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Sulfenyl anode of lithium-sulfur rechargeable battery and preparation method thereof

A lithium-sulfur battery, sulfur-based technology, applied in the direction of secondary batteries, electrode manufacturing, active material electrodes, etc., can solve the problems of unsatisfactory electrode cycle stability, achieve good cycle stability, improve cycle performance, and prevent electrode self-discharge The effect of discharge

Inactive Publication Date: 2011-08-31
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gelatin has achieved good results as a binder for the positive electrode of lithium-sulfur batteries, but the cycle stability of the electrode is still not ideal, and the specific capacity retention rate after 20 cycles is only 43%.

Method used

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  • Sulfenyl anode of lithium-sulfur rechargeable battery and preparation method thereof
  • Sulfenyl anode of lithium-sulfur rechargeable battery and preparation method thereof
  • Sulfenyl anode of lithium-sulfur rechargeable battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of sulfur-based composite active materials for secondary lithium-sulfur batteries:

[0033] Mix 0.1g of carbon nanotubes, 6g of elemental sulfur and 1g of polyacrylonitrile, add 0.2g of absolute ethanol as a dispersant, place in an agate ball mill jar equipped with an O-ring, put in agate beads, and start ball milling. The speed of the high-energy ball mill is 250 rpm, and the ball milling time is 2 hours to obtain a uniformly dispersed carbon nanotube / elemental sulfur / polyacrylonitrile mixture; the mixture is transferred from the agate ball mill jar to a quartz boat, and vacuum-dried at 80°C After 2 hours, the dispersant absolute ethanol was removed to obtain a dry carbon nanotube / elemental sulfur / polyacrylonitrile mixture of about 6.83g; the quartz boat with the dry mixture was put into a clean quartz tube, Under the protection of an inert gas, it was kept at 320° C. for 7 hours to obtain 1.74 g of sulfur-based composite active material.

[0034] figure ...

Embodiment 2

[0037] The sulfur-based composite active material for the secondary lithium-sulfur battery obtained in Example 1 is used as the active material, the binder is β-cyclodextrin, and the carbon conductive agent is Super P carbon black. Put 10mg of β-cyclodextrin and 3mL of distilled water in a mixing cup, heat to 40°C to dissolve the β-cyclodextrin in water to form a colorless solution, then add 10mg of Super P into the mixing cup Carbon black conductive agent and 80mg of sulfur-based composite active material, followed by ultrasonic treatment for 30 minutes, the ultrasonic frequency is 100kHz, then heat preservation at 40°C and magnetic stirring for 3 hours, coat the uniformly mixed slurry on aluminum foil, and vacuum dry at 80°C After 2 hours, after tableting under a pressure of 2 MPa, a sulfur-based positive electrode of a secondary lithium-sulfur battery with β-cyclodextrin as a binder was obtained.

[0038] The prepared sulfur-based positive electrode was punched into pole...

Embodiment 3

[0042] The sulfur-based composite active material for the secondary lithium-sulfur battery obtained in Example 1 is used as the active material, the binder is β-cyclodextrin, and the carbon conductive agent is Super P carbon black. Put 8mg of β-cyclodextrin and 3mL of distilled water in a mixing cup, heat to 40°C to dissolve the β-cyclodextrin in water to form a colorless solution, then add 8mg of Super P into the mixing cup Carbon black conductive agent and 84mg of sulfur-based composite active material, followed by ultrasonic treatment for 30 minutes, the ultrasonic frequency is 100kHz, then kept at 40°C and magnetically stirred for 4 hours, and the obtained uniformly mixed slurry was coated on the aluminum foil, at 80°C After vacuum drying for 2 hours and tableting under a pressure of 2 MPa, a sulfur-based positive electrode for a secondary lithium-sulfur battery with β-cyclodextrin as a binder was obtained.

[0043] The prepared sulfur-based positive electrode was punch...

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Abstract

The invention discloses sulfenyl anode of a lithium-sulfur rechargeable battery and a preparation method thereof. The sulfenyl anode is prepared by the steps of: equally mixing sulfenyl compound active material, cyclodextrin binder and carbon conductivity agent, coating the mixture on an aluminum foil current collector and obtaining the sulfenyl anode after drying and pressing. The coating thickness is 50 to 100 microns and the aluminum foil thickness is 20 to 30 microns; the mass ratio of the sulfenyl compound active material, the cyclodextrin binder and the carbon conductivity agent is 7 to8:0.6 to 1:0.6 to 1.5, wherein the sulfenyl compound active material is formed by the steps of: equally mixing carbon nano tube, sulfur and polyacrylonitrile according to the mass ratio of 0.1 to 0.2:6 to 8:1 and sintering the mixture in protection of inert gas at the temperature of 300 to 320 DEG C for insulation for 6 to 8 hours. By using the lithium-sulfur rechargeable battery with the sulfenylanode and lithium metal cathode, the reversible capacity of the sulfenyl compound active material reaches 680mAh.g<-1> under 0.1C multiplying power charge-discharge condition; and compared with the discharge capacity of second circulation, the discharge capacity after 100 times of circulation decreases less than 10 percent.

Description

technical field [0001] The invention relates to a battery electrode and a preparation method thereof, in particular to a sulfur-based positive electrode for a secondary lithium-sulfur battery and a preparation method thereof. Background technique [0002] The positive electrode of a secondary lithium battery is mainly composed of three parts, which are active material, binder and conductive agent. Currently commercialized active materials are mainly layered or spinel-structured lithium transition metal oxides (such as lithium cobaltate, lithium manganate) and olivine-structured lithium iron phosphate. Lithium cobalt oxide (LiCoO 2 ) has a relatively large theoretical capacity of 275mAh g -1 , but its price is high, it has certain toxicity, and the material is prone to exothermic decomposition reaction when overcharged, on the one hand, the actual capacity of the material is lower than 200mAh·g -1 , On the other hand, it also poses a threat to battery safety. Lithium mang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/04H01M10/36
CPCY02E60/12Y02E60/10
Inventor 杨军伍英蕾
Owner SHANGHAI JIAOTONG UNIV
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