 O 4 SEM image of composite current collector.
FIG. 2 is a schematic representation of CC @ NiCo prepared in accordance with example 1 of the present invention 2 O 4 NiCo on the surface of composite collector 2 O 4 SEM image of (d).
FIG. 3 is a schematic representation of CC @ NiCo prepared in accordance with example 1 of the present invention 2 O 4 XRD pattern of composite current collector material.
FIG. 4 is a schematic representation of CC @ NiCo produced in example 1 of the present invention 2 O 4 The composite current collector is used to assemble a cycle performance map for a lithium sulfur battery.
FIG. 5 shows CC @ NiCo obtained in example 1 of the present invention 2 O 4 The composite current collector is used for assembling a performance diagram of the lithium-sulfur battery under different charging and discharging currents.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
Example 1
A preparation method of a composite current collector of a high-performance lithium-sulfur battery comprises the following steps:
step 1: 175mg of nickel nitrate hexahydrate (Ni (NO) 3 ) 2 ·6H 2 O), 350mg of cobalt nitrate hexahydrate (Co (NO) 3 ) 2 ·6H 2 O) was dissolved in 50ml of deionized water, stirred for 30min, and after it was completely dissolved, 211mg of hexamethylenetetramine and 88mg of sodium citrate dihydrate (Na) 3 C 6 H 5 O 7 .2H 2 O) adding Ni (NO) dissolved therein 3 ) 2 ·6H 2 O and Co (NO) 3 ) 2 ·6H 2 In the solution of O, performing ultrasonic treatment for 60min to completely dissolve all solid medicines, wherein the solution is purple, and finally obtaining a solution A;
step 2: 2 x 2cm 2 Soaking the carbon cloth in 50ml of mixed solution of concentrated sulfuric acid and hydrogen peroxide in a volume ratio of 1:1 for 30min, taking out and washing with deionized water for 3 times to remove oil stains and surface impurities;
and step 3: putting the cleaned carbon cloth and the solution A into a three-neck flask together, pouring the solution A, heating the solution A in a 150 ℃ condensing oil bath for 6 hours under the protection of argon to react to generate NiCo 2 OH；
And 4, step 4: after the reaction is finished, taking out the carbon cloth, washing the carbon cloth by using deionized water, and after the carbon cloth is washed by the deionized water to be colorless, drying the carbon cloth for 1 hour in vacuum at the temperature of 60 ℃ to remove redundant water; and taking out the dried carbon cloth, placing the carbon cloth in a muffle furnace at 500 ℃, sintering the carbon cloth in the air for 3h (the heating rate is 1 ℃/min), and naturally cooling the carbon cloth to prepare the composite current collector.
NiCo loaded on carbon cloth 2 O 4 The mass of (A) is about 0.3-0.4 mg/cm 2 。
A preparation method of a high-performance lithium-sulfur battery comprises the following steps:
step 1: cutting the composite current collector to 0.6cm 2 ；
And 2, step: 0.5g of sulphur powder was completely dissolved in 10ml of CS in a fume hood 2 Obtaining a solution C in the solution;
and 3, step 3: soaking the cut composite current collector in the solution C for 5min, taking out the current collector, and drying in a drying oven at 45 ℃ for 2h to remove redundant CS 2 Taking out the current collector after the surface of the current collector is covered with white crystalline sulfur particles;
and 4, step 4: flatly paving the current collector treated in the step 3 in a hydrothermal reaction kettle, preserving heat for 12 hours at 170 ℃, and naturally cooling after white crystalline sulfur particles loaded and on the current collector are uniformly melted to prepare the lithium-sulfur battery anode;
and 5: and (4) assembling the battery by using the positive electrode in the step 4.
The sulfur load of each positive electrode of the lithium-sulfur battery is about 1.2-1.8 mg/cm 2 。
Book blockCC @ NiCo prepared in examples 2 O 4 SEM images of the composite current collector are shown in fig. 1; ni Co on surface of composite current collector 2 O 4 As shown in FIG. 2; CC @ NiCo 2 O 4 The XRD pattern of the composite current collector material is shown in fig. 3; prepared CC @ NiCo 2 O 4 The cycle performance diagram of the composite current collector for assembling the lithium sulfur battery is shown in fig. 4; the performance plots for different charging and discharging currents are shown in fig. 5.
Example 2
A preparation method of a composite current collector of a high-performance lithium-sulfur battery comprises the following steps:
step 1: 180mg of nickel nitrate hexahydrate (Ni (NO) 3 ) 2 ·6H 2 O), 360mg of cobalt nitrate hexahydrate (Co (NO) 3 ) 2 ·6H 2 O) is dissolved in 50ml deionized water, stirred for 30min, and after the solution is completely dissolved, 200mg of hexamethylenetetramine and 35mg of sodium citrate dihydrate (Na) 3 C 6 H 5 O 7 .2H 2 O) adding Ni (NO) dissolved therein 3 ) 2 ·6H 2 O and Co (NO) 3 ) 2 ·6H 2 In the solution of O, ultrasonic treatment is carried out for 60min to completely dissolve all solid medicines, the solution is purple, and the solution A is finally obtained;
and 2, step: 2 x 2cm 2 Soaking the carbon cloth in 50ml of mixed solution of concentrated sulfuric acid and hydrogen peroxide in a volume ratio of 1:1 for 30min, taking out and washing with deionized water for 3 times to remove oil stains and surface impurities;
and step 3: putting the cleaned carbon cloth and the solution A into a three-mouth bottle together, pouring the solution A into the three-mouth bottle, heating the three-mouth bottle in a 150 ℃ condensing oil bath for 6 hours under the protection of argon to react to generate NiCo 2 OH；
And 4, step 4: after the reaction is finished, taking out the carbon cloth, washing the carbon cloth by using deionized water, and after the carbon cloth is washed by the deionized water to be colorless, drying the carbon cloth for 1 hour in vacuum at the temperature of 60 ℃ to remove redundant water; and taking out the dried carbon cloth, placing the carbon cloth in a 400 ℃ muffle furnace, sintering the carbon cloth in the air for 4h (the heating rate is 1 ℃/min), and naturally cooling the carbon cloth to obtain the composite current collector.
Example 3
A preparation method of a high-performance lithium-sulfur battery composite current collector comprises the following steps:
step 1: 170mg of nickel nitrate hexahydrate (Ni (NO) 3 ) 2 ·6H 2 O), 340mg of cobalt nitrate hexahydrate (Co (NO) 3 ) 2 ·6H 2 O) is dissolved in 50ml deionized water, stirred for 30min, after complete dissolution, 220mg of hexamethylenetetramine and 65mg of sodium citrate dihydrate (Na) are added 3 C 6 H 5 O 7 .2H 2 O) adding Ni (NO) dissolved therein 3 ) 2 ·6H 2 O and Co (NO) 3 ) 2 ·6H 2 In the solution of O, performing ultrasonic treatment for 60min to completely dissolve all solid medicines, wherein the solution is purple, and finally obtaining a solution A;
step 2: 2 x 2cm 2 Soaking the carbon cloth in 50ml of mixed solution of concentrated sulfuric acid and hydrogen peroxide in a volume ratio of 1:1 for 30min, taking out and washing with deionized water for 3 times to remove oil stains and surface impurities;
and 3, step 3: putting the cleaned carbon cloth and the solution A into a three-mouth bottle together, pouring the solution A into the three-mouth bottle, heating the three-mouth bottle in a 150 ℃ condensing oil bath for 6 hours under the protection of argon to react to generate NiCo 2 OH；
And 4, step 4: after the reaction is finished, taking out the carbon cloth, washing the carbon cloth by using deionized water, and after the carbon cloth is washed by the deionized water to be colorless, drying the carbon cloth for 1 hour in vacuum at the temperature of 60 ℃ to remove redundant water; and taking out the dried carbon cloth, placing the carbon cloth in a muffle furnace at 450 ℃, sintering the carbon cloth in the air for 4h (the heating rate is 1 ℃/min), and naturally cooling to prepare the composite current collector.
A preparation method of a high-performance lithium-sulfur battery comprises the following steps:
step 1: cutting the composite current collector to 0.6cm 2 ；
And 2, step: 0.3g of sulphur powder was completely dissolved in 10ml of CS in a fume hood 2 Obtaining a solution C in the solution;
and step 3: soaking the cut composite current collector in the solution C for 5min, taking out the current collector, and drying in a drying oven at 45 ℃ for 2h for removingRemoving excess CS 2 Taking out the current collector after the surface of the current collector is covered with white crystalline sulfur particles;
and 4, step 4: flatly paving the current collector treated in the step 3 in a hydrothermal reaction kettle, preserving heat for 12 hours at 170 ℃, and naturally cooling after white crystalline sulfur particles loaded and on the current collector are uniformly melted to prepare the lithium-sulfur battery anode;
and 5: and (5) assembling the battery by using the positive electrode in the step 4.
As can be seen from FIG. 1, the nano-NiCo flakes obtained in example 1 2 O 4 Uniformly covering the surface of the carbon fiber, and compared with the traditional carbon nano fiber, the sulfur is in NiCo 2 O 4 The surface has more contact sites and load points, with polar NiCo 2 O 4 The nano sheet can effectively adsorb polysulfide in the reaction process of the battery, and the polysulfide is prevented from dissolving, so that the cycling stability of the battery is improved. As can be seen from FIG. 2, NiCo 2 O 4 The structure is of a sheet structure and grows on the surface of the substrate, so that the contact area is increased.
As can be seen from FIG. 3, the material grown on the surface of the substrate is NiCo 2 O 4 The peak positions (220) and (311) are consistent with the peak positions of the PDF cards 02-1074.
As can be seen from FIG. 4, the formula CC @ NiCo 2 O 4 The lithium-sulfur battery prepared with the/S cathode material has an initial capacity of 670mAh/g, still maintains 90% of the initial capacity after 200 cycles, and the coulombic efficiency is close to one hundred percent.
As can be seen from FIG. 5, NiCo 2 O 4 The battery can be stably circulated, and has good circulation stability under various current conditions (0.2C, 0.5C, 1C and 2C); furthermore, even under the condition of large current (2C), the capacity of the capacitor still has considerable capacity of 400 mAh/g.
Where mentioned above are merely embodiments of the invention, any feature disclosed in this specification may, unless stated otherwise, be replaced by alternative features serving equivalent or similar purposes; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.

Claims (7)

1. The preparation method of the composite current collector of the high-performance lithium-sulfur battery is characterized by comprising the following steps of:
step 1: adding a nickel source, a cobalt source and a reaction additive into deionized water, and performing ultrasonic mixing to obtain a solution A;
and 2, step: soaking the 3D current collector in a mixed solution B of concentrated sulfuric acid and hydrogen peroxide, and washing with deionized water after ultrasonic treatment to obtain a cleaned 3D current collector;
and 3, step 3: putting the cleaned 3D current collector and the solution A together in a reaction container, and reacting in an oil bath at the temperature of 140-150 ℃ for 5-6 h;
and 4, step 4: after the reaction is finished, taking out the 3D current collector, washing, drying in vacuum to remove moisture, then placing the current collector in a muffle furnace at 400-500 ℃, sintering for 3-4 h in air atmosphere, and naturally cooling to obtain the composite current collector; the composite current collector is NiCo 2 O 4 Oxide metal nanoplates are grown on the 3D current collector.
2. The method for preparing the composite current collector of the high-performance lithium-sulfur battery as claimed in claim 1, wherein the nickel source in step 1 is nickel nitrate hexahydrate or nickel sulfate hexahydrate, the cobalt source is cobalt nitrate hexahydrate or cobalt chloride hexahydrate, and the reaction additive is a mixture of hexamethylene tetramine and sodium citrate dihydrate or a mixture of hexamethylene tetramine and ascorbic acid.
3. The method for preparing the composite current collector of the high-performance lithium-sulfur battery according to claim 1, wherein the mass of the nickel source in the step 1 is 170-180 mg, the mass of the cobalt source is 340-360 mg, and the mass of the reaction additive is 200-300 mg.
4. The method for preparing the composite current collector of the high-performance lithium-sulfur battery according to claim 1, wherein the 3D current collector in the step 2 is a current collector with a mesh-shaped space, specifically carbon cloth or nickel foam; the volume ratio of the concentrated sulfuric acid to the hydrogen peroxide in the mixed solution B is (3-1): 1.
5. the method for preparing the composite current collector of the high-performance lithium-sulfur battery as claimed in claim 1, wherein the specific conditions of the vacuum drying in the step 4 are as follows: and (3) drying for 1-2 h in vacuum at 40-60 ℃.
6. A method for preparing a high-performance lithium-sulfur battery based on the composite current collector obtained by the method of any one of claims 1 to 5, is characterized by comprising the following steps:
step 1: cutting the composite current collector to a size of 0.5-1 cm 2 ；
Step 2: dissolving sulfur powder in a carbon disulfide solution to obtain a solution C;
and step 3: soaking the cut composite current collector in the solution C for 5-8 min, then taking out the current collector, placing the current collector in an oven for drying for 1-3 h, and taking out the current collector after white crystal-shaped sulfur particles cover the surface of the current collector;
and 4, step 4: flatly paving the current collector treated in the step 3 in a hydrothermal reaction kettle, preserving heat for 8-15 hours at the temperature of 150-200 ℃, and naturally cooling after white crystalline sulfur particles on the current collector are uniformly melted to obtain the lithium-sulfur battery anode;
and 5: and (5) assembling the battery by using the positive electrode in the step 4.
7. The method for preparing a high-performance lithium-sulfur battery according to claim 6, wherein the concentration of the sulfur powder in the solution C in the step 2 is 0.3-0.5 g/ml.
CN201910574538.6A 2019-06-28 2019-06-28 Preparation method and application of high-performance composite current collector of lithium-sulfur battery Active CN110165222B (en)

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